今天在操作数据库的时候，不知道进去了哪个库，那我们怎么查看当前你正在操作的数据库呢。我总结了一下总共有四种方式
进行查看，今天也写一写，强化一下基础。
1，使用命令：select database();
mysql> select database();
+------------+
| database() |
+------------+
| NULL |
+------------+
1 row in set (0.00 sec)
/*从查询结果可以看出，我们当前没有进入到任何数据库。所以为NULL*/
mysql> use test; /*我们进入test库。*/
mysql> select database(); /*再次执行。*/+------------+
| database() |
+------------+
| test |
+------------+
1 row in set (0.00 sec)/*从查询结果可以看出，我们当前没有进入到任何数据库。*/2，show tables;
+—————-+
| Tables_in_test |
+----------------+
| login |
| login_view |
+----------------+
2 rows in set (0.00 sec)
/*从第一行中可以看出我们目前正处在test库中*/
3，status;
mysql> status
--------------
mysql Ver 14.14 Distrib 5.6.23, for linux-glibc2.5 (x86_64) using EditLine wrapper
Connection id: 22
Current database: test
Current user: root@localhost
SSL: Not in use
Current pager: stdout/* Current database：后面跟着的就是当前库test */
4,通过修改mysql提示符来永久显示当前所属库。
1，链接客户端时通过参数指定
#mysql -uroot -pmysql --prompt 提示符参数2,链接上客户端后，通过prompt命令修改
mysql> prompt 提示符参数；mysql 提示符参数：
\D -->完整的日期
\d -->当前数据库
\h -->服务器名称
\u -->当前用户[root@bogon ~]# mysql -uroot -pmysql --prompt "\u@\h \d>"
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 24
Server version: 5.6.23-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)
Copyright (c) 2000, 2015, 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.
root@localhost (none)>prompt mysql>
PROMPT set to 'mysql>'
mysql>use test;
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
mysql>prompt \u@\h \d>
PROMPT set to "\u@\h \d>"
root@localhost test>