mysql_errno

 int mysql_errno ([ resource $link_identifier ] ) 

説明

Returns the error number from the last MySQL function. Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_errno() to retrieve the error code. Note that this function only returns the error code from the most recently executed MySQL function (not including mysql_error() and mysql_errno()), so if you want to use it, make sure you check the value before calling another MySQL function.

戻り値

Returns the error number from the last MySQL function, or 0 (zero) if no error occurred.