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