Question

Develop a function to read a document in the MongoDB database “city” in the collection “inspections.” Be sure it can handle error conditions gracefully.
a. Input -> arguments to function should be the key/value lookup pair to use with the MongoDB driver find API call
b. return -> result in JSON format if successful else MongoDB returned error message

Answer 1

1) Here I am using Java to create a method which would get retire data from mongo db based on key/value argument

// getDataFromMongoDB is a method that would take two arguments of string type

public JSONObject getDataFromMongoDB(string key,string value){

// Initialize name of mongo database

String mongoDB="city";

//initialize name of mongo db collection

string mongoCollection="inspections";

// Connection string to mongo db that takes a end point to mongo db

MongoClientURI connectionString = new MongoClientURI("mongodb://localhost:27017");

//create object of mongoclient class

MongoClient mongoClient = new MongoClient(connectionString);

// Get object of mongo database

MongoDatabase database = mongoClient.getDatabase(mongoDB);

//Get the mongo collection object

MongoCollection<Document> collection = database.getCollection(mongoCollection);

// Find the first document in which key-value pair is matched

Document myDoc = collection.find(eq(key, value)).first();

//convert myDoc to json object and return

return myDoc.toJson();

}