Spring Data MongoDB : Query document

	User user = new User("...");
 
	//get first found record, from "test" collection, where id = "1001"
	User user = mongoOperation.findOne("test", new Query(Criteria
		.where("id").is("1001")), User.class);
 
	//get all found records, from "test" collection, where id <= "1000" abs age = 21
	List<User> users = mongoOperation.find("test", new Query(Criteria
		.where("id").lte("2001").and("age").is(21)), User.class);
 
	//get all records from "test" collection
	List<User> users = mongoOperation.getCollection("test", User.class);

public class User {
 
	private String id;
	private String firstname;
	private String lastname;
	private int age;
 
       //getter, setters and constructors 
}

package com.mkyong.core;
 
import java.util.ArrayList;
import java.util.List;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.document.mongodb.MongoOperations;
import org.springframework.data.document.mongodb.query.Criteria;
import org.springframework.data.document.mongodb.query.Query;
 
import com.mkyong.config.SpringMongoConfig;
import com.mkyong.user.User;
 
public class QueryDocumentApp {
 
	public static void main(String[] args) {
		// For Annotation
		ApplicationContext ctx = new AnnotationConfigApplicationContext(
				SpringMongoConfig.class);
		MongoOperations mongoOperation = (MongoOperations) ctx
				.getBean("mongoTemplate");
 
		User user1 = new User("2000", "user2000", "mkyong", 20);
		User user2 = new User("2001", "user2001", "mkyong", 21);
		User user3 = new User("2002", "user2002", "mkyong", 22);
 
		List<User> userList = new ArrayList<User>();
		userList.add(user1);
		userList.add(user2);
		userList.add(user3);
		mongoOperation.insertList("test", userList);
 
		// Case 1 ... where id = 2000
		System.out.println("Case 1...");
 
		User userPrint1 = mongoOperation.findOne("test", new Query(Criteria
				.where("id").is("2000")), User.class);
 
		System.out.println(userPrint1);
 
		// Case 2 ... where id <= 2001 and age = 21
		System.out.println("Case 2...");
 
		List<User> users = mongoOperation.find("test", new Query(Criteria
				.where("id").lte("2001").and("age").is(21)), User.class);
 
		for (User temp : users) {
			System.out.println(temp);
		}
 
		// Case 3 ... where id <= 2001 and age = 21
		System.out.println("Case 3...");
 
		List<User> users2 = mongoOperation.getCollection("test", User.class);
 
		for (User temp : users2) {
			System.out.println(temp);
		}
		System.out.println("total number of users : " + users2.size());
 
	}
 
}

Case 1...
User [id=2000, firstname=user2000, lastname=mkyong, age=20]
Case 2...
User [id=2001, firstname=user2001, lastname=mkyong, age=21]
Case 3...
User [id=2000, firstname=user2000, lastname=mkyong, age=20]
User [id=2001, firstname=user2001, lastname=mkyong, age=21]
User [id=2002, firstname=user2002, lastname=mkyong, age=22]
total number of users : 3