Spring Data JPA – Insert Data in MySQL Table

Spring Data JPA makes it easy to work with databases in Spring Boot by reducing the need for boilerplate code. It provides built-in methods to perform operations like inserting, updating, and deleting records in a MySQL table. In this article, we will see how to insert data into a MySQL database using Spring Boot, Spring Data JPA, and Hibernate with the save() method of JpaRepository.

JPARepositery<>.save() method is used for inserting the values in the MySQL table.

Step By Step Implementation

Step 1: Create a Spring Boot Project

• Go to Spring Initializr.
• Select Spring Boot Version 3.x.
• Add the following dependencies:
  • Spring Web
  • Spring Data JPA
  • MySQL Driver

Click Generate, download the project, and extract it.

Step 2: Configure pom.xml

Ensure your pom.xml includes the latest Spring Boot version and Java 17+.

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.0</version> <!-- Latest Spring Boot version -->
    <relativePath/>
    </parent>
     <properties>
        <java.version>17</java.version>
     </properties>
    <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-web</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-j"va</artifactId>
        <scope>runtime</scope>
    </dependency>
    </dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Extract the zip file. Now open a suitable IDE and then go to File->New->Project from Existing Sources and select pom.xml. Click on import changes on prompt and wait for the project to sync

Note: In the Import Project for Maven window, make sure you choose the same version of JDK which you selected while creating the project.

Step 3: Configure application.properties for Database Configuration

application.properties file:

spring.datasource.url=jdbc:mysql://localhost:3306/user_db

spring.datasource.username=${DB_USERNAME}

spring.datasource.password=${DB_PASSWORD}

spring.jpa.hibernate.ddl-auto=update

spring.jpa.show-sql=true

Project Structure:

Define the Entity and Repository

Step 4: Create User Entity

Use Lombok for cleaner code and JPA annotations for table mapping.

import jakarta.persistence.*;
import lombok.*;

@Entity
@Table(name = "users")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    
    @Column(nullable = false)
    private String name;
}

Step 5: Create UserRepository

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Integer> {
}

Insert Data into MySQL

Step 6: Create Spring Boot Main Class

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootAppApplication implements CommandLineRunner {
    
    @Autowired
    private UserRepository userRepository;

    public static void main(String[] args) {
        SpringApplication.run(SpringBootAppApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        User firstUser = new User();
        firstUser.setName("Aayush");
        
        userRepository.save(firstUser);
    }
}

 
Running the Application

The application will start, and data will be inserted into MySQL.

Output:

Database Output:

Verify the inserted data by running the SQL query:

SELECT * FROM users;

zack_aayush

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Article Tags :

• Advance Java
• Java-Spring-Data
• Java-Spring-Data-JPA