Spring Data JPA @NamedQuery

In this tutorial, we will see Spring Data JPA @NamedQuery annotation Example using Spring Boot and oracle. Also, we will see how to write multiple @NamedQuery using @NamedQueries annotation.

@NamedQuery and @NamedQueries annotations used with entity class. Using @NamedQuery annotation we can define a query. Inside @NamedQueries we can define multiple @NamedQuery.

 

Consider we have an entity called Student.java as below.

package com.javatute.entity;

@Entity
public class Student {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

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

	@Column(name = "roll_number")
	private String rollNumber;

	@Column(name = "university")
	String university;
	

}

 

and we have some record in the database as below.

 

Using @NamedQuery.

package com.javatute.entity;


@Entity
@NamedQuery(name = "Student.findByName", query = "select s from Student s where s.name = ?1")
public class Student {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

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

	@Column(name = "roll_number")
	private String rollNumber;

	@Column(name = "university")
	String university;
}

Using @NamedQueries.

package com.javatute.entity;

@Entity
@NamedQueries({ @NamedQuery(name = "Student.findByName1", query = "select s from Student s where s.name = ?1"),
		@NamedQuery(name = "Student.findByNameAndRollNumber", query = "select s from Student s where s.name = ?1 and s.rollNumber = ?2"),
		@NamedQuery(name = "Student.findByNameOrRollNumber", query = "select s from Student s where s.name = ?1 or s.rollNumber = ?2") })
public class Student {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

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

	@Column(name = "roll_number")
	private String rollNumber;

	@Column(name = "university")
	String university;

}

Let’s see sample repository Spring Data JPA @NamedQuery.

Sample Repository Example.

package com.javatute.repository;

import java.io.Serializable;
import java.util.List;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import com.javatute.entity.Student;

@Repository
public interface StudentRepository extends CrudRepository<Student, Serializable> {

	List<Student> findByName(String name);

	List<Student> findByNameAndRollNumber(String name, String rollNumber);

	List<Student> findByNameOrRollNumber(String name, String rollNumber);

}

Till now We have seen Spring Data JPA @NamedQuery and @NamedQueries annotations. Let’s see a complete example from scratch.

Spring Data JPA @NamedQuery and  @NamedQueries Example using  Spring Boot and Oracle.

Open eclipse and create maven project, Don’t forget to check ‘Create a simple project (skip)’ click on next.  Fill all details(GroupId – springdatanamedquery, ArtifactId – springdatanamedquery and name – springdatanamedquery) and click on finish. Keep packaging as the jar.

Modify pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>springdatanamedquery</groupId>
	<artifactId>springdatanamedquery</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springdatanamedquery</name>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.2.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>

		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>

		<dependency>
			<groupId>com.oracle</groupId>
			<artifactId>ojdbc6</artifactId>
			<version>11.2.0.3</version>
		</dependency>

	</dependencies>
	<build>
		<finalName>${project.artifactId}</finalName>
		<plugins>

			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.1</version>
				<configuration>
					<fork>true</fork>
					<executable>C:\Program Files\Java\jdk1.8.0_131\bin\javac.exe</executable>
				</configuration>
			</plugin>


		</plugins>
	</build>
</project>

Note – In pom.xml we have defined javac.exe path in configuration tag. You need to change accordingly i.e where you have installed JDK.

If you see any error for oracle dependency then follow these steps.

Directory structure –

 

Let’s see the entity for Spring Data JPA @NamedQuery using Spring Boot.

Student.java

package com.javatute.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;

@Entity
@NamedQueries({ @NamedQuery(name = "Student.findByName1", query = "select s from Student s where s.name = ?1"),
		@NamedQuery(name = "Student.findByNameAndRollNumber", query = "select s from Student s where s.name = ?1 and s.rollNumber = ?2"),
		@NamedQuery(name = "Student.findByNameOrRollNumber", query = "select s from Student s where s.name = ?1 or s.rollNumber = ?2") })
public class Student {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

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

	@Column(name = "roll_number")
	private String rollNumber;

	@Column(name = "university")
	String university;

	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getRollNumber() {
		return rollNumber;
	}

	public void setRollNumber(String rollNumber) {
		this.rollNumber = rollNumber;
	}

	public String getUniversity() {
		return university;
	}

	public void setUniversity(String university) {
		this.university = university;
	}

}

StudentController.java

package com.javatute.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.javatute.entity.Student;
import com.javatute.service.StudentService;

@RestController
@RequestMapping(value = "/student")
public class StudentController {

	@Autowired
	private StudentService studentService;

	@RequestMapping(value = "/saveall", method = RequestMethod.POST)
	@ResponseBody
	public List<Student> saveAllStudents(@RequestBody List<Student> studentList) {
		List<Student> studentResponse = (List<Student>) studentService.saveAllStudent(studentList);
		return studentResponse;
	}

	@RequestMapping(value = "/findByName/{name}", method = RequestMethod.GET)
	@ResponseBody
	public List<Student> findByName(@PathVariable String name) {
		List<Student> studentResponse = (List<Student>) studentService.findByName(name);
		return studentResponse;
	}

	@RequestMapping(value = "/findByNameAndRollNumber/{name}/{rollNumber}", method = RequestMethod.GET)
	@ResponseBody
	public List<Student> findByNameAndRollNumber(@PathVariable String name, @PathVariable String rollNumber) {
		List<Student> studentResponse = (List<Student>) studentService.findByNameAndRollNumber(name, rollNumber);
		return studentResponse;
	}

	@RequestMapping(value = "/findByNameOrRollNumber/{name}/{rollNumber}", method = RequestMethod.GET)
	@ResponseBody
	public List<Student> findByNameOrRollNumber(@PathVariable String name, @PathVariable String rollNumber) {
		List<Student> studentResponse = (List<Student>) studentService.findByNameOrRollNumber(name, rollNumber);
		return studentResponse;
	}

}

 

Note – See more details about @Controller and RestController here.

