/**
* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT
* column.
*
* As a convention, on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
* from the arguments and returns the last id generated by that sequence.
* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
* returns the last value generated for such a column, and the table name
* argument is disregarded.
*
* @param string $tableName
* OPTIONAL Name of table.
* @param string $primaryKey
* OPTIONAL Name of primary key column.
* @return string
*/
public function lastInsertId($tableName = null, $primaryKey = null)
{
return $this->adapter->lastInsertId($tableName, $primaryKey);
}