Question

Just a quick question that no doubt someone out there will know the answer to.

I need to be able to do multiple insert/updates within a trigger. Every attempt ends with failure 🙁

DROP TRIGGER IF EXISTS `Insert_Article`//
CREATE TRIGGER `Insert_Article` AFTER INSERT ON `Article`
 FOR EACH ROW insert into FullTextStore (`Table`, `PrimaryKey`, `ColumnName`, `Data`, `Created`) values ('Article', NEW.ArticleID, 'Description', NEW.Description, UNIX_TIMESTAMP())
//

At the moment, the above simply inserts a row into a table when the parent table inserts. This works fine.

To get this to work with mulitple values I need to do

DROP TRIGGER IF EXISTS `Insert_Article`//
CREATE TRIGGER `Insert_Article` AFTER INSERT ON `Article`
 FOR EACH ROW insert into FullTextStore (`Table`, `PrimaryKey`, `ColumnName`, `Data`, `Created`)
select 'Article', NEW.ArticleID, 'Description', NEW.Description, UNIX_TIMESTAMP()
union
select 'Article', NEW.ArticleID, 'Keywords', NEW.Keywords, UNIX_TIMESTAMP()
//

But… There must be an easier way? When I try using ; to terminate each statement, it fails with

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL version for the right syntax to use near 'select 'Article', NEW.ArticleID, 'Keywords', 'NEW.Keywords, UNIX_TIMESTAMP())' at line 1

I can’t even get multiple update statements to work.

It’d be a great help if anyone could point out what i’m doing wrong?

Cheers

Gavin

Answer 1

From the docs: Create Trigger Syntax

trigger_stmt is the statement to
execute when the trigger activates. If
you want to execute multiple
statements, use the BEGIN … END
compound statement construct. This
also enables you to use the same
statements that are allowable within
stored routines

CREATE TRIGGER testref BEFORE INSERT ON test1
  FOR EACH ROW BEGIN
    INSERT INTO test2 SET a2 = NEW.a1;
    DELETE FROM test3 WHERE a3 = NEW.a1;
    UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;
  END;