Nodejs连接mysql并实现增、删、改、查操作的方法详解

var connection = mysql.createConnection({
 host   : '127.0.0.1',
 user   : 'root',
 password : 'root123',
 port: '3306',
 database: 'my_news_test',
});

Source Database    : my_news_test
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for node_user
-- ----------------------------
DROP TABLE IF EXISTS `node_user`;
CREATE TABLE `node_user` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(30) DEFAULT NULL,
 `age` int(8) DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of node_user
-- ----------------------------
INSERT INTO `node_user` VALUES ('1', 'admin', '32');
INSERT INTO `node_user` VALUES ('2', 'dans88', '45');
INSERT INTO `node_user` VALUES ('3', '张三', '35');
INSERT INTO `node_user` VALUES ('4', 'ABCDEF', '88');
INSERT INTO `node_user` VALUES ('5', '李小二', '65');

D:\User\myappejs4>npm install mysql
mysql@2.5.4 node_modules\mysql
├── require-all@0.0.8
├── bignumber.js@1.4.1
└── readable-stream@1.1.13 (inherits@2.0.1, string_decoder@0.10.31, isarray@0
.0.1, core-util-is@1.0.1)

//mysql.js
//首先需要安装nodejs 的mysql包
//npm install mysql
//编写nodejs与mysql交互的代码
var mysql = require('mysql');
var TEST_DATABASE = 'my_news_test';
var TEST_TABLE = 'node_user';
//创建连接
var client = mysql.createConnection({
 user: 'root',
 password: 'root123',
});
client.connect();
client.query("use " + TEST_DATABASE);
client.query(
 'SELECT * FROM '+TEST_TABLE,
 function selectCb(err, results, fields) {
  if (err) {
   throw err;
  }
    if(results)
   {
     for(var i = 0; i < results.length; i++)
     {
       console.log("%d\t%s\t%s", results[i].id, results[i].name, results[i].age);
     }
   }
  client.end();
 }
);

D:\User\myappejs4>node mysqltest.js
1    admin  32
2    dans88 45
3    张三  35
4    ABCDEF  88
5    李小二 65

var mysql = require('mysql');
var connection = mysql.createConnection({
 host   : '127.0.0.1',
 user   : 'root',
 password : 'root123',
 port: '3306',
 database: 'my_news_test',
});
connection.connect();
var userAddSql = 'INSERT INTO node_user(id,name,age) VALUES(0,"htmlcode">

D:\User\myappejs4>node mysqltestadd.js
-------INSERT----------
INSERT ID: { fieldCount: 0,
 affectedRows: 1,
 insertId: 6,
 serverStatus: 2,
 warningCount: 0,
 message: '',
 protocol41: true,
 changedRows: 0 }
#######################





2、改


var mysql = require('mysql');
var connection = mysql.createConnection({
 host   : '127.0.0.1',
 user   : 'root',
 password : 'root123',
 port: '3306',
 database: 'my_news_test',
});
connection.connect();
var userModSql = 'UPDATE node_user SET name = "htmlcode">

D:\User\myappejs4>node mysqltest_up.js
----------UPDATE-------------
UPDATE affectedRows 1
******************************




3、查操作


var mysql = require('mysql');
var connection = mysql.createConnection({
 host   : '127.0.0.1',
 user   : 'root',
 password : 'root123',
 port: '3306',
 database: 'my_news_test',
});
connection.connect();
var userGetSql = 'SELECT * FROM node_user';
//查 query
connection.query(userGetSql,function (err, result) {
    if(err){
     console.log('[SELECT ERROR] - ',err.message);
     return;
    }
    console.log('---------------SELECT----------------');
    console.log(result);
    console.log('$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$');
});
connection.end();




运行的结果如下


D:\User\myappejs4>node mysqltest_query.js
---------------SELECT----------------
[ { id: 1, name: 'admin', age: 32 },
 { id: 2, name: 'dans88', age: 45 },
 { id: 3, name: '张三', age: 35 },
 { id: 4, name: 'ABCDEF', age: 88 },
 { id: 5, name: '李小二', age: 65 },
 { id: 6, name: 'Wilson', age: 55 } ]
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$





4、删除操作


var mysql = require('mysql');
var connection = mysql.createConnection({
 host   : '127.0.0.1',
 user   : 'root',
 password : 'root123',
 port: '3306',
 database: 'my_news_test',
});
connection.connect();
var userDelSql = 'DELETE FROM node_user WHERE id = 7';
//"//img.jbzj.com/file_images/article/201801/201814121518714.png" alt="" />

增、删、改、查操作应会部完成了！
希望本文所述对大家nodejs程序设计有所帮助。

                                
                                

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