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Reading a field's default value from a trigger
I'm not sure if I use a wrong syntax or I found a bug. But I can't read a column's default value from a trigger.
The trigger just checks if the INSERT is trying to set a column to its default value:
CREATE TABLE `blog`
`created_by` CHAR(60) NOT NULL DEFAULT ''
CREATE TRIGGER `blog_default_created_by`
FOR EACH ROW
IF NEW.`created_by` = DEFAULT(NEW.`created_by`) THEN
SET NEW.`created_by` = USER();
But when I try to INSERT a row I get an error:
MariaDB [test]> INSERT INTO `blog` SET `created_by` = '';
ERROR 1364 (HY000): Field 'created_by' doesn't have a default value
This problem disappears if I replace DEFAULT(NEW.`created_by`) with '', so I'm not in troubles - but in theory a default value may change, so using DEFAULT() is a better practice.
The syntax I'm using could be wrong, but I've tried all the alternatives which seemed to me possible, and they didn't work: DEFAULT, DEFAULT(`created_by`), DEFAULT('created_by').
However I may still miss something, so I wanted to ask to the list before reporting this in JIRA.