/system/database/DB_driver.php

.htaccess
LICENSE
PHPMailer
    .gitignore
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    class.phpmailer.php
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    composer.json
    docs
        Callback_function_notes.txt
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        extending.html
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        pop3_article.txt
    examples
        code_generator.phps
        contents.html
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        gmail.phps
        images
            phpmailer.png
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        index.html
        mail.phps
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        scripts
            XRegExp.js
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            shBrushPhp.js
            shCore.js
            shLegacy.js
        send_file_upload.phps
        sendmail.phps
        smtp.phps
        smtp_check.phps
        smtp_no_auth.phps
        ssl_options.phps
        styles
            shCore.css
            shCoreDefault.css
            shCoreDjango.css
            shCoreEclipse.css
            shCoreEmacs.css
            shCoreFadeToGrey.css
            shCoreMDUltra.css
            shCoreMidnight.css
            shCoreRDark.css
            shThemeAppleScript.css
            shThemeDefault.css
            shThemeDjango.css
            shThemeEclipse.css
            shThemeEmacs.css
            shThemeFadeToGrey.css
            shThemeMDUltra.css
            shThemeMidnight.css
            shThemeRDark.css
            shThemeVisualStudio.css
            wrapping.png
    extras
        EasyPeasyICS.php
        README.md
        htmlfilter.php
        ntlm_sasl_client.php
    language
        phpmailer.lang-am.php
        phpmailer.lang-ar.php
        phpmailer.lang-az.php
        phpmailer.lang-be.php
        phpmailer.lang-bg.php
        phpmailer.lang-br.php
        phpmailer.lang-ca.php
        phpmailer.lang-ch.php
        phpmailer.lang-cz.php
        phpmailer.lang-de.php
        phpmailer.lang-dk.php
        phpmailer.lang-el.php
        phpmailer.lang-eo.php
        phpmailer.lang-es.php
        phpmailer.lang-et.php
        phpmailer.lang-fa.php
        phpmailer.lang-fi.php
        phpmailer.lang-fo.php
        phpmailer.lang-fr.php
        phpmailer.lang-gl.php
        phpmailer.lang-he.php
        phpmailer.lang-hr.php
        phpmailer.lang-hu.php
        phpmailer.lang-id.php
        phpmailer.lang-it.php
        phpmailer.lang-ja.php
        phpmailer.lang-ka.php
        phpmailer.lang-ko.php
        phpmailer.lang-lt.php
        phpmailer.lang-lv.php
        phpmailer.lang-ms.php
        phpmailer.lang-nl.php
        phpmailer.lang-no.php
        phpmailer.lang-pl.php
        phpmailer.lang-pt.php
        phpmailer.lang-ro.php
        phpmailer.lang-ru.php
        phpmailer.lang-se.php
        phpmailer.lang-sk.php
        phpmailer.lang-sl.php
        phpmailer.lang-sr.php
        phpmailer.lang-tr.php
        phpmailer.lang-uk.php
        phpmailer.lang-vi.php
        phpmailer.lang-zh.php
        phpmailer.lang-zh_cn.php
    test
        bootstrap.php
        fakepopserver.sh
        fakesendmail.sh
        phpmailerLangTest.php
        phpmailerTest.php
        runfakepopserver.sh
        test_callback.php
        testbootstrap-dist.php
    travis.phpunit.xml.dist
application
    .htaccess
    cache
        .htaccess
        index.html
    config
        autoload.php
        config.php
        constants.php
        database.php
        doctypes.php
        foreign_chars.php
        hooks.php
        index.html
        memcached.php
        migration.php
        mimes.php
        profiler.php
        routes.php
        smileys.php
        user_agents.php
    controllers
        Ioattachment.php
        Ioexport.php
        Iogroups.php
        Ioimport.php
        Iomessages.php
        Iosendmanager.php
        Iosends.php
        Iosignatures.php
        Iotimetable.php
        Mailing.php
        Welcome.php
        index.html
    core
        index.html
    helpers
        index.html
    hooks
        index.html
    index.html
    language
        arabic
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        azerbaijani
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        bulgarian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        catalan
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        czech
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        dutch
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        english
            index.html
            mailerattach_lang.php
            mailerexport_lang.php
            mailergroup_lang.php
            mailerimport_lang.php
            mailermailing_lang.php
            mailermain_lang.php
            mailermsg_lang.php
            mailersendmanager_lang.php
            mailersends_lang.php
            mailersignatures_lang.php
            mailertimetable_lang.php
        filipino
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        french
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        german
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        gujarati
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        hindi
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        hungarian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        index.html
        indonesian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        italian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        japanese
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        khmer
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        korean
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        latvian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        norwegian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        persian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        polish
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            mailerattach_lang.php
            mailerexport_lang.php
            mailergroup_lang.php
            mailerimport_lang.php
            mailerinstall_lang.php
            mailermailing_lang.php
            mailermain_lang.php
            mailermsg_lang.php
            mailersendmanager_lang.php
            mailersends_lang.php
            mailersignatures_lang.php
            mailertimetable_lang.php
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        portuguese
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        portuguese-brazilian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        romanian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        russian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        simplified-chinese
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        slovak
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        spanish
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        swedish
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        tamil
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        thai
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        traditional-chinese
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        turkish
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        ukrainian
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        urdu
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        vietnamese
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
    libraries
        index.html
    logs
        index.html
    models
        Attachment_model.php
        Export_model.php
        Groups_model.php
        Import_model.php
        Mailing_model.php
        Messages_model.php
        Sendmanager_model.php
        Sends_model.php
        Signatures_model.php
        System_model.php
        Timetable_model.php
        Track_model.php
        User_model.php
        index.html
    third_party
        index.html
    views
        about.php
        aboutrights.php
        addnewuser.php
        attachment
            attachment.php
        changepassword.php
        changeprofiledata.php
        errors
            cli
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            html
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            index.html
        export
            group.php
        foot.php
        footpop.php
        generatenewpassword.php
        generatepassword.php
        groups
            addemail.php
            edit.php
            editemail.php
            excaddemail.php
            exclusion.php
            export.php
            import.php
            index.php
            viewgroup.php
        head.php
        headpop.php
        import
            group.php
            groupimport.php
        index.html
        licensefail.php
        login.php
        logindenied.php
        logs.php
        mainpage.php
        messages
            editmessage.php
            empty.php
            index.php
            reportmessage.php
            statmessage.php
        norights.php
        options.php
        sendmanager
            sender.php
        sends
            edit.php
            index.php
        signatures
            edit.php
            index.php
        team.php
        timetable
            edit.php
            index.php
        welcome_message.php
arial.ttf
attachment
captcha
    sys.txt
favicon.ico
import
index.php
install.php
library
    add.png
    ckeditor
        CHANGES.md
        LICENSE.md
        README.md
        adapters
            jquery.js
        build-config.js
        ckeditor.js
        config.js
        contents.css
        lang
            af.js
            ar.js
            bg.js
            bn.js
            bs.js
            ca.js
            cs.js
            cy.js
            da.js
            de.js
            el.js
            en-au.js
            en-ca.js
            en-gb.js
            en.js
            eo.js
            es.js
            et.js
            eu.js
            fa.js
            fi.js
            fo.js
            fr-ca.js
            fr.js
            gl.js
            gu.js
            he.js
            hi.js
            hr.js
            hu.js
            id.js
            is.js
            it.js
            ja.js
            ka.js
            km.js
            ko.js
            ku.js
            lt.js
            lv.js
            mk.js
            mn.js
            ms.js
            nb.js
            nl.js
            no.js
            pl.js
            pt-br.js
            pt.js
            ro.js
            ru.js
            si.js
            sk.js
            sl.js
            sq.js
            sr-latn.js
            sr.js
            sv.js
            th.js
            tr.js
            tt.js
            ug.js
            uk.js
            vi.js
            zh-cn.js
            zh.js
        plugins
            a11yhelp
                dialogs
                    a11yhelp.js
                    lang
                        _translationstatus.txt
                        af.js
                        ar.js
                        bg.js
                        ca.js
                        cs.js
                        cy.js
                        da.js
                        de.js
                        el.js
                        en-gb.js
                        en.js
                        eo.js
                        es.js
                        et.js
                        fa.js
                        fi.js
                        fo.js
                        fr-ca.js
                        fr.js
                        gl.js
                        gu.js
                        he.js
                        hi.js
                        hr.js
                        hu.js
                        id.js
                        it.js
                        ja.js
                        km.js
                        ko.js
                        ku.js
                        lt.js
                        lv.js
                        mk.js
                        mn.js
                        nb.js
                        nl.js
                        no.js
                        pl.js
                        pt-br.js
                        pt.js
                        ro.js
                        ru.js
                        si.js
                        sk.js
                        sl.js
                        sq.js
                        sr-latn.js
                        sr.js
                        sv.js
                        th.js
                        tr.js
                        tt.js
                        ug.js
                        uk.js
                        vi.js
                        zh-cn.js
                        zh.js
            about
                dialogs
                    about.js
                    hidpi
                        logo_ckeditor.png
                    logo_ckeditor.png
            clipboard
                dialogs
                    paste.js
            colordialog
                dialogs
                    colordialog.js
            dialog
                dialogDefinition.js
            div
                dialogs
                    div.js
            find
                dialogs
                    find.js
            flash
                dialogs
                    flash.js
                images
                    placeholder.png
            forms
                dialogs
                    button.js
                    checkbox.js
                    form.js
                    hiddenfield.js
                    radio.js
                    select.js
                    textarea.js
                    textfield.js
                images
                    hiddenfield.gif
            icons.png
            icons_hidpi.png
            iframe
                dialogs
                    iframe.js
                images
                    placeholder.png
            image
                dialogs
                    image.js
                images
                    noimage.png
            link
                dialogs
                    anchor.js
                    link.js
                images
                    anchor.png
                    hidpi
                        anchor.png
            liststyle
                dialogs
                    liststyle.js
            magicline
                images
                    hidpi
                        icon-rtl.png
                        icon.png
                    icon-rtl.png
                    icon.png
            pagebreak
                images
                    pagebreak.gif
            pastefromword
                filter
                    default.js
            preview
                preview.html
            scayt
                LICENSE.md
                README.md
                dialogs
                    options.js
                    toolbar.css
            showblocks
                images
                    block_address.png
                    block_blockquote.png
                    block_div.png
                    block_h1.png
                    block_h2.png
                    block_h3.png
                    block_h4.png
                    block_h5.png
                    block_h6.png
                    block_p.png
                    block_pre.png
            smiley
                dialogs
                    smiley.js
                images
                    angel_smile.gif
                    angel_smile.png
                    angry_smile.gif
                    angry_smile.png
                    broken_heart.gif
                    broken_heart.png
                    confused_smile.gif
                    confused_smile.png
                    cry_smile.gif
                    cry_smile.png
                    devil_smile.gif
                    devil_smile.png
