[英]master to slave replication in mysql
I need master to slave replication in mysql. 我需要mysql中的master到slave复制。
so I am creating this procedure to change the master dynamically by procedure 所以我创建此过程以通过过程动态更改主服务器
delimiter //
CREATE PROCEDURE change_master( in host_ip varchar(50))
begin
stop slave;
CHANGE MASTER TO MASTER_HOST = host_ip, MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave';
start slave;
end;
//
but I am getting a error. 但是我收到了一个错误。
ERROR 1064 (42000): You have an error in your SQL syntax; 错误1064(42000):您的SQL语法有错误; check the manual that corresponds to your MySQL server version for the right syntax to use near 'host_ip, MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave'; 检查与MySQL服务器版本对应的手册,以便在'host_ip,MASTER_PORT = 3306,MASTER_USER ='复制',MASTER_PASSWORD ='slave'附近使用正确的语法; s' at line 4 在第4行
If I left it blank then fine 如果我把它留空,那就好了
eg. 例如。
CHANGE MASTER TO MASTER_HOST = '', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave';
I tried many time but in this query I am not able to use any variable why? 我尝试了很多次,但在这个查询中我无法使用任何变量为什么?
If you know help me. 如果你知道帮助我。
thanks . 谢谢 。
The host value must be enclosed in quotes. 主机值必须用引号括起来。 I think this cannot be possible unless you use a prepared statement. 我认为除非你使用准备好的声明,否则这是不可能的。
delimiter //
CREATE PROCEDURE change_master( in host_ip varchar(50))
begin
set @ssql:=concat("CHANGE MASTER TO MASTER_HOST = '",host_ip,"', MASTER_PORT=3306, MASTER_USER='replication', MASTER_PASSWORD='slave'");
stop slave;
prepare sql_stm from @ssql;
execute sql_stm;
deallocate prepare sql_stm;
start slave;
end//
delimiter ;
Regards! 问候! Tinel Barb Tinel Barb
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