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mysql已存在的表更改字符集
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mysql> show create table t1; +-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | t1 | CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(12) DEFAULT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1 | +-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row inset (0.00 sec) mysql> select * from t1; +----+--------+-----+ | id | name | age | +----+--------+-----+ | 1 | linzi1 | 20 | | 2 | linzi2 | 21 | | 3 | linzi3 | 23 | +----+--------+-----+ 3 rows inset (0.00 sec) mysql> alter table t1 charset=utf8mb4; Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0
#更改之后发现原来的数据依然是latin1的字符集 mysql> show create table t1; +-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | t1 | CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(12) CHARACTER SET latin1 DEFAULT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 | +-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row inset (0.00 sec) mysql> alter table t1 convert to character set utf8mb4; Query OK, 3 rows affected (0.08 sec) Records: 3 Duplicates: 0 Warnings: 0 mysql> show create table t1; +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | t1 | CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(12) DEFAULT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 | +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row inset (0.00 sec)
另外,配置参数character_set_server要设置成utf8mb4
原文:https://www.cnblogs.com/hbxZJ/p/11141785.html
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