1,需要先引入mysql模块
可以先安装npm i -S mysql
2,在文件中引入
const mysql=require('mysql');
3,创建数据库连接池
//创建一个数据库连接池
let pool = mysql.createPool({
user:'root', //数据库user
connectionLimit:10 //初始化多少个
})
4,从数据库连接池中取出一个连接,并实现查询
pool.getConnection((err,connection)=>{
if (err) throw err;
let uname='yaya';
let upwd='123456';
let sql="SELECT * FROM xz.xz_user WHERE uname=? AND upwd= ?";
connection.query(sql,[uname,upwd],(err,result,fields)=>{
if(result.length>0){
console.log("登录成功");
}else{
console.log("登录失败");
}
})
connection.release();//查询完最后释放
})
也可以使用简化写法
let uname='tom';
let upwd='123';
let sql="SELECT * FROM xz.xz_user WHERE uname=?";
pool.query(sql,[uname],(err,result,fields)=>{
if(result.length>0){
let encryptedPwd = result[0].upwd;
if(bcrypt.compareSync(upwd,encryptedPwd)){
console.log("登录成功");
}else{
console.log("用户名或密码出错了");
}
}else{
console.log("登录失败");
}
})
5,添加操作
如果要用到密码加密功能的话,需要安装
npm install -S bcryptjs
const mysql = require('mysql');
const bcrypt = require('bcryptjs');
let uname = 'jeek';
let upwd = '123';
let salt = bcrypt.genSaltSync(10);
let encryptedPwd = bcrypt.hashSync(upwd, salt);
let sql = "INSERT INTO xz.xz_user (uname,upwd) VALUE(?,?)";
pool.query(sql,[uname, encryptedPwd],(err, result, fields)=>{
if (result.length > 0) {
console.log(result);
} else {
console.log(result);
}
})
6,修改操作
let uname='Mariks'
let uid=8;
let sql='UPDATE xz.xz_user SET uname=? WHERE uid=?'
pool.query(sql,[uname,uid],(err,result,fields)=>{
if(result.affectedRows==1){
console.log("修改成功")
}else{
console.log("修改失败,请联系管理员");
}
})
7,删除
let uid=8;
let sql="DELETE FROM xz.xz_user WHERE uid=?";
pool.query(sql,[uid],(err,result,fields)=>{
if(result.affectedRows==1){
console.log("删除成功");
}else{
console.log("删除失败,请联系管理员");
}
})
8,查询
//分页查询
let sql ="SELECT * FROM EMP LIMIT 10 OFFSET 0"
//模糊查询
let sql ="SELECT * FROM EMP WHERE uname LIKE '%$uname%"
http服务
const http = require('http');
let server=http.createServer((req,res)=>{
console.log(req.method);
console.log(req.url);
console.log(req.httpVersion);
console.log(req.headers);
//设置响应头消息
res.writeHead(200,{
'Content-Type':'text/html;charset=UTF-8',
'Cache-Control':'no-cache'
});
res.write('<h1>Hello world</h1>');
res.end();//结束消息响应
});
server.listen(3000);