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This will create an infinite loop, which does not work.How can I store the update time in the corresponding column?He's created enterprise specifications, websites and online applications for companies and organisations including the UK Parliament, the European Parliament, the Department of Energy & Climate Change, Microsoft, and more.He's written more than 1,000 articles for Site Point and you can find him @craigbuckler.To create the full trigger code we must change delimiter to something else — such as $$. It determines whether the deleted flag is set, sets the @changetype variable accordingly, and inserts a new record into the audit table: CREATE TRIGGER `blog_after_insert` AFTER INSERT ON `blog` FOR EACH ROW BEGIN IF NEW.deleted THEN SET @changetype = 'DELETE'; ELSE SET @changetype = 'NEW'; END IF; INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, @changetype); END$$ DELIMITER $$ CREATE TRIGGER `blog_after_update` AFTER UPDATE ON `blog` FOR EACH ROW BEGIN IF NEW.deleted THEN SET @changetype = 'DELETE'; ELSE SET @changetype = 'EDIT'; END IF; INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, @changetype); END$$ DELIMITER ; If you enjoyed reading this post, you’ll love Learnable; the place to learn fresh skills and techniques from the masters.Members get instant access to all of Site Point’s ebooks and interactive online courses, like PHP & My SQL Web Development for Beginners.Two tables are required: CREATE TABLE `blog` ( `id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT, `title` text, `content` text, `deleted` tinyint(1) unsigned NOT NULL DEFAULT '0', PRIMARY KEY (`id`), KEY `ix_deleted` (`deleted`) ) ENGINE=Inno DB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='Blog posts'; The following SQL creates the `audit` table.
The first My SQL command we’ll issue is a little unusual: Our trigger body requires a number of SQL commands separated by a semi-colon (;).
For example, you can have a trigger activate before each row that is inserted into a table or after each row that is updated.
My SQL triggers activate only for changes made to tables by SQL statements.
I wish to use a trigger because there are many columns in the table.
If I try to set the update time manually, I would need to modify many queries.
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