NarwhalMongoDB的JavaScript驱动

Narwhal 为 CommonJS 提供了访问 MongoDB 数据库的封装器。

示例代码：

var MongoDB = require("mongodb");

var db = new MongoDB.Mongo().getDB("mydb");



var colls = db.getCollectionNames();

colls.forEach(function(el) { print(el); });



var coll = db.getCollection("testCollection");

coll.drop();



var doc = {

   "name" : "MongoDB",

   "type" : "database",

   "count" : 1,

   "info" : {

               x : 203,

               y : 102

             }

}



coll.insert(doc)

myDoc = coll.findOne();

print(myDoc);



// Now, lets add lots of little documents to the collection so we can explore queries and cursors

for (var i=0; i < 100; i++) {

    coll.insert({"i": i});

}



print(coll.getCount());



// Let's get all the documents in the collection and print them out



var cur = coll.find();

while(cur.hasNext()) {

    print(cur.next());

}



// Now use a query to get 1 document out



var query = { i: 71 };

cur = coll.find(query);



while(cur.hasNext())

    print(cur.next());



// Now use a query to get a larger set



query = { "i": { "$gt": 50 } };  // i.e. find all where i > 50

cur = coll.find(query);



while(cur.hasNext())

    print(cur.next());