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我有一個問題node/express.js 我連接到數據庫,我從數據庫中回收數據並將它保存到'localhost:3000/interval'作爲res.send 。我想將它存儲到一個變量中,因此它在./interval處不可見,解析它並傳遞給Google Chart API以繪製圖表:)到目前爲止,我還沒有被這麼長時間卡住。請從DBExpress.js存儲響應數據庫數據
幫助:)數據
[{"CZAS":"2017-02-02 21:19:05","PM1":"28","PM25":"40","PM10":"48","ID":"300"},{"CZAS":"2017-02-03 07:17:07","PM1":"45","PM25":"69","PM10":"86","ID":"600"},{"CZAS":"2017-02-03 07:25:58","PM1":"67","PM25":"110","PM10":"139","ID":"900"},{"CZAS":"2017-02-03 07:35:11","PM1":"72","PM25":"121","PM10":"164","ID":"1200"}
這是從server.js
app.get('/interval', common.listPoints2);
從通用代碼。
exports.listPoints2 = function(req, res) {
var data = require('../data.js');
console.log("Getting list points " + req + " res " + res);
data.connect();
console.log("Conecnted ...");
data.fiveMinInterval(1, res);}
這裏是一個功能
exports.fiveMinInterval = function(req, res) {
var xys = [];
console.log("Get data from DB");
client.query('SELECT time AS CZAS, pm1 AS PM1, pm25 AS PM25, pm10 AS PM10, id AS ID FROM dev_0_data WHERE id%300=0')
.on('result', function(res) {
res.on('data', function(row) {
xys.push(row);
})
.on('error', function(err) {
console.log('Result error: ' + inspect(err));
})
.on('end', function(info) {
console.log('Result finished successfully');
});
})
.on('end', function() {
console.log("Get track points end");
res.send(xys);
});
}
1.是它打印在節點控制檯中; 結果成功完成 獲取跟蹤分數結束 2.注意到並更改; 嗯,我在想,也許我可以將它存儲到文件,然後用數據從數據庫讀取文件,但如果我有更多的傳感器,它將無法正常工作。 – Miczy
當您調用http:// localhost:3000/interval時,瀏覽器中顯示的內容是什麼? –
Welp,「來自DB的數據」 [{「CZAS」:「2017-02-02 21:19:05」,「PM1」:「28」,「PM25」:「40」,「PM10」:「 48「,」ID「:」300「}等 – Miczy