準(zhǔn)備

npm install mongodb /*安裝mongodb模塊*/

一些mongodb命令

show dbs //展示所有數(shù)據(jù)庫(kù)
use db //使用該數(shù)據(jù)庫(kù),未創(chuàng)建則直接創(chuàng)建
db.documents.drop() //刪除該collection中所有數(shù)據(jù)(或者使用.remove()通過(guò)條件刪除)
db.documents.find() //查詢?cè)揷ollection中所有數(shù)據(jù)

連接mongodb

/*app.js*/
var MongoClient = require('mongodb').MongoClient
  , assert = require('assert');
/*assert模塊用于編寫(xiě)程序的單元測(cè)試用例*/

// Connection URL
var url = 'mongodb://localhost:27017/elys';/*請(qǐng)求url*/
// 通過(guò)mongodb提供的connect方法來(lái)連接數(shù)據(jù)庫(kù)
MongoClient.connect(url, function(err, db) { /*這里的db便是連接成功的mongodb*/
  assert.equal(null, err);/*表達(dá)式不符合時(shí)輸出err*/
  console.log("Connected correctly to server");

  db.close();
});

插入數(shù)據(jù)

/*新增一個(gè)用于插入數(shù)據(jù)的方法*/
var insertDocuments = function (db, callback){
    var collection = db.collection('documents')/*獲取collection*/
    collection.insertMany([/*操作語(yǔ)句*/
        {a:1}, {a:2}, {a:3}/*提供的數(shù)據(jù)*/
    ], function(err, result){/*回調(diào)*/
        assert.equal(err, null)
        assert.equal(3, result.result.n) /*檢查結(jié)果行為等(是不是真的3個(gè))*/
        assert.equal(3, result.ops.length)
        console.log("Inserted 3 documents into the document collection")
        callback(result) /*返回結(jié)果*/
    })
}

/*修改后的app.js*/
//...
console.log("Connected correctly to server");
/*調(diào)用該方法*/
  insertDocuments(db, function(){
    db.close();
  })
//...

更新數(shù)據(jù)

var updateDocument = function (db, callback){
    var collection = db.collection('documents')
    collection.updateOne({ a: 2 },{ $set: {b:1}}, function(err, result){
        /*mongodb提供許多api,updateOne()是其中之一*/
        assert.equal(err, null)
        assert.equal(1, result.result.n)
        console.log("Updated the document with thie field a equal to 2")
        callback(result)
    })
}

/*修改后的app.js*/
//...
console.log("Connected correctly to server");
/*調(diào)用該方法*/
 insertDocuments(db, function(){
    updateDocument(db, function(){
        db.close();
    })
  })
//...

刪除數(shù)據(jù)

var deleteDocument = function(db, callback){
    var collection = db.collection('documents')

    collection.deleteOne({a:3}, function(err, result){
        assert.equal(err, null)
        assert.equal(1, result.result.n)
        console.log("Remove the document with the field a equal to 3")
        callback(result)
        //console.log(result)
    })
}

/*修改后的app.js*/
//...
console.log("Connected correctly to server");
/*調(diào)用該方法*/
 insertDocuments(db, function(){
    updateDocument(db, function(){
        deleteDocument(db, function(){
            db.close();
        })
    })
  })
//...

查詢數(shù)據(jù)

var findDocuments = function(db, callback){
    var collection = db.collection('documents')

    collection.find({}).toArray(function(err, docs){
        assert.equal(err, null)
        assert.equal(2, docs.length)
        console.log("Found the following records")
        console.dir(docs)
        callback(docs)
    })
}

/*修改后的app.js*/
//...
console.log("Connected correctly to server");
/*調(diào)用該方法*/
 insertDocuments(db, function(){
    updateDocument(db, function(){
        deleteDocument(db, function(){
            findDocuments(db, function(){
                db.close();
            })
        })
    })
  })
//...

參考
https://github.com/mongodb/node-mongodb-native

未完待續(xù)