mysql在命令行中，指定要连接的数据库？

需求描述：

　　mysql客户端，可以在登录到mysql数据库时，指定要连接到哪个数据库

　　这里进行一个测试。

测试过程：

1.mysql通过-D参数指定连接到test数据库

[mysql@redhat6 scripts]$ mysql -uroot -p -D test
Enter password:
ERROR  (): Access denied for user 'root'@'localhost' (using password: YES)
[mysql@redhat6 scripts]$ mysql -uroot -p -D test
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.5.-log MySQL Community Server (GPL)

Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select database();
+------------+
| database() |
+------------+
| test       |
+------------+
 row in set (0.00 sec)

备注：通过在-D参数后面指定数据库名字，就连接到了test数据库。

2.通过-D参数，连接到test01数据库

[mysql@redhat6 scripts]$ mysql -uroot -p -D test01
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.5.-log MySQL Community Server (GPL)

Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select database();
+------------+
| database() |
+------------+
| test01     |
+------------+
 row in set (0.00 sec)

mysql> 

备注：通过在-D参数后面指定数据库名字，就连接到了test01数据库。

小结：通过-D 参数指明要直接连接到哪个数据库。

文档创建时间：2018年3月20日11:37:27