http://www.javahotchocolate.com/notes/mongodb-crud.html
// a json file instance
{
"_id" : ObjectId("58fe900477c8d1afd3bdbf95"),
"word" : "mvc",
"urls" : [
"http://stackoverflow.com/questions/43580834/creating-sms-gateway-using-asp-net-mvc",
"http://stackoverflow.com/questions/43580390/c-sharp-mvc-redirecttoaction-and-browser-navigation-buttons"
]
}
push a element into array
//query obj that need update
DBObject oneQuery = occurence.findOne(new BasicDBObject("word", "mvc"));
//martch parameter
BasicDBObject match = new BasicDBObject();
match.put("_id", oneQuery.get("_id"));
//update parameter
BasicDBObject newUrl = new BasicDBObject();
newUrl.put("urls", url);
BasicDBObject update = new BasicDBObject();
update.put("$push", newUrl); //use $push to push new url to url array
//update
collection.update(match, update);