                    embaressed_smile.gif
                    embarrassed_smile.gif
                    embarrassed_smile.png
                    envelope.gif
                    envelope.png
                    heart.gif
                    heart.png
                    kiss.gif
                    kiss.png
                    lightbulb.gif
                    lightbulb.png
                    omg_smile.gif
                    omg_smile.png
                    regular_smile.gif
                    regular_smile.png
                    sad_smile.gif
                    sad_smile.png
                    shades_smile.gif
                    shades_smile.png
                    teeth_smile.gif
                    teeth_smile.png
                    thumbs_down.gif
                    thumbs_down.png
                    thumbs_up.gif
                    thumbs_up.png
                    tongue_smile.gif
                    tongue_smile.png
                    tounge_smile.gif
                    whatchutalkingabout_smile.gif
                    whatchutalkingabout_smile.png
                    wink_smile.gif
                    wink_smile.png
            specialchar
                dialogs
                    lang
                        _translationstatus.txt
                        af.js
                        ar.js
                        bg.js
                        ca.js
                        cs.js
                        cy.js
                        da.js
                        de.js
                        el.js
                        en-gb.js
                        en.js
                        eo.js
                        es.js
                        et.js
                        fa.js
                        fi.js
                        fr-ca.js
                        fr.js
                        gl.js
                        he.js
                        hr.js
                        hu.js
                        id.js
                        it.js
                        ja.js
                        km.js
                        ko.js
                        ku.js
                        lt.js
                        lv.js
                        nb.js
                        nl.js
                        no.js
                        pl.js
                        pt-br.js
                        pt.js
                        ru.js
                        si.js
                        sk.js
                        sl.js
                        sq.js
                        sv.js
                        th.js
                        tr.js
                        tt.js
                        ug.js
                        uk.js
                        vi.js
                        zh-cn.js
                        zh.js
                    specialchar.js
            strinsert
                plugin.js
            table
                dialogs
                    table.js
            tabletools
                dialogs
                    tableCell.js
            templates
                dialogs
                    templates.css
                    templates.js
                templates
                    default.js
                    images
                        template1.gif
                        template2.gif
                        template3.gif
            wsc
                LICENSE.md
                README.md
                dialogs
                    ciframe.html
                    tmpFrameset.html
                    wsc.css
                    wsc.js
                    wsc_ie.js
        samples
            css
                samples.css
            img
                github-top.png
                header-bg.png
                header-separator.png
                logo.png
                navigation-tip.png
            index.html
            js
                sample.js
                sf.js
            old
                ajax.html
                api.html
                appendto.html
                assets
                    inlineall
                        logo.png
                    outputxhtml
                        outputxhtml.css
                    posteddata.php
                    sample.jpg
                    uilanguages
                        languages.js
                datafiltering.html
                dialog
                    assets
                        my_dialog.js
                    dialog.html
                divreplace.html
                enterkey
                    enterkey.html
                htmlwriter
                    assets
                        outputforflash
                            outputforflash.fla
                            outputforflash.swf
                            swfobject.js
                    outputforflash.html
                    outputhtml.html
                index.html
                inlineall.html
                inlinebycode.html
                inlinetextarea.html
                jquery.html
                magicline
                    magicline.html
                readonly.html
                replacebyclass.html
                replacebycode.html
                sample.css
                sample.js
                sample_posteddata.php
                tabindex.html
                toolbar
                    toolbar.html
                uicolor.html
                uilanguages.html
                wysiwygarea
                    fullpage.html
                xhtmlstyle.html
            toolbarconfigurator
                css
                    fontello.css
                font
                    LICENSE.txt
                    config.json
                    fontello.eot
                    fontello.svg
                    fontello.ttf
                    fontello.woff
                index.html
                js
                    abstracttoolbarmodifier.js
                    fulltoolbareditor.js
                    toolbarmodifier.js
                    toolbartextmodifier.js
                lib
                    codemirror
                        LICENSE
                        codemirror.css
                        codemirror.js
                        javascript.js
                        neo.css
                        show-hint.css
                        show-hint.js
        skins
            moono
                dialog.css
                dialog_ie.css
                dialog_ie7.css
                dialog_ie8.css
                dialog_iequirks.css
                editor.css
                editor_gecko.css
                editor_ie.css
                editor_ie7.css
                editor_ie8.css
                editor_iequirks.css
                icons.png
                icons_hidpi.png
                images
                    arrow.png
                    close.png
                    hidpi
                        close.png
                        lock-open.png
                        lock.png
                        refresh.png
                    lock-open.png
                    lock.png
                    refresh.png
                    spinner.gif
                readme.md
            office2013
                dialog.css
                editor.css
                icons.png
                icons_hidpi.png
                images
                    arrow.png
                    close.png
                    hidpi
                        close.png
                        lock-open.png
                        lock.png
                        refresh.png
                    lock-open.png
                    lock.png
                    refresh.png
                skin.js
        styles.js
    crop
        Canvas.php
        Coordinate.php
        Exception.php
        Font
            GDF.php
            PS.php
            TTF.php
        Image.php
        Mapper
            BMP.php
            GD.php
            GD2.php
            GIF.php
            JPEG.php
            PNG.php
            TGA.php
        MapperFactory.php
        Operation
            AddNoise.php
            ApplyConvolution.php
            ApplyFilter.php
            ApplyMask.php
            AsGrayscale.php
            AsNegative.php
            AutoCrop.php
            CopyChannelsPalette.php
            CopyChannelsTrueColor.php
            CorrectGamma.php
            Crop.php
            Flip.php
            GetMask.php
            Merge.php
            Mirror.php
            Resize.php
            ResizeCanvas.php
            Rotate.php
            RoundCorners.php
            Unsharp.php
        OperationFactory.php
        PaletteImage.php
        README
        TrueColorImage.php
        VERSION
        WideImage.php
        gpl.txt
        lgpl.txt
        vendor
            de77
                BMP.php
                TGA.php
    datetimepicker-master
        .gitignore
        MIT-LICENSE.txt
        README.md
        bower.json
        datetimepicker.jquery.json
        index.html
        jquery.datetimepicker.css
        jquery.datetimepicker.js
        jquery.js
        package.json
        screen
            1.png
            2.png
            3.1.png
            3.png
            4.png
            5.png
            6.png
    delete.png
    edit.png
    emailadd.png
    emailedit.png
    export.png
    filemanager
        LICENSE.TXT
        README.md
        changelog.txt
        filemanager
            ajax_calls.php
            config
                .htaccess
                config.php
            css
                style.css
            dialog.php
            execute.php
            force_download.php
            img
                clipboard_apply.png
                clipboard_clear.png
                copy.png
                cut.png
                date.png
                dimension.png
                down.png
                download.png
                duplicate.png
                edit_img.png
                file_edit.png
                glyphicons-halflings-white.png
                glyphicons-halflings.png
                ico
                    ac3.jpg
                    accdb.jpg
                    ade.jpg
                    adp.jpg
                    ai.jpg
                    aiff.jpg
                    avi.jpg
                    bmp.jpg
                    css.jpg
                    csv.jpg
                    default.jpg
                    dmg.jpg
                    doc.jpg
                    docx.jpg
                    favicon.ico
                    fla.jpg
                    flv.jpg
                    folder.png
                    folder_back.png
                    gif.jpg
                    gz.jpg
                    html.jpg
                    iso.jpg
                    jpeg.jpg
                    jpg.jpg
                    log.jpg
                    m4a.jpg
                    mdb.jpg
                    mid.jpg
                    mov.jpg
                    mp3.jpg
                    mp4.jpg
                    mpeg.jpg
                    mpg.jpg
                    odb.jpg
                    odf.jpg
                    odg.jpg
                    odp.jpg
                    ods.jpg
                    odt.jpg
                    ogg.jpg
                    otg.jpg
                    otp.jpg
                    ots.jpg
                    ott.jpg
                    pdf.jpg
                    png.jpg
                    ppt.jpg
                    pptx.jpg
                    psd.jpg
                    rar.jpg
                    rtf.jpg
                    sql.jpg
                    svg.jpg
                    tar.jpg
                    tiff.jpg
                    txt.jpg
                    wav.jpg
                    webm.jpg
                    wma.jpg
                    xhtml.jpg
                    xls.jpg
                    xlsx.jpg
                    xml.jpg
                    zip.jpg
                ico_dark
                    ac3.jpg
                    accdb.jpg
                    ade.jpg
                    adp.jpg
                    ai.jpg
                    aiff.jpg
                    avi.jpg
                    bmp.jpg
                    css.jpg
                    csv.jpg
                    default.jpg
                    dmg.jpg
                    doc.jpg
                    docx.jpg
                    favicon.ico
                    fla.jpg
                    flv.jpg
                    folder.png
                    folder_back.png
                    gif.jpg
                    gz.jpg
                    html.jpg
                    iso.jpg
                    jpeg.jpg
                    jpg.jpg
                    log.jpg
                    m4a.jpg
                    mdb.jpg
                    mid.jpg
                    mov.jpg
                    mp3.jpg
                    mp4.jpg
                    mpeg.jpg
                    mpg.jpg
                    odb.jpg
                    odf.jpg
                    odg.jpg
                    odp.jpg
                    ods.jpg
                    odt.jpg
                    ogg.jpg
                    otg.jpg
                    otp.jpg
                    ots.jpg
                    ott.jpg
                    pdf.jpg
                    png.jpg
                    ppt.jpg
                    pptx.jpg
                    psd.jpg
                    rar.jpg
                    rtf.jpg
                    sql.jpg
                    svg.jpg
                    tar.jpg
                    tiff.jpg
                    txt.jpg
                    wav.jpg
                    webm.jpg
                    wma.jpg
                    xhtml.jpg
                    xls.jpg
                    xlsx.jpg
                    xml.jpg
                    zip.jpg
                info.png
                key.png
                label.png
                loading.gif
                logo.png
                preview.png
                processing.gif
                rename.png
                size.png
                sort.png
                storing_animation.gif
                up.png
                upload.png
                url.png
                zip.png
            include
                Response.php
                mime_type_lib.php
                php_image_magician.php
                utils.php
            js
                ViewerJS
                    AGPL-3.0.txt
                    ODFViewerPlugin.css
                    ODFViewerPlugin.js
                    PDFViewerPlugin.css
                    PDFViewerPlugin.js
                    PluginLoader.js
                    compatibility.js
                    example.local.css
                    images
                        kogmbh.png
                        nlnet.png
                        texture.png
                        toolbarButton-download.png
                        toolbarButton-fullscreen.png
                        toolbarButton-menuArrows.png
                        toolbarButton-pageDown.png
                        toolbarButton-pageUp.png
                        toolbarButton-presentation.png
                        toolbarButton-zoomIn.png
                        toolbarButton-zoomOut.png
                    index.html
                    local.css
                    pdf.js
                    pdf.worker.js
                    pdfjsversion.js
                    text_layer_builder.js
                    ui_utils.js
                    viewer.css
                    viewer.js
                    webodf.js
                ZeroClipboard.swf
                include.js
                jPlayer
                    MIT-LICENSE.txt
                    README.md
                    actionscript
                        Jplayer.as
                        Jplayer.fla
                        happyworm
                            jPlayer
                                ConnectManager.as
                                JplayerEvent.as
                                JplayerMp3.as
                                JplayerMp4.as
                                JplayerRtmp.as
