1、安装驱动
使用 npm 进行安装 mysql
$ npm install mysql
2、连接数据库
在以下实例中根据你的实际配置修改数据库用户名、及密码及数据库名:
test.js 文件
var mysql = require('mysql');
var connection = mysql.createConnection({host : 'localhost',user : 'root',password : '123456789',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);
});
执行以下命令输出结果为:
$ node test.js
The solution is: 2
3、数据库操作( CURD )
在进行数据库操作前,你需要提供 Websites 表 SQL 文件websites.sql 导入到你的 MySQL 数据库中。
/*Navicat MySQL Data TransferSource Server : 127.0.0.1Source Server Version : 50621Source Host : localhostSource Database : RUNOOBTarget Server Version : 50621File Encoding : utf-8Date: 08/10/2023 16:44:07 PM
*/SET NAMES utf8;
SET FOREIGN_KEY_CHECKS = 0;-- ----------------------------
-- Table structure for `websites`
-- ----------------------------
DROP TABLE IF EXISTS `websites`;
CREATE TABLE `websites` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` char(20) NOT NULL DEFAULT '' COMMENT '站点名称',`url` varchar(255) NOT NULL DEFAULT '',`alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa 排名',`country` char(10) NOT NULL DEFAULT '' COMMENT '国家',PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;-- ----------------------------
-- Records of `websites`
-- ----------------------------
BEGIN;
INSERT INTO `websites` VALUES ('1', 'Google', 'https://www.google.cm/', '1', 'USA'), ('2', '淘宝', 'https://www.taobao.com/', '13', 'CN'), ('3', '菜鸟教程', 'http://www.runoob.com/', '4689', 'CN'), ('4', '微博', 'http://weibo.com/', '20', 'CN'), ('5', 'Facebook', 'https://www.facebook.com/', '3', 'USA');
COMMIT;SET FOREIGN_KEY_CHECKS = 1;
这里测试的 MySQL 用户名为 root,密码为 123456,数据库为 test,需要根据自己配置情况修改。
(1)查询数据
将上面我们提供的 SQL 文件导入数据库后,执行以下代码即可查询出数据
var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : '123456', port: '3306', database: 'test'
}); connection.connect();var sql = 'SELECT * FROM websites';
//查
connection.query(sql,function (err, result) {if(err){console.log('[SELECT ERROR] - ',err.message);return;}console.log('--------------------------SELECT----------------------------');console.log(result);console.log('------------------------------------------------------------\n\n');
});connection.end();
执行以下命令输出就结果为
$ node test.js --------------------------SELECT---------------------------- [ RowDataPacket {id: 1,name: 'Google',url: 'https://www.google.cm/',alexa: 1,country: 'USA' },RowDataPacket {id: 2,name: '淘宝',url: 'https://www.taobao.com/',alexa: 13,country: 'CN' },RowDataPacket {id: 3,name: '菜鸟教程',url: 'http://www.runoob.com/',alexa: 4689,country: 'CN' },RowDataPacket {id: 4,name: '微博',url: 'http://weibo.com/',alexa: 20,country: 'CN' },RowDataPacket {id: 5,name: 'Facebook',url: 'https://www.facebook.com/',alexa: 3,country: 'USA' } ] ------------------------------------------------------------
(2)插入数据
可以向数据表 websties 插入数据
var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : '123456', port: '3306', database: 'test'
}); connection.connect();var addSql = 'INSERT INTO websites(Id,name,url,alexa,country) VALUES(0,?,?,?,?)';
var addSqlParams = ['菜鸟工具', 'https://c.runoob.com','23453', 'CN'];
//增
connection.query(addSql,addSqlParams,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('-----------------------------------------------------------------\n\n');
});connection.end();
执行以下命令输出就结果为
$ node test.js --------------------------INSERT---------------------------- INSERT ID: OkPacket {fieldCount: 0,affectedRows: 1,insertId: 6,serverStatus: 2,warningCount: 0,message: '',protocol41: true,changedRows: 0 } -----------------------------------------------------------------
(3)更新数据
可以对数据库的数据进行修改
var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : '123456', port: '3306', database: 'test'
}); connection.connect();var modSql = 'UPDATE websites SET name = ?,url = ? WHERE Id = ?';
var modSqlParams = ['菜鸟移动站', 'https://m.runoob.com',6];
//改
connection.query(modSql,modSqlParams,function (err, result) {if(err){console.log('[UPDATE ERROR] - ',err.message);return;} console.log('--------------------------UPDATE----------------------------');console.log('UPDATE affectedRows',result.affectedRows);console.log('-----------------------------------------------------------------\n\n');
});connection.end();
执行以下命令输出就结果为:
--------------------------UPDATE----------------------------
UPDATE affectedRows 1
-----------------------------------------------------------------
执行成功后,查看数据表,即可以看到更新的数据
(4)删除数据
可以使用以下代码来删除 id 为 6 的数据
var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : '123456', port: '3306', database: 'test'
}); connection.connect();var delSql = 'DELETE FROM websites where id=6';
//删
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('-----------------------------------------------------------------\n\n');
});connection.end();
执行以下命令输出就结果为
--------------------------DELETE---------------------------- DELETE affectedRows 1 -----------------------------------------------------------------
执行成功后,查看数据表,即可以看到 id=6 的数据已被删除