MySQL Inserts record with NULL value in NOT NULL column

Question

Why does the first INSERT go through for table2. Note that table2.col_1 is NOT NULL. It doesn\'t insert NULL for col_1, but mysteriously converts the NULL value to an empty

Answer 1

You have MySQL's STRICT mode OFF. Turn it on and you'll get an error.

Otherwise you can test for those warnings with PDO via: http://php.net/manual/en/pdo.errorinfo.php

Answer 2

This behavior is well documented in MySQL docs . MySQL doc

If you are not using strict mode, then whenever you insert an “incorrect” value into a column, such as a NULL into a NOT NULL column or a too-large numeric value into a numeric column, MySQL sets the column to the “best possible value” instead of producing an error:,but the warning count is incremented

Answer 3

I have tried setting MySQL's STRICT mode OFF and didn't work for me (I even changed it to "my.ini" ).

What worked for me was a BEFORE INSERT TRIGGER

Basically you do:

CREATE TRIGGER triggerName BEFORE INSERT ON customer
FOR EACH ROW
BEGIN
    if new.`customerName` = '' then
    signal sqlstate '45000'
    SET MESSAGE_TEXT = 'Customer Name Cannot be Empty!';
    end if;
END

In the MESSAGE_TEXT you can add whatever text you want the error to show.

Hope it helps!

Most of it found here