Spring boot

Spring boot mongodb crud example

May 1, 2020
4 Min Read

Spring boot Mongodb curd using MongoRepository

MongoDB is an open-source NoSQL document database that uses a JSON-like schema instead of traditional table-based relational data.

Spring Boot offers several conveniences for working with MongoDB, including the spring-boot-starter-data-mongodb

Adding Mongodb Starter (pom.xml)

Just add spring-boot-starter-data-mongodb to your existing pom.xml, Spring boot will auto-configure all the necessary configuration from application.properties

	
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.spring-boot-mongodb</groupId>
	<artifactId>Spring-Boot-Mongo</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Spring-Boot-Mongo Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.4.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

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

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
		<finalName>Spring-Boot-Mongo</finalName>
	</build>
</project>

Extending MongoRepository (UserRepository.java)

Spring Data includes repository support for MongoDB. As with the Mongo repositories, queries are constructed automatically, based on method names.

Repository base implementation for Mongo.
package com.candidjava.spring.repository;

import org.springframework.data.mongodb.repository.MongoRepository;
import com.candidjava.spring.bean.User;
public interface UserRepository extends MongoRepository<User,String> {

}

MongoDB Configuration (application.yml)

You can specify connection details using discrete properties in application.yml or application.properties

spring:
 data:
  mongodb:
   host: localhost
   port: 27017
   database: sampledb
server:
  port : 9090

Adding Document class (User.java)

When working with MongoDB JPA @Entity will be replaced by @Document(collection = “user”)

package com.candidjava.spring.bean;

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

@Document(collection = "user")
public class User {
 @Id
 private String id;

 private String country;

 private String name;

 public User() {

 }

 public User(String id, String country, String name) {
  this.id = id;
  this.country = country;
  this.name = name;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getCountry() {
  return country;
 }

 public void setCountry(String country) {
  this.country = country;
 }

 public String getId() {
  return id;
 }

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

}

}

UserService.java

package com.candidjava.spring.service;

import java.util.List;
import java.util.Optional;

import com.candidjava.spring.bean.User;

public interface UserService {
 public void createUser(User user);
 public List<User> getUser();
 public Optional<User> findById(String id);
 public User update(User user, String l);
 public void deleteUserById(String id);
 public User updatePartially(User user, String id);
}

UserServiceImpl.java

package com.candidjava.spring.service;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.candidjava.spring.bean.User;
import com.candidjava.spring.repository.UserRepository;

@Service
@Transactional
public class UserServiceImpl implements UserService {
 @Autowired
 UserRepository userRepository;

 public void createUser(User user) {
  // TODO Auto-generated method stub
  userRepository.save(user);
 }

 public List<User> getUser() {
  // TODO Auto-generated method stub
  return (List<User>) userRepository.findAll();
 }

 public Optional<User> findById(String id) {
  // TODO Auto-generated method stub
  return userRepository.findById(id);
 }

 public User update(User user, String l) {
  // TODO Auto-generated method stub
  return userRepository.save(user);
 }

 public void deleteUserById(String id) {
  // TODO Auto-generated method stub
  userRepository.deleteById(id);
 }

 public User updatePartially(User user, String id) {
  // TODO Auto-generated method stub
  Optional <User> usr = findById(id);
  User singleUser = usr.get();
  singleUser.setCountry(user.getCountry());
  return userRepository.save(singleUser);
 }



}

Launch as Spring Boot (Application.java)

package com.candidjava;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class, args);
 }

}

UserController.java

package com.candidjava.spring.controller;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.util.UriComponentsBuilder;

import com.candidjava.spring.bean.User;
import com.candidjava.spring.service.UserService;

@RestController
@RequestMapping(value = {"/", "/user"})
public class UserController {
 @Autowired
 UserService userService;
 @GetMapping(value = "/", produces = MediaType.APPLICATION_JSON_VALUE)
 public String get() {
  return "Please give url as Spring-Boot-Rest/user/get";

 }
 @GetMapping(value = "/{id}", produces = MediaType.APPLICATION_JSON_VALUE)
 public ResponseEntity<User> getUserById(@PathVariable("id") String id) {
  System.out.println("Fetching User with id " + id);
  Optional<User> usr = userService.findById(id);
  User user = usr.get();
  if (user == null) {
   return new ResponseEntity<User> (HttpStatus.NOT_FOUND);
  }
  return new ResponseEntity<User> (user, HttpStatus.OK);
 }

 @PostMapping(value = "/create", headers = "Accept=application/json")
 public ResponseEntity<Void> createUser(@RequestBody User user, UriComponentsBuilder ucBuilder) {
  System.out.println("Creating User " + user.getName());
  userService.createUser(user);
  HttpHeaders headers = new HttpHeaders();
  headers.setLocation(ucBuilder.path("/user/{id}").buildAndExpand(user.getId()).toUri());
  return new ResponseEntity<Void> (headers, HttpStatus.CREATED);
 }

 @GetMapping(value = "/get", headers = "Accept=application/json")
 public List<User> getAllUser() {
  List<User> tasks = userService.getUser();
  return tasks;

 }

 @PutMapping(value = "/update", headers = "Accept=application/json")
 public ResponseEntity<String> updateUser(@RequestBody User currentUser) {
  System.out.println("sd");
  Optional<User> usr = userService.findById(currentUser.getId());
  User user = usr.get();
  if (user == null) {
   return new ResponseEntity<String> (HttpStatus.NOT_FOUND);
  }
  userService.update(currentUser, currentUser.getId());
  return new ResponseEntity<String> (HttpStatus.OK);
 }

 @DeleteMapping(value = "/{id}", headers = "Accept=application/json")
 public ResponseEntity<User> deleteUser(@PathVariable("id") String id) {
  Optional<User> usr = userService.findById(id);
  User user = usr.get();
  if (user == null) {
   return new ResponseEntity<User> (HttpStatus.NOT_FOUND);
  }
  userService.deleteUserById(id);
  return new ResponseEntity<User> (HttpStatus.NO_CONTENT);
 }

 @PatchMapping(value = "/{id}", headers = "Accept=application/json")
 public ResponseEntity<User> updateUserPartially(@PathVariable("id") String id, @RequestBody User currentUser) {
  Optional<User> usr1 = userService.findById(id);
  User user = usr1.get();
  if (user == null) {
   return new ResponseEntity<User> (HttpStatus.NOT_FOUND);
  }
  User usr = userService.updatePartially(currentUser, id);
  return new ResponseEntity<User> (usr, HttpStatus.OK);
 }
}

Download

Download source code from my github account Click here

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Mathan Lal