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Top Forums Programming MYSQL - trigger update on record insert or update Post 302888668 by barrydocks on Sunday 16th of February 2014 04:52:24 PM
Old 02-16-2014
MYSQL - trigger update on record insert or update

Right I have a MYSQL database with table1 with 3 columns, colA, colB and colC. I want to combine the data in the 3 columns into a 4th column names col_comb. Here's the SQL command that works:
Code:
UPDATE table1 SET `col_comb` = CONCAT( `colA` , ' - ', `colB` , ', ', `colC` );

So now I want this to happen automaitically if a record is either inerted or updated in table1. I have tried setting up a trigger but it is not possible to use UPDATE in a trigger, here's an example:
php - MySql Error: Can't update table in stored function/trigger because it is already used by statement which invoked this stored function/trigger - Stack Overflow

Any suggestions on how to achieve this?

Thanks
 

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ALTER 
TRIGGER(7) SQL Commands ALTER TRIGGER(7) NAME
ALTER TRIGGER - change the definition of a trigger SYNOPSIS
ALTER TRIGGER name ON table RENAME TO newname DESCRIPTION
ALTER TRIGGER changes properties of an existing trigger. The RENAME clause changes the name of the given trigger without otherwise changing the trigger definition. You must own the table on which the trigger acts to be allowed to change its properties. PARAMETERS
name The name of an existing trigger to alter. table The name of the table on which this trigger acts. newname The new name for the trigger. NOTES
The ability to temporarily enable or disable a trigger is provided by ALTER TABLE [alter_table(7)], not by ALTER TRIGGER, because ALTER TRIGGER has no convenient way to express the option of enabling or disabling all of a table's triggers at once. EXAMPLES
To rename an existing trigger: ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs; COMPATIBILITY
ALTER TRIGGER is a PostgreSQL extension of the SQL standard. SEE ALSO
ALTER TABLE [alter_table(7)] SQL - Language Statements 2010-05-14 ALTER TRIGGER(7)
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