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。

USE information_schema; DESC character_sets;
+----------------------+-------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------------+-------------+------+------+---------+-------+ | CHARACTER_SET_NAME | varchar(32) | YES | | NULL | | | DEFAULT_COLLATE_NAME | varchar(32) | YES | | NULL | | | DESCRIPTION | varchar(60) | YES | | NULL | | | MAXLEN | bigint(3) | YES | | NULL | | +----------------------+-------------+------+------+---------+-------+ 4 rows in set (0.00 sec)
SELECT * FROM `character_sets`;
+--------------------+----------------------+---------------+--------+ | CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION | MAXLEN | +--------------------+----------------------+---------------+--------+ | utf8 | utf8_bin | UTF-8 Unicode | 3 | | utf8mb4 | utf8mb4_bin | UTF-8 Unicode | 4 | | ascii | ascii_bin | US ASCII | 1 | | latin1 | latin1_bin | Latin1 | 1 | | binary | binary | binary | 1 | +--------------------+----------------------+---------------+--------+ 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
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