Enterprise Java

Spring Data with JPA and @NamedQueries

If you use Spring Data and @NamedQuery annotations at your JPA entity you can easily use them in a more convenient way using the spring data repository.

On a previous blog we created a spring data project using spring boot and docker. We will use the pretty same project and enhance our repository’s functionality.

We will implement a named query that will fetch employees only if their Last Name has as many characters as the ones specified.

package com.gkatzioura.springdata.jpa.persistence.entity;

import javax.persistence.*;

 * Created by gkatzioura on 6/2/16.
@Table(name = "employee", schema="spring_data_jpa_example")
@NamedQuery(name = "Employee.fetchByLastNameLength",
        query = "SELECT e FROM Employee e WHERE CHAR_LENGTH(e.lastname) =:length "
public class Employee {

    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private Long id;

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

    @Column(name = "lastname")
    private String lastname;

    @Column(name = "email")
    private String email;

    @Column(name = "age")
    private Integer age;

    @Column(name = "salary")
    private Integer salary;

    public Long getId() {
        return id;

    public void setId(Long 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;

    public String getEmail() {
        return email;

    public void setEmail(String email) {
        this.email = email;

    public Integer getAge() {
        return age;

    public void setAge(Integer age) {
        this.age = age;

    public Integer getSalary() {
        return salary;

    public void setSalary(Integer salary) {
        this.salary = salary;

Pay extra attention to the query name and the convention we follow @{EntityName}.{queryName}.
Then we will add the method to our spring data repository.

package com.gkatzioura.springdata.jpa.persistence.repository;

import com.gkatzioura.springdata.jpa.persistence.entity.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

 * Created by gkatzioura on 6/2/16.
public interface EmployeeRepository extends JpaRepository<Employee,Long>, EmployeeRepositoryCustom {

    List<Employee> fetchByLastNameLength(@Param("length") Long length);

And last but not least add some functionality to our controller.

package com.gkatzioura.springdata.jpa.controller;

import com.gkatzioura.springdata.jpa.persistence.entity.Employee;
import com.gkatzioura.springdata.jpa.persistence.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

 * Created by gkatzioura on 6/2/16.
public class TestController {

    private EmployeeRepository employeeRepository;

    public List<Employee> getTest() {

        return employeeRepository.findAll();

    public List<Employee> getFiltered(String firstName,@RequestParam(defaultValue = "0") Double bonusAmount) {

        return employeeRepository.getFirstNamesLikeAndBonusBigger(firstName,bonusAmount);

    public List<Employee> fetchByLength(Long length) {
        return employeeRepository.fetchByLastNameLength(length);


You can find the source code on github.

Reference: Spring Data with JPA and @NamedQueries from our JCG partner Emmanouil Gkatziouras at the gkatzioura blog.

Emmanouil Gkatziouras

He is a versatile software engineer with experience in a wide variety of applications/services.He is enthusiastic about new projects, embracing new technologies, and getting to know people in the field of software.
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