Nodejs连接mysql的增、删、改、查操作
一、准备
nodejs的教程,大多以操作mongodb为示例。但是mongodb有一些局限性,具体官网上有说。我打算用MySQL,因为多少还有点使用经验。先以研究为主。node-mysql,是目前最火的node下的mysql驱动。初步了用了一下,因为异步回调的这种方式,果然好多坑。
下面这个项目的package name是mysql,版本是mysql@ 2.5.4
先说明下面的所示代码,均已以下代码开头,后面不在说明
var connection = mysql.createConnection({
host: '127.0.0.1',
user: 'root',
password : 'root123',
port: '3306',
database: 'my_news_test',
});
代码什么意思很直白,如果想深入,可以去上面的官网查。像host,user之类的配置,写过MySQL数据库应用程序的,应该都很清楚,请自行修改相应参数。后面的代码,假定数据库”my_news_test”中有一个叫node_use的表,表有3个属性
id:自增主键
name:名字,有unique的限制
age
测试MySQLMySQL版本:5.5
二、建库并插入5条记录
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');
三、先测试一下环境
1、首先需要安装nodejs的mysql包
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)
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
1admin32
2dans8845
3张三35
4ABCDEF88
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();
varuserAddSql = 'INSERT INTO node_user(id,name,age) VALUES(0,?,?)';
varuserAddSql_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();
varuserGetSql = '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);
});
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();
varuserDelSql = '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);
});
connection.end();
运行的结果如下
D:\User\myappejs4>node mysqltest_del.js
-------------DELETE--------------
DELETE affectedRows 1
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