Code Spatter - Latest Comments in How To Use Triggers to Track Changes in MySQL

Re: How To Use Triggers to Track Changes in MySQL

Easy Set Pools — Thu, 29 Mar 2018 04:26:08 -0000

Thanks. I also looking for your new updates. Thanks for your help

Re: How To Use Triggers to Track Changes in MySQL

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Re: How To Use Triggers to Track Changes in MySQL

masterbuilt — Sun, 03 Dec 2017 08:32:22 -0000

This seems to work well from my side. Thanks. I also looking for your new updates. Thanks for your help

Re: How To Use Triggers to Track Changes in MySQL

Abiola Joseph Efficacy — Sun, 12 Mar 2017 08:01:22 -0000

Pla i av dis error on my phpmyadmin when importing, pls help me

CREATE TABLE IF NOT EXISTS `wpf8_commentmeta` (
`meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`comment_id` bigint(20) unsigned NOT NULL DEFAULT '0',
`meta_key` varchar(255) DEFAULT NULL,
`meta_value` longtext,
PRIMARY KEY (`meta_id`),
KEY `comment_id` (`comment_id`),
KEY `meta_key` (`meta_key`(191))
) TYPE=MyISAM AUTO_INCREMENT=96 ;
MySQL said: Documentation

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TYPE=MyISAM AUTO_INCREMENT=96' at line 19

Re: How To Use Triggers to Track Changes in MySQL

yepi250 — Mon, 08 Jul 2013 03:31:31 -0000

Different point of view from that post. Interesting to say the least.

Re: How To Use Triggers to Track Changes in MySQL

Guest — Thu, 01 Mar 2012 01:35:10 -0000

Thank you very much. Perfectly resolved my issue.

Re: How To Use Triggers to Track Changes in MySQL

L. — Mon, 08 Aug 2011 10:01:52 -0000

Quick word on this, I recently started working on an application using the mysql extension, and one of my first required steps was to change to mysqli, not having multiple queries possible is a huge problem, and clearly the mysql extension has quite a few other major flaws one should not attempt to live with. (and god bless postgresql, for it has only one extension, which works perfectly fine)

Re: How To Use Triggers to Track Changes in MySQL

Rick — Fri, 01 Apr 2011 10:56:22 -0000

As a bit of a follow up.... I guess the way that it is currently set up it would insert two times into the history_clients table if your UPDATE contained a change to the first AND last name. Maybe there is a reason for doing this, but I would think that reflecting BOTH changes in one row in the history_clients table would be the way to go. That is why I am wondering if we could somehow combine them.

Re: How To Use Triggers to Track Changes in MySQL

Rick — Fri, 01 Apr 2011 10:40:06 -0000

Hello,

I am wondering if there is a way to combine the 2 if statements in the MySQL trigger. Instead of having one to check and see if there has been a change to the first name and a SEPARATE check to see if there has been a change to the last name would it be possible to combine them?

I guess what I am asking is if MySQL can support a structure such as IF( A != B || C != D){... If "a" or "b" is the following... or even an IF (A != B && C != D){... If "a" and "b" do the following.

Thanks in advance,
Rick

Re: How To Use Triggers to Track Changes in MySQL

how to get pregnant fast — Thu, 03 Feb 2011 01:40:29 -0000

Thanks for sharing your mind with us.

Re: How To Use Triggers to Track Changes in MySQL

Ana30soberano — Fri, 22 Oct 2010 23:29:01 -0000

-using phpmyadmin actuly im using xampplite wuold u help me?

Re: How To Use Triggers to Track Changes in MySQL

Ana30soberano — Fri, 22 Oct 2010 23:27:57 -0000

-hai would u,,,create simple log in,,that if the username is wrong...then,,,the echo wuold be wrong pass and username?

