提交，保存点，回滚到PostgreSQL? [英] Commit, savepoint, rollback to in PostgreSQL?

问题描述

有人可以向我解释为什么此函数中的COMMIT返回EXCEPTION吗?

Can someone please explain to me why does COMMIT in this function returns EXCEPTION ?

DECLARE
  XNar CURSOR (forDATE Varchar) IS 
   SELECT NARUCENO, ISPORUKA_ID FROM XDATA_NARUDZBE 
   WHERE TO_CHAR(XDATA_NARUDZBE.DATUM, 'DD.MM.YYYY') = forDATE;
 LastDate  DATE;
 OutResult INTEGER;
 curNAR    NUMERIC;
 curISP    VARCHAR;
 RXNar     RECORD; 
BEGIN

 OutResult := 1;

 SELECT MAX(DATUM) INTO LastDate FROM XDATA_NARUDZBE;  

 FOR RXNar IN XNar(TO_CHAR(LastDate, 'DD.MM.YYYY')) LOOP

   IF (RXNar.NARUCENO <> 0) AND (RXNar.ISPORUKA_ID = 'R01') THEN
     UPDATE NARUDZBE SET ISPORUCENO = RXNar.NARUCENO 
      WHERE NARUDZBE.PP_ID  = RXNar.PP_ID
        AND NARUDZBE.ART_ID = RXNar.ART_ID
        AND NARUDZBE.ISPORUKA_ID = 'R01';
   END IF;

  END LOOP;

 COMMIT; <--- ????

 RETURN OutResult;

 EXCEPTION
  WHEN OTHERS THEN
   OUTRESULT := 0;
   RAISE;    
   RETURN OutResult;

END;    

为什么函数中存在EXCEPTION块时为什么不能使用ROLLBACK TO SavePoint?

and why I can not use ROLLBACK TO SavePoint when EXCEPTION block exists in function?

推荐答案

Frank Heikens回答说，您不能使用plpgsql提交plpgsql存储的函数/过程.但是，您可以通过使用dblink( http://www.postgresql.org/docs/9.0/interactive/contrib-dblink-connect.html )或其他存储过程语言，例如plperl(不受信任).查看此链接.

You can't commit in a plpgsql stored function/procedure using plpgsql as Frank Heikens answered. You can however work around this issue by using dblink(http://www.postgresql.org/docs/9.0/interactive/contrib-dblink-connect.html) or another store procedure language such as plperl(untrusted). Check out this link where this talked about.

http://postgresql.1045698.n5.nabble.com/Re-GENERAL-Transactions-within-a-function-body-td1992810.html

高级是使用以下方法之一打开新连接并对该连接发出单独的事务.在大多数情况下，由于打开一个新的连接，效果并不理想，但在大多数情况下可能效果很好.

The high level is you open a new connection using one of these methods and issue a separate transaction on that connection. Works for most cases not ideal because you are opening a new connection, but may work fine for most use cases.

这篇关于提交，保存点，回滚到PostgreSQL?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！