centos7下安装mysql及测试centos

步骤1： 下载并安装MySQL

# wget http://dev./get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server

步骤2：修改配置文件 /etc/my.cnf 内容如下：

# For advice on how to change settings please see
# http://dev./doc/refman/5.6/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
#----------------- UTF-8 -----------------#
skip-character-set-client-handshake
init-connect='SET NAMES utf8'
character-set-server=utf8

character_set_database=utf8
#----------------- UTF-8 -----------------#

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

步骤3：重启mysql服务，配置文件才能生效

# service mysqld restart

步骤4：连接mysql服务

# mysql -uroot -p

按空格健即可，因为初次安装mysql，root账号并没有设置密码。

设置密码的方法：

mysql> set password for ‘root’@‘localhost’ = password('123456');

例如：这里，设置root账号的登陆密码为 123456

步骤5：简单操作mysql

1）连接mysql数据库服务

2）创建数据库db_test，创建user表

mysql> create database db_test;
mysql> use db_test;

mysql> create table user(  -> id INT NOT NULL AUTO_INCREMENT,  -> name varchar(25) ,  -> gender varchar(10),  -> mobile varchar(40),  -> Create_time date,  -> primary key(id)  -> )ENGINE=InnoDB DEFAULT CHARSET=utf8;

强调，ENGINE=InnoDB DEFAULT CHARSET=utf8; 保证了中文插入数据库出现乱码的情况！

可以通过如下命令查看编码格式：

show variables like "%char%";

这里之所以保证了编码格式均为utf8，源于配置文件/etc/my.cnf 的设置

#----------------- UTF-8 -----------------#
skip-character-set-client-handshake
init-connect='SET NAMES utf8'
character-set-server=utf8

character_set_database=utf8
#----------------- UTF-8 -----------------#

及创建表的时候声明了

ENGINE=InnoDB DEFAULT CHARSET=utf8; 

3）简单插入一条数据，并查看

步骤6：在nodejs中操作mysql数据库

1）远程授权连接mysql

mysql> grant all on db_test .* to yzx@localhost identified by '123456';

mysql> flush privileges;

格式：grant all on 数据库名字 .* to 用户名@localhost identified by ‘密码’

刷新权限。flush privileges

2）新建mysql.js 代码如下：

var mysql = require('mysql');   //引入mysql包，(npm install mysql --save)

var pool = mysql.createPool({    //创建一个线程池
  connectionLimit: 10,          //允许同时有10个线程访问mysql
  host: 'localhost',            //本地IP
  user: 'yzx',                  //用户名 yzx
  password: '123456',           //密码 123456
  database: 'db_test'           //数据库名字
});

pool.getConnection(function (err, connection) {   //开启连接
  if (err) throw err;

  var value = 'yzx';
  var query = connection.query('SELECT * FROM user WHERE name=?', value, function (err, result) {
    if (err) throw err;

    console.log(result);
    connection.release();
  });
  console.log(query.sql); 
});

运行结果如下： 

3）插入一条数据 mysql.js代码修改如下：

var mysql = require('mysql');

var pool = mysql.createPool({
  connectionLimit: 10,
  host: 'localhost',
  user: 'yzx',
  password: '123456',
  database: 'db_test'
});

pool.getConnection(function (err, connection) {
  if (err) throw err;

  var sql='INSERT INTO user (name,gender,mobile) values(?,?,?)';
  var sqlParams = ['小叶', '男', '10086'];
  var query = connection.query(sql, sqlParams, function (err, result) {
    if (err) throw err;

    console.log("result: ",result);
    connection.release();
  });
  console.log("query.sql: ",query.sql);
});

在本地查看数据库