                                JplayerStatus.as
                                TraceOut.as
                    add-on
                        jplayer.playlist.js
                        jquery.jplayer.inspector.js
                    jplayer.jquery.json
                    jquery.jplayer
                        Jplayer.swf
                        jquery.jplayer.js
                    package.json
                    popcorn
                        player
                            popcorn.jplayer.js
                    skin
                        blue.monday
                            jplayer.blue.monday.css
                            jplayer.blue.monday.jpg
                            jplayer.blue.monday.seeking.gif
                            jplayer.blue.monday.video.play.png
                            skin.handlebars
                        pink.flag
                            jplayer.pink.flag.css
                            jplayer.pink.flag.jpg
                            jplayer.pink.flag.seeking.gif
                            jplayer.pink.flag.video.play.png
                modernizr.custom.js
                plugins.js
            lang
                az_AZ.php
                bg_BG.php
                ca.php
                cs.php
                da.php
                de.php
                el_GR.php
                en_EN.php
                es.php
                fa.php
                fr_FR.php
                he_IL.php
                hr.php
                hu_HU.php
                id.php
                it.php
                ja.php
                languages.php
                lt.php
                mn_MN.php
                nb_NO.php
                nl.php
                pl.php
                pt_BR.php
                pt_PT.php
                ru.php
                sk.php
                sl.php
                sv_SE.php
                tr_TR.php
                uk_UA.php
                vi.php
                zh_CN.php
            plugin.min.js
            upload.php
            uploader
                index.php
                jupload.php
                success.jpg
                success.php
                wjhk.jupload.jar
        source
            Chrysanthemum.jpg
            source.txt
        thumbs
            Chrysanthemum.jpg
            thumbs.txt
        tinymce
            plugins
                responsivefilemanager
                    img
                        insertfile.gif
                    plugin.min.js
    habout.png
    haccount.png
    haccountedit.png
    hcopyright.png
    hdraft.png
    heditmessage.png
    hedittime.png
    hemailadd.png
    hemailedit.png
    hexclusion.png
    hexport.png
    hgroup.png
    hgroupedit.png
    himport.png
    hlogin.png
    hlogs.png
    hmainpage.png
    hmessage.png
    hnewmessage.png
    hoptions.png
    hpassword.png
    hprofile.png
    hreport.png
    hsend.png
    hsign.png
    hsignedit.png
    hstats.png
    htime.png
    huseradd.png
    husers.png
    hviewgroup.png
    import.png
    index.html
    jqsimplemenu
        css
            jqsimplemenu.css
        images
            darrow.png
            rarrow.png
        index.html
        js
            jqsimplemenu.js
            jquery-1.4.4.min.js
    jquery-autocomplete
        changelog.txt
        demo
            bg.gif
            emails.php
            emails.phps
            images
                Amsterdam Van-Gogh Museum.jpg
                Amsterdam.jpg
                Antwerpen Rubenshaus.jpg
                Antwerpen.jpg
                Appenzell.jpg
                Arnhem Historisches Museum.jpg
                Bled.jpg
                Bled_Die Burg von Bled.jpg
                Bogojina_Die Pfarrkirche.jpg
                BolognaBasilicadiSanPetronio.jpg
                BolognaFontanadelNettuno.jpg
                BolognaPiazzaMaggiore.jpg
                Bolsward Martinikerk.jpg
                Bolsward Stadhuis.jpg
                Bolsward.jpg
                BordeauxND.jpg
                BordeauxPlaceB.jpg
                BotanischerGartenZuerich.jpg
                Bouillon.jpg
                Gent Hotel de Ville2.jpg
                Gent.jpg
                GenuaStrand.jpg
                GenuabeiNacht.jpg
                Giessbachfaelle Brienz.jpg
                Giethoorn.jpg
                Gnesen.jpg
                Gornij Grad_KATHEDRALE.jpg
                Gossensass.jpg
                Grad_Burg Grad2.jpg
                GrandDixence.jpg
                GrenoblePanorama.jpg
                Groningen.jpg
                GrottenvonReclere.jpg
                Guebwiller.jpg
                Kamnik_Die Franziskaner Bibliothek.jpg
                Karlsbad Muehlbrunnkolonnade.jpg
                Kazimierz.jpg
                KirchbergAltesRathaus1.jpg
                KlagenfurtDom.jpg
                KleineMeerjungfreu.jpg
                LazienkiparkWarschau.jpg
                LeHavreHafen.jpg
                LeMans.jpg
                Lednice.jpg
                Leeuwarden Fries Museum.jpg
                Leeuwarden.jpg
                Lelystad.jpg
                Lemmer.jpg
                Leper Halles aux draps.jpg
                Leuven Museum fuer Kirchenkunst.jpg
                Leuven.jpg
                Luxemburg.jpg
                LuzernAltstadt.jpg
                LuzernPicassoMuseum.jpg
                Lyon.jpg
                Maastricht Onze Lieve Vrou...jpg
                Maastricht St Servaasbasiliek.jpg
                Maastricht Walmuur.jpg
                Maastricht.jpg
                MagiatalMaggia.jpg
                Mailand3.jpg
                Metlika_Bela Krajina Museum.jpg
                MilanoCastelloSforzesco.jpg
                MilanoDom.jpg
                MilazzoBurg.jpg
                Novo Mesto_Das Museum.jpg
                ObervellachBurgFalkenstein.jpg
                OdenseeAndersen.jpg
                Olimje_Kirche und Apotheke in Olimje.jpg
                Olomouc.jpg
                OlympischesMuseumLausanne.jpg
                OrleansMaisonJeannedArc.jpg
                OrleansParcFloraldelaSource.jpg
                OstiaAntica.jpg
                Ostrow Tumski.jpg
                PoertschachSchlossLeonstain.jpg
                Portoroz.jpg
                Posen.jpg
                Postojna.jpg
                Prag Altstaedter Ring.jpg
                Prag Waldsteinpalais.jpg
                RouenNotreDame.jpg
                Salzbergwerk Bex.jpg
                SalzbergwerkWieliczka.jpg
                SalzburgFestungHohensalzburg.jpg
                SalzburgResidenz.jpg
                WienMuseumsQuartier.jpg
                WienMusikverein.jpg
                WienRiesenrad.jpg
                WienRingstrasse.jpg
            images.php
            index.html
            indicator.gif
            json.html
            localdata.js
            main.css
            search.php
            search.phps
        jquery.autocomplete.css
        jquery.autocomplete.js
        jquery.autocomplete.min.js
        jquery.autocomplete.pack.js
        lib
            jquery.ajaxQueue.js
            jquery.bgiframe.min.js
            jquery.js
            thickbox-compressed.js
            thickbox.css
        todo
    jquery-ui
        external
            jquery
                jquery.js
        images
            ui-bg_diagonals-thick_18_b81900_40x40.png
            ui-bg_diagonals-thick_20_666666_40x40.png
            ui-bg_flat_0_aaaaaa_40x100.png
            ui-bg_flat_10_000000_40x100.png
            ui-bg_flat_55_fbec88_40x100.png
            ui-bg_flat_75_ffffff_40x100.png
            ui-bg_glass_100_f6f6f6_1x400.png
            ui-bg_glass_100_fdf5ce_1x400.png
            ui-bg_glass_55_fbf9ee_1x400.png
            ui-bg_glass_65_ffffff_1x400.png
            ui-bg_glass_75_d0e5f5_1x400.png
            ui-bg_glass_75_dadada_1x400.png
            ui-bg_glass_75_e6e6e6_1x400.png
            ui-bg_glass_85_dfeffc_1x400.png
            ui-bg_glass_95_fef1ec_1x400.png
            ui-bg_gloss-wave_35_f6a828_500x100.png
            ui-bg_gloss-wave_55_5c9ccc_500x100.png
            ui-bg_highlight-soft_100_eeeeee_1x100.png
            ui-bg_highlight-soft_75_cccccc_1x100.png
            ui-bg_highlight-soft_75_ffe45c_1x100.png
            ui-bg_inset-hard_100_f5f8f9_1x100.png
            ui-bg_inset-hard_100_fcfdfd_1x100.png
            ui-icons_217bc0_256x240.png
            ui-icons_222222_256x240.png
            ui-icons_228ef1_256x240.png
            ui-icons_2e83ff_256x240.png
            ui-icons_454545_256x240.png
            ui-icons_469bdd_256x240.png
            ui-icons_6da8d5_256x240.png
            ui-icons_888888_256x240.png
            ui-icons_cd0a0a_256x240.png
            ui-icons_d8e7f3_256x240.png
            ui-icons_ef8c08_256x240.png
            ui-icons_f9bd01_256x240.png
            ui-icons_ffd27a_256x240.png
            ui-icons_ffffff_256x240.png
        index.html
        jquery-ui.css
        jquery-ui.js
        jquery-ui.min.css
        jquery-ui.min.js
        jquery-ui.structure.css
        jquery-ui.structure.min.css
        jquery-ui.theme.css
        jquery-ui.theme.min.css
    jquery-ui-sliderAccess.js
    jquery-ui-timepicker-addon.css
    jquery-ui-timepicker-addon.js
    jquery-ui.css
    jquery-ui.min.js
    jquery.min.js
    jscolor
        arrow.gif
        cross.gif
        demo.html
        hs.png
        hv.png
        jscolor.js
    mailIcon.ico
    mailIcon.png
    nodelete.png
    notlogin.png
    report.png
    stats.png
    style.css
    time.png
    user.png
    useradd.png
    view
        bg.png
        bgtop.png
        top1.png
        top2.png
        top3.png
    viewgroup.png
smtpcheck.php
system
    .htaccess
    core
        Benchmark.php
        CodeIgniter.php
        Common.php
        Config.php
        Controller.php
        Exceptions.php
        Hooks.php
        Input.php
        Lang.php
        Loader.php
        Log.php
        Model.php
        Output.php
        Router.php
        Security.php
        URI.php
        Utf8.php
        compat
            hash.php
            index.html
            mbstring.php
            password.php
            standard.php
        index.html
    database
        DB.php
        DB_cache.php
        DB_driver.php
        DB_forge.php
        DB_query_builder.php
        DB_result.php
        DB_utility.php
        drivers
            cubrid
                cubrid_driver.php
                cubrid_forge.php
                cubrid_result.php
                cubrid_utility.php
                index.html
            ibase
                ibase_driver.php
                ibase_forge.php
                ibase_result.php
                ibase_utility.php
                index.html
            index.html
            mssql
                index.html
                mssql_driver.php
                mssql_forge.php
                mssql_result.php
                mssql_utility.php
            mysql
                index.html
                mysql_driver.php
                mysql_forge.php
                mysql_result.php
                mysql_utility.php
            mysqli
                index.html
                mysqli_driver.php
                mysqli_forge.php
                mysqli_result.php
                mysqli_utility.php
            oci8
                index.html
                oci8_driver.php
                oci8_forge.php
                oci8_result.php
                oci8_utility.php
            odbc
                index.html
                odbc_driver.php
                odbc_forge.php
                odbc_result.php
                odbc_utility.php
            pdo
                index.html
                pdo_driver.php
                pdo_forge.php
                pdo_result.php
                pdo_utility.php
                subdrivers
                    index.html
                    pdo_4d_driver.php
                    pdo_4d_forge.php
                    pdo_cubrid_driver.php
                    pdo_cubrid_forge.php
                    pdo_dblib_driver.php
                    pdo_dblib_forge.php
                    pdo_firebird_driver.php
                    pdo_firebird_forge.php
                    pdo_ibm_driver.php
                    pdo_ibm_forge.php
                    pdo_informix_driver.php
                    pdo_informix_forge.php
                    pdo_mysql_driver.php
                    pdo_mysql_forge.php
                    pdo_oci_driver.php
                    pdo_oci_forge.php
                    pdo_odbc_driver.php
                    pdo_odbc_forge.php
                    pdo_pgsql_driver.php
                    pdo_pgsql_forge.php
                    pdo_sqlite_driver.php
                    pdo_sqlite_forge.php
                    pdo_sqlsrv_driver.php
                    pdo_sqlsrv_forge.php
            postgre
                index.html
                postgre_driver.php
                postgre_forge.php
                postgre_result.php
                postgre_utility.php
            sqlite
                index.html
                sqlite_driver.php
                sqlite_forge.php
                sqlite_result.php
                sqlite_utility.php
            sqlite3
                index.html
                sqlite3_driver.php
                sqlite3_forge.php
                sqlite3_result.php
                sqlite3_utility.php
            sqlsrv
                index.html
                sqlsrv_driver.php
                sqlsrv_forge.php
                sqlsrv_result.php
                sqlsrv_utility.php
        index.html
    fonts
        index.html
        texb.ttf
    helpers
        array_helper.php
        captcha_helper.php
        cookie_helper.php
        date_helper.php
        directory_helper.php
        download_helper.php
        email_helper.php
        file_helper.php
        form_helper.php
        html_helper.php
        index.html
        inflector_helper.php
        language_helper.php
        number_helper.php
        path_helper.php
        security_helper.php
        smiley_helper.php
        string_helper.php
        text_helper.php
        typography_helper.php
        url_helper.php
        xml_helper.php
    index.html
    language
        english
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        index.html
    libraries
        Cache
            Cache.php
            drivers
                Cache_apc.php
                Cache_dummy.php
                Cache_file.php
                Cache_memcached.php
                Cache_redis.php
                Cache_wincache.php
                index.html
            index.html
        Calendar.php
        Cart.php
        Driver.php
        Email.php
        Encrypt.php
        Encryption.php
        Form_validation.php
        Ftp.php
        Image_lib.php
        Javascript
            Jquery.php
            index.html
        Javascript.php
        Migration.php
        Pagination.php
        Parser.php
        Profiler.php
        Session
            Session.php
            SessionHandlerInterface.php
            Session_driver.php
            drivers
                Session_database_driver.php
                Session_files_driver.php
                Session_memcached_driver.php
                Session_redis_driver.php
                index.html
            index.html
        Table.php
        Trackback.php
        Typography.php
        Unit_test.php
        Upload.php
        User_agent.php
        Xmlrpc.php
        Xmlrpcs.php
        Zip.php
        index.html
thumbs
    sys.txt
uploads
    sys.txt
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Database Driver Class
 *
 * This is the platform-independent base DB implementation class.
 * This class will not be called directly. Rather, the adapter
 * class for the specific database will extend and instantiate it.
 *
 * @package		CodeIgniter
 * @subpackage	Drivers
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
abstract class CI_DB_driver {

