Обсуждение: Error in trigger

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Error in trigger

От
"Negandhi, Nishith"
Дата:
Hi,
All my tables in the database have "CreateDate" and "LastUpdateDate" columns. I need to create a trigger wherein on insert the "CreateDate" column is inserted with the current date. On Update the "LastUpdateDate" is inserted with the current date.
 
I tried the insert trigger as mentioned below:
 
CREATE FUNCTION "CreateDate_F"() RETURNS TRIGGER AS $CreateDate_T$
BEGIN
insert into "CreateDate" values (CURRENT_TIMESTAMP);
END; 
$CreateDate_T$ LANGUAGE plpgsql;
 
CREATE TRIGGER "Create_Date_T" AFTER INSERT ON "CreateDate"
FOR EACH STATEMENT EXECUTE PROCEDURE "CreateDate_F"();
 
However, when I run the insert on the said table, I get the following error:
 
ERROR:  stack depth limit exceeded
HINT:  Increase the configuration parameter "max_stack_depth".
CONTEXT:  SQL statement "insert into "CreateDate" values (CURRENT_TIMESTAMP)"
PL/pgSQL function "CreateDate_F" line 2 at SQL statement
 
Other than the above, is there any other way of doing this.???
Any suggestions please .???
 
Regards

Re: Error in trigger

От
Stephan Szabo
Дата:
On Thu, 18 Jan 2007, Negandhi, Nishith wrote:

> Hi,
> All my tables in the database have "CreateDate" and "LastUpdateDate"
> columns. I need to create a trigger wherein on insert the "CreateDate"
> column is inserted with the current date. On Update the "LastUpdateDate"
> is inserted with the current date.
>
> I tried the insert trigger as mentioned below:
>
> CREATE FUNCTION "CreateDate_F"() RETURNS TRIGGER AS $CreateDate_T$
> BEGIN
> insert into "CreateDate" values (CURRENT_TIMESTAMP);
> END;
> $CreateDate_T$ LANGUAGE plpgsql;
>
> CREATE TRIGGER "Create_Date_T" AFTER INSERT ON "CreateDate"
> FOR EACH STATEMENT EXECUTE PROCEDURE "CreateDate_F"();

I think you really want to be using a before row trigger and setting
NEW."CreateDate" in it if you want each row to have the appropriate
creation date (and a similar thing for the update date).