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How can data be transferred from MySQL to MongoDB using Spring Boot?

asked 2023-06-05 10:59:53 +0000

plato gravatar image

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answered 2023-06-05 11:11:02 +0000

qstack gravatar image

To transfer data from MySQL to MongoDB using Spring Boot, you can follow these steps:

  1. Create a Spring Boot project with MySQL and MongoDB dependencies.

  2. Define models for MySQL and MongoDB entities.

  3. Use the Spring Data JPA to connect to the MySQL database and retrieve the data you want to transfer.

  4. Use the Spring Data MongoDB to connect to the MongoDB database and insert the retrieved data.

  5. Use a service class to handle the data transfer between databases.

  6. Implement a controller class to handle the HTTP requests for the data transfer.

  7. Test the data transfer by running the Spring Boot application.

Here is an example of how to transfer data from MySQL to MongoDB using Spring Boot:

Step 1: Create a Spring Boot project with MySQL and MongoDB dependencies

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

Step 2: Define models for MySQL and MongoDB entities

//MySQL entity
@Entity
public class User {
   @Id
   private Long id;
   private String name;
   private String email;
   //getters and setters
}

//MongoDB entity
@Document(collection = "users")
public class MongoUser {
   @Id
   private String id;
   private String name;
   private String email;
   //getters and setters
}

Step 3: Use the Spring Data JPA to connect to the MySQL database and retrieve the data you want to transfer

@Autowired
private UserRepository userRepository;

List<User> users = userRepository.findAll();

Step 4: Use the Spring Data MongoDB to connect to the MongoDB database and insert the retrieved data

@Autowired
private MongoTemplate mongoTemplate;

List<MongoUser> mongoUsers = convertToMongoUsers(users);
mongoTemplate.insertAll(mongoUsers);

Step 5: Use a service class to handle the data transfer between databases

@Service
public class DataTransferService {
   @Autowired
   private UserRepository userRepository;

   @Autowired
   private MongoTemplate mongoTemplate;

   public void transferData() {
      List<User> users = userRepository.findAll();
      List<MongoUser> mongoUsers = convertToMongoUsers(users);
      mongoTemplate.insertAll(mongoUsers);
   }

   private List<MongoUser> convertToMongoUsers(List<User> users) {
      List<MongoUser> mongoUsers = new ArrayList<>();
      for (User user : users) {
         MongoUser mongoUser = new MongoUser();
         mongoUser.setId(String.valueOf(user.getId()));
         mongoUser.setName(user.getName());
         mongoUser.setEmail(user.getEmail());
         mongoUsers.add(mongoUser);
      }
      return mongoUsers;
   }
}

Step 6: Implement a controller class to handle the HTTP requests for the data transfer

@RestController
@RequestMapping("/transfer")
public class DataTransferController {
   @Autowired
   private DataTransferService dataTransferService;

   @GetMapping
   public ResponseEntity<String> transferData() {
      dataTransferService.transferData();
      return new ResponseEntity<>("Data transfer successful!", HttpStatus.OK);
   }
}

Step 7: Test the data transfer by running the Spring Boot application

Send a GET request to http://localhost:8080/transfer to trigger the data transfer from MySQL to MongoDB. You should see a response of "Data transfer successful!" if the transfer was successful.

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Asked: 2023-06-05 10:59:53 +0000

Seen: 17 times

Last updated: Jun 05 '23