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Draft patch that fixes and a sketches test cases for:

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Bug#20837 Apparent change of isolation level during transaction,
Bug#46527 COMMIT AND CHAIN RELEASE does not make sense,
Bug#53343 completion_type=1, COMMIT/ROLLBACK AND CHAIN don't 
preserve the isolation level
Bug#53346 completion_type has strange effect in a stored 
procedure/prepared statement

Make thd->tx_isolation mean strictly "current transaction 
isolation level"
Make thd->variables.tx_isolation mean "current session isolation
level".
The current transaction isolation level is now established
at transaction start. If there was a SET TRANSACTION
ISOLATION LEVEL statement, the value is taken from it.
Otherwise, the session value is used.
A change in a session value, made while a transaction is active,
whereas still allowed, no longer has any effect on the
current transaction isolation level. This is an incompatible
change.
A change in a session isolation level, made while there is
no active transaction, overrides SET TRANSACTION statement,
if there was any.
Changed the impelmentation to not look at @@session.completion_type
in the parser, and thus fixed Bug#53346.
Changed the parser to not allow AND NO CHAIN RELEASE,
and thus fixed Bug#46527.
Changed the transaction API to take the current transaction
isolation level into account:
- BEGIN/COMMIT now do preserve the current transaction
isolation level if chaining is on.
- implicit commit, XA COMMIT or XA ROLLBACK or autocommit don't.
This commit is contained in:
Konstantin Osipov
2010-05-07 20:28:59 +04:00
parent 9e62cf67b3
commit 946fad3502
20 changed files with 327 additions and 64 deletions
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1
mysql-test/r/partition_innodb_semi_consistent.result
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@@ -18,6 +18,7 @@ set autocommit=0;
update t1 set a=10 where a=5;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
commit;
set session transaction isolation level read committed;
update t1 set a=10 where a=5;
select * from t1 where a=2 for update;