	/**
	 * Data Source Name / Connect string
	 *
	 * @var	string
	 */
	public $dsn;

	/**
	 * Username
	 *
	 * @var	string
	 */
	public $username;

	/**
	 * Password
	 *
	 * @var	string
	 */
	public $password;

	/**
	 * Hostname
	 *
	 * @var	string
	 */
	public $hostname;

	/**
	 * Database name
	 *
	 * @var	string
	 */
	public $database;

	/**
	 * Database driver
	 *
	 * @var	string
	 */
	public $dbdriver		= 'mysqli';

	/**
	 * Sub-driver
	 *
	 * @used-by	CI_DB_pdo_driver
	 * @var	string
	 */
	public $subdriver;

	/**
	 * Table prefix
	 *
	 * @var	string
	 */
	public $dbprefix		= '';

	/**
	 * Character set
	 *
	 * @var	string
	 */
	public $char_set		= 'utf8';

	/**
	 * Collation
	 *
	 * @var	string
	 */
	public $dbcollat		= 'utf8_general_ci';

	/**
	 * Encryption flag/data
	 *
	 * @var	mixed
	 */
	public $encrypt			= FALSE;

	/**
	 * Swap Prefix
	 *
	 * @var	string
	 */
	public $swap_pre		= '';

	/**
	 * Database port
	 *
	 * @var	int
	 */
	public $port			= '';

	/**
	 * Persistent connection flag
	 *
	 * @var	bool
	 */
	public $pconnect		= FALSE;

	/**
	 * Connection ID
	 *
	 * @var	object|resource
	 */
	public $conn_id			= FALSE;

	/**
	 * Result ID
	 *
	 * @var	object|resource
	 */
	public $result_id		= FALSE;

	/**
	 * Debug flag
	 *
	 * Whether to display error messages.
	 *
	 * @var	bool
	 */
	public $db_debug		= FALSE;

	/**
	 * Benchmark time
	 *
	 * @var	int
	 */
	public $benchmark		= 0;

	/**
	 * Executed queries count
	 *
	 * @var	int
	 */
	public $query_count		= 0;

	/**
	 * Bind marker
	 *
	 * Character used to identify values in a prepared statement.
	 *
	 * @var	string
	 */
	public $bind_marker		= '?';

	/**
	 * Save queries flag
	 *
	 * Whether to keep an in-memory history of queries for debugging purposes.
	 *
	 * @var	bool
	 */
	public $save_queries		= TRUE;

