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我有一个问题node/express.js 我连接到数据库,我从数据库中回收数据并将它保存到'localhost:3000/interval'作为res.send 。我想将它存储到一个变量中,因此它在./interval处不可见,解析它并传递给Google Chart API以绘制图表:)到目前为止,我还没有被这么长时间卡住。请从DBExpress.js存储响应数据库数据
帮助:)数据
[{"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"}
这是从server.js
app.get('/interval', common.listPoints2);
从通用代码。
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);}
这里是一个功能
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.是它打印在节点控制台中; 结果成功完成 获取跟踪分数结束 2.注意到并更改; 嗯,我在想,也许我可以将它存储到文件,然后用数据从数据库读取文件,但如果我有更多的传感器,它将无法正常工作。 – Miczy
当您调用http:// localhost:3000/interval时,浏览器中显示的内容是什么? –
Welp,“来自DB的数据” [{“CZAS”:“2017-02-02 21:19:05”,“PM1”:“28”,“PM25”:“40”,“PM10”:“ 48“,”ID“:”300“}等 – Miczy