C:/xampp/htdocs/moodle/enrol/authorize/db/upgrade.php

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<?php

// This file keeps track of upgrades to
// the authorize enrol plugin
//
// Sometimes, changes between versions involve
// alterations to database structures and other
// major things that may break installations.
//
// The upgrade function in this file will attempt
// to perform all the necessary actions to upgrade
// your older installation to the current version.
//
// If there's something it cannot do itself, it
// will tell you what you need to do.
//
// The commands in here will all be database-neutral,
// using the methods of database_manager class
//
// Please do not forget to use upgrade_set_timeout()
// before any action that may take longer time to finish.

function xmldb_enrol_authorize_upgrade($oldversion) {
    global $CFG, $DB, $OUTPUT;

    $dbman = $DB->get_manager();

    //===== 1.9.0 upgrade line ======//

    if ($oldversion < 2008092700) {
        $table = new xmldb_table('enrol_authorize');
        $index = new xmldb_index('transid', XMLDB_INDEX_NOTUNIQUE, array('transid'));
        if ($dbman->index_exists($table, $index)) {
            $dbman->drop_index($table, $index);
        }

        $table = new xmldb_table('enrol_authorize');
        $field = new xmldb_field('transid', XMLDB_TYPE_INTEGER, '20', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, '0', 'userid');
        $dbman->change_field_precision($table, $field);

        $table = new xmldb_table('enrol_authorize');
        $index = new xmldb_index('transid', XMLDB_INDEX_NOTUNIQUE, array('transid'));
        $dbman->add_index($table, $index);

        $table = new xmldb_table('enrol_authorize_refunds');
        $index = new xmldb_index('transid', XMLDB_INDEX_NOTUNIQUE, array('transid'));
        if ($dbman->index_exists($table, $index)) {
            $dbman->drop_index($table, $index);
        }

        $table = new xmldb_table('enrol_authorize_refunds');
        $field = new xmldb_field('transid', XMLDB_TYPE_INTEGER, '20', XMLDB_UNSIGNED, null, null, '0', 'amount');
        $dbman->change_field_precision($table, $field);

        $table = new xmldb_table('enrol_authorize_refunds');
        $index = new xmldb_index('transid', XMLDB_INDEX_NOTUNIQUE, array('transid'));
        $dbman->add_index($table, $index);

        upgrade_plugin_savepoint(true, 2008092700, 'enrol', 'authorize');
    }

    if ($oldversion < 2009042700) {

        $table = new xmldb_table('enrol_authorize');
        $field = new xmldb_field('paymentmethod', XMLDB_TYPE_CHAR, '6', null, XMLDB_NOTNULL, null, 'cc', 'id');

        $dbman->drop_enum_from_field($table, $field);

        upgrade_plugin_savepoint(true, 2009042700, 'enrol', 'authorize');
    }

    // Add instanceid field to enrol_authorize table
    if ($oldversion < 2010081203) {
        $table = new xmldb_table('enrol_authorize');
        $field = new xmldb_field('instanceid');
        if (!$dbman->field_exists($table, $field)) {
            $field->set_attributes(XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, 0, 'userid');
            $dbman->add_field($table, $field);
        }
        upgrade_plugin_savepoint(true, 2010081203, 'enrol', 'authorize');
    }

    // Moodle v2.1.0 release upgrade line
    // Put any upgrade step following this

    // Moodle v2.2.0 release upgrade line
    // Put any upgrade step following this

    return true;
}