Rob,
>How do I generate an error condition within a Trigger?
>This might sound a strange request to some but I'm trying to do input
>validation on an insert/update query using a trigger. If the
validation fails
>I need to set an error condition such that MySQL will not
Insert/Ammend the
>data. Whilst I could force 'sensible' defaults in the event of validation
>failure I'd prefer to dump the entire record as being 'out of bounds'.
The
>manual states that when an error occurs within a trigger the table
data isn't
>modified which is exactly the behaviour I want. Unfortunately the manual
>doesn't state how to generate an error (safely).
Much of what is allowed within BEGIN ...END blocks in sprocs and sfuncs
is also allowed in such blocks in triggers, so you can write something
like ...
FOR EACH ROW BEGIN
DECLARE EXIT HANDLER FOR SQLSTATE '<some_value>' SET @err=<some_value>;
-- validation statements ...
SET @err=-1 ;
END
PB
-----
Rob Hall wrote:
How do I generate an error condition within a Trigger?
This might sound a strange request to some but I'm trying to do input
validation on an insert/update query using a trigger. If the validation fails
I need to set an error condition such that MySQL will not Insert/Ammend the
data. Whilst I could force 'sensible' defaults in the event of validation
failure I'd prefer to dump the entire record as being 'out of bounds'. The
manual states that when an error occurs within a trigger the table data isn't
modified which is exactly the behaviour I want. Unfortunately the manual
doesn't state how to generate an error (safely).
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