original_string: public function lastSequenceId($sequenceName)
      {
          $sql = 'SELECT PREVVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
          $value = $this->_adapter->fetchOne($sql);
          return $value;
      }
code: public function lastSequenceId($sequenceName)
      {
          $sql = 'SELECT PREVVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
          $value = $this->_adapter->fetchOne($sql);
          return $value;
      }
code_tokens: public function lastSequenceId ( $ sequenceName ) { $ sql = 'SELECT PREVVAL FOR ' . $ this -> _adapter -> quoteIdentifier ( $ sequenceName ) . ' AS VAL FROM SYSIBM.SYSDUMMY1' ; $ value = $ this -> _adapter -> fetchOne ( $ sql ) ; return $ value ; }
docstring: DB2-specific last sequence id
  
  @param string $sequenceName
  @return integer
docstring_tokens: DB2 - specific last sequence id