Re: SQL procedures

2017-11-08 15:31 GMT+01:00 Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>:

>
>
> 2017-11-08 15:23 GMT+01:00 Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)
> com>:
>
>> On 10/31/17 16:50, Pavel Stehule wrote:
>> > Not sure if disabling RETURN is good idea. I can imagine so optional
>> > returning something like int status can be good idea. Cheaper than
>> > raising a exception.
>>
>> We could allow a RETURN without argument in PL/pgSQL, if you just want
>> to exit early. That syntax is currently not available, but it should
>> not be hard to add.
>>
>> I don't understand the point about wanting to return an int. How would
>> you pass that around, since there is no declared return type?
>>
>
> We can create auto session variable STATUS. This variable can be 0 if
> procedure was returned without explicit RETURN value. Or it can hold
> different value specified by RETURN expr.
>
> This value can be read by GET DIAGNOSTICS xxx = STATUS
>
> or some similar.
>

The motivation is allow some mechanism cheaper than our exceptions.

Regards

Pavel

>
>
>
>> --
>> Peter Eisentraut http://www.2ndQuadrant.com/
>> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
>>
>
>