READ COMMITTED or READ UNCOMMITTED隔离级别下，不支持binlog的statement格式

mysql> insert into a values( a ,3);

ERROR 1665 (HY000): Cannot execute statement: impossible to write to binary log since BINLOG_FORMAT = STATEMENT and at least one table uses a storage engine limited to row-based logging. InnoDB is limited to row-logging when transaction isolation level is READ COMMITTED or READ UNCOMMITTED.