public static function checkAutoIncrement($server, $user, $pwd)
{
try {
$link = DbPDO::_getPDO($server, $user, $pwd, false, 5);
} catch (PDOException $e) {
return false;
}
$ret = (bool) (($result = $link->query('SELECT @@auto_increment_increment as aii')) && ($row = $result->fetch()) && $row['aii'] == 1);
$ret &= (bool) (($result = $link->query('SELECT @@auto_increment_offset as aio')) && ($row = $result->fetch()) && $row['aio'] == 1);
unset($link);
return $ret;
}
/**
* 设置要操作的数据表
* @param string $tbName 表名
* @return object 当前类的实例
*/
private static function table($tbName)
{
self::$_table = "`" . DB_TB_PREFIX . strtolower($tbName) . "`";
return self::$_instance;
}
/**
* @see Db::checkEncoding()
*/
public static function tryUTF8($server, $user, $pwd)
{
try {
$link = DbPDO::_getPDO($server, $user, $pwd, false, 5);
} catch (PDOException $e) {
return false;
}
$result = $link->exec('SET NAMES \'utf8\'');
unset($link);
return $result === false ? false : true;
}
/**
* Rollback a transaction!
* This includes a clear_sql()!
*
* A transaction can be rolled back any time ..
*/
public function rollbackTransaction()
{
// only do anything if there is an active transaction
if (self::$trx_token == 0) {
return;
}
$this->clear_sql();
$this->rollBack();
self::$trx_token = 0;
}