mysql卸载
Mysql卸载
yum remove mysql mysql-server mysql-libs compat-mysql51
rm -rf /var/lib/mysql
rm /etc/my.cnf
查看是否还有mysql软件：
rpm -qa|grep mysql
有的话继续删除
Mysql安装
1>若本地没有安装包 可以考虑使用yum命令进行下载
# yum -y install mysql-server
# yum -y install php-mysql
2>安装后，MySQL自动启动，默认没有用户名和密码，设置新密码
# /usr/bin/mysqladmin -u root password 'aaaaaa'
[root@luozhonghua ~]# /usr/bin/mysqladmin -u root password 'aaaaaa'
/usr/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!
解决：
2.1》/etc/rc.d/init.d/mysqld status 看看mysql是否已经启动
3.2》service mysqld start
3>登录MySQL
>mysql -u root -p
enter password:’aaaaaa’
4>赋权连接的主机
#grant select,insert,update,delete on *.* to root@192.168.1.101 identified by 'aaaaaa'
grant select,insert,update,delete on *.* to root@127.0.0.1 identified by 'aaaaaa';
5>更改默认字符集
# cp my-medium.cnf /etc/my.cnf
在[client]下加入 default-character-set=utf8
在[mysqld]下加入 default-character-set=utf8
查找安装路径
Rpm -qa | grep mysql
Rpm -ql 包名
[root@luozhonghua charsets]# find /usr -name my-medium.cnf
/usr/share/doc/mysql-server-5.1.73/my-medium.cnf
/usr/share/mysql/my-medium.cnf
#6>设置mysql开机自启动
# vi /etc/rc.local
加入如下一行
#/usr/share/mysql/mysql.server start
7>重新启动MySQL
# /etc/init.d/mysql restart
service mysqld restart
8>测试;
[root@luozhonghua ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 3
Server version: 5.1.73 Source distribution
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> create database xxx
-> ;
Query OK, 1 row affected (0.06 sec)
mysql> ls
-> ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th at corresponds to your MySQL server version for the right syntax to use near 'ls' at line 1
mysql> show databases
-> ;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| test |
| xxx |
+--------------------+
4 rows in set (0.06 sec)
mysql> use xxx;
Database changed
mysql> show database
-> ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual th at corresponds to your MySQL server version for the right syntax to use near 'database' at line 1
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
|测试 |
| xxx |
+--------------------+
集合中 4 行（0.01 秒）
mysql> 使用xxx;
数据库已更改
mysql> create table test(
-> int id not null,
-> varchar(20) name null);
错误 1064 (42000): 你有SQL 语法错误；检查与您的 MySQL 服务器版本相对应的手册，了解在附近使用的正确语法 'int id not null,
varchar(20) name null)' 第 2 行
mysql> 显示表;
空set (0.00 sec)
mysql> create table dbtest (
-> id int ,
-> name varchar);
ERROR 1064 (42000): 您有一个错误在你的 SQL 语法中；检查与您的 MySQL 服务器版本相对应的手册，了解在附近使用的正确语法 ')' 第 3 行
mysql> 创建表 dbtest (
-> id int,
-> name varchar(10 ));
查询正常，0 行受影响（0.07 秒）
mysql> 显示表;
+---------------+
| Tables_in_xxx |
+---------------+
| dbtest |
+----------------+
集合中的 1 行（0.01 秒）
mysql> drop table xxx;
错误 1051 (42S02): 未知表 'xxx'
mysql> drop table dbtest;
查询正常，0 行受影响（0.00 秒）
mysql> ls
- > ;
错误 1064 (42000)：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在附近使用的正确语法 'ls' at line 1
mysql> 显示表格;
空集（0.00 秒）
mysql>
