Re^3: DBI Problem

[erix]

AutoCommit => 0

means you have to explicitly call $dbh->commit or your changes will be rolled back.

[Zarquav]

Yes! Thank you! I should've seen that sooner.. But I guess I figured that was fine because other queries have worked..

Now my new question is, how did it ever work for my previous calls?

Previously, I was running a script that did Create tables statements and Insert Statements.

I had to put the Insert statements first or I had the same problem..

So does that mean Create table statements force a commit to the DB even if Autocommit is 0 and I never explicitly called commit?

[erix]

So does that mean Create table statements force a commit to the DB even if Autocommit is 0 and I never explicitly called commit?

Try it and see. I suppose it makes sense; CREATE TABLE is DDL; INSERT is DML; and only some databases (PostgreSQL, for instance) know how to do transactional DDL.

Transactional DDL example:

# begin;  --> start a transaction 
create table testtable(id serial, c text);  -->  ... and create a tabl
+e
BEGIN
CREATE TABLE
# insert into testtable (c) values ('this will be short-lived');  --> 
+insert a row
INSERT 0 1
# select * from  testtable;   --> have a look
 id |            c
----+--------------------------
  1 | this will be short-lived
(1 row)

# rollback;  --> go back to initial state before begin
ROLLBACK
# select * from testtable;   --> now the table is gone...
ERROR:  relation "testtable" does not exist
LINE 1: select * from testtable;
                      ^

You get the idea...

Update: added a DDL transaction begin-create-rollback session.

[Zarquav]

I see. That would do it, yup..

The problem I had before was a loop where I was doing a Create followed by an Insert. In the end, all the tables were created, and all the inserts were done except the LAST one. Re-ordering the loop to do Insert then Create "solved" that problem, or rather concealed the fact I wasn't committing properly.. lol.

I'm using mySQL, which a quick Google search reveals will not do rollbacks on DDL queries.

Thanks again!

[poj]

..Create table statements force a commit..

In MySQL yes , see https://dev.mysql.com/doc/refman/5.7/en/implicit-commit.html

poj