	/**
	 * Queries list
	 *
	 * @see	CI_DB_driver::$save_queries
	 * @var	string[]
	 */
	public $queries			= array();

	/**
	 * Query times
	 *
	 * A list of times that queries took to execute.
	 *
	 * @var	array
	 */
	public $query_times		= array();

	/**
	 * Data cache
	 *
	 * An internal generic value cache.
	 *
	 * @var	array
	 */
	public $data_cache		= array();

	/**
	 * Transaction enabled flag
	 *
	 * @var	bool
	 */
	public $trans_enabled		= TRUE;

	/**
	 * Strict transaction mode flag
	 *
	 * @var	bool
	 */
	public $trans_strict		= TRUE;

	/**
	 * Transaction depth level
	 *
	 * @var	int
	 */
	protected $_trans_depth		= 0;

	/**
	 * Transaction status flag
	 *
	 * Used with transactions to determine if a rollback should occur.
	 *
	 * @var	bool
	 */
	protected $_trans_status	= TRUE;

	/**
	 * Transaction failure flag
	 *
	 * Used with transactions to determine if a transaction has failed.
	 *
	 * @var	bool
	 */
	protected $_trans_failure	= FALSE;

	/**
	 * Cache On flag
	 *
	 * @var	bool
	 */
	public $cache_on		= FALSE;

	/**
	 * Cache directory path
	 *
	 * @var	bool
	 */
	public $cachedir		= '';

	/**
	 * Cache auto-delete flag
	 *
	 * @var	bool
	 */
	public $cache_autodel		= FALSE;

	/**
	 * DB Cache object
	 *
	 * @see	CI_DB_cache
	 * @var	object
	 */
	public $CACHE;

	/**
	 * Protect identifiers flag
	 *
	 * @var	bool
	 */
	protected $_protect_identifiers		= TRUE;

	/**
	 * List of reserved identifiers
	 *
	 * Identifiers that must NOT be escaped.
	 *
	 * @var	string[]
	 */
	protected $_reserved_identifiers	= array('*');

	/**
	 * Identifier escape character
	 *
	 * @var	string
	 */
	protected $_escape_char = '"';

	/**
	 * ESCAPE statement string
	 *
	 * @var	string
	 */
	protected $_like_escape_str = " ESCAPE '%s' ";

	/**
	 * ESCAPE character
	 *
	 * @var	string
	 */
	protected $_like_escape_chr = '!';

	/**
	 * ORDER BY random keyword
	 *
	 * @var	array
	 */
	protected $_random_keyword = array('RAND()', 'RAND(%d)');

	/**
	 * COUNT string
	 *
	 * @used-by	CI_DB_driver::count_all()
	 * @used-by	CI_DB_query_builder::count_all_results()
	 *
	 * @var	string
	 */
	protected $_count_string = 'SELECT COUNT(*) AS ';

	// --------------------------------------------------------------------

	/**
	 * Class constructor
	 *
	 * @param	array	$params
	 * @return	void
	 */
	public function __construct($params)
	{
		if (is_array($params))
		{
			foreach ($params as $key => $val)
			{
				$this->$key = $val;
			}
		}

		log_message('info', 'Database Driver Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize Database Settings
	 *
	 * @return	bool
	 */
	public function initialize()
	{
		/* If an established connection is available, then there's
		 * no need to connect and select the database.
		 *
		 * Depending on the database driver, conn_id can be either
		 * boolean TRUE, a resource or an object.
		 */
		if ($this->conn_id)
		{
			return TRUE;
		}

		// ----------------------------------------------------------------

		// Connect to the database and set the connection ID
		$this->conn_id = $this->db_connect($this->pconnect);

		// No connection resource? Check if there is a failover else throw an error
		if ( ! $this->conn_id)
		{
			// Check if there is a failover set
			if ( ! empty($this->failover) && is_array($this->failover))
			{
				// Go over all the failovers
				foreach ($this->failover as $failover)
				{
					// Replace the current settings with those of the failover
					foreach ($failover as $key => $val)
					{
						$this->$key = $val;
					}

					// Try to connect
					$this->conn_id = $this->db_connect($this->pconnect);

					// If a connection is made break the foreach loop
					if ($this->conn_id)
					{
						break;
					}
				}
			}

			// We still don't have a connection?
			if ( ! $this->conn_id)
			{
				log_message('error', 'Unable to connect to the database');

				if ($this->db_debug)
				{
					$this->display_error('db_unable_to_connect');
				}

				return FALSE;
			}
		}

		// Now we set the character set and that's all
		return $this->db_set_charset($this->char_set);
	}

	// --------------------------------------------------------------------

	/**
	 * DB connect
	 *
	 * This is just a dummy method that all drivers will override.
	 *
	 * @return	mixed
	 */
	public function db_connect()
	{
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Persistent database connection
	 *
	 * @return	mixed
	 */
	public function db_pconnect()
	{
		return $this->db_connect(TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * Reconnect
	 *
	 * Keep / reestablish the db connection if no queries have been
	 * sent for a length of time exceeding the server's idle timeout.
	 *
	 * This is just a dummy method to allow drivers without such
	 * functionality to not declare it, while others will override it.
	 *
	 * @return	void
	 */
	public function reconnect()
	{
	}

	// --------------------------------------------------------------------

	/**
	 * Select database
	 *
	 * This is just a dummy method to allow drivers without such
	 * functionality to not declare it, while others will override it.
	 *
	 * @return	bool
	 */
	public function db_select()
	{
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Set client character set
	 *
	 * @param	string
	 * @return	bool
	 */
	public function db_set_charset($charset)
	{
		if (method_exists($this, '_db_set_charset') && ! $this->_db_set_charset($charset))
		{
			log_message('error', 'Unable to set database connection charset: '.$charset);

			if ($this->db_debug)
			{
				$this->display_error('db_unable_to_set_charset', $charset);
			}

			return FALSE;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * The name of the platform in use (mysql, mssql, etc...)
	 *
	 * @return	string
	 */
	public function platform()
	{
		return $this->dbdriver;
	}

	// --------------------------------------------------------------------

	/**
	 * Database version number
	 *
	 * Returns a string containing the version of the database being used.
	 * Most drivers will override this method.
	 *
	 * @return	string
	 */
	public function version()
	{
		if (isset($this->data_cache['version']))
		{
			return $this->data_cache['version'];
		}

		if (FALSE === ($sql = $this->_version()))
		{
			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
		}

		$query = $this->query($sql)->row();
		return $this->data_cache['version'] = $query->ver;
	}

	// --------------------------------------------------------------------

	/**
	 * Version number query string
	 *
	 * @return	string
	 */
	protected function _version()
	{
		return 'SELECT VERSION() AS ver';
	}

	// --------------------------------------------------------------------

	/**
	 * Execute the query
	 *
	 * Accepts an SQL string as input and returns a result object upon
	 * successful execution of a "read" type query. Returns boolean TRUE
	 * upon successful execution of a "write" type query. Returns boolean
	 * FALSE upon failure, and if the $db_debug variable is set to TRUE
	 * will raise an error.
	 *
	 * @param	string	$sql
	 * @param	array	$binds = FALSE		An array of binding data
	 * @param	bool	$return_object = NULL
	 * @return	mixed
	 */
	public function query($sql, $binds = FALSE, $return_object = NULL)
	{
		if ($sql === '')
		{
			log_message('error', 'Invalid query: '.$sql);
			return ($this->db_debug) ? $this->display_error('db_invalid_query') : FALSE;
		}
		elseif ( ! is_bool($return_object))
		{
			$return_object = ! $this->is_write_type($sql);
		}

		// Verify table prefix and replace if necessary
		if ($this->dbprefix !== '' && $this->swap_pre !== '' && $this->dbprefix !== $this->swap_pre)
		{
			$sql = preg_replace('/(\W)'.$this->swap_pre.'(\S+?)/', '\\1'.$this->dbprefix.'\\2', $sql);
		}

		// Compile binds if needed
		if ($binds !== FALSE)
		{
			$sql = $this->compile_binds($sql, $binds);
		}

		// Is query caching enabled? If the query is a "read type"
		// we will load the caching class and return the previously
		// cached query if it exists
		if ($this->cache_on === TRUE && $return_object === TRUE && $this->_cache_init())
		{
			$this->load_rdriver();
			if (FALSE !== ($cache = $this->CACHE->read($sql)))
			{
				return $cache;
			}
		}

		// Save the query for debugging
		if ($this->save_queries === TRUE)
		{
			$this->queries[] = $sql;
		}

		// Start the Query Timer
		$time_start = microtime(TRUE);

		// Run the Query
		if (FALSE === ($this->result_id = $this->simple_query($sql)))
		{
			if ($this->save_queries === TRUE)
			{
				$this->query_times[] = 0;
			}

			// This will trigger a rollback if transactions are being used
			if ($this->_trans_depth !== 0)
			{
				$this->_trans_status = FALSE;
			}

			// Grab the error now, as we might run some additional queries before displaying the error
			$error = $this->error();

			// Log errors
			log_message('error', 'Query error: '.$error['message'].' - Invalid query: '.$sql);

			if ($this->db_debug)
			{
				// We call this function in order to roll-back queries
				// if transactions are enabled. If we don't call this here
				// the error message will trigger an exit, causing the
				// transactions to remain in limbo.
				if ($this->_trans_depth !== 0)
				{
					do
					{
						$trans_depth = $this->_trans_depth;
						$this->trans_complete();
						if ($trans_depth === $this->_trans_depth)
						{
							log_message('error', 'Database: Failure during an automated transaction commit/rollback!');
							break;
						}
					}
					while ($this->_trans_depth !== 0);
				}

				// Display errors
				return $this->display_error(array('Error Number: '.$error['code'], $error['message'], $sql));
			}

			return FALSE;
		}

		// Stop and aggregate the query time results
		$time_end = microtime(TRUE);
		$this->benchmark += $time_end - $time_start;

		if ($this->save_queries === TRUE)
		{
			$this->query_times[] = $time_end - $time_start;
		}

