update.php

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<?php
function xoops_module_update_pm(&$module, $oldversion = null) 
{
 
    if ($oldversion <= 100) {
    GLOBAL $xoopsDB;
    // Check pm table version
    $sql = "SHOW COLUMNS FROM " . $xoopsDB->prefix("priv_msgs");
    if (!$result = $xoopsDB->queryF($sql)) {
        return false;
    }
    // Migrate from existent pm module
    if ( ($rows = $xoopsDB->getRowsNum($result)) == 12) {
        return true;
    } elseif ($rows == 8) {
        return $xoopsDB->queryFromFile(XOOPS_ROOT_PATH . "/modules/" . $module->getVar('dirname', 'n') . "/sql/mysql.upgrade.sql");
    } else {
        return false;
    }
    }
}
?>