/**
	 * Turns on (false) or off (true) the automatic generation and sending
	 * of a "we're sorry, but there has been a database error" page on
	 * database errors. Default is on (false). When turned off, the
	 * code should use lastErrno() and lastError() to handle the
	 * situation as appropriate.
	 *
	 * Do not use this function outside of the Database classes.
	 *
	 * @param $ignoreErrors bool|null
	 *
	 * @return bool The previous value of the flag.
	 */
	public function ignoreErrors( $ignoreErrors = null ) {
		return wfSetBit( $this->mFlags, DBO_IGNORE, $ignoreErrors );
	}

 /**
  * Turns on (false) or off (true) the automatic generation and sending
  * of a "we're sorry, but there has been a database error" page on
  * database errors. Default is on (false). When turned off, the
  * code should use wfLastErrno() and wfLastError() to handle the
  * situation as appropriate.
  */
 function ignoreErrors($ignoreErrors = NULL)
 {
     return wfSetBit($this->mFlags, DBO_IGNORE, $ignoreErrors);
 }