CentOS6.2下YUM安裝MySQL

用yum安裝MySql

1. 打入以下命令：
   1. [root@mysql ~]# yum -y install mysql-server      //自動從網上搜索資源並自動下載安裝
2. [root@mysql ~]# chkconfig mysqld on    //設置開機啓動MySql服務
   1. 檢查是否爲開機啓動
   2. 打入命令：[root@mysql ~]# chkconfig –list
   3. 看到：mysqld          0:off   1:off   2:on    3:on    4:on    5:on    6:off 即表示已設置爲開機啓動，二、三、四、5爲on
3. 啓動MySql服務
   1.  /etc/rc.d/init.d/mysqld start   //從文件啓動MySql服務
   2. service mysqld start            //以服務名方式啓動

 

MySql初始化環境設置（一）

1. 設置MySQL的root用戶設置密碼，由於MySQL被安裝時，它的root用戶時沒有設置密碼的。

–      [root@mysql ~]# mysql -u root

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.1.61 Source distribution

Copyright (c) 2000, 2011, 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>

2.       如上，默認是不須要密碼就能夠進入數據庫操做，下面查看MySQL數據庫用戶信息

 

 

MySql初始化環境設置（二）

1. 打入命令：select user,host,password from mysql.user; //能夠看到密碼都爲空

–      +------+-----------+----------+

–      | user | host      | password |

–      +------+-----------+----------+

–      | root | localhost |          |

–      | root | mysql     |          |

–      | root | 127.0.0.1 |          |

–      |      | localhost |          |

–      |      | mysql     |          |

–      +------+-----------+----------+

–      5 rows in set (0.00 sec)

–      set password for root@localhost=password(‘123456789’); //設置root用戶密碼爲123456789

 

 

MySql初始化環境設置（三）

•       打入命令：select user,host,password from mysql.user; //查看剛設置的密碼，能夠看到密碼已經通過加密處理

–      +------+-----------+-------------------------------------------+

–      | user | host      | password                                  |

–      +------+-----------+-------------------------------------------+

–      | root | localhost | *CC67043C7BCFF5EEA5566BD9B1F3C74FD9A5CF5D |

–      | root | mysql     |                                           |

–      | root | 127.0.0.1 |                                           |

–      |      | localhost |                                           |

–      |      | mysql     |                                           |

–      +------+-----------+-------------------------------------------+

–      5 rows in set (0.00 sec)

•       打入exit命令退出數據庫鏈接，測試root密碼是否生效

 

 

MySql初始化環境設置（四）

•       打入命令：mysql –u root

–      ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysql -u root' at line 1

–      彈出圖上提示說明剛設置的密碼已生效

•       下面經過密碼登錄，打入命令：mysql –u root –p //在Enter password後輸入剛纔設置的密碼，看到下面即表示登錄成功

–      [root@mysql ~]# mysql -u root -p

–      Enter password:

–      Welcome to the MySQL monitor. Commands end with ; or \g.

–      Your MySQL connection id is 3

–      Server version: 5.1.61 Source distribution

–      Copyright (c) 2000, 2011, 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>

 

 

增刪改查語句

•       Show databases; //查看系統已存在的數據庫

•       use databasesname;   //選擇須要使用的數據庫

•       drop database databasename; //刪除選定的數據庫

•       exit    //退出數據庫的鏈接

•       create database test01;    //創建名爲test的數據庫

–      mysql> show databases;

–      +--------------------+

–      | Database           |

–      +--------------------+

–      | information_schema |

–      | mysql              |

–      | test               |

–      | test01             |

–      +--------------------+

–      4 rows in set (0.00 sec)

•        能夠看到新建的test01數據庫

•       use test01;      //鏈接到數據庫test01

–      mysql> use test01;

–      Database changed

•       mysql> create talbe test(num int,name varchar(50)); //在數據庫中創建表

–      mysql> create table test(num int,name varchar(50));

–      Query OK, 0 rows affected (0.11 sec)

•       mysql> insert into test values(1,’Hello World!’) ;   //插入一個值到表中

–      mysql> create table test(num int,name varchar(50));

–      Query OK, 0 rows affected (0.11 sec)

•       select * from test;   //查看數據庫中表的信息

–       mysql> select * from test;

–      +------+--------------+

–      | num | name         |

–      +------+--------------+

–      |    1 | Hello World! |

–      +------+--------------+

–1 row in set (0.00 sec)