		// Increment the query counter
		$this->query_count++;

		// Will we have a result object instantiated? If not - we'll simply return TRUE
		if ($return_object !== TRUE)
		{
			// If caching is enabled we'll auto-cleanup any existing files related to this particular URI
			if ($this->cache_on === TRUE && $this->cache_autodel === TRUE && $this->_cache_init())
			{
				$this->CACHE->delete();
			}

			return TRUE;
		}

		// Load and instantiate the result driver
		$driver		= $this->load_rdriver();
		$RES		= new $driver($this);

		// Is query caching enabled? If so, we'll serialize the
		// result object and save it to a cache file.
		if ($this->cache_on === TRUE && $this->_cache_init())
		{
			// We'll create a new instance of the result object
			// only without the platform specific driver since
			// we can't use it with cached data (the query result
			// resource ID won't be any good once we've cached the
			// result object, so we'll have to compile the data
			// and save it)
			$CR = new CI_DB_result($this);
			$CR->result_object	= $RES->result_object();
			$CR->result_array	= $RES->result_array();
			$CR->num_rows		= $RES->num_rows();

			// Reset these since cached objects can not utilize resource IDs.
			$CR->conn_id		= NULL;
			$CR->result_id		= NULL;

			$this->CACHE->write($sql, $CR);
		}

		return $RES;
	}

	// --------------------------------------------------------------------

	/**
	 * Load the result drivers
	 *
	 * @return	string	the name of the result class
	 */
	public function load_rdriver()
	{
		$driver = 'CI_DB_'.$this->dbdriver.'_result';

		if ( ! class_exists($driver, FALSE))
		{
			require_once(BASEPATH.'database/DB_result.php');
			require_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result.php');
		}

		return $driver;
	}

	// --------------------------------------------------------------------

	/**
	 * Simple Query
	 * This is a simplified version of the query() function. Internally
	 * we only use it when running transaction commands since they do
	 * not require all the features of the main query() function.
	 *
	 * @param	string	the sql query
	 * @return	mixed
	 */
	public function simple_query($sql)
	{
		if ( ! $this->conn_id)
		{
			$this->initialize();
		}

		return $this->_execute($sql);
	}

	// --------------------------------------------------------------------

	/**
	 * Disable Transactions
	 * This permits transactions to be disabled at run-time.
	 *
	 * @return	void
	 */
	public function trans_off()
	{
		$this->trans_enabled = FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Enable/disable Transaction Strict Mode
	 *
	 * When strict mode is enabled, if you are running multiple groups of
	 * transactions, if one group fails all subsequent groups will be
	 * rolled back.
	 *
	 * If strict mode is disabled, each group is treated autonomously,
	 * meaning a failure of one group will not affect any others
	 *
	 * @param	bool	$mode = TRUE
	 * @return	void
	 */
	public function trans_strict($mode = TRUE)
	{
		$this->trans_strict = is_bool($mode) ? $mode : TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Start Transaction
	 *
	 * @param	bool	$test_mode = FALSE
	 * @return	bool
	 */
	public function trans_start($test_mode = FALSE)
	{
		if ( ! $this->trans_enabled)
		{
			return FALSE;
		}

		return $this->trans_begin($test_mode);
	}

	// --------------------------------------------------------------------

	/**
	 * Complete Transaction
	 *
	 * @return	bool
	 */
	public function trans_complete()
	{
		if ( ! $this->trans_enabled)
		{
			return FALSE;
		}

		// The query() function will set this flag to FALSE in the event that a query failed
		if ($this->_trans_status === FALSE OR $this->_trans_failure === TRUE)
		{
			$this->trans_rollback();

			// If we are NOT running in strict mode, we will reset
			// the _trans_status flag so that subsequent groups of
			// transactions will be permitted.
			if ($this->trans_strict === FALSE)
			{
				$this->_trans_status = TRUE;
			}

			log_message('debug', 'DB Transaction Failure');
			return FALSE;
		}

		return $this->trans_commit();
	}

	// --------------------------------------------------------------------

	/**
	 * Lets you retrieve the transaction flag to determine if it has failed
	 *
	 * @return	bool
	 */
	public function trans_status()
	{
		return $this->_trans_status;
	}

	// --------------------------------------------------------------------

	/**
	 * Begin Transaction
	 *
	 * @param	bool	$test_mode
	 * @return	bool
	 */
	public function trans_begin($test_mode = FALSE)
	{
		if ( ! $this->trans_enabled)
		{
			return FALSE;
		}
		// When transactions are nested we only begin/commit/rollback the outermost ones
		elseif ($this->_trans_depth > 0)
		{
			$this->_trans_depth++;
			return TRUE;
		}

		// Reset the transaction failure flag.
		// If the $test_mode flag is set to TRUE transactions will be rolled back
		// even if the queries produce a successful result.
		$this->_trans_failure = ($test_mode === TRUE);

		if ($this->_trans_begin())
		{
			$this->_trans_depth++;
			return TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Commit Transaction
	 *
	 * @return	bool
	 */
	public function trans_commit()
	{
		if ( ! $this->trans_enabled OR $this->_trans_depth === 0)
		{
			return FALSE;
		}
		// When transactions are nested we only begin/commit/rollback the outermost ones
		elseif ($this->_trans_depth > 1 OR $this->_trans_commit())
		{
			$this->_trans_depth--;
			return TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Rollback Transaction
	 *
	 * @return	bool
	 */
	public function trans_rollback()
	{
		if ( ! $this->trans_enabled OR $this->_trans_depth === 0)
		{
			return FALSE;
		}
		// When transactions are nested we only begin/commit/rollback the outermost ones
		elseif ($this->_trans_depth > 1 OR $this->_trans_rollback())
		{
			$this->_trans_depth--;
			return TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Compile Bindings
	 *
	 * @param	string	the sql statement
	 * @param	array	an array of bind data
	 * @return	string
	 */
	public function compile_binds($sql, $binds)
	{
		if (empty($binds) OR empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE)
		{
			return $sql;
		}
		elseif ( ! is_array($binds))
		{
			$binds = array($binds);
			$bind_count = 1;
		}
		else
		{
			// Make sure we're using numeric keys
			$binds = array_values($binds);
			$bind_count = count($binds);
		}

		// We'll need the marker length later
		$ml = strlen($this->bind_marker);

		// Make sure not to replace a chunk inside a string that happens to match the bind marker
		if ($c = preg_match_all("/'[^']*'/i", $sql, $matches))
		{
			$c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i',
				str_replace($matches[0],
					str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]),
					$sql, $c),
				$matches, PREG_OFFSET_CAPTURE);

			// Bind values' count must match the count of markers in the query
			if ($bind_count !== $c)
			{
				return $sql;
			}
		}
		elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count)
		{
			return $sql;
		}

		do
		{
			$c--;
			$escaped_value = $this->escape($binds[$c]);
			if (is_array($escaped_value))
			{
				$escaped_value = '('.implode(',', $escaped_value).')';
			}
			$sql = substr_replace($sql, $escaped_value, $matches[0][$c][1], $ml);
		}
		while ($c !== 0);

		return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Determines if a query is a "write" type.
	 *
	 * @param	string	An SQL query string
	 * @return	bool
	 */
	public function is_write_type($sql)
	{
		return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|REINDEX)\s/i', $sql);
	}

	// --------------------------------------------------------------------

	/**
	 * Calculate the aggregate query elapsed time
	 *
	 * @param	int	The number of decimal places
	 * @return	string
	 */
	public function elapsed_time($decimals = 6)
	{
		return number_format($this->benchmark, $decimals);
	}

	// --------------------------------------------------------------------

	/**
	 * Returns the total number of queries
	 *
	 * @return	int
	 */
	public function total_queries()
	{
		return $this->query_count;
	}

	// --------------------------------------------------------------------

	/**
	 * Returns the last query that was executed
	 *
	 * @return	string
	 */
	public function last_query()
	{
		return end($this->queries);
	}

	// --------------------------------------------------------------------

	/**
	 * "Smart" Escape String
	 *
	 * Escapes data based on type
	 * Sets boolean and null types
	 *
	 * @param	string
	 * @return	mixed
	 */
	public function escape($str)
	{
		if (is_array($str))
		{
			$str = array_map(array(&$this, 'escape'), $str);
			return $str;
		}
		elseif (is_string($str) OR (is_object($str) && method_exists($str, '__toString')))
		{
			return "'".$this->escape_str($str)."'";
		}
		elseif (is_bool($str))
		{
			return ($str === FALSE) ? 0 : 1;
		}
		elseif ($str === NULL)
		{
			return 'NULL';
		}

		return $str;
	}

	// --------------------------------------------------------------------

	/**
	 * Escape String
	 *
	 * @param	string|string[]	$str	Input string
	 * @param	bool	$like	Whether or not the string will be used in a LIKE condition
	 * @return	string
	 */
	public function escape_str($str, $like = FALSE)
	{
		if (is_array($str))
		{
			foreach ($str as $key => $val)
			{
				$str[$key] = $this->escape_str($val, $like);
			}

			return $str;
		}

		$str = $this->_escape_str($str);

		// escape LIKE condition wildcards
		if ($like === TRUE)
		{
			return str_replace(
				array($this->_like_escape_chr, '%', '_'),
				array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
				$str
			);
		}

		return $str;
	}

	// --------------------------------------------------------------------

	/**
	 * Escape LIKE String
	 *
	 * Calls the individual driver for platform
	 * specific escaping for LIKE conditions
	 *
	 * @param	string|string[]
	 * @return	mixed
	 */
	public function escape_like_str($str)
	{
		return $this->escape_str($str, TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * Platform-dependant string escape
	 *
	 * @param	string
	 * @return	string
	 */
	protected function _escape_str($str)
	{
		return str_replace("'", "''", remove_invisible_characters($str));
	}

