CHARACTER_SETS

CHARACTER_SETS 表提供字符集相关的信息。TiDB 目前仅支持部分字符集。

1. USE information_schema;
2. DESC character_sets;

1. +----------------------+-------------+------+------+---------+-------+
2. | Field                | Type        | Null | Key  | Default | Extra |
3. +----------------------+-------------+------+------+---------+-------+
4. | CHARACTER_SET_NAME   | varchar(32) | YES  |      | NULL    |       |
5. | DEFAULT_COLLATE_NAME | varchar(32) | YES  |      | NULL    |       |
6. | DESCRIPTION          | varchar(60) | YES  |      | NULL    |       |
7. | MAXLEN               | bigint(3)   | YES  |      | NULL    |       |
8. +----------------------+-------------+------+------+---------+-------+
9. 4 rows in set (0.00 sec)

1. SELECT * FROM `character_sets`;

1. +--------------------+----------------------+---------------+--------+
2. | CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION   | MAXLEN |
3. +--------------------+----------------------+---------------+--------+
4. | utf8               | utf8_bin             | UTF-8 Unicode |      3 |
5. | utf8mb4            | utf8mb4_bin          | UTF-8 Unicode |      4 |
6. | ascii              | ascii_bin            | US ASCII      |      1 |
7. | latin1             | latin1_bin           | Latin1        |      1 |
8. | binary             | binary               | binary        |      1 |
9. +--------------------+----------------------+---------------+--------+
10. 5 rows in set (0.00 sec)

CHARACTER_SETS 表中列的含义如下：

• CHARACTER_SET_NAME：字符集名称
• DEFAULT_COLLATE_NAME：字符集的默认排序规则名称
• DESCRIPTION：字符集的描述信息
• MAXLEN：该字符集存储一个字符所需要的最大字节数