Postgres Rollback On Error
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Postgres Current Transaction Is Aborted, Commands Ignored Until End Of Transaction Block
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Org.postgresql.util.psqlexception Error Current Transaction Is Aborted
Join them; it only takes a minute: Sign up Rollback after error in transaction up vote 4 down vote favorite This should be an easy one for those familiar with Postgresql: My application issues a begin_work, does a number of operations, and then issues a commit. The operations and the commit are wrapped inside a try-catch block, whose catch
Psycopg2 Rollback
statement performs a rollback. Assumption: if an error occurs during a SQL operation, Postgresql will automatically rollback the transaction, and therefore my rollback will be redundant but harmless. Is this assumption correct? (The reason why I'm rollbacking anyway: just in case an exception unrelated to a SQL operation ocurs.) postgresql share|improve this question asked Apr 4 '13 at 15:19 Jon Smark 890818 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted If an error occurs, PostgreSQL does not actually rollback the transaction. It fails every subsequent statements with an error. You can try this out in the client. You need to execute rollback before any statements can be executed successfully. In the case that you close the connection and start a new one, this is of little consequence. However, if you retain the connection and run other statements which you expect to execute successfully, it will not work. share|improve this answer answered Apr 4 '13 at 15:33 drone.ah 858926 So, it seems my assumption was w
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Postgres Rollback Transaction
Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each postgres sql state: 25p02 other. Join them; it only takes a minute: Sign up Transaction roll back not working in Postgresql up vote 0 down vote favorite I am working on PostgreSQL 9.1.4 . I am inserting the data into 2 tables its http://stackoverflow.com/questions/15815275/rollback-after-error-in-transaction working nicely. I wish to apply transaction for my tables both table exist in same DB. If my 2nd table going fail on any moment that time my 1 st table should be rollback. I tried the properties in "max_prepared_transactions" to a non zero value in /etc/postgres/postgres.conf. But Still Transaction roll back is not working. sql postgresql postgresql-9.1 phppgadmin php-pgsql share|improve this question edited Jan 15 '14 at 6:07 Craig Ringer 134k19224307 asked Jan 15 '14 at 5:57 http://stackoverflow.com/questions/21130094/transaction-roll-back-not-working-in-postgresql Kanchetianeel 4911 4 This doesn't make much sense. Please show the code you are running, and any error messages. –Craig Ringer Jan 15 '14 at 6:06 1 Maybe you didn't turn off autocommit? –a_horse_with_no_name Jan 15 '14 at 6:52 @a_horse_with_no_name: your comment probably was valid at the time, but from my understanding, turning off autocommit now is neither needed nor possible: stackoverflow.com/a/17936997 –ssc Sep 30 at 16:05 add a comment| 3 Answers 3 active oldest votes up vote 1 down vote Probably you didn't started transaction. Please, try BEGIN; INSERT INTO first_table VALUES(10); -- second insert should fail INSERT INTO second_table VALUES(10/0); ROLLBACK; share|improve this answer answered Jan 15 '14 at 13:22 Pavel Stehule 14.7k22230 add a comment| up vote 0 down vote in postgresql you cannot write commit or roll back explicitly within a function. I think you could have use a begin end block just write it simple BEGIN; insert into tst_table values ('ABC'); Begin insert into 2nd_table values ('ABC'); EXCEPTION when your_exception then ROLL BACK; END; END; share|improve this answer answered Jan 17 '14 at 11:07 smn_onrocks 8451618 add a comment| up vote -3 down vote I think it would be helpfull create proc DataInsertInTable as begin tran insert into Table1 values('Table1Data','XYZ') if(@@ERROR <>0) begin rollback tran; return 0 end insert into Table2 values('Table2Data','ABC') if(@@ERROR <>0) begin rollback tran; return 0 end commit
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take to get it running on PostgreSQL. I just discovered one rather glaring difference between PostgreSQL and most other DBMSs.Here is an example to demonstrate:I have a table: my_table, with the following row:----------------|id|val|----------------|3|row3|----------------Let's say I want to make sure I have rows for ids 1 through 5 in the table. This is a case where I would use MySQL's 'INSERT IGNORE' statement, which doesn't exist in PostgreSQL. I have at least two options: I can create a stored procedure to do it, or I can do it in code.Let's say I create a procedure:CREATE OR REPLACE FUNCTION my_proc() RETURNS void AS$$BEGINFOR i IN 1..5 LOOPBEGININSERT INTO my_table(id, val) VALUES (i, 'row ' || i);EXCEPTION WHEN unique_violation THEN-- do nothingEND;END LOOP;END;$$ LANGUAGE plpgsql;All is well, this type of exception handling is standard in stored procedures. Here's the entire test:postgres=#createdatabasemy_test;CREATEDATABASEpostgres=#\cmy_test;Youarenowconnectedtodatabase"my_test".my_test=#createtablemy_table(idINTEGERPRIMARYKEY,valVARCHAR(64));NOTICE:CREATETABLE/PRIMARYKEYwillcreateimplicitindex"my_table_pkey"fortable"my_table"CREATETABLEmy_test=#CREATEORREPLACEFUNCTIONmy_proc()RETURNSvoidASmy_test-#$$my_test$#BEGINmy_test$#FORiIN1..5LOOPmy_test$#BEGINmy_test$#INSERTINTOmy_table(id,val)VALUES(i,'row'||i);my_test$#EXCEPTIONWHENunique_violationTHENmy_test$#--donothingmy_test$#END;my_test$#ENDLOOP;my_test$#END;my_test$#$$LANGUAGEplpgsql;CREATEFUNCTIONmy_test=#insertintomy_tablevalues(3,'row3');INSERT01my_test=#select*frommy_table;id|val----+-------3|row3(1row)my_test=#selectmy_proc();my_proc---------(1row)my_test=#select*frommy_table;id|val----+-------3|row31|row12|row24|row45|row5(5rows)my_test=#Now here's the twist - you can't (really) do the same thing outside of a stored procedure (without using savepoints, as I'll get to later). Here's what happens:my_test=#\setAUTOCOMMITOFFmy_test=#deletefrommy_tablewhereid<>3;DELETE4my_test=#commit;COMMITmy_test=#insertintomy_tablevalues(1,'row1');INSERT01my_test=#insertintomy_tablevalues(2,'row2');INSERT01my_test=#insertintomy_tablevalues(3,'row3');ERROR:duplicatekeyvalueviolatesuniqueconstraint"my_table_pkey"my_test=#insertintomy_tablevalues(4,'row4');ERROR:currenttransactionisaborted,commandsignoreduntilendoftransactionblockmy_test=#insertintomy_tablevalues(5,'row5');ERROR:currenttransactionisaborted,commandsignoreduntilendoftransactionblockmy_test=#commit;ROLLBACKmy_test=#select*frommy_table;id|val----+-------3|row3(1row)PostgreSQL forces you to rollback a transaction that hits any error. There is no excepti