original_string: protected function _checkRequiredColumns()
      {
          if ($this->_modifiedColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::MODIFIED_COLUMN . "' which names the "
                . "session table last modification time column.");
          } else if ($this->_lifetimeColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::LIFETIME_COLUMN . "' which names the "
                . "session table lifetime column.");
          } else if ($this->_dataColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::DATA_COLUMN . "' which names the "
                . "session table data column.");
          }
      }
code: protected function _checkRequiredColumns()
      {
          if ($this->_modifiedColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::MODIFIED_COLUMN . "' which names the "
                . "session table last modification time column.");
          } else if ($this->_lifetimeColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::LIFETIME_COLUMN . "' which names the "
                . "session table lifetime column.");
          } else if ($this->_dataColumn === null) {
              /**
               * @see Zend_Session_SaveHandler_Exception
               */
              // require_once 'Zend/Session/SaveHandler/Exception.php';
  
              throw new Zend_Session_SaveHandler_Exception(
                  "Configuration must define '" . self::DATA_COLUMN . "' which names the "
                . "session table data column.");
          }
      }
code_tokens: protected function _checkRequiredColumns ( ) { if ( $ this -> _modifiedColumn === null ) { /**
               * @see Zend_Session_SaveHandler_Exception
               */ // require_once 'Zend/Session/SaveHandler/Exception.php'; throw new Zend_Session_SaveHandler_Exception ( "Configuration must define '" . self :: MODIFIED_COLUMN . "' which names the " . "session table last modification time column." ) ; } else if ( $ this -> _lifetimeColumn === null ) { /**
               * @see Zend_Session_SaveHandler_Exception
               */ // require_once 'Zend/Session/SaveHandler/Exception.php'; throw new Zend_Session_SaveHandler_Exception ( "Configuration must define '" . self :: LIFETIME_COLUMN . "' which names the " . "session table lifetime column." ) ; } else if ( $ this -> _dataColumn === null ) { /**
               * @see Zend_Session_SaveHandler_Exception
               */ // require_once 'Zend/Session/SaveHandler/Exception.php'; throw new Zend_Session_SaveHandler_Exception ( "Configuration must define '" . self :: DATA_COLUMN . "' which names the " . "session table data column." ) ; } }
docstring: Check for required session table columns
  
  @return void
  @throws Zend_Session_SaveHandler_Exception
docstring_tokens: Check for required session table columns