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Draft patch that fixes and a sketches test cases for:

Browse Source 
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 cca59e83d7
commit 5ac769be68
20 changed files with 327 additions and 64 deletions
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4
sql/sql_class.cc
View File

@@ -320,7 +320,7 @@ int thd_sql_command(const THD *thd)
extern "C"
int thd_tx_isolation(const THD *thd)
{
return (int) thd->variables.tx_isolation;
return (int) thd->tx_isolation;
}
extern "C"
@@ -922,7 +922,7 @@ void THD::init(void)
update_lock_default= (variables.low_priority_updates ?
TL_WRITE_LOW_PRIORITY :
TL_WRITE);
session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
tx_isolation= (enum_tx_isolation) variables.tx_isolation;
update_charset();
reset_current_stmt_binlog_format_row();
bzero((char *) &status_var, sizeof(status_var));