Question

I want to return error message when duplicate records occur, groupName is unique field in group table.

I make like this, how can I make error handleing whithout using mysql-get-diagnostics because the server I am working on is version 5.0.77-log.

 DELIMITER //
 CREATE PROCEDURE addNewGroup(IN groupName varchar(128), IN addedBy INT,OUT message varchar(128) )

 BEGIN


   insert IGNORE  into  `group`( `group_name`,`Date_time_ added`,`added_by`) values (groupName ,CURRENT_TIMESTAMP(),addedBy) ;


END //

DELIMITER ;

I want to return error message when duplication occur?

Answer 1

Try this method –

BEGIN
  INSERT IGNORE INTO table VALUES...;
  IF ROW_COUNT() = 0 THEN
    SET message = 'duplicate records occur';
  END IF;
END

ROW_COUNT() function returns the number of inserted rows for the last statement.

In MySQL 5.5. you can use SIGNAL statement to generate a warning.