On 15.09.2016 10:14, Tommi Prami wrote:
> Whole story here :
>
> https://plus.google.com/105626236962310493174/posts/3UZB71NjUhA
>
> Copy of message
> - - - - - - - - - - - - - - - -
> Is there a tool (or way) to debug database step by step.
>
> Now we have weird situation where delete from one database fails, on
> foreign key error, which sounds like it would be trivial thing, but seems
> so far it is not.
>
> I was just thinking that if it would be our application code I would be
> able to debug through all of the related code and see if there is the
> culprit or not.
>
> We suspect it has somethign to do with specific data on the rows. because
> some of them delete perfectly fine. This happens in this one database only.
> I've done backup restore for it, I ran gfix stuff on it. I even pumped the
> data in empty DB.
>
> it should be problem of database structure (trickers and such), data or the
> Firebird. and most likely it problem of first two.
>
> I was just thinking that is there an tool I could see step by step all the
> operations in the DB before the foreigh key error is raised. So I could
> step by step see the order the trickers and so fires and what they do.
>
> Or if someone at Firebird project could check if it is indeed the Firebird
> bug. I think we could send the DB, if it he/she keeps it safe and keeps it
> secret :)
>
> - - - -
>
> This is slightly scary. We dropped the FK and created it back again and it
> works like a charm. And friend checked that foreign key from the System
> tables and it seems to be exactly same.
>
> So could this be the bug or issue in firebird after all?
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What FB version do you use?
Modern firebird versions (like FB3 for example) produce good explanation
what FK failed and why.
For example (in employee.fdb):
SQL> delete from country where country = 'Japan';
Statement failed, SQLSTATE = 23000
violation of FOREIGN KEY constraint "INTEG_11" on table "JOB"
-Foreign key references are present for the record
-Problematic key value is ("COUNTRY" = 'Japan')
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