MongoDB 的 CRUD
昨天我們引入了 mongoDB 今天來整理一下寫一個 module
按照慣例先來一個 Javascript 版本
src/mongoManager/index.js
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| const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017';
const dbName = 'myproject';
class mongoDBManagerClass {
initialDB({url, dbName}){
return new Promise((resolve) => {
MongoClient.connect(url, { useNewUrlParser: true }, (err, client) => {
this._client = client;
this._db = client.db(dbName);
this._document = this._db.collection('documents');
resolve();
});
});
}
insertManyDocument(array) {
return new Promise((resolve, reject) => {
this._document.insertMany(array,(error, result) => {
if(error) reject(error);
else resolve(result);
});
})
}
closeClient() {
this._client.close();
}
}
const mongoDBManager = new mongoDBManagerClass({url, dbName});
module.exports = mongoDBManager;
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src/app.js
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| const express = require('express');
const userRouter = require('./routes/usersRoutes');
const mongoDBManager = require('./mongodbManager');
const url = 'mongodb://localhost:27017';
const dbName = 'myproject';
mongoDBManager
.initialDB({url, dbName})
.then(() => {
return mongoDBManager.insertManyDocument([{a : 1}])
})
.then(() => mongoDBManager.closeClient());
const app = express();
const port = 5000;
app.use('/user', userRouter);
app.get('/', (req, res) => res.send('Hello World!'));
app.listen(port, () => console.log(`Example app listening on port ${port}!`));
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