MongoDB操做

MongoDB

1. 加載 mongodb

   const MongoClient = require('mongodb').MongoClient;
    const resuleSet = require('./resultSet');
    
    //數據庫地址
    const url = 'mongodb://localhost:27017';
    //數據庫名稱
    const dbName = 'user';
    
    let db = {};

2. 鏈接數據庫

   MongoClient.connect(url, function(err, client) {
      db = client.db(dbName);
    });

3. 數據庫操做

   module.exports = {
      //collection爲集合,filter爲過濾,data爲數據
      //獲取數據
      async select(collection, filter = {}) {
        //db.collection.find()該方法獲取多條數據
        const result = await db.collection(collection).find(filter).toArray();
        return resuleSet(result.length > 0, result);
      },
    
      //添加數據
      async insert(collection, data) {
        //db.collection.insert()該方法插入一條或多條數據
        const result = await db.collection(collection).insert(data);
        return resuleSet(result.length > 0, result);
      },
    
      //更新數據
      async update(collection, filter, data) {
        //db.collection.update()該方法更新多條數據
        const result = await db.collection(collection).update(filter, data);
        return resuleSet(result.length > 0, result);
      },
    
      //刪除數據
      async delete(collection, filter) {
        //db.collection.deleteOne() 該方法從集合中刪除單個文檔
        const result = await db.collection(collection).deleteOne(filter);
        return resuleSet(result.length > 0, result);
      },
    };