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 1045 (28000): 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 14 Server version: 5.5.57-log MySQL Community Server (GPL) Copyright (c) 2000, 2013, 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 | +------------+ 1 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 15 Server version: 5.5.57-log MySQL Community Server (GPL) Copyright (c) 2000, 2013, 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 | +------------+ 1 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