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CREATE TABLE t1 (i int unique) ENGINE=innodb;
reset master;
begin;
insert into t1 values (1),(2);
*** the following UPDATE query wont generate any updates for the binlog ***
update t1 set i = 3 where i < 3;
ERROR 23000: Duplicate entry '3' for key 'i'
commit;
*** Results of the test: the binlog must have only Write_rows events not any Update_rows ***
show binlog events from <binlog_start>;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 # Query # # BEGIN
master-bin.000001 # Table_map # # table_id: # (test.t1)
master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Xid # # COMMIT /* XID */
delete from t1;
reset master;
begin;
insert into t1 values (1),(2);
*** the following UPDATE query wont generate any updates for the binlog ***
insert into t1 values (3),(4),(1),(2);
ERROR 23000: Duplicate entry '1' for key 'i'
commit;
*** Results of the test: the binlog must have only one Write_rows event not two ***
show binlog events from <binlog_start>;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 # Query # # BEGIN
master-bin.000001 # Table_map # # table_id: # (test.t1)
master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Xid # # COMMIT /* XID */
drop table t1;
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