nodejs MySQL操作

一  wamp创建数据库

选择phpMyAdmin

选择用户，添加用户

填写数据库详细资料，填写完毕选择右下角的“执行”

用户添加成功

2. nodejs 安装mysql驱动 

npm install mysql

 3 数据库操作CURD

连接数据库

index.js：

var mysql      = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘test‘,
    password : ‘123456‘,
    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);
});

运行后，输出结果：

  查询

新建表account用于测试：

index.js：

var mysql      = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘test‘,
    password : ‘123456‘,
    database : ‘test‘
});

connection.connect();

var  sql = ‘SELECT * FROM account‘;

connection.query(sql,function (err, result) {
    if(err){
        console.log(‘[SELECT ERROR] - ‘,err.message);
        return;
    }

    console.log(‘--------------------------SELECT----------------------------‘);
    console.log(result);
    console.log(result[0].id, result[0].name, result[0].age);
    console.log(‘------------------------------------------------------------\n\n‘);
});

connection.end();

输出结果：

 插入数据

index.js：

var mysql      = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘test‘,
    password : ‘123456‘,
    database : ‘test‘
});

connection.connect();

var  addSql = ‘INSERT INTO account(id,name,age) VALUES(3,?,?)‘;  //插入数据
var  addSqlParams = [‘baby‘,23];                                 //填写问号的数据
//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);   //插入结果
    console.log(‘-----------------------------------------------------------------\n\n‘);
});

connection.end();

运行结果，数据库增加了一条数据：

 更新数据

var mysql      = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘test‘,
    password : ‘123456‘,
    database : ‘test‘
});

connection.connect();

var modSql = ‘UPDATE account SET name = ?,age = ? WHERE id = ?‘;
var modSqlParams = [‘Lee‘, 31, 1];
//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();

运行结果：

  删除数据

var mysql      = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘test‘,
    password : ‘123456‘,
    database : ‘test‘
});

connection.connect();

var delSql = ‘DELETE FROM account where id=3‘;
//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();

运行结果，id=3的数据被删除：