node.js不能连接mysql（Nodejs连接mysql的增删改）

一，创建数据库

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');

二，连接

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

三，简单查询

注意要记得安装node_mysql,直接使用npm install mysql

//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({ host:'127.0.0.1', user: 'root', password: 'root123', database: 'my_news_test', }); 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(); } );

四、Node.js结合MySQL的增、删、改、查操作

1、增

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,?,?)'; var userAddSql_Params = ['Wilson', 55]; //增 add connection.query(userAddSql,userAddSql_Params,function (err, result) { if(err){ console.log('[INSERT ERROR] - ',err.message); return; } console.log('-------INSERT----------'); //console.log('INSERT ID:',result.insertId); console.log('INSERT ID:',result); console.log('#######################'); }); connection.end();

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 = ?,age = ? WHERE id = ?'; var userModSql_Params = ['Hello World',99,7]; //改 up connection.query(userModSql,userModSql_Params,function (err, result) { if(err){ console.log('[UPDATE ERROR] - ',err.message); return; } console.log('----------UPDATE-------------'); console.log('UPDATE affectedRows',result.affectedRows); console.log('******************************'); }); connection.end();

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();

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'; //ɾ connection.query(userDelSql,function (err, result) { if(err){ console.log('[DELETE ERROR] - ',err.message); return; } console.log('-------------DELETE--------------'); console.log('DELETE affectedRows',result.affectedRows); console.log('&&&&&&&&&&&&&&&&&'); }); connection.end();