How To Find A Document in MongoDB Collection in Java Applications?
In this tutorial, we will see how to find a document in MongoDB in Java applications.
To insert a document in the MongoDB collection, first, we should have a MongoClient. Let’s see how to create one. Or You can read more at How to Connect to a MongoDB Atlas Cluster in a Java Application
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String connectionString = "mongodb+srv://user123:password123@cluster0.example.mongodb.net/?retryWrites=true&w=majority";
MongoClient mongoClient = MongoClients.create(connectionString);
The above connectionString is just an example, kindly get your valid connection String.
We can find the documents in MongoDB collection using find() and find().first() methods.
Let’s see how to find documents in the MongoDB collection using the find() method first.
Finding documents in MongoDB collection using the find() method
The find() method accepts a query filter and returns documents that match the filter.
In the following code, we will try to find all the students who have dues greater than 250 and status as checking.
Java Code to Find Documents in a Collection
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MongoDatabase database = mongoClient.getDatabase("texas_school");
MongoCollection<Document> collection = database.getCollection("students");
try(MongoCursor<Document> cursor = collection.find(
and(gte("due", 250),eq("status","checking")))
.iterator())
{
while(cursor.hasNext()) {
System.out.println(cursor.next().toJson());
}
}
Finding a document in mongodb collection using the find().first() method
The find().first() method accepts a query filter and returns the first document that matches the filter.
In the following code, we will try to find the first student who has dues greater than 250 and status as checking.
Java Code to Find Single Documents in a Collection
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MongoDatabase database = mongoClient.getDatabase("texas_school");
MongoCollection<Document> collection = database.getCollection("students");
Document doc = collection.find(Filters.and(
gte("due", 1000), Filters.eq("status", "checking"))).first();
System.out.println(doc.toJson());
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