NodeJS写了接口,客户端不停调用这个接口获取数据,大概每次访问到100的时候就会报个错(TCP.onRead),整个Node服务端都会奔溃。
找了半天发现原来是client.end()放置的位置不对,应该在返回数据之前,而我放在最后,根本不会调用到,所以连接数据库的客户端不断增大。
- router.get('/getpoisummary',function(req,res) {
- var ptx = req.query["x"];
- var pty = req.query["y"];
- var radius = req.query["r"];
- if (radius > 5000){
- res.writeHead(200,{'Content-Type':'text/plain;charset=utf-8'});
- return res.end('{"status":"Failed","message":"radius is larger than 5000 meters"}');
- }
- <span style="white-space:pre"> </span>var constring = "";
- var client = new pg.Client(constring);
- client.connect(function(err){
- client.query("",function(err,result){
- var rowcount = result.rowCount;
- var nowdate = new Date();
- console.log("query succeed : " + nowdate + ",return record num : " + rowcount);
- if (rowcount == 0) {
- res.writeHead(200,{'Content-Type':'text/plain;charset=utf-8'});
- return res.end('{"status":"Failed"}');
- }
- else
- {
- var outstr = '{"status":"ok","records":[';
- for(var ii=0; ii < rowcount; ii++) {
- var row = result.rows[ii];
- outstr += "";
- }
- outstr = outstr.substr(0,outstr.length - 1);
- outstr += ']}';
- res.writeHead(200,{'Content-Type':'text/plain;charset=utf-8'});
- return res.end(outstr);
- }
- client.end();
- });
- });
- });