nedb -动态创建数据库

Question

我有两个临时工。我和我的树莓派上的传感器有一个node.js Express应用程序。我想用传感器对象动态创建数组的nedb数据库。

所以我有一个带有传感器的物体：

  sensors: [
    {
      name: "Indoor",
      type: 22,
      pin: 21
    },
    {
      name: "Outdoor",
      type: 22,
      pin: 21
    }
  ]};

现在我想为每个传感器创建三个数据库：

databaseSetup(app.sensors);

function databaseSetup(sensor){
  const dataStore = require('nedb');
  const databaseVariables = [];
  sensor.forEach((sensor) => {
    const live = 'live' + sensor.name;
    const seconds = 'seconds' + sensor.name;
    const hours = 'hours' + sensor.name;
    const test = { 
    live: new dataStore(`./databases/temp/${sensor.name}/live.db`),
    seconds: new dataStore(`./databases/temp/${sensor.name}/seconds.db`),
    hours: new dataStore(`./databases/temp/${sensor.name}/hours.db`) }
    databaseVariables.push(test);
  });
} 

但这是行不通的。有人能帮帮我吗？

Answer 1

我不知道你为什么要这样做，因为在我看来，这是一种糟糕的做法。但是你可以让它动态化。如下所示：

const dt = require('nedb');
const db = [];

//USING LOOP and FUNCTION
let list = [{ name: "GasSensor" }, { name: "TempSensor" }];
let index = 0;

//BAD Practice
let setup = () => {
    if (index + 1 > list.length) return;

    let newInstance = new dt({ filename: 'nodejs/data/nedb_' + list[index].name, autoload: true });

    console.log("Working on index " + (index + 1));

    newInstance.loadDatabase((err) => {
        if (err) {
            //...
        } else {
            db.push(newInstance);
        }

        index++;
        setup();
    });
}

setup();

还可以使用API：

const exp = require("express");
const app = exp();
const dt = require('nedb');
const db = [];

app.get("/make/db/:name", (q, r) => {
    //BAD PRACTICE
    //JUST FOR TEST
    let newInstance = new dt({ filename: 'nodejs/data/nedb_' + q.params.name, autoload: true });

    newInstance.loadDatabase((err) => {
        if (err) {
            console.log(err + "");
            r.send("ERROR");
        }
        else {
            db.push(newInstance);
            console.log("Database is loaded");
            r.send("NEW DB CREATED");
        }
    });
});

app.listen(3000);

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