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Trigger MySQL not working


Trigger MySQL not working

By : user2956418
Date : November 22 2020, 10:56 AM
will be helpful for those in need In trigger you can directly access the fields of main table using new or old objects.
Try this:
code :
CREATE DEFINER=`root`@`%` TRIGGER `trg_add_role_type_to_auth_item` AFTER INSERT ON role_type 
FOR EACH ROW
BEGIN

INSERT INTO `auth_item` (`name`, `type`, `description`, `bizrule`, `data`)
VALUES (new.name, "2", new.name, NULL, NULL);
END;


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Why my trigger not working in MySQL?

Why my trigger not working in MySQL?


By : miniCruzer
Date : March 29 2020, 07:55 AM
it helps some times
code :
CREATE TRIGGER Capitalize BEFORE INSERT ON test
FOR EACH ROW
    SET NEW.str = UPPER(NEW.str);
MySQL Trigger not working very well

MySQL Trigger not working very well


By : jam08060
Date : March 29 2020, 07:55 AM
With these it helps I think you have been bitten by the anti-pattern called implicit join syntax.
It causes all sorts of problems.
code :
CREATE TRIGGER au_wp_ngg_gallery_each AFTER UPDATE ON wp_ngg_gallery FOR EACH ROW 
BEGIN  
   UPDATE wp_posts e SET e.post_modified = date(NEW.modified_date) WHERE e.ID IN (
     SELECT * FROM (
   SELECT a.id  
   FROM wp_posts p
   INNER JOIN wp_postmeta pm ON  (pm.post_id  = p.id AND pm.meta_key  = 'galeria_id')
   INNER JOIN wp_postmeta pm2 ON (pm2.post_id = p.id AND pm2.meta_key = 'galeria_id')
   /* not sure if the join on pm2 is needed or not */
   INNER JOIN wp_ngg_gallery ng ON (ng.gid = pm2.meta_value)
   WHERE 
      ng.gid = OLD.gid ) sub) subsubhack); 
END // 
trigger in MySQL not working

trigger in MySQL not working


By : Jason Carvalho
Date : March 29 2020, 07:55 AM
I wish this help you I have a database with university data. I want to create a trigger that ivolves the 2 tables University and Student. , You should change NEW.uni_id to NEW.uniId:
code :
CREATE TRIGGER s AFTER
INSERT ON student
FOR EACH ROW
  UPDATE university
  SET students=students+1
  WHERE uni_id=NEW.uniId
;
MySQL Trigger not entirely working

MySQL Trigger not entirely working


By : Alexandre Leal Jr
Date : March 29 2020, 07:55 AM
Does that help The expression in the IF won't evaluate to TRUE if LocationTrigger is null.
And LocationTrigger will be NULL if there are not rows in Boss that satisfy the condition in the WHERE clause.
code :
 BEGIN
    IF NOT ( NEW.location <=> 'Barcelona' ) THEN
       SIGNAL ...
    END IF;
 END
BEGIN
   DECLARE ls_location  VARCHAR(255) DEFAULT NULL;
   -- check if the value being inserted exists in a lookup table
   SELECT b.location INTO ls_location
     FROM Boss b
    WHERE b.location = NEW.location
    LIMIT 1 
   ;
   -- if we didn't find a match, ls_location will be NULL
   IF ls_location IS NULL THEN 
      SIGNAL ... 
   END IF;
END
 SELECT 0     = 1      AS c0
      , 0    <> 1      AS c1
      , 0     = NULL   AS c2
      , 0    <> NULL   AS c3
      , NULL  = NULL   AS c4
      , NULL <> NULL   AS c5
MySQL TRIGGER is not working with $wpdb->query when this trigger query is working well directly in mysql

MySQL TRIGGER is not working with $wpdb->query when this trigger query is working well directly in mysql


By : Erik
Date : March 29 2020, 07:55 AM
hope this fix your issue If you want to create a trigger through wordpress you can't use the $wpdb->query() method as it doesn't support trigger creation queries. In fact the Wordpress wpdb API doesn't support this at all.
You'll have to expose the underlying mysqli API and use mysqli_multi_query by doing this:
code :
mysqli_multi_query($wpdb->dbh, $your_trigger_query)
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