BUG#15406: Adding support for transactions to blackhole.

Now when rolling back a transaction on a blackhole table,
the transaction will not be written to the binlog.


sql/ha_blackhole.h:
  Added support for transactions
mysql-test/t/blackhole.test:
  Added a test for transaction support
mysql-test/r/blackhole.result:
  updated test results for transaction support

mysql-test/r/blackhole.result

@@ -110,16 +110,41 @@ master-bin.000001	#	Format_desc	1	#	Server ver: VERSION, Binlog ver: 4
 master-bin.000001	#	Query	1	#	use `test`; drop table t1,t2
 master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int) engine=blackhole
 master-bin.000001	#	Query	1	#	use `test`; delete from t1 where a=10
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; update t1 set a=11 where a=15
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; insert into t1 values(1)
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; insert ignore into t1 values(1)
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; replace into t1 values(100)
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; create table t2 (a varchar(200)) engine=blackhole
 master-bin.000001	#	Begin_load_query	1	#	;file_id=1;block_len=581
 master-bin.000001	#	Execute_load_query	1	#	use `test`; load data infile '../../std_data/words.dat' into table t2 ;file_id=1
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; alter table t1 add b int
 master-bin.000001	#	Query	1	#	use `test`; alter table t1 drop b
 master-bin.000001	#	Query	1	#	use `test`; create table t3 like t1
 master-bin.000001	#	Query	1	#	use `test`; insert into t1 select * from t3
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 master-bin.000001	#	Query	1	#	use `test`; replace into t1 select * from t3
+master-bin.000001	#	Query	1	#	use `test`; COMMIT
 drop table t1,t2,t3;
+reset master;
+create table t1 (a int) engine=blackhole;
+set autocommit=0;
+start transaction;
+insert into t1 values(1);
+commit;
+start transaction;
+insert into t1 values(2);
+rollback;
+set autocommit=1;
+show binlog events;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Format_desc	1	#	Server ver: VERSION, Binlog ver: 4
+master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int) engine=blackhole
+master-bin.000001	#	Query	1	#	use `test`; BEGIN
+master-bin.000001	#	Query	1	#	use `test`; insert into t1 values(1)
+master-bin.000001	#	Query	1	#	use `test`; COMMIT

mysql-test/t/blackhole.test

@@ -127,3 +127,20 @@ show binlog events;
 drop table t1,t2,t3;
 
 # End of 4.1 tests
+
+# Test that a transaction which is rolled back does not go into binlog
+# and that a transaction which is committed does
+
+reset master;
+create table t1 (a int) engine=blackhole;
+set autocommit=0;
+start transaction;
+insert into t1 values(1);
+commit;
+start transaction;
+insert into t1 values(2);
+rollback;
+set autocommit=1;
+--replace_result $VERSION VERSION
+--replace_column 2 # 5 #
+show binlog events;

sql/ha_blackhole.h

@@ -84,4 +84,5 @@ class ha_blackhole: public handler
   THR_LOCK_DATA **store_lock(THD *thd,
                              THR_LOCK_DATA **to,
                              enum thr_lock_type lock_type);
+  bool has_transactions() { return 1; }
 };