root@webwall:/home/xiachengjiao# vi/webwall/mysql/my.cnf（看配置文件中的参数）

root@webwall:/webwall/mysql/bin# ./mysql -u root -S /var/mysql1.sock -p

Enter password: Enter password:********

ERROR 2002 (HY000): Can‘t connect to local MySQL serverthrough socket ‘/var/mysql1.sock‘ (2)

提示连不上数据库

查找原因并解决

ps -A |grep mysql查看数据库进程并没有开启

xiachengjiao@webwall:/webwall/mysql/bin$sudo ./start.sh           开启数据库

[sudo] password for xiachengjiao:123456

ps -A |grep mysql  查看数据库进程是否开启，如下显示：

5466 pts/1    00:00:00 mysqld_safe

 7420pxs/1    00:00:00 mysqld_safe

 7725pxs/1    00:00:00 mysqld

 7817pxs/1    00:00:00 mysqld

提示数据库进程已经开启

重新连接数据库

root@webwall:/webwall/mysql/bin# ./mysql -uroot -S /var/mysql1.sock -p

Enter password: Enter password:12wq12wq

数据库操作如下：

mysql> show databases;

mysql> use new_db;

mysql> show tables;

mysql> use local;

mysql> show tables;

mysql> select * from ww_role_t;

mysql> desc ww_role_t;

mysql> insert into ww_role_t(rolename,roledescribe, systemrole, permission) values("test","test", 1, "1111110000001111");

mysql> select * from ww_role_t;

mysql> delete ww_role_t where rolename ="test";