/**
* createSavepoint
* creates a new savepoint
*
* @param string $savepoint name of a savepoint to set
* @return void
*/
public function createSavepoint($savepoint)
{
if (!$this->_platform->supportsSavepoints()) {
throw ConnectionException::savepointsNotSupported();
}
$this->_conn->exec($this->_platform->createSavePoint($savepoint));
}