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Re: Problem with stored procedure and nested transactions

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On 10/30/18 7:03 AM, p.pierotti@xxxxxxx wrote:
Hi everyone,

I have problems with stored procedures introduced in version 11.

I do not understand how to create a nested transaction, in this semplified example:

*create**or**replace**procedure*tst_prc(*inout*p_cod *text*) *language*plpgsql *as**$procedure$*

*begin*

p_cod := 'a';

*begin*

*update*aziende *set*mail = 'asd@xxxxxxx'*where*id = 11; --1st update

*begin*

*update*aziende *set*telefono = '0123456789'*where*id = 11; --2nd update

*commit*;

*raise**notice*'Inner';

*end*;

*update*aziende *set*telefono = '089'*where*id = 11; --3rd update

--commit;

*rollback*;

*raise**notice*'Outer';

*end*;

p_cod := 'b';

*end*;

*$procedure$*

The third update goes, rightly, in rollback; the problem is that the first 2 are committed.

I thought that the “BEGIN/END” block was used to create new transactions and that each of them could be managed individually.

https://www.postgresql.org/docs/10/static/plpgsql-structure.html

"It is important not to confuse the use of BEGIN/END for grouping statements in PL/pgSQL with the similarly-named SQL commands for transaction control. PL/pgSQL's BEGIN/END are only for grouping; they do not start or end a transaction. See Section 43.8 for information on managing transactions in PL/pgSQL. Also, a block containing an EXCEPTION clause effectively forms a subtransaction that can be rolled back without affecting the outer transaction. For more about that see "


What am I doing wrong?

Best regards.

**

*Paolo Pierotti *

**


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Adrian Klaver
adrian.klaver@xxxxxxxxxxx




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