SQL Trigger errors - mysql

I'm trying to create a trigger like so:
CREATE TRIGGER `table_insert` AFTER INSERT ON `user`
FOR EACH
ROW BEGIN
INSERT INTO
VALUES log (username,action)
NEW.name, 'successful addition'
);
END ;
I'm just looking to experiment with triggers but i get many errors no matter what I do, when i Try and work it I might get an error like so:
SUPER privilege needed for this operation
Check syntax
Could some1 who has any knowledge please show me how to add a trigger?
I am using PHPmyAdmin to work on my mysql database hosted on a blacknight server.


Is new.name --> name correct column? or username?
IF not:
Insert into log(username,action)
values(
new.name,
'successful addition'
)

Related

Using a trigger to automatically assign a value to specific column on a new insert

I'm struggling to find proper information on SQL Triggers.
My previous question got removed for it not being specific enough so hopefully this will do better.
I am trying to create a trigger that will assign RoleID 1 to every newly inserted row to my users table.
But I can't seem to figure it out.
AFTER INSERT on users
on EACH ROW
insert into users.RoleID values(1);
This doesn't seem to work.
And the examples and or information regarding triggers all focus on alerts or sending emails after an insert/drop or update.
Can it actually be done?
Any help would be much appreciated.
Cheers!

It looks like you aren't creating you sql trigger with the correct keyword.
Try this
drop trigger if exists before_insert_users;
DELIMITER $$
CREATE TRIGGER before_insert_users
BEFORE INSERT ON users
FOR EACH ROW
BEGIN
SET NEW.RoleID = 1;
END$$
DELIMITER ;
Note: RoleID will need to actually be a column on your table for this to work.
However, a trigger is not the best way to do this... See this SO post : Add a column with a default value to an existing table in SQL Server

Tracking database changes

Does anyone here can suggest a way to track database changes that were made through wordpress? For example I add a menu in wordpress, how can I keep track of this changes in database?
I use mysql
I tried searching and I only find toad and mysqldiff but still no luck. I also tried activating tracking for mysql but it only records changes that were made through phpmyadmin

You can create a trigger function in your mysql database. This function could copy the row before any UPDATE or INSERT statement into a separate table.
http://dev.mysql.com/doc/refman/5.7/en/create-trigger.html
BUT! Write a small IF check into your procedure so that you can disable it. Otherwise you will have a hard time when importing data through sql scripts during development.
A sample:
DROP TRIGGER IF EXISTS `backup`;
DELIMITER //
CREATE TRIGGER `backup`
BEFORE UPDATE
ON `sourceTable` FOR EACH ROW
BEGIN
IF #disableTriggers <> 1 THEN
INSERT INTO `backupTable` (col1,col2,col3) VALUES (OLD.col1,OLD.col2,OLD.col3)
END IF;
END;
//
DELIMITER ;

Can I create a trigger in mysql schema in phpmyadming

When I ran the same query in different databases, it works successfully. But in mysql schem it gives error:
#trigger can not be created on system table
My query is:
delimiter //
CREATE TRIGGER `invite` AFTER INSERT ON `Invite_page`
FOR EACH ROW BEGIN
Insert into userpost(userid,url,title,preview,sentiment,time) values(NEW.userid,NEW.url,NEW.title,NEW.preview,NEW.sentiment,NEW.time);
Insert into urlcontent(userid,url,title,preview,sentiment,time) values(NEW.userid,NEW.url,NEW.title,NEW.preview,NEW.sentiment,NEW.time);
END
//
delimiter ;
If I can't, then how can I solve this instead?
UPDATE:
actual error:
#1465 - Triggers can not be created on system tables

Try this
DELIMITER $$
CREATE TRIGGER `invite` AFTER INSERT ON `Invite_page`
FOR EACH ROW
BEGIN
Insert into userpost(userid,url,title,preview,sentiment,time) values(NEW.userid,NEW.url,NEW.title,NEW.preview,NEW.sentiment,NEW.time);
Insert into urlcontent(userid,url,title,preview,sentiment,time) values(NEW.userid,NEW.url,NEW.title,NEW.preview,NEW.sentiment,NEW.time);
END$$
DELIMITER ;

Under the "Restrictions for triggers" section in http://dev.mysql.com/doc/refman/5.5/en/stored-program-restrictions.html you can read:
Triggers are not permitted on tables in the mysql database.
BTW, are you using the mysql schema to store data? This is (usually) a very bad idea and probably you need to rethink your setup.

SQL server 2008 trigger before insert

I am very new to SQL and sorry for asking this is very primary knowledge. My issue as follow.
I have a table called Group and minimumVal and maximumVal are two columns. minimumVal always should be less than maximumVal. I want to check this before inserting a new record to the table. If this condition failed data should not inserted into the DB.
So as per my understanding I though of having a trigger but have no idea how to write this.
This is what I write so far;
CREATE TRIGGER tr_Group
ON Table_Group
for INSERT
AS
????
Please advise me.

I recommend you use check constraints for this:
ALTER TABLE dbo.Table_Group ADD CONSTRAINT CK_Group
CHECK (minimumVal < maximumVal)
If you still want to use triggers, then you need an INSTEAD OF trigger:
CREATE TRIGGER tr_Group ON Table_Group
INSTEAD OF INSERT
AS
BEGIN
SET NOCOUNT ON
INSERT INTO dbo.Table_Group
SELECT *
FROM INSERTED
WHERE minimumVal < maximumVal
END

How to configure binlog to get User-Information?

I need to get an auditrail in mysql; is there a way to configure the binary log to get not only the changes, also the user, (connection) who made this change? Or do I have to use mySQL Proxy?
TIA
Peter

I don't think its possible to have the binlog show connection info. My approach is to set triggers in the database that log to audit tables. For example, here is one from work:
CREATE TRIGGER whatever_audit_INSERT
AFTER INSERT ON whatever FOR EACH ROW
BEGIN
INSERT INTO whatever_audit(
audit_when_start, audit_who_start, col1, col2
) VALUES (
now(), #app_user, new.col1, new.col2
)
END
That's from memory; hopefully I got the syntax right...