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[数据库]关于MyCAT字符集的验证


MyCAT默认字符集是UTF8

下面通过查看日志来验证不同的MySQL客户端字符集和服务器字符集对于MyCAT的影响。

日志中与字符集有关的主要有三部分:

1. 初始化MyCAT连接池

2. 心跳检测

3. 在执行SQL语句时的连接同步。

因为MyCAT实现的是三节点的读写分离和自动切换,以下修改的均是localhost节点上MySQL实例的字符集,其它两个点(192.168.244.146和192.168.244.144)均没有修改。默认为

mysql> show variables like 'character_set_%';+--------------------------+----------------------------+| Variable_name      | Value           |+--------------------------+----------------------------+| character_set_client   | utf8            || character_set_connection | utf8            || character_set_database  | latin1           || character_set_filesystem | binary           || character_set_results  | utf8            || character_set_server   | latin1           || character_set_system   | utf8            || character_sets_dir    | /usr/share/mysql/charsets/ |+--------------------------+----------------------------+8 rows in set (0.01 sec)

 

一、当客户端字符集(character_set_client)为utf8,服务端字符集(character_set_server)为latin1。

mysql> show variables like 'character_set_%';+--------------------------+----------------------------+| Variable_name      | Value           |+--------------------------+----------------------------+| character_set_client   | utf8            || character_set_connection | utf8            || character_set_database  | latin1           || character_set_filesystem | binary           || character_set_results  | utf8            || character_set_server   | latin1           || character_set_system   | utf8            || character_sets_dir    | /usr/share/mysql/charsets/ |+--------------------------+----------------------------+8 rows in set (0.00 sec)

MyCAT的日志输出如下:

1. 初始化连接池

2. 心跳检测

3. 在执行SQL语句时的连接同步。

 

二、当客户端字符集为latin1,服务端字符集也为latin1。

mysql> show variables like 'character_set_%';+--------------------------+----------------------------+| Variable_name      | Value           |+--------------------------+----------------------------+| character_set_client   | latin1           || character_set_connection | latin1           || character_set_database  | latin1           || character_set_filesystem | binary           || character_set_results  | latin1           || character_set_server   | latin1           || character_set_system   | utf8            || character_sets_dir    | /usr/share/mysql/charsets/ |+--------------------------+----------------------------+8 rows in set (0.00 sec)

MyCAT的日志输出如下:

1. 初始化MyCAT连接池

2. 心跳检测

3. 在执行SQL语句时的连接同步。

 

三、当客户端字符集为latin1,服务端字符集也为utf8。

mysql> show variables like 'character_set_%';+--------------------------+----------------------------+| Variable_name      | Value           |+--------------------------+----------------------------+| character_set_client   | latin1           || character_set_connection | latin1           || character_set_database  | utf8            || character_set_filesystem | binary           || character_set_results  | latin1           || character_set_server   | utf8            || character_set_system   | utf8            || character_sets_dir    | /usr/share/mysql/charsets/ |+--------------------------+----------------------------+8 rows in set (0.00 sec)

MyCAT的日志输出如下:

1. 初始化MyCAT连接池

2. 心跳检测

3. 在执行SQL语句时的连接同步。

 

四、当客户端字符集为utf8,服务端字符集也为utf8。

mysql> show variables like 'character_set_%';+--------------------------+----------------------------+| Variable_name      | Value           |+--------------------------+----------------------------+| character_set_client   | utf8            || character_set_connection | utf8            || character_set_database  | utf8            || character_set_filesystem | binary           || character_set_results  | utf8            || character_set_server   | utf8            || character_set_system   | utf8            || character_sets_dir    | /usr/share/mysql/charsets/ |+--------------------------+----------------------------+8 rows in set (0.00 sec)

MyCAT的日志输出如下:

1. 初始化MyCAT连接池

2. 心跳检测

3. 在执行SQL语句时的连接同步。

 

总结:

初始化MyCAT连接池,心跳检测的字符与服务端字符集有关,即character_set_server设定的值。当localhost的MySQL实例的字符集改成utf8后,因为192.168.244.146和192.168.244.144两个节点的MySQL实例的字符集并没有发生变化,所以执行心跳检测时,localhost的字符集为utf8,其它两个节点仍为latin1。

同步连接与客户端字符集有关,即character_set_client设定的值。