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1.服务的停止与启动
MySQL安装完毕之后，需要启动服务器进程，不然客户端无法连接数据库。
---以管理员身份运行windows命令提示符，否则会出现拒绝访问：
# 启动MySQL服务命令 net start MySQL服务名 # 停止MySQL服务命令 net stop MySQL服务名
1.MySQL服务处于已停止状态：
2.启动MySQL服务：
3.MySQL服务处于已启动状态：
start和stop后面的服务名应与之前配置环境变量时指定的服务名一致。
2.登陆与退出
格式：
mysql -h 主机名 -P 端口号 -u 用户名 -p密码
举例：
mysql -h localhost -P 3306 -u root -pabc123 # 之前设置的root用户的密码是abc123
登陆成功：
这里出现了警告，只需要改变密码输入的方法：
退出指令：
注意：
（1）-p与密码之间不能有空格，其他参数名与参数值之间可以有空格也可以没有空格。如：
mysql -hlocalhost -P3306 -uroot -pabc123
（2）密码建议在下一行输入，保证安全。
（3）客户端和服务器在同一台机器上，所以输入localhost或者IP地址127.0.0.1。同时，因为是连接本机：
-hlocalhost就可以省略，如果端口号没有修改：-P3306也可以省略。
登陆之前可以通过：
mysql -V
或者
mysql --version
的方式获取MySQL Server服务版本的信息。
登陆之后通过
select version();
查看当前版本信息。
