1.使用解压版mysql的过程
1.以管理员身份打开cmd窗口
2.cd 到 mysqlC:\SoftWa\mysql\mysql-5.7.28-winx64\bin
3.通过net start mysql 启动mysql服务
4.登录:mysql -u root -p
5.输入密码:123456成功进入
注意:有时候不成功,看看3306端口有没有被占用,因为之前用了xampp可能会占用端口导致失败
2.使用解压版mysql进行简单的查询测试
(1)查询显示所有数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.02 sec)
(2)查看当前使用的数据库
mysql> select database();
+------------+
| database() |
+------------+
| NULL |
+------------+
1 row in set (0.00 sec)
(3)查看数据库里有哪些表
mysql> show tables;
+-------------------+
| Tables_in_shopcmj |
+-------------------+
| address |
| assess |
| category |
| orderitem |
| orders |
| product |
| user |
+-------------------+
7 rows in set (0.00 sec)
(4)查看数据表中都有哪些字段
DESC tablename;
mysql> DESC user;
+----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| uid | varchar(50) | NO | PRI | NULL | |
| username | varchar(20) | YES | | NULL | |
| password | varchar(10) | YES | | NULL | |
| name | varchar(10) | YES | | NULL | |
| sex | varchar(10) | YES | | NULL | |
| email | varchar(255) | YES | | NULL | |
+----------+--------------+------+-----+---------+-------+
6 rows in set (0.01 sec)
查看数据库使用端口
mysql> show variables like 'port';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port | 3306 |
+---------------+-------+
1 row in set, 1 warning (0.01 sec)