Re: How To Use Triggers to Track Changes in MySQL

Ali — Sat, 01 May 2010 12:37:18 -0000

great to have found this site. I have used all search engines to find someone trying to update a table based on input changes. My issue was:
1- keep loading a table everyday.
2- data rows that is to load the table are repetitive. Not all of them change in value
3- once i use insert .... on duplicate key update . The table updates with the new information irrespective whether the values are equal or not. I am not sure why, but I have a timestamp field among the fields. And, i am passing a current_timestamp() function in the insert statement. This is needed to timestamp new records, and timestamp the duplicate key records if any of their values differ.
What I ended up getting, an updated timestamp that is always current. I lose track whether a real change exist in the values themselves. I think timestamp fields update with a timestamp irrespective whether other values change, that's because the timestamp field by itself changed. Enough to execute the update. This is the first caveat. What I really want is to leave the row unchanged based on the values i am checking and reset the timestamp to the old one.
so, the trigger helped me achieve that by putting an if then else statement. Similar to the above, yet introduced the else and SET new.timestamp = old.timestamp, new.counter=old.counter. My if checks all the values that might have changes with
IF NEW.VALUE<>OLD.VALUE OR NEW.VALUE_1 <> OLD.VALUE_1 for all values ...,
THEN INSERT INTO history_table SELECT * FROM table WHERE identifiers are =..
(The OLD.* didn't work.)
ELSE SET NEW.TIMESTAMP=OLD.TIMESTAMP, NEW.COUNTER=OLD.COUNTER

That did the magic, because it neutralized the new buffer to the old buffer and the update needn't to execute.

Hope that helps those who have the same issue.

Re: How To Use Triggers to Track Changes in MySQL

Anthony — Fri, 22 Jan 2010 06:58:24 -0000

perfect... exactly what I was looking for.

Re: How To Use Triggers to Track Changes in MySQL

Phani Kumar Varanasi — Thu, 12 Nov 2009 00:24:16 -0000

Yeah Dear, the concept you entered is so helpful, well good work.

Re: How To Use Triggers to Track Changes in MySQL

abhinavzone — Wed, 29 Jul 2009 12:57:23 -0000

Thank you very much!!! it saved my day

Re: How To Use Triggers to Track Changes in MySQL

Greg Allard — Mon, 20 Apr 2009 12:18:54 -0000

I don't think there is anyway to do it in the database, but you can still put the logic in your application. If you are using django, there are signals that will help get that done. http://docs.djangoproject.c... If you aren't then you will need to program it into your project in some other way.

Re: How To Use Triggers to Track Changes in MySQL

Sean — Mon, 20 Apr 2009 12:03:18 -0000

Does any way work as trigger in mysql 4.1? I know that triggers is supported from mysql 5.0
thanks for help

Re: How To Use Triggers to Track Changes in MySQL

Greg Allard — Fri, 31 Oct 2008 13:50:08 -0000

OLD and NEW are used on UPDATE triggers. OLD.col_names will access the data that is in the row of the database before the UPDATE query runs and NEW.col_names will access the data that the row will be updated to.

IF OLD.first_name != NEW.first_name

That checks if the UPDATE query is changing the information for first_name.

Re: How To Use Triggers to Track Changes in MySQL

mysqlearner — Fri, 31 Oct 2008 10:33:53 -0000

hi ,
please can u explain what is
OLD.first_name != NEW.first_name
are they table names?
I need to write atrigger to get the changed row and also how do i get the same query either insert,update or delete.
thanks in advance

Re: How To Use Triggers to Track Changes in MySQL

Greg Allard — Wed, 01 Oct 2008 10:06:05 -0000

php's mysql improved function is the only way I have tested doing multiple queries like this in a php script. Some PEAR libraries might be able to help also. Are you in a situation where you can't use mysqli?

Re: How To Use Triggers to Track Changes in MySQL

Dhiraj Das — Wed, 01 Oct 2008 08:50:12 -0000

Really help full. But, this is the way to execute multiple query using sqli, but what about mysql

Re: How To Use Triggers to Track Changes in MySQL

Greg Allard — Tue, 06 May 2008 19:07:14 -0000

Someone posted this on a link sharing site and there has been some discussion going on there. http://news.ycombinator.com...