MySql 5.0 - Trigger with Bussiness Logic

[crs27]

Hai,

I would like to know if i can include bussiness logic in Trigger.

For Example:

On a insert/update on a table(primary) i want to insert values to other table(secondary ).

A insert is done on a primary table only when their are no records present w.r.t the id .If the id is present in the table an update action is performed.
I will have to check if the id is present or not.But not getting to know how to implement it in trigger.

Thank You,
Sindhu

[Atli]

Hi.

Triggers can not use dynamic SQL statements. You would have to use a procedure or a function to do this.

Note that you can not call procedures or functions that use dynamic SQL statements from a trigger either.

I would recommend simply adding a "AddUser" or "AddClient" procedure to your database that you would call rather than adding data using the INSERT statement.
That way you can add whatever logic you want before you insert anything.