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Node.js 连接 MySQL 并进行数据库操作
通常在NodeJS开发中我们经常涉及到操作数据库,尤其是 MySQL ,作为应用最为广泛的开源数据库则成为我们的首选,本篇就来介绍下如何通过NodeJS来操作 MySQL 数据库。 安装MySQL模块到NodeJS中 我们需要让NodeJS支持MySQL,则需要将MySQL模块添加到系统支持库
安装 node-mysql
$ npm install mysql
创建测试表
//数据库名 NodeSampleCREATE TABLE `NodeSample`.`MyTable` ( `id` INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY , `firstname` VARCHAR( 20 ) NOT NULL , `lastname` VARCHAR( 20 ) NOT NULL , `message` TEXT NOT NULL ) ENGINE = MYISAM ;
连接数据库
var sys = require(‘sys‘); var Client = require(‘mysql‘).Client; var client = new Client(); client.user = ‘someuser‘; client.password = ‘password‘; client.connect(function(error, results) { if(error) { console.log(‘Connection Error: ‘ + error.message); return; } console.log(‘Connected to MySQL‘); });
打开数据库
ClientConnectionReady = function(client) { client.query(‘USE NodeSample‘, function(error, results) { if(error) { console.log(‘ClientConnectionReady Error: ‘ + error.message); client.end(); return; } }); };
完成数据库操作程序
var sys = require(‘sys‘); var Client = require(‘mysql‘).Client; var client = new Client(); client.user = ‘someuser‘; client.password = ‘password‘; console.log(‘Connecting to MySQL...‘); client.connect(function(error, results) { if(error) { console.log(‘Connection Error: ‘ + error.message); return; } console.log(‘Connected to MySQL‘); ClientConnectionReady(client); }); ClientConnectionReady = function(client) { client.query(‘USE NodeSample‘, function(error, results) { if(error) { console.log(‘ClientConnectionReady Error: ‘ + error.message); client.end(); return; } ClientReady(client); }); }; ClientReady = function(client) { var values = [‘Chad‘, ‘Lung‘, ‘Hello World‘]; client.query(‘INSERT INTO MyTable SET firstname = ?, lastname = ? , message = ?‘, values, function(error, results) { if(error) { console.log("ClientReady Error: " + error.message); client.end(); return; } console.log(‘Inserted: ‘ + results.affectedRows + ‘ row.‘); console.log(‘Id inserted: ‘ + results.insertId); } ); GetData(client); } GetData = function(client) { client.query( ‘SELECT * FROM MyTable‘, function selectCb(error, results, fields) { if (error) { console.log(‘GetData Error: ‘ + error.message); client.end(); return; } // Uncomment these if you want lots of feedback //console.log(‘Results:‘); //console.log(results); //console.log(‘Field metadata:‘); //console.log(fields); //console.log(sys.inspect(results)); if(results.length > 0) { var firstResult = results[0]; console.log(‘First Name: ‘ + firstResult[‘firstname‘]); console.log(‘Last Name: ‘ + firstResult[‘lastname‘]); console.log(‘Message: ‘ + firstResult[‘message‘]); } }); client.end(); console.log(‘Connection closed‘); };
Node.js 连接 MySQL 并进行数据库操作
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