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BUG#54903 BINLOG statement toggles session variables

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When using BINLOG statement to execute rows log events, session variables
foreign_key_checks and unique_checks are changed temporarily.  As each rows
log event has their own special session environment and its own
foreign_key_checks and unique_checks can be different from current session
which executing the BINLOG statement. But these variables are not restored
correctly after BINLOG statement. This problem will cause that the following
statements fail or generate unexpected data.

In this patch, code is added to backup and restore these two variables.
So BINLOG statement will not affect current session's variables again.
This commit is contained in:
2010-11-28 17:43:36 +08:00
parent 86a4cf1116
commit abb201c131
4 changed files with 179 additions and 0 deletions
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53
mysql-test/extra/binlog_tests/binlog.test
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@@ -302,5 +302,58 @@ BINLOG '
SHOW BINLOG EVENTS;
DROP TABLE t1;
--echo
--echo # BUG#54903 BINLOG statement toggles session variables
--echo # ----------------------------------------------------------------------
--echo # This test verify that BINLOG statement doesn't change current session's
--echo # variables foreign_key_checks and unique_checks.
--echo
CREATE TABLE t1 (c1 INT KEY);
SET @@SESSION.foreign_key_checks= ON;
SET @@SESSION.unique_checks= ON;
--echo # INSERT INTO t1 VALUES (1)
--echo # foreign_key_checks=0 and unique_checks=0
BINLOG '
dfLtTBMBAAAAKQAAANcAAAAAABcAAAAAAAEABHRlc3QAAnQxAAEDAAE=
dfLtTBcBAAAAIgAAAPkAAAAAABcAAAAAAAcAAf/+AQAAAA==
';
SELECT * FROM t1;
--echo # Their values should be ON
SHOW SESSION VARIABLES LIKE "%_checks";
--echo
SET @@SESSION.foreign_key_checks= OFF;
SET @@SESSION.unique_checks= OFF;
--echo # INSERT INTO t1 VALUES(2)
--echo # foreign_key_checks=1 and unique_checks=1
BINLOG '
dfLtTBMBAAAAKQAAAKsBAAAAABcAAAAAAAEABHRlc3QAAnQxAAEDAAE=
dfLtTBcBAAAAIgAAAM0BAAAAABcAAAAAAAEAAf/+AgAAAA==
';
SELECT * FROM t1;
--echo # Their values should be OFF
SHOW SESSION VARIABLES LIKE "%_checks";
--echo # INSERT INTO t1 VALUES(2)
--echo # foreign_key_checks=1 and unique_checks=1
--echo # It should not change current session's variables, even error happens
--error 1062
BINLOG '
dfLtTBMBAAAAKQAAAKsBAAAAABcAAAAAAAEABHRlc3QAAnQxAAEDAAE=
dfLtTBcBAAAAIgAAAM0BAAAAABcAAAAAAAEAAf/+AgAAAA==
';
SELECT * FROM t1;
--echo # Their values should be OFF
SHOW SESSION VARIABLES LIKE "%_checks";
DROP TABLE t1;
disconnect fresh;