USE

USE 语句可为用户会话选择当前数据库。

语法图

UseStmt

USE - 图1

DBName

USE - 图2

1. UseStmt ::=
2. "USE" DBName

4. DBName ::=
5. Identifier

示例

1. USE mysql;

1. Reading table information for completion of table and column names
2. You can turn off this feature to get a quicker startup with -A

4. Database changed

1. SHOW TABLES;

1. +-------------------------+
2. | Tables_in_mysql         |
3. +-------------------------+
4. | GLOBAL_VARIABLES        |
5. | bind_info               |
6. | columns_priv            |
7. | db                      |
8. | default_roles           |
9. | expr_pushdown_blacklist |
10. | gc_delete_range         |
11. | gc_delete_range_done    |
12. | global_priv             |
13. | help_topic              |
14. | opt_rule_blacklist      |
15. | role_edges              |
16. | stats_buckets           |
17. | stats_feedback          |
18. | stats_histograms        |
19. | stats_meta              |
20. | stats_top_n             |
21. | tables_priv             |
22. | tidb                    |
23. | user                    |
24. +-------------------------+
25. 20 rows in set (0.01 sec)

1. CREATE DATABASE newtest;

1. Query OK, 0 rows affected (0.10 sec)

1. USE newtest;

1. Database changed

1. SHOW TABLES;

1. Empty set (0.00 sec)

1. CREATE TABLE t1 (a int);

1. Query OK, 0 rows affected (0.10 sec)

1. SHOW TABLES;

1. +-------------------+
2. | Tables_in_newtest |
3. +-------------------+
4. | t1                |
5. +-------------------+
6. 1 row in set (0.00 sec)

MySQL 兼容性

USE 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