调整MySQL数据表字符集
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数据表t1表的结构.
mysql> show create table t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`account` varchar(30) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `uniq_account` (`account`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
1. 调整默认charset为utf8mb4.
mysql> alter table t1 default charset utf8mb4;
Query OK, 0 rows affected (0.07 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`account` varchar(30) CHARACTER SET utf8 NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `uniq_account` (`account`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
2. 调整account字段collate为utf8mb4_bin.
mysql> alter table t1 modify column account varchar(30) collate utf8mb4_bin not null default '';
Query OK, 0 rows affected (0.71 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`account` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `uniq_account` (`account`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
3. 调整默认charset, 和各字段charset为utf8.
mysql> alter table t1 convert to charset utf8;
Query OK, 0 rows affected (1.65 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`account` varchar(30) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `uniq_account` (`account`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
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