How to test MongoDB connection? - mongodb

Question

How do I test a MongoDB connection? Here is my code:
class MongoDB(val SERVER:String, val PORT:Int, val DATABASE: String, val COLLECTION: String){
def establishConnection(): MongoCollection = {
val mongoClient = MongoClient(SERVER, PORT)
println("MongoDB client connection: "+ mongoClient)
val db_handle = mongoClient(DATABASE)
println("Connected to DB : "+ DATABASE)
println("Collections present are :")
println(db_handle.collectionNames)
assert (establishConnection.size > 0 )
db_handle(COLLECTION)
}
def insert(collection : MongoCollection, document : MongoDBObject) : Unit = {
println(collection.insert(document))
}
def find(collection : MongoCollection) = {
println("In find query() :")
val cursor = collection.find()
cursor.toList
}
def find(collection : MongoCollection, obj : MongoDBObject) = {
println("In find query() with condition:")
val cursor = collection.find(obj)
cursor.toList
}
def findOne(collection : MongoCollection) ={
println("In findOne query() :")
val cursor = collection.findOne()
cursor.toList
}
def findOne(collection: MongoCollection, obj : MongoDBObject) ={
println("In findOne query() with condition:")
val cursor = collection.findOne(obj)
cursor.toList
}
def update(collection : MongoCollection, query : MongoDBObject, update : MongoDBObject) = {
val result = collection.update(query, update) //update or findAndModify can be used
result
}
def delete(collection : MongoCollection, query : MongoDBObject) = {
val result = collection.findAndRemove(query);
result
}
}

Answer 1

You can use embedded mongo it's written in java, it first downloads mongo and stores it in home directory ( it downloads only for very first time) and then runs it, you can choose mongoDB version, here is a sample project how to use it from scala test https://github.com/SimplyScala/scalatest-embedmongo.