Spring boot: MongoDB: Working with Criteria object

Criteria class used to create queries by specifying the criteria.

Example

Query query = new Query();

query.addCriteria(Criteria.where("firstName").is("Phalgun"));

To Update user details where firstName is Phalgun

Step 1: Create Query instance.

Query query = new Query();

query.addCriteria(Criteria.where("firstName").is("Phalgun"));

Step 2: Create an instance of Update class. Update is used to construct mongoDB update clauses.

Update update = new Update();

update.set("firstName", "Ram");

update.set("lastName", "Gurram");

Step 3: Use MongoTemplate to update all the records that matches to given criteris.

MongoClient mongoClient = new MongoClient(host, port);

MongoTemplate mongoTemplate = new MongoTemplate(mongoClient, database);

mongoTemplate.updateMulti(query, update, Employee.class);

Find the below working application.

Employee.java

package com.sample.app.entity;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document("employees")
public class Employee {
	@Id
	private String id;

	private String firstName;

	private String lastName;
	
	public Employee() {}

	public Employee(String firstName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=")
				.append(lastName).append("]");
		return builder.toString();
	}

}

EmployeeRepository.java

package com.sample.app.repository;

import java.util.List;
import java.util.stream.Stream;

import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import org.springframework.stereotype.Repository;

import com.sample.app.entity.Employee;

@Repository
public interface EmployeeRepository extends MongoRepository<Employee, String> {
	List<Employee> findByFirstName(String firstName);
	
	List<Employee> findByLastName(String lastName);
	
	List<Employee> findByFirstNameAndLastName(String firstName, String lastName);
	
	@Query("{'firstName' : ?0}")
	Stream<Employee> findAllByCustomQueryAndStream(String firstName);
}

application.properties

spring.data.mongodb.database=myorg
spring.data.mongodb.port=27017
spring.data.mongodb.host=localhost

logging.level.org.springframework.data=WARN

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>springDataMongo</groupId>
	<artifactId>springDataMongo</artifactId>
	<version>1</version>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.6.RELEASE</version>
	</parent>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-mongodb</artifactId>
		</dependency>
	</dependencies>
</project>

App.java

package com.sample.app;

import java.util.List;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import com.mongodb.MongoClient;
import com.sample.app.entity.Employee;

import org.springframework.data.mongodb.core.query.*;

@SpringBootApplication
public class App {
	@Value("${spring.data.mongodb.database}")
	private String database;

	@Value("${spring.data.mongodb.host}")
	private String host;

	@Value("${spring.data.mongodb.port}")
	private int port;

	public static void main(String[] args) {

		SpringApplication.run(App.class, args);
	}

	public void dropPreviousData() {
		MongoClient mongoClient = new MongoClient(host, port);

		MongoOperations mongoOps = new MongoTemplate(mongoClient, database);

		mongoOps.dropCollection("employees");
	}

	@Bean
	public CommandLineRunner demo() {
		return (args) -> {

			dropPreviousData();

			MongoClient mongoClient = new MongoClient(host, port);
			MongoTemplate mongoTemplate = new MongoTemplate(mongoClient, database);

			Employee emp1 = new Employee("Phalgun", "Garimella");
			Employee emp2 = new Employee("Sankalp", "Dubey");
			Employee emp3 = new Employee("Arpan", "Garimella");
			Employee emp4 = new Employee("Phalgun", "Dubey");

			mongoTemplate.save(emp1);
			mongoTemplate.save(emp2);
			mongoTemplate.save(emp3);
			mongoTemplate.save(emp4);

			System.out.println("**************************************");
			List<Employee> emps = mongoTemplate.findAll(Employee.class);
			for (Employee emp : emps) {
				System.out.println(emp);
			}

			Query query = new Query();
			query.addCriteria(Criteria.where("firstName").is("Phalgun"));

			Update update = new Update();
			update.set("firstName", "Ram");
			update.set("lastName", "Gurram");

			mongoTemplate.updateMulti(query, update, Employee.class);

			System.out.println("\n**************************************");
			emps = mongoTemplate.findAll(Employee.class);
			for (Employee emp : emps) {
				System.out.println(emp);
			}
		};
	}
}

Total project structure looks like below.

Run App.java, you can see below messages in console.

**************************************
Employee [id=5d53855a98c4b253c1a66745, firstName=Phalgun, lastName=Garimella]
Employee [id=5d53855a98c4b253c1a66746, firstName=Sankalp, lastName=Dubey]
Employee [id=5d53855a98c4b253c1a66747, firstName=Arpan, lastName=Garimella]
Employee [id=5d53855a98c4b253c1a66748, firstName=Phalgun, lastName=Dubey]

**************************************
Employee [id=5d53855a98c4b253c1a66745, firstName=Ram, lastName=Gurram]
Employee [id=5d53855a98c4b253c1a66746, firstName=Sankalp, lastName=Dubey]
Employee [id=5d53855a98c4b253c1a66747, firstName=Arpan, lastName=Garimella]
Employee [id=5d53855a98c4b253c1a66748, firstName=Ram, lastName=Gurram]

You can download complete working application from this link.

    

Previous                                                    Next                                                    Home