USE

USE 语句可为用户会话选择当前数据库。

语法图

UseStmt:

UseStmt

DBName:

DBName

示例

USE mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
SHOW TABLES;
+----------------------+
| Tables_in_mysql      |
+----------------------+
| GLOBAL_VARIABLES     |
| bind_info            |
| columns_priv         |
| db                   |
| default_roles        |
| gc_delete_range      |
| gc_delete_range_done |
| help_topic           |
| role_edges           |
| stats_buckets        |
| stats_feedback       |
| stats_histograms     |
| stats_meta           |
| tables_priv          |
| tidb                 |
| user                 |
+----------------------+
16 rows in set (0.00 sec)
CREATE DATABASE newtest;
Query OK, 0 rows affected (0.10 sec)
USE newtest;
Database changed
SHOW TABLES;
Empty set (0.00 sec)
CREATE TABLE t1 (a int);
Query OK, 0 rows affected (0.10 sec)
SHOW TABLES;
+-------------------+
| Tables_in_newtest |
+-------------------+
| t1                |
+-------------------+
1 row in set (0.00 sec)

MySQL 兼容性

在 2.0 版本中,用户可以使用 USE 访问任意数据库。在 3.0 及以后的版本中 USE 会检查用户是否拥有访问数据库的权限。

目前 USE 语句与 MySQL 完全兼容。如有任何兼容性差异,请在 GitHub 上提交 issue

另请参阅

"USE" 更新于 May 14 2020: add alias (#3101) (940fd06)