Spring Data JPA Is and Equals Example

In this tutorial, we will see Spring Data JPA Is and Equals Example using Spring Boot and oracle. We will see what query prepared in both cases with example.

Let’s see how to define the Query method(Query creation from method names) using Spring Data Is and Equals Keywords.

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.

 

Query method using Is keyword.

public List<Student> findByNameIs(String name);

Generated Query.

Hibernate:
select
student0_.id as id1_0_,
student0_.name as name2_0_,
student0_.roll_number as roll_number3_0_,
student0_.university as university4_0_
from
student student0_
where
student0_.name=?

 

Let’s see Spring Data JPA Is and Equals Example Query Methods.

Query method using Equals keyword.

public List<Student> findByNameEquals(String name);

Generated Query.

Hibernate:
select
student0_.id as id1_0_,
student0_.name as name2_0_,
student0_.roll_number as roll_number3_0_,
student0_.university as university4_0_
from
student student0_
where
student0_.name=?

 

Another Spring Data JPA Query method.

public List<Student> findByName(String name);

Hibernate:
select
student0_.id as id1_0_,
student0_.name as name2_0_,
student0_.roll_number as roll_number3_0_,
student0_.university as university4_0_
from
student student0_
where
student0_.name=?

All Below defined methods will have the same generated query.

Repository Example.

package com.javatute.repository;

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

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

import com.javatute.entity.Student;

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

	public List<Student> findByName(String name);
	
	public List<Student> findByNameIs(String name);
	
	public List<Student> findByNameEquals(String name);

}

 

Spring Data JPA Is and Equals 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 – springdataisequals, ArtifactId – springdataisequals and name – springdataisequals) 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>springdataisequals</groupId>
	<artifactId>springdataisequals</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springdataisequals</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 Is and Equals Example 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;

@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;

	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 = "/nameandrollNumber/{name}/{rollNumber}", method = RequestMethod.GET)
	@ResponseBody
	public List<Student> findByNameContainingIgnoreCase(@PathVariable String name, @PathVariable String rollNumber) {

		List<Student> studentResponse = (List<Student>) studentService.findByNameAndRollNumber(name, rollNumber);
		return studentResponse;
	}

	@RequestMapping(value = "/nameorrollNumber/{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;
	}

	@RequestMapping(value = "/nameoandrollNumberoruniversity/{name}/{rollNumber}/{university}", method = RequestMethod.GET)
	@ResponseBody
	public List<Student> findByNameAndRollNumberOrUniversity(@PathVariable String name, @PathVariable String rollNumber,
			@PathVariable String university) {

		List<Student> studentResponse = (List<Student>) studentService.findByNameAndRollNumberOrUniversity(name,
				rollNumber, university);
		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.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.javatute.entity.Student;

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

	public List<Student> findByNameAndRollNumber(String name, String rollNumber);
	
	public List<Student> findByNameOrRollNumber(String name, String rollNumber);
	
	public List<Student> findByNameAndRollNumberOrUniversity(String name, String rollNumber, String university);

}

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);

	public List<Student> findByNameAndRollNumber(String name, String rollNumber);
	
	public List<Student> findByNameOrRollNumber(String name, String rollNumber);
	
	public List<Student> findByNameAndRollNumberOrUniversity(String name, String rollNumber, String university);

}

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
	public List<Student> findByNameAndRollNumber(String name, String rollNumber) {
		List<Student> response = (List<Student>) studentRepository.findByNameAndRollNumber(name, rollNumber);
		return response;
	}

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

	@Transactional
	public List<Student> findByNameAndRollNumberOrUniversity(String name, String rollNumber, String university) {
		List<Student> response = (List<Student>) studentRepository.findByNameAndRollNumberOrUniversity(name, rollNumber,
				university);
		return response;
	}
}

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/findbynameis/john

 

http://localhost:9091/student/findbynameequals/john

 

http://localhost:9091/student/findbyname/john

 

 

That’s all about Spring Data JPA Is and Equals Example Using Spring Boot and oracle.

 

You may like.

 

• Spring Data JPA greater than Example
• Spring Data JPA less than Example
• Spring Data JPA IsNull Example Using Spring Boot
• Spring Data findById() Vs getOne()
• Spring Data JPA CrudRepository findById()
• Spring Data JPA JpaRepository getOne()
• Spring Data CrudRepository saveAll() and findAll().
• Spring Data CrudRepository existsById()
• Spring Data JPA delete() vs deleteInBatch()
• Spring Data JPA deleteAll() Vs deleteAllInBatch()
• Spring Data JPA JpaRepository deleteAllInBatch()
• Spring Data JPA deleteInBatch() Example
• Spring Data JPA JpaRepository saveAndFlush() Example
• Spring Data JPA CrudRepository count() Example
• Spring Data JPA CrudRepository delete() and deleteAll()
• Spring Data JPA CrudRepository deleteById() Example
• CrudRepository findAllById() Example Using Spring Boot
• Spring Data CrudRepository save() Method.
• Sorting in Spring Data JPA using Spring Boot.
• Spring Data JPA example using spring boot.
• Spring Data JPA and its benefit.

Other Spring Data JPA and Hibernate tutorials.

• @Version Annotation Example In Hibernate.
• Hibernate Validator Constraints Example Using Spring Boot.
• @Temporal Annotation Example In Hibernate/Jpa Using Spring Boot.
• Hibernate Table Per Concrete Class Spring Boot.
• Hibernate Table Per Subclass Inheritance Spring Boot.
• Hibernate Single Table Inheritance using Spring Boot.
• One To One Mapping Annotation Example in Hibernate/JPA using Spring Boot and Oracle.
• One To One Bidirectional Mapping Example In Hibernate/JPA Using Spring Boot and Oracle.
• One To Many Mapping Annotation Example In Hibernate/JPA Using Spring Boot And Oracle.
• Many To One Unidirectional Mapping In Hibernate/JPA Annotation Example Using Spring Boot and Oracle.
• One To Many Bidirectional Mapping In Hibernate/JPA Annotation Example Using Spring Boot and Oracle.
• Many To Many Mapping Annotation Example In Hibernate/JPA Using Spring Boot And

 

Spring Data JPA Docs.