Spring boot: jpa: DELETE Query

We can execute queries using @Query annotation. If you are performing UPDATE/DELETE queries, you should annotate that query method with @Transactional and @Modifying annotations.

public interface EmployeeRepository extends JpaRepository<Employee, Integer> {

 @Transactional
 @Modifying
 @Query("UPDATE Employee SET firstName=UPPER(firstName) WHERE id in :ids")
 public int toUpperEmployeeFirstNames(@Param(value = "ids") List<Integer> ids);

 @Transactional
 @Modifying
 @Query("DELETE FROM Employee WHERE id in :ids")
 public int deleteEmployees(@Param(value = "ids") List<Integer> ids);

}

'toUpperEmployeeFirstNames' method convert employee first names to upper case for given employee ids.

'deleteEmployees' method take list of employee ids as input and delete the employees that matches to given ids.

Find the below working application.

Employee.java

package com.sample.app.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "employees")
public class Employee {

 @Id
 @GeneratedValue
 @Column(name = "EMPLOYEE_ID")
 private int id;

 @Column(name = "EMPLOYEE_FIRST_NAME")
 private String firstName;

 @Column(name = "EMPLOYEE_LAST_NAME")
 private String lastName;

 public Employee() {

 }

 public Employee(String firstName, String lastName) {
  this.firstName = firstName;
  this.lastName = lastName;
 }

 public int getId() {
  return id;
 }

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

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 @Override
 public String toString() {
  return "Employee [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + "]";
 }

}

EmployeeRepository.java

package com.sample.app.repository;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.transaction.annotation.Transactional;

import com.sample.app.entity.Employee;

public interface EmployeeRepository extends JpaRepository<Employee, Integer> {

 @Transactional
 @Modifying
 @Query("UPDATE Employee SET firstName=UPPER(firstName) WHERE id in :ids")
 public int toUpperEmployeeFirstNames(@Param(value = "ids") List<Integer> ids);

 @Transactional
 @Modifying
 @Query("DELETE FROM Employee WHERE id in :ids")
 public int deleteEmployees(@Param(value = "ids") List<Integer> ids);

}

App.java

package com.sample.app;

import java.util.Arrays;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import com.sample.app.entity.Employee;
import com.sample.app.repository.EmployeeRepository;

@SpringBootApplication
public class App {

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

 @Bean
 public CommandLineRunner demo(EmployeeRepository empRepo) {
  return (args) -> {

   Employee emp1 = new Employee("Naresh", "Deva");
   Employee emp2 = new Employee("Nani", "Kulkarni");
   Employee emp3 = new Employee("Ram", "Kishore");

   empRepo.saveAll(Arrays.asList(emp1, emp2, emp3));

   empRepo.findAll().forEach(System.out::println);

   int updatedRecords = empRepo.toUpperEmployeeFirstNames(Arrays.asList(1, 2));
   System.out.println("\nTotal records updated : " + updatedRecords + "\n");

   empRepo.findAll().forEach(System.out::println);

   int deletedRecords = empRepo.deleteEmployees(Arrays.asList(2, 3));
   System.out.println("\nTotal records deleted : " + deletedRecords + "\n");

   empRepo.findAll().forEach(System.out::println);
  };
 }

}

application.properties

logging.level.root=WARN
logging.level.org.hibernate=ERROR

## H2 specific properties
spring.h2.console.enabled=true
spring.h2.console.path=/h2

spring.datasource.url=jdbc:h2:file:~/db/myOrg.db;DB_CLOSE_ON_EXIT=FALSE;DB_CLOSE_DELAY=-1;

spring.datasource.username=krishna
spring.datasource.password=password123

spring.datasource.driverClassName=org.h2.Driver

## JPA specific properties
# Creates the schema, destroying previous data.
spring.jpa.hibernate.ddl-auto=create

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

spring.jpa.show-sql=false
spring.jpa.properties.hibernate.format_sql=false

## Database connection pooling properties
# Number of ms to wait before throwing an exception if no connection is available.
spring.datasource.max-wait=10000

# Maximum number of active connections that can be allocated from this pool at the same time.
spring.datasource.tomcat.max-active=10
spring.datasource.tomcat.max-idle=5
spring.datasource.tomcat.min-idle=3

Total project structure looks like below.

Run App.java, you can see below messages in console.

Employee [id=1, firstName=Naresh, lastName=Deva]
Employee [id=2, firstName=Nani, lastName=Kulkarni]
Employee [id=3, firstName=Ram, lastName=Kishore]

Total records updated : 2

Employee [id=1, firstName=NARESH, lastName=Deva]
Employee [id=2, firstName=NANI, lastName=Kulkarni]
Employee [id=3, firstName=Ram, lastName=Kishore]

Total records deleted : 2

Employee [id=1, firstName=NARESH, lastName=Deva]

You can download complete working application from this link.

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