标签:node function err res req 接口 let mysql query
const express = require('express'); //调用模块 const app = express(); const server = app.listen(3000,function(){console.log('服务启动成功!');}); const io = require('socket.io')(server); const mysql = require('mysql'); app.all('*', function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers", "X-Requested-With"); res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS"); res.header("X-Powered-By",' 3.2.1') res.header("Content-Type", "text/plain"); next(); }); io.on('connection',function ( socket ) { console.log('连接成功'); setInterval( ()=>{ socket.emit('sendMsg',sendMsg()) },1000); function sendMsg(){ return (Math.floor( Math.random()*100 )) + '-from server.'; } });const connection = mysql.createConnection({ host : 'localhost', user : 'root', password : 'root', port : '3306', database : 'ngfw' }); connection.connect();
// var WebSocketServer = require('ws').Server, // wss = new WebSocketServer({ port: 666 }); // wss.on('connection', function (ws) { // console.log('success') // var cont ; // ws.on('message', function (message) { // console.log(message,'wes'); // cont = message; // cont += 'from server'; // ws.send(cont); // }); // setInterval( ()=>{ // var rand = Math.round( Math.random()*100 ); // ws.send(rand+'-from server'); // },1000) // }); //用户管理
//验证查询数据是否存在 function allCheck( username ) { let sql = 'select * from usermanager where username = ? ' , queryall = [username]; return new Promise((resove ,reject)=>{ connection.query(sql , queryall , function (err , result) { if(err){ console.log('查询失败!'); return; }else{ if( result.length == 0 ){ resove( false ); }else{ resove( true ); } } }); }); }; app.get('/usermanager', function (req, res) { let sql = '' ,queryParams = []; if( req.query.type != undefined && ( req.query.type == '管理员' || req.query.type == '普通用户') ){ sql = 'SELECT * FROM usermanager where usertype = ?',queryParams = [req.query.type]; }else{ sql = 'SELECT * FROM usermanager'; }; //查 connection.query(sql,queryParams,function (err, result) { if(err){ console.log('[SELECT ERROR] - ',err.message); return; }else{ console.log('后台数据查寻成功!'); res.send(result); } }); }); let count = 0; app.get('/usermanager/add', async function (req, res) { count+=1; let sf = count % 2 == 0 ? '管理员' : '普通用户'; let reqs = {username:'eth'+count , usertype:sf,userdesc:sf,vaddress:'192.168.1.'+count,otherinfo:'admin',status:false}; let addSql = `INSERT INTO usermanager(username,usertype,userdesc,vaddress,otherinfo,status) VALUES(?,?,?,?,?,?)`; let hasNum = await allCheck( reqs.username ); if( hasNum ){ res.send('用户已经存在,添加失败'); return; }else{ let addSqlParam = Object.values(reqs); connection.query(addSql,addSqlParam,function(err,result){ if(err){ console.log(err); res.send('error add');return; }else{ res.send('添加成功'); return count; } }) } }); app.get('/usermanager/update', async function (req,res) { if(! req.query.hasOwnProperty('username') ){ res.send('传入参数为空!'); return; }; let tmp = req.query; let update = ` UPDATE usermanager SET usertype = ?, userdesc = ?, vaddress = ? ,otherinfo = ? ,status = ? WHERE username = ?`; let updateParam = [ tmp.usertype ,tmp.userdesc,tmp.vaddress,tmp.otherinfo,tmp.status,tmp.username]; let hasContains = await allCheck(tmp.username); if( hasContains ){ connection.query( update , updateParam , function (err,result) { if(err){ res.send('更新失败'+err); return; }else{ res.send('更新成功!'); } }); }else{ res.send('更新用户不存在'); } });
function deleteData( param ){ app.get('/usermanager/'+param.types, async function (req,res) { if( req.query.hasOwnProperty('username')){ }else{ return; } let delSql = ` DELETE FROM ${param.table} WHERE username = ? `, delParams = [ req.query.username ]; let hasContains = await allCheck(req.query.username); if( hasContains ){ connection.query(delSql , delParams, function (err ,result) { if(err){ res.send('删除失败',err); return; }else{ res.send('删除成功!'); } }); }else{ console.log(' user no found') res.send('删除用户不存在!') } }); } deleteData({ types:'delete', table:'usermanager' });
app.post('/usermanager/allgroup',function (req,res) { console.log('ssss'); let sql = `SELECT * FROM allgroup`; connection.query(sql,function (err,result){ if(err){ return; } res.send( JSON.stringify(result) ); }) })
标签:node,function,err,res,req,接口,let,mysql,query 来源: https://www.cnblogs.com/lkkk/p/12357302.html
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