StudentRepository.java – interface

package com.javatute.repository;

import java.io.Serializable;
import java.util.List;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import com.javatute.entity.Student;

@Repository
public interface StudentRepository extends CrudRepository<Student, Serializable> {

	List<Student> findByName(String name);

	List<Student> findByNameAndRollNumber(String name, String rollNumber);

	List<Student> findByNameOrRollNumber(String name, String rollNumber);

}

StudentService.java – interface

package com.javatute.service;

import java.util.List;

import org.springframework.stereotype.Component;

import com.javatute.entity.Student;

@Component
public interface StudentService {
	public List<Student> saveAllStudent(List<Student> studentList);

	List<Student> findByName(String name);

	List<Student> findByNameAndRollNumber(String name, String rollNumber);

	List<Student> findByNameOrRollNumber(String name, String rollNumber);
}

Note – See here more about @Component, @Controller, @Service and @Repository annotations here.

StudentServiceImpl.java

package com.javatute.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.javatute.entity.Student;
import com.javatute.repository.StudentRepository;
import com.javatute.service.StudentService;

@Service("studentServiceImpl")
public class StudentServiceImpl implements StudentService {

	@Autowired
	private StudentRepository studentRepository;

	@Transactional
	public List<Student> saveAllStudent(List<Student> studentList) {
		List<Student> response = (List<Student>) studentRepository.saveAll(studentList);
		return response;
	}

	@Transactional(readOnly = true)
	public List<Student> findByName(String name) {
		List<Student> studentResponse = studentRepository.findByName(name);
		return studentResponse;
	}

	@Transactional(readOnly = true)
	public List<Student> findByNameAndRollNumber(String name, String rollNumber) {
		List<Student> studentResponse = studentRepository.findByNameAndRollNumber(name, rollNumber);
		return studentResponse;
	}
	
	@Transactional(readOnly = true)
	public List<Student> findByNameOrRollNumber(String name, String rollNumber) {
		List<Student> studentResponse = studentRepository.findByNameOrRollNumber(name, rollNumber);
		return studentResponse;
	}

}

SpringMain.java

package com.javatute.main;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages = "com.*")
@EntityScan("com.javatute.entity")
public class SpringMain {
	public static void main(String[] args) {

		SpringApplication.run(SpringMain.class, args);
	}

}

Note – See more details about @ComponentScan here.

JpaConfig.java

package com.javatute.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@Configuration
@EnableJpaRepositories(basePackages = "com.javatute.repository")
public class JpaConfig {

}

Note – See more details about @Configuration annotations here.

application.properties

# Connection url for the database
spring.datasource.url=jdbc:oracle:thin:@localhost:1521:XE
spring.datasource.username=SYSTEM
spring.datasource.password=oracle2
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
# Show or not log for each sql query
spring.jpa.show-sql = true
spring.jpa.properties.hibernate.format_sql=true 
 
spring.jpa.hibernate.ddl-auto =create
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.Oracle10gDialect
 
server.port = 9091

#show sql values
logging.level.org.hibernate.type.descriptor.sql=trace

#hibernate.show_sql = true
#spring.jpa.hibernate.logging.level.sql =FINE
#show sql statement
#logging.level.org.hibernate.SQL=debug

Let’s run the SpringMain class(run as java application).

Perform saveall operation first using below REST API.

http://localhost:9091/student/saveall

[
    {
        "name": "john",
        "rollNumber": "120",
        "university":"rgtu"
    },
    {
        "name": "mark",
        "rollNumber": "121",
        "university":"rgtu"
    },
    {
        "name": "aric",
        "rollNumber": "123",
        "university":"rgtu"
    },
    {
        "name": "hira",
        "rollNumber": "124",
        "university":"rgtu"
    }
]

 

Response Data.

[
    {
        "id": 1,
        "name": "john",
        "rollNumber": "120",
        "university": "rgtu"
    },
    {
        "id": 2,
        "name": "mark",
        "rollNumber": "121",
        "university": "rgtu"
    },
    {
        "id": 3,
        "name": "aric",
        "rollNumber": "123",
        "university": "rgtu"
    },
    {
        "id": 4,
        "name": "hira",
        "rollNumber": "124",
        "university": "rgtu"
    }
]

 

http://localhost:9091/student/findByName/john

 

http://localhost:9091/student/findByNameAndRollNumber/john/120

 

http://localhost:9091/student/findByNameOrRollNumber/john/121

 

 

That’s all about Spring Data JPA @NamedQuery and @NamedQueries annotation Example Using Spring Boot and Oracle.

 

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• Many To Many Mapping Annotation Example In Hibernate/JPA Using Spring Boot And

 

Spring Data JPA Docs.

 

Summary –  We have seen about Spring Data JPA @NamedQuery and @NamedQueries.