How to insert data into a MySQL table using Spring Data JPA

Step 1: Set up Your Project
Step 2: Create database using MySql
Step 3: Configure Your Database
Step 4: Create an Entity Class
Step 5: Create a Repository Interface name EmployeeRepository.java
Step 6: Create a Insert Data in (Main Method) Class DBOperationRunner.java
Step 7: Create a Main Application Class SpringJdbcMysqlApplication.java
Step 8: Run Your Application

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Create a new Spring Boot project using your preferred development environment (e.g., Eclipse or your IDE).

Step 1: Set up Your Project

Create a Spring Project using Eclipse

Select Spring Data JPM and MySQL Driver

Step 2: Create database using MySQL

Download MySQL

Create Database cwp
use cwp;
select * from employee;

Step 3: Configure Your Database

In the SpringJDBCMysql\src\main\resources\application.properties file, configure your MySQL database connection properties:

path = SpringJDBCMysql\src\main\resources\application.properties

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/cwp
spring.datasource.username=root
spring.datasource.password=admin
spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

Step 4: Create an Entity Class

Create an entity class representing the data you want to insert into the database. For example, let’s say you have a “Employee.java” entity:

path = SpringJDBCMysql\src\main\java\in\p4n\Employee.java

package in.p4n;

import jakarta.persistence.Entity;
import jakarta.persistence.Id;

@Entity
public class Employee {

   @Id
   private Integer empId;
   private String empName;
   private Double empSal;
   private String empDept;

   public Employee() {

   }

   public Employee(Integer empId, String empName, Double empSal, String empDept) {
      super();
      this.empId = empId;
      this.empName = empName;
      this.empSal = empSal;
      this.empDept = empDept;
   }

   public Integer getEmpId() {
      return empId;
   }
   public void setEmpId(Integer empId) {
      this.empId = empId;
   }
   public String getEmpName() {
      return empName;
   }
   public void setEmpName(String empName) {
      this.empName = empName;
   }
   public Double getEmpSal() {
      return empSal;
   }
   public void setEmpSal(Double empSal) {
      this.empSal = empSal;
   }
   public String getEmpDept() {
      return empDept;
   }
   public void setEmpDept(String empDept) {
      this.empDept = empDept;
   }

}

Step 5: Create a Repository Interface name EmployeeRepository.java

Create a repository interface for your entity by extending JpaRepository<Employee, Integer>:

path = SpringJDBCMysql\src\main\java\in\p4n\EmployeeRepository.java

package in.p4n;

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

@Repository
public interface EmployeeRepository extends JpaRepository<Employee, Integer> {

}

Step 6: Create a Insert Data in (Main Method) Class DBOperationRunner.java

Create a service class that uses the repository to insert data:

path = SpringJDBCMysql\src\main\java\in\p4n\DBOperationRunner.java

package in.p4n;

import java.util.Arrays;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class DBOperationRunner implements CommandLineRunner {

     @Autowired
     EmployeeRepository eRepo;

     @Override
     public void run(String... args) throws Exception {

           eRepo.saveAll(Arrays.asList(

                      new Employee(1001,"James",2599.5,"HR"),
                      new Employee(1002,"Elizabeth",2999.0,"Admin"),
                      new Employee(1003,"Robert",2699.5,"Testing"),
                      new Employee(1004,"Victoria",3000.5,"Development"),
                      new Employee(1005,"David",2650.5,"QA"),
                      new Employee(1006,"Isabel",2590.0,"Support"),
                      new Employee(1007,"Michael",3599.75,"Development"),
                      new Employee(1008,"Maria",2499.0,"Finance"),
                      new Employee(1009,"Thomas",2799.25,"HR"),
                      new Employee(1010,"Maria",2899.5,"Development"),
                new Employee(1011,"Omji",28993.5,"IOS Development"))

            ); 

          System.out.println("----------All Data saved into Database----------------------");
          }

}

Step 7: Create a Main Application Class SpringJdbcMysqlApplication.java

Create a main application class with a main method to run your Spring Boot application:

Path = SpringJDBCMysql\src\main\java\in\p4n\SpringJdbcMysqlApplication.java

package in.p4n;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringJdbcMysqlApplication {

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

}

Step 8: Run Your Application

Start your Spring Boot application.

When you run your application, it will insert the user data into the “employee” table in the MySQL database.

Output like this

Output Like this …