nodejs 连接数据库

最新推荐文章于 2025-06-02 10:03:07 发布

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本文详细介绍如何使用Node.js操作MySQL数据库，包括安装mysql模块、编写连接与交互代码，并演示了增、删、改、查的具体实现及运行结果。

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1、先需要安装nodejs 的mysql包

开始菜单点击控制台node.js commond prompt，运行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)

2、编写nodejs与mysql交互的代码

//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();

}

);

3、运行结果

D:\User\myappejs4>node mysqltest.js

1 admin 32

2 dans88 45

3 张三 35

4 ABCDEF 88

5 李小二 65

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();

运行如下

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 = ?,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();

运行结果如下

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';

//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();

运行的结果如下

D:\User\myappejs4>node mysqltest_del.js

-------------DELETE--------------

DELETE affectedRows 1

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

增、删、改、查操作应会部完成了！