private function escape($arg)
{
return "'" . ($this->connection ? $this->connection->escape($arg) : mysql_escape_string($arg)) . "'";
}
/**
* 处理当前链接已经有事务的情况
*
* @param ZcDbConnection $conn
* @param ZcTransactionDefinition $transactionDefinition
*/
private function handleExistingTransaction($conn, $transactionDefinition)
{
if ($transactionDefinition->getPropagationBehavior() == ZcTransactionDefinition::PROPAGATION_REQUIRED) {
$status = new ZcTransactionStatus($conn, $transactionDefinition, false);
return $status;
}
if ($transactionDefinition->getPropagationBehavior() == ZcTransactionDefinition::PROPAGATION_NESTED) {
if (!$conn->supportsSavepoints()) {
throw new ZcDbException("{$conn} do not support savepoints");
}
$status = new ZcTransactionStatus($conn, $transactionDefinition, false);
$status->createAndHoldSavepoint();
return $status;
}
}
public function hasTransaction()
{
return $this->connection->isTransactionActive();
}