/**
  * {@inheritdoc}
  */
 public function deleteRows(PersistentCollection $coll)
 {
     $diff = $coll->getDeleteDiff();
     $sql = $this->getDeleteRowSQL($coll);
     foreach ($diff as $element) {
         $this->conn->executeUpdate($sql, $this->getDeleteRowSQLParameters($coll, $element));
     }
 }
 public function deleteRows(PersistentCollection $coll)
 {
     $deleteDiff = $coll->getDeleteDiff();
     $sql = $this->_getDeleteRowSql($coll);
     foreach ($deleteDiff as $element) {
         $this->_conn->exec($sql, $this->_getDeleteRowSqlParameters($coll, $element));
     }
 }