MySQL replication case 一则
转载：http://www.vmcd.org/2013/09/mysql-replication-case-%E4%B8%80%E5%88%99/
Posted by admin on September 10th, 2013
最近同事处理了一则mysql复制错误.发出来参考下
MYSQL同步出错，报错信息如下：
Last_Errno: 1267Last_Error: Error ‘Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,IMPLICIT) for operation ‘concat‘‘ on query. Default database: ‘inshop_app‘. Query: ‘INSERT INTO inshop_app.app_sms_order_info (ORDER_CODE, ORDER_TIME, ORDER_AMOUNT, ORDER_CONTENT, BUY_NUM, ORDER_STATUS, MERCHANT_ID, CREATE_TIME, UPDATE_TIME, APP_TYPE, pay_time, remark) VALUES( NAME_CONST(‘my_order_code‘,_utf8‘SBY130830010708_F0‘ COLLATE ‘utf8_general_ci‘),NOW(),‘0‘,‘1次‘, NAME_CONST(‘my_sms_num‘,1125000),‘1‘, NAME_CONST(‘my_merchant_id‘,10708),NOW(),NOW(),‘2‘,NOW(),CONCAT (‘钻展赠送:‘, NAME_CONST(‘my_sms_num‘,1125000)))‘ |
出错原因分析：
此SQL在Master上执行时是这样的
INSERT INTO inshop_app.app_sms_order_info (ORDER_CODE, ORDER_TIME, ORDER_AMOUNT, ORDER_CONTENT, BUY_NUM, ORDER_STATUS, MERCHANT_ID, CREATE_TIME, UPDATE_TIME, APP_TYPE, pay_time, remark) VALUES( ‘SBY130830010708_F0‘,NOW(),‘0‘,‘1次‘, 1125000,‘1‘, 10708,NOW(),NOW(),‘2‘,NOW(),CONCAT (‘钻展赠送:‘, 1125000)) |
该SQL本身是没问题的，执行成功，但是MYSQL在记录BINLOG的时候，会对常量用NAME_CONST()函数进行“标识”
同步的报错就出现在这个地方
CONCAT (‘钻展赠送:‘, NAME_CONST(‘my_sms_num‘,1125000)) |
其中，’钻展赠送:’是UTF8字符集，NAME_CONST(‘my_sms_num’,1125000)得到的数值型常量被自动转型为LATIN1字符集，外层的CONCAT()函数不支持二种不同字符集进行连接，于是报错
以下测试可验证此分析：
无NAME_CONST()函数标识常量时，即如同在Master上执行时，成功
09:29:06 inshop_app> select concat(‘钻展赠送‘,123);+----------------------------+| concat(‘钻展赠送‘,123) |+----------------------------+| 钻展赠送123 |+----------------------------+1 row in set (0.00 sec) |
有NAME_CONST()函数标识常量时，即如同在Slave上执行时，失败
09:25:17 inshop_app> select concat(‘钻展赠送‘,name_const(‘colname‘,123));ERROR 1267 (HY000): Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,IMPLICIT) for operation ‘concat‘ |
报错与同步是一样的错误
什么情况下MySQL会自动加上NAME_CONST函数
测试1： 直接insert
11:27:32 test> insert into lengzhenguo_mha(c3,c4) values(1,‘a‘),(‘2‘,‘b‘);Query OK, 2 rows affected (0.00 sec)Records: 2 Duplicates: 0 Warnings: 0 |
BINLOG中的内容
#130909 11:28:35 server id 2009 end_log_pos 469 Query thread_id=10 exec_time=0 error_code=0SET TIMESTAMP=1378697315/*!*/;insert into lengzhenguo_mha(c3,c4) values(1,‘a‘),(‘2‘,‘b‘)/*!*/; |
测试2： 简单的存储过程
13:16:42 test> create procedure p_test() -> begin -> insert into lengzhenguo_mha(c3,c4) values(10,‘abc‘),(‘20‘,‘xyz‘); -> commit; -> end -> $Query OK, 0 rows affected (0.00 sec)13:17:38 test> call p_test();Query OK, 0 rows affected (0.00 sec) |
BINLOG中的内容
#130909 13:18:21 server id 2009 end_log_pos 328 Query thread_id=12 exec_time=0 error_code=0use `test`/*!*/;SET TIMESTAMP=1378703901/*!*/;insert into lengzhenguo_mha(c3,c4) values(10,‘abc‘),(‘20‘,‘xyz‘)/*!*/; |
测试3：带参数的存储过程 类似bind value
13:22:43 test> CREATE procedure p_test_2 (i bigint, j varchar(30)) -> begin -> insert into lengzhenguo_mha(c3,c4) values(i,j); -> commit; -> end -> $Query OK, 0 rows affected (0.00 sec)13:23:16 test> call p_test_2(100,‘dba‘);Query OK, 0 rows affected (0.00 sec)13:25:10 test> call p_test_2(‘500‘,‘dba‘);Query OK, 0 rows affected (0.00 sec) |
BINLOG中的内容
#130909 13:23:32 server id 2009 end_log_pos 612 Query thread_id=12 exec_time=0 error_code=0
SET TIMESTAMP=1378704212/*!*/;insert into lengzhenguo_mha(c3,c4) values( NAME_CONST(‘i‘,100), NAME_CONST(‘j‘,_latin1‘dba‘ COLLATE ‘latin1_swedish_ci‘))/*!*/;#130909 13:25:15 server id 2009 end_log_pos 1226 Query thread_id=12 exec_time=0 error_code=0SET TIMESTAMP=1378704315/*!*/;insert into lengzhenguo_mha(c3,c4) values( NAME_CONST(‘i‘,500), NAME_CONST(‘j‘,_latin1‘dba‘ COLLATE ‘latin1_swedish_ci‘))/*!*/; |
注意：’500′在写入Binlog时，已经被转换成数值型了
目前已知的解决方法：
方法1：不要直接使用数值，直接给予字符串，建议使用此方法
09:25:27 inshop_app> select concat(‘钻展赠送‘,name_const(‘colname‘,‘123‘));+----------------------------------------------------+| concat(‘钻展赠送‘,name_const(‘colname‘,‘123‘)) |+----------------------------------------------------+| 钻展赠送123 |+----------------------------------------------------+1 row in set (0.00 sec) |
注意：这里的123加引号，字符串~
方法2：先进行类型转换
09:56:32 inshop_app> select concat(‘钻展赠送‘,convert(name_const(‘colname‘,123) using utf8));+----------------------------------------------------------------------+| concat(‘钻展赠送‘,convert(name_const(‘colname‘,123) using utf8)) |+----------------------------------------------------------------------+| 钻展赠送123 |+----------------------------------------------------------------------+1 row in set (0.00 sec) |