	// --------------------------------------------------------------------

	/**
	 * Primary
	 *
	 * Retrieves the primary key. It assumes that the row in the first
	 * position is the primary key
	 *
	 * @param	string	$table	Table name
	 * @return	string
	 */
	public function primary($table)
	{
		$fields = $this->list_fields($table);
		return is_array($fields) ? current($fields) : FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * "Count All" query
	 *
	 * Generates a platform-specific query string that counts all records in
	 * the specified database
	 *
	 * @param	string
	 * @return	int
	 */
	public function count_all($table = '')
	{
		if ($table === '')
		{
			return 0;
		}

		$query = $this->query($this->_count_string.$this->escape_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
		if ($query->num_rows() === 0)
		{
			return 0;
		}

		$query = $query->row();
		$this->_reset_select();
		return (int) $query->numrows;
	}

	// --------------------------------------------------------------------

	/**
	 * Returns an array of table names
	 *
	 * @param	string	$constrain_by_prefix = FALSE
	 * @return	array
	 */
	public function list_tables($constrain_by_prefix = FALSE)
	{
		// Is there a cached result?
		if (isset($this->data_cache['table_names']))
		{
			return $this->data_cache['table_names'];
		}

		if (FALSE === ($sql = $this->_list_tables($constrain_by_prefix)))
		{
			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
		}

		$this->data_cache['table_names'] = array();
		$query = $this->query($sql);

		foreach ($query->result_array() as $row)
		{
			// Do we know from which column to get the table name?
			if ( ! isset($key))
			{
				if (isset($row['table_name']))
				{
					$key = 'table_name';
				}
				elseif (isset($row['TABLE_NAME']))
				{
					$key = 'TABLE_NAME';
				}
				else
				{
					/* We have no other choice but to just get the first element's key.
					 * Due to array_shift() accepting its argument by reference, if
					 * E_STRICT is on, this would trigger a warning. So we'll have to
					 * assign it first.
					 */
					$key = array_keys($row);
					$key = array_shift($key);
				}
			}

			$this->data_cache['table_names'][] = $row[$key];
		}

		return $this->data_cache['table_names'];
	}

	// --------------------------------------------------------------------

	/**
	 * Determine if a particular table exists
	 *
	 * @param	string	$table_name
	 * @return	bool
	 */
	public function table_exists($table_name)
	{
		return in_array($this->protect_identifiers($table_name, TRUE, FALSE, FALSE), $this->list_tables());
	}

	// --------------------------------------------------------------------

	/**
	 * Fetch Field Names
	 *
	 * @param	string	$table	Table name
	 * @return	array
	 */
	public function list_fields($table)
	{
		// Is there a cached result?
		if (isset($this->data_cache['field_names'][$table]))
		{
			return $this->data_cache['field_names'][$table];
		}

		if (FALSE === ($sql = $this->_list_columns($table)))
		{
			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
		}

		$query = $this->query($sql);
		$this->data_cache['field_names'][$table] = array();

		foreach ($query->result_array() as $row)
		{
			// Do we know from where to get the column's name?
			if ( ! isset($key))
			{
				if (isset($row['column_name']))
				{
					$key = 'column_name';
				}
				elseif (isset($row['COLUMN_NAME']))
				{
					$key = 'COLUMN_NAME';
				}
				else
				{
					// We have no other choice but to just get the first element's key.
					$key = key($row);
				}
			}

			$this->data_cache['field_names'][$table][] = $row[$key];
		}

		return $this->data_cache['field_names'][$table];
	}

	// --------------------------------------------------------------------

	/**
	 * Determine if a particular field exists
	 *
	 * @param	string
	 * @param	string
	 * @return	bool
	 */
	public function field_exists($field_name, $table_name)
	{
		return in_array($field_name, $this->list_fields($table_name));
	}

	// --------------------------------------------------------------------

	/**
	 * Returns an object with field data
	 *
	 * @param	string	$table	the table name
	 * @return	array
	 */
	public function field_data($table)
	{
		$query = $this->query($this->_field_data($this->protect_identifiers($table, TRUE, NULL, FALSE)));
		return ($query) ? $query->field_data() : FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Escape the SQL Identifiers
	 *
	 * This function escapes column and table names
	 *
	 * @param	mixed
	 * @return	mixed
	 */
	public function escape_identifiers($item)
	{
		if ($this->_escape_char === '' OR empty($item) OR in_array($item, $this->_reserved_identifiers))
		{
			return $item;
		}
		elseif (is_array($item))
		{
			foreach ($item as $key => $value)
			{
				$item[$key] = $this->escape_identifiers($value);
			}

			return $item;
		}
		// Avoid breaking functions and literal values inside queries
		elseif (ctype_digit($item) OR $item[0] === "'" OR ($this->_escape_char !== '"' && $item[0] === '"') OR strpos($item, '(') !== FALSE)
		{
			return $item;
		}

		static $preg_ec = array();

		if (empty($preg_ec))
		{
			if (is_array($this->_escape_char))
			{
				$preg_ec = array(
					preg_quote($this->_escape_char[0], '/'),
					preg_quote($this->_escape_char[1], '/'),
					$this->_escape_char[0],
					$this->_escape_char[1]
				);
			}
			else
			{
				$preg_ec[0] = $preg_ec[1] = preg_quote($this->_escape_char, '/');
				$preg_ec[2] = $preg_ec[3] = $this->_escape_char;
			}
		}

		foreach ($this->_reserved_identifiers as $id)
		{
			if (strpos($item, '.'.$id) !== FALSE)
			{
				return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?\./i', $preg_ec[2].'$1'.$preg_ec[3].'.', $item);
			}
		}

		return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?(\.)?/i', $preg_ec[2].'$1'.$preg_ec[3].'$2', $item);
	}

	// --------------------------------------------------------------------

	/**
	 * Generate an insert string
	 *
	 * @param	string	the table upon which the query will be performed
	 * @param	array	an associative array data of key/values
	 * @return	string
	 */
	public function insert_string($table, $data)
	{
		$fields = $values = array();

		foreach ($data as $key => $val)
		{
			$fields[] = $this->escape_identifiers($key);
			$values[] = $this->escape($val);
		}

		return $this->_insert($this->protect_identifiers($table, TRUE, NULL, FALSE), $fields, $values);
	}

	// --------------------------------------------------------------------

	/**
	 * Insert statement
	 *
	 * Generates a platform-specific insert string from the supplied data
	 *
	 * @param	string	the table name
	 * @param	array	the insert keys
	 * @param	array	the insert values
	 * @return	string
	 */
	protected function _insert($table, $keys, $values)
	{
		return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
	}

	// --------------------------------------------------------------------

	/**
	 * Generate an update string
	 *
	 * @param	string	the table upon which the query will be performed
	 * @param	array	an associative array data of key/values
	 * @param	mixed	the "where" statement
	 * @return	string
	 */
	public function update_string($table, $data, $where)
	{
		if (empty($where))
		{
			return FALSE;
		}

		$this->where($where);

		$fields = array();
		foreach ($data as $key => $val)
		{
			$fields[$this->protect_identifiers($key)] = $this->escape($val);
		}

		$sql = $this->_update($this->protect_identifiers($table, TRUE, NULL, FALSE), $fields);
		$this->_reset_write();
		return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Update statement
	 *
	 * Generates a platform-specific update string from the supplied data
	 *
	 * @param	string	the table name
	 * @param	array	the update data
	 * @return	string
	 */
	protected function _update($table, $values)
	{
		foreach ($values as $key => $val)
		{
			$valstr[] = $key.' = '.$val;
		}

		return 'UPDATE '.$table.' SET '.implode(', ', $valstr)
			.$this->_compile_wh('qb_where')
			.$this->_compile_order_by()
			.($this->qb_limit ? ' LIMIT '.$this->qb_limit : '');
	}

	// --------------------------------------------------------------------

	/**
	 * Tests whether the string has an SQL operator
	 *
	 * @param	string
	 * @return	bool
	 */
	protected function _has_operator($str)
	{
		return (bool) preg_match('/(<|>|!|=|\sIS NULL|\sIS NOT NULL|\sEXISTS|\sBETWEEN|\sLIKE|\sIN\s*\(|\s)/i', trim($str));
	}

	// --------------------------------------------------------------------

	/**
	 * Returns the SQL string operator
	 *
	 * @param	string
	 * @return	string
	 */
	protected function _get_operator($str)
	{
		static $_operators;

		if (empty($_operators))
		{
			$_les = ($this->_like_escape_str !== '')
				? '\s+'.preg_quote(trim(sprintf($this->_like_escape_str, $this->_like_escape_chr)), '/')
				: '';
			$_operators = array(
				'\s*(?:<|>|!)?=\s*',             // =, <=, >=, !=
				'\s*<>?\s*',                     // <, <>
				'\s*>\s*',                       // >
				'\s+IS NULL',                    // IS NULL
				'\s+IS NOT NULL',                // IS NOT NULL
				'\s+EXISTS\s*\([^\)]+\)',        // EXISTS(sql)
				'\s+NOT EXISTS\s*\([^\)]+\)',    // NOT EXISTS(sql)
				'\s+BETWEEN\s+',                 // BETWEEN value AND value
				'\s+IN\s*\([^\)]+\)',            // IN(list)
				'\s+NOT IN\s*\([^\)]+\)',        // NOT IN (list)
				'\s+LIKE\s+\S.*('.$_les.')?',    // LIKE 'expr'[ ESCAPE '%s']
				'\s+NOT LIKE\s+\S.*('.$_les.')?' // NOT LIKE 'expr'[ ESCAPE '%s']
			);

