Обсуждение: Stop execution without ERROR

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Stop execution without ERROR

От
James Sewell
Дата:
Hello all,

Let's say I'm running the following SQL script via psql -f

BEGIN
\set ON_ERROR_STOP
SELECT myFunction();
CREATE TABLE x(id int);
END;

Is there anything I can do in myFunction which will:

a) Stop execution of the script so that x will not be created
b) Not throw an error (return value of 0, no ERROR in output)

I am currently using an EXCEPTION, which satisfies a, but not b.

Cheers,

James Sewell,
PostgreSQL Team Lead / Solutions Architect
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Level 2, 50 Queen St, Melbourne VIC 3000

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Re: Stop execution without ERROR

От
David Johnston
Дата:
james.sewell wrote
> Hello all,
>
> Let's say I'm running the following SQL script via psql -f
>
> BEGIN
> \set ON_ERROR_STOP
> SELECT myFunction();
> CREATE TABLE x(id int);
> END;
>
> Is there anything I can do in myFunction which will:
>
> a) Stop execution of the script so that x will not be created
> b) Not throw an error (return value of 0, no ERROR in output)
>
> I am currently using an EXCEPTION, which satisfies a, but not b.

No.  To accomplish that kind of flow control requires that you use a
procedural language.  pl/pgsql can serve that purpose.  You can use a
function or a DO block to implement.  Or code a shell script.

David J.





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Re: Stop execution without ERROR

От
Karsten Hilbert
Дата:
On Wed, Oct 16, 2013 at 12:04:53PM +1100, James Sewell wrote:

> Let's say I'm running the following SQL script via psql -f
>
> BEGIN
> \set ON_ERROR_STOP
> SELECT myFunction();
> CREATE TABLE x(id int);
> END;
>
> Is there anything I can do in myFunction which will:
>
> a) Stop execution of the script so that x will not be created
> b) Not throw an error (return value of 0, no ERROR in output)
>
> I am currently using an EXCEPTION, which satisfies a, but not b.

Any reason you aren't conditionally CREATEing TABLE inside myFunction() ?

Karsten
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