Re: Transactions and SavePoints - Mailing list pgsql-odbc
From | Marko Ristola |
---|---|
Subject | Re: Transactions and SavePoints |
Date | |
Msg-id | 4315DB11.8050300@kolumbus.fi Whole thread Raw |
In response to | Re: Transactions and SavePoints (Carlos Henrique Reimer <carlosreimer@yahoo.com.br>) |
Responses |
Re: Transactions and SavePoints
(Cleber Nardelli <clebernardelli@gmail.com>)
|
List | pgsql-odbc |
Hi I tried to write SAVEPOINT SQL support into PsqlODBC in Summer. I was able to implement some suport for savepoint creation, savepoint rollback and savepoint RELEASE. I didn't understand, how the query results should behave at savepoint rollbacks. You can find more information about my thoughts about savepoint implementation on this list ealier this year, or with Google. Main design issue was, that SAVEPOINT tracking must be implemented into PSQLODBC. That's what I implemented: - Linked list of all defined savepoints. - Maintain the list during SAVEPOINT maintenance functions. Savepoint command parsing speed was 600000 commands per second, that I wrote (UTF-8). With UCS-4 , without a state machine, it was 300000 commands per second. The subsystem's speed was okay. I implemented a full PostgreSQL SQL SAVEPOINT support with the Bison/Flex parser, because it is easy, but that part is not at all easy to integrate into an existing PsqlODBC driver. Are you interested in a patch for the mergeable part of the savepoint support? Regards, Marko Ristola Carlos Henrique Reimer wrote: > Is there a ODBC flavor than can implement ROLLBACK TO SAVEPOINT? > > Marko Ristola wrote: > > Unfortunately SAVEPOINTs are not implemented in PsqlODBC yet. > > > > > >ROLLBACK TO SAVEPOINT -case is easy to fix, but the full > >implementation is hard to make correctly for psqlodbc, at least for me. > > > >Marko Ristola > > > >>Cleber Nardelli wrote: > >> > >> > >>Hello. > >>I am using the Driver odbc for access to postgresql. I have a > referring problem to the cancellation of the transaction when > >>some error > >>is found at the moment of the execution of the same one. I try to > execute this sql command: > >> > >> > >>BEGIN TRANSACTION; > >> DELETE FROM TABL1 WHERE ID = 1; > >> INSERT INTO TABL1 VALUES (1,1); > >> SAVEPOINT SVPT; > >> INSERT INTO TABL1 VALUES (1,1); > >> ROLLBACK TO SAVEPOINT SPVT; > >>COMMIT; > >> > >>When I try to insert as register it accuses to error with key > duplicate. Ok. But I do not want to cancel the transaction I I need to > only continue > >>with the same one skirting this error. For this reason I am using > >>SavePoints but it generates the error: > >>"ERROR: ROLLBACK TO SAVEPOINT may only be used in transaction blocks" > >> > >>Necessary of the your help. I thank > >> > >>Yours truly > >> > > ------------------------------------------------------------------------ > Yahoo! Acesso Grátis > <%20http://us.rd.yahoo.com/mail/br/taglines/*http://br.acesso.yahoo.com/>: > Internet rápida e grátis. Instale o discador agora! > <%20http://us.rd.yahoo.com/mail/br/taglines/*http://br.acesso.yahoo.com/>
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