		}

		return preg_match('/'.implode('|', $_operators).'/i', $str, $match)
			? $match[0] : FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Enables a native PHP function to be run, using a platform agnostic wrapper.
	 *
	 * @param	string	$function	Function name
	 * @return	mixed
	 */
	public function call_function($function)
	{
		$driver = ($this->dbdriver === 'postgre') ? 'pg_' : $this->dbdriver.'_';

		if (FALSE === strpos($driver, $function))
		{
			$function = $driver.$function;
		}

		if ( ! function_exists($function))
		{
			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
		}

		return (func_num_args() > 1)
			? call_user_func_array($function, array_slice(func_get_args(), 1))
			: call_user_func($function);
	}

	// --------------------------------------------------------------------

	/**
	 * Set Cache Directory Path
	 *
	 * @param	string	the path to the cache directory
	 * @return	void
	 */
	public function cache_set_path($path = '')
	{
		$this->cachedir = $path;
	}

	// --------------------------------------------------------------------

	/**
	 * Enable Query Caching
	 *
	 * @return	bool	cache_on value
	 */
	public function cache_on()
	{
		return $this->cache_on = TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Disable Query Caching
	 *
	 * @return	bool	cache_on value
	 */
	public function cache_off()
	{
		return $this->cache_on = FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Delete the cache files associated with a particular URI
	 *
	 * @param	string	$segment_one = ''
	 * @param	string	$segment_two = ''
	 * @return	bool
	 */
	public function cache_delete($segment_one = '', $segment_two = '')
	{
		return $this->_cache_init()
			? $this->CACHE->delete($segment_one, $segment_two)
			: FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Delete All cache files
	 *
	 * @return	bool
	 */
	public function cache_delete_all()
	{
		return $this->_cache_init()
			? $this->CACHE->delete_all()
			: FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize the Cache Class
	 *
	 * @return	bool
	 */
	protected function _cache_init()
	{
		if ( ! class_exists('CI_DB_Cache', FALSE))
		{
			require_once(BASEPATH.'database/DB_cache.php');
		}
		elseif (is_object($this->CACHE))
		{
			return TRUE;
		}

		$this->CACHE = new CI_DB_Cache($this); // pass db object to support multiple db connections and returned db objects
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Close DB Connection
	 *
	 * @return	void
	 */
	public function close()
	{
		if ($this->conn_id)
		{
			$this->_close();
			$this->conn_id = FALSE;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Close DB Connection
	 *
	 * This method would be overridden by most of the drivers.
	 *
	 * @return	void
	 */
	protected function _close()
	{
		$this->conn_id = FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Display an error message
	 *
	 * @param	string	the error message
	 * @param	string	any "swap" values
	 * @param	bool	whether to localize the message
	 * @return	string	sends the application/views/errors/error_db.php template
	 */
	public function display_error($error = '', $swap = '', $native = FALSE)
	{
		$LANG =& load_class('Lang', 'core');
		$LANG->load('db');

		$heading = $LANG->line('db_error_heading');

		if ($native === TRUE)
		{
			$message = (array) $error;
		}
		else
		{
			$message = is_array($error) ? $error : array(str_replace('%s', $swap, $LANG->line($error)));
		}

		// Find the most likely culprit of the error by going through
		// the backtrace until the source file is no longer in the
		// database folder.
		$trace = debug_backtrace();
		foreach ($trace as $call)
		{
			if (isset($call['file'], $call['class']))
			{
				// We'll need this on Windows, as APPPATH and BASEPATH will always use forward slashes
				if (DIRECTORY_SEPARATOR !== '/')
				{
					$call['file'] = str_replace('\\', '/', $call['file']);
				}

				if (strpos($call['file'], BASEPATH.'database') === FALSE && strpos($call['class'], 'Loader') === FALSE)
				{
					// Found it - use a relative path for safety
					$message[] = 'Filename: '.str_replace(array(APPPATH, BASEPATH), '', $call['file']);
					$message[] = 'Line Number: '.$call['line'];
					break;
				}
			}
		}

		$error =& load_class('Exceptions', 'core');
		echo $error->show_error($heading, $message, 'error_db');
		exit(8); // EXIT_DATABASE
	}

	// --------------------------------------------------------------------

	/**
	 * Protect Identifiers
	 *
	 * This function is used extensively by the Query Builder class, and by
	 * a couple functions in this class.
	 * It takes a column or table name (optionally with an alias) and inserts
	 * the table prefix onto it. Some logic is necessary in order to deal with
	 * column names that include the path. Consider a query like this:
	 *
	 * SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table
	 *
	 * Or a query with aliasing:
	 *
	 * SELECT m.member_id, m.member_name FROM members AS m
	 *
	 * Since the column name can include up to four segments (host, DB, table, column)
	 * or also have an alias prefix, we need to do a bit of work to figure this out and
	 * insert the table prefix (if it exists) in the proper position, and escape only
	 * the correct identifiers.
	 *
	 * @param	string
	 * @param	bool
	 * @param	mixed
	 * @param	bool
	 * @return	string
	 */
	public function protect_identifiers($item, $prefix_single = FALSE, $protect_identifiers = NULL, $field_exists = TRUE)
	{
		if ( ! is_bool($protect_identifiers))
		{
			$protect_identifiers = $this->_protect_identifiers;
		}

		if (is_array($item))
		{
			$escaped_array = array();
			foreach ($item as $k => $v)
			{
				$escaped_array[$this->protect_identifiers($k)] = $this->protect_identifiers($v, $prefix_single, $protect_identifiers, $field_exists);
			}

			return $escaped_array;
		}

		// This is basically a bug fix for queries that use MAX, MIN, etc.
		// If a parenthesis is found we know that we do not need to
		// escape the data or add a prefix. There's probably a more graceful
		// way to deal with this, but I'm not thinking of it -- Rick
		//
		// Added exception for single quotes as well, we don't want to alter
		// literal strings. -- Narf
		if (strcspn($item, "()'") !== strlen($item))
		{
			return $item;
		}

		// Convert tabs or multiple spaces into single spaces
		$item = preg_replace('/\s+/', ' ', trim($item));

		// If the item has an alias declaration we remove it and set it aside.
		// Note: strripos() is used in order to support spaces in table names
		if ($offset = strripos($item, ' AS '))
		{
			$alias = ($protect_identifiers)
				? substr($item, $offset, 4).$this->escape_identifiers(substr($item, $offset + 4))
				: substr($item, $offset);
			$item = substr($item, 0, $offset);
		}
		elseif ($offset = strrpos($item, ' '))
		{
			$alias = ($protect_identifiers)
				? ' '.$this->escape_identifiers(substr($item, $offset + 1))
				: substr($item, $offset);
			$item = substr($item, 0, $offset);
		}
		else
		{
			$alias = '';
		}

		// Break the string apart if it contains periods, then insert the table prefix
		// in the correct location, assuming the period doesn't indicate that we're dealing
		// with an alias. While we're at it, we will escape the components
		if (strpos($item, '.') !== FALSE)
		{
			$parts = explode('.', $item);

			// Does the first segment of the exploded item match
			// one of the aliases previously identified? If so,
			// we have nothing more to do other than escape the item
			//
			// NOTE: The ! empty() condition prevents this method
			//       from breaking when QB isn't enabled.
			if ( ! empty($this->qb_aliased_tables) && in_array($parts[0], $this->qb_aliased_tables))
			{
				if ($protect_identifiers === TRUE)
				{
					foreach ($parts as $key => $val)
					{
						if ( ! in_array($val, $this->_reserved_identifiers))
						{
							$parts[$key] = $this->escape_identifiers($val);
						}
					}

					$item = implode('.', $parts);
				}

				return $item.$alias;
			}

			// Is there a table prefix defined in the config file? If not, no need to do anything
			if ($this->dbprefix !== '')
			{
				// We now add the table prefix based on some logic.
				// Do we have 4 segments (hostname.database.table.column)?
				// If so, we add the table prefix to the column name in the 3rd segment.
				if (isset($parts[3]))
				{
					$i = 2;
				}
				// Do we have 3 segments (database.table.column)?
				// If so, we add the table prefix to the column name in 2nd position
				elseif (isset($parts[2]))
				{
					$i = 1;
				}
				// Do we have 2 segments (table.column)?
				// If so, we add the table prefix to the column name in 1st segment
				else
				{
					$i = 0;
				}

				// This flag is set when the supplied $item does not contain a field name.
				// This can happen when this function is being called from a JOIN.
				if ($field_exists === FALSE)
				{
					$i++;
				}

				// Verify table prefix and replace if necessary
				if ($this->swap_pre !== '' && strpos($parts[$i], $this->swap_pre) === 0)
				{
					$parts[$i] = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $parts[$i]);
				}
				// We only add the table prefix if it does not already exist
				elseif (strpos($parts[$i], $this->dbprefix) !== 0)
				{
					$parts[$i] = $this->dbprefix.$parts[$i];
				}

				// Put the parts back together
				$item = implode('.', $parts);
			}

			if ($protect_identifiers === TRUE)
			{
				$item = $this->escape_identifiers($item);
			}

			return $item.$alias;
		}

		// Is there a table prefix? If not, no need to insert it
		if ($this->dbprefix !== '')
		{
			// Verify table prefix and replace if necessary
			if ($this->swap_pre !== '' && strpos($item, $this->swap_pre) === 0)
			{
				$item = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $item);
			}
			// Do we prefix an item with no segments?
			elseif ($prefix_single === TRUE && strpos($item, $this->dbprefix) !== 0)
			{
				$item = $this->dbprefix.$item;
			}
		}

		if ($protect_identifiers === TRUE && ! in_array($item, $this->_reserved_identifiers))
		{
			$item = $this->escape_identifiers($item);
		}

		return $item.$alias;
	}

	// --------------------------------------------------------------------

	/**
	 * Dummy method that allows Query Builder class to be disabled
	 * and keep count_all() working.
	 *
	 * @return	void
	 */
	protected function _reset_select()
	{
	}

}




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