Spring Boot Day 8

Today on the 8th day of spring boot I learned about the Crud operation using JPA and Spring Boot.

C - Create

R - Read

U - Update

D - Delete

To perform CRUD (Create, Read, Update, Delete) operations using JPA (Java Persistence API) and Spring Boot, you can follow these steps:

1. Set up your Spring Boot project with JPA dependencies and configurations. Make sure you have the necessary dependencies in your pom.xml or build.gradle file. You'll need at least spring-boot-starter-data-jpa a database driver dependency (e.g., mysql-connector-java for MySQL).

2. Create an entity class representing your data model. An entity class is annotated with @Entity and represents a table in the database. Define your class attributes and annotate them with appropriate JPA annotations such as @Id, @Column, etc.

3. CRUD (Create, Read, Update, Delete) operations in Spring Boot refer to the common operations performed on a persistent data store, such as a database. Spring Boot provides powerful features and abstractions to simplify and streamline the implementation of CRUD operations. Here's a breakdown of each CRUD operation in the context of Spring Boot:

   1. Create (C): Creating a new record involves persisting data into the data store. In Spring Boot, you typically receive data through an HTTP request, such as a form submission or API call. You can handle the incoming data in a controller method, validate it if necessary, and then use a service class to save the data into the database using a repository or a data access object (DAO). The data is typically sent as a JSON or form-encoded payload. The @PostMapping annotation is commonly used in the controller to handle create operations.

   2. Read (R): Reading data involves retrieving existing records from the data store. In Spring Boot, you can implement read operations using a controller method annotated with @GetMapping or @RequestMapping. The method retrieves data from the database using a repository or DAO and returns the data in an appropriate format, such as JSON, XML, or HTML. You can retrieve all records or filter them based on specific criteria.

   3. Update (U): Updating a record involves modifying existing data in the data store. In Spring Boot, you can handle update operations using a controller method annotated with @PutMapping or @PatchMapping. The method receives the updated data as a JSON payload, validates it if necessary, and uses a service class to update the corresponding record in the database. You typically identify the record to update using a unique identifier, such as an ID.

   4. Delete (D): Deleting a record involves removing it from the data store. In Spring Boot, you can implement delete operations using a controller method annotated with @DeleteMapping. The method receives the unique identifier of the record to delete and uses a service class to delete the corresponding record from the database. The record can be identified by its ID or any other unique attribute.