MySQL需要帮助设置触发器

Question

I am trying to set up a TRIGGER to clear empty strings before INSERT . Not rocket science but I can't find the error in my syntax!

Here is the TRIGGER itself

USE `ga_abtest_logging`;
DELIMITER $$
CREATE TRIGGER avoid_empty
    BEFORE INSERT ON daily_analytics
        FOR EACH ROW
        BEGIN
            IF profileID = '' 
                THEN SET profileID = NULL
            END IF;
        END$$

Here is what workbench is showing:

On hover over the END IF it reads syntax error, unexpected END, expecting ';'

Could I have a problem with the settings on my DB? I have gone through the MySQL docs and I think the trigger looks right! Does anyone see anything obviously wrong?

Answer 1

You should make a few changes:

• Use the NEW. prefix when referencing a column value
• Add a semi-colon at the end of the line where you set the value

For example:

DELIMITER $$

CREATE TRIGGER tr_b_ins_daily_analytics BEFORE INSERT ON daily_analytics FOR EACH ROW BEGIN
  IF (NEW.profileID = '')
  THEN
    SET NEW.profileID = NULL;
  END IF;
END $$

DELIMITER ;

Answer 2

The code below should work.

DELIMITER $$  
CREATE TRIGGER avoid_empty  
    BEFORE INSERT ON daily_analytics  
        FOR EACH ROW  
        BEGIN  
            IF NEW.profileID = ''  
                THEN SET NEW.profileID = NULL;  
            END IF;  
        END;$$  
DELIMITER ;