SET [NAMES|CHARACTER SET]

SET NAMES，SET CHARACTER SET 和 SET CHARSET 语句用于修改当前连接的变量 character_set_client，character_set_results 和 character_set_connection。

语法图

SetNamesStmt

SET [NAMES|CHARACTER SET] - 图1

1. SetNamesStmt ::=
2. "SET" ("NAMES" ("DEFAULT" | CharsetName ("COLLATE" ("DEFAULT" | CollationName))?) | ("CHARSET" | ("CHAR" | "CHARACTER") "SET") ("DEFAULT" | CharsetName))

示例

1. SHOW VARIABLES LIKE 'character_set%';

1. +--------------------------+--------------------------------------------------------+
2. | Variable_name            | Value                                                  |
3. +--------------------------+--------------------------------------------------------+
4. | character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
5. | character_set_connection | utf8mb4                                                |
6. | character_set_system     | utf8                                                   |
7. | character_set_results    | utf8mb4                                                |
8. | character_set_client     | utf8mb4                                                |
9. | character_set_database   | utf8mb4                                                |
10. | character_set_filesystem | binary                                                 |
11. | character_set_server     | utf8mb4                                                |
12. +--------------------------+--------------------------------------------------------+
13. 8 rows in set (0.01 sec)

1. SET NAMES utf8;

1. Query OK, 0 rows affected (0.00 sec)

1. SHOW VARIABLES LIKE 'character_set%';

1. +--------------------------+--------------------------------------------------------+
2. | Variable_name            | Value                                                  |
3. +--------------------------+--------------------------------------------------------+
4. | character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
5. | character_set_connection | utf8                                                   |
6. | character_set_system     | utf8                                                   |
7. | character_set_results    | utf8                                                   |
8. | character_set_client     | utf8                                                   |
9. | character_set_server     | utf8mb4                                                |
10. | character_set_database   | utf8mb4                                                |
11. | character_set_filesystem | binary                                                 |
12. +--------------------------+--------------------------------------------------------+
13. 8 rows in set (0.00 sec)

1. SET CHARACTER SET utf8mb4;

1. Query OK, 0 rows affected (0.00 sec)

1. SHOW VARIABLES LIKE 'character_set%';

1. +--------------------------+--------------------------------------------------------+
2. | Variable_name            | Value                                                  |
3. +--------------------------+--------------------------------------------------------+
4. | character_set_connection | utf8mb4                                                |
5. | character_set_system     | utf8                                                   |
6. | character_set_results    | utf8mb4                                                |
7. | character_set_client     | utf8mb4                                                |
8. | character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
9. | character_set_database   | utf8mb4                                                |
10. | character_set_filesystem | binary                                                 |
11. | character_set_server     | utf8mb4                                                |
12. +--------------------------+--------------------------------------------------------+
13. 8 rows in set (0.00 sec)

MySQL 兼容性

SET [NAMES|CHARACTER SET] 语句与 MySQL 完全兼容。如发现任何兼容性差异，请尝试 TiDB 支持资源。

另请参阅