Node.JS + Mysql数据库

服务嘛，当然离不开数据库了，你要是见到数据就哭了，我建议你还是看看本文，不要做数据哭啊，哈哈哈

要做 ‘数据酷’嘛，哈哈哈

一 安装

　　1. wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

　　2. yum -y install mysql57-community-release-el7-10.noarch.rpm

　　3. yum -y install mysql-community-server

二 启动

　　systemctl start mysqld.service

三 改密码

　　1. 找到初始密码，grep "password" /var/log/mysqld.log

　　

　　第一个冒号后边的就是初始密码，当然，你的机器上会不同，可别抄我的啊

　　2. mysql -uroot -p，之后要你输入密码，你就输入你查到的那个密码就登陆Mysql了

　　3. 改变密码

　　　　3.1 set global validate_password_policy=0;

　　　　3.2 set global validate_password_length=1;

　　　　3.3 ALTER USER 'root'@'localhost' IDENTIFIED BY 'your new password';

四 删除临时仓库

　　yum -y remove mysql57-community-release-el7-10.noarch

五 DEMO

　

var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password:'11111111',
database : 'test'
});

connection.connect();

connection.query('select 1+1 as solution', function(error, results, fields) {
if (error) throw error;
console.log('The solution is: ', results[0].solution);
});

var addSql = 'INSERT INTO websites(Id,name,url, alexa,country) VALUES(0,?,?,?,?)';
var addSqlParams = ['zcl','https://zcl.com', '11111111','CN'];
connection.query(addSql,addSqlParams,function(err,result) {
if (err) {
console.log('[INSERT ERROR] -',err.message);
return;
}
console.log('------------------------insert---------------------------');
console.log('INSERT ID:', result);
console.log('---------------------------------------------------------');
});

var modSql = 'UPDATE websites SET name=?,url=? WHERE Id=?';
var modSqlParams =['woodzcl','http://zcl.com',6];
connection.query(modSql, modSqlParams,function(err, result) {
if (err) {
console.log('[UPDATE ERROR] - ', err.message);
}
console.log('------------------------update---------------------------');
console.log('UPDATE affectedRows:', result.affectedRows);
console.log('---------------------------------------------------------');

});

var delSql = 'DELETE FROM websites WHERE Id=6';
connection.query(delSql,function(err, result) {
if (err) {
console.log('[DELETE ERROR] - ',err.message);

return;
}
console.log('------------------------delete---------------------------');
console.log('DELETE affectedRows:', result.affectedRows);
console.log('---------------------------------------------------------');
});

var sql = 'SELECT * FROM websites';
connection.query(sql, function(err, result) {
if (err){
console.log('[SELECT ERROR]- ', err.message);
}
console.log('------------------------select---------------------------');
console.log(result);
console.log('---------------------------------------------------------');
});

//结果

node test.js
The solution is: 2
------------------------insert---------------------------
INSERT ID: OkPacket {
fieldCount: 0,
affectedRows: 1,
insertId: 9,
serverStatus: 2,
warningCount: 0,
message: '',
protocol41: true,
changedRows: 0 }
---------------------------------------------------------
------------------------update---------------------------
UPDATE affectedRows: 0
---------------------------------------------------------
------------------------delete---------------------------
DELETE affectedRows: 0
---------------------------------------------------------
------------------------select---------------------------
[ RowDataPacket {
id: 1,
name: 'Google',
url: 'https://www.google.cm/',
alexa: 1,
country: 'USA' },
RowDataPacket {
id: 2,
name: 'weixin',
url: 'https://www.taobao.com/',
alexa: 13,
country: 'CN' },
RowDataPacket {
id: 3,
name: 'zcl',
url: 'http://www.runoob.com/',
alexa: 4689,
country: 'CN' },
RowDataPacket {
id: 4,
name: weibo',
url: 'http://weibo.com/',
alexa: 20,
country: 'CN' },
RowDataPacket {
id: 5,
name: 'Facebook',
url: 'https://www.facebook.com/',
alexa: 3,
country: 'USA' },
RowDataPacket {
id: 7,
name: 'zcl',
url: 'https://zcl.com',
alexa: 11111111,
country: 'CN' },
RowDataPacket {
id: 8,
name: 'zcl',
url: 'https://zcl.com',
alexa: 11111111,
country: 'CN' },
RowDataPacket {
id: 9,
name: 'zcl',
url: 'https://zcl.com',
alexa: 11111111,
country: 'CN' } ]
---------------------------------------------------------

Finally:

　　好了，Node.JS 我打算就到这里了，如果你还有什么疑问，我还是愿意和你一起探讨的。

　　再会！