JPA JPQL Basic Operations

JPQL allows us to create both static as well as dynamic queries. Now, we will perform some basic JPQL operations using both type of queries on the below table.

JPQL Dynamic Query Example

In this example, we will fetch single column from database by using createQuery() method .

StudentEntity.java

package com.javatpoint.jpa;
import javax.persistence.*;

@Entity
@Table(name="student")
public class StudentEntity {

	@Id
	private int s_id;
	private String s_name;
	private int s_age;
	
	public StudentEntity(int s_id, String s_name, int s_age) {
		super();
		this.s_id = s_id;
		this.s_name = s_name;
		this.s_age = s_age;
	}

	public StudentEntity() {
		super();
	}

	public int getS_id() {
		return s_id;
	}

	public void setS_id(int s_id) {
		this.s_id = s_id;
	}

	public String getS_name() {
		return s_name;
	}

	public void setS_name(String s_name) {
		this.s_name = s_name;
	}

	public int getS_age() {
		return s_age;
	}

	public void setS_age(int s_age) {
		this.s_age = s_age;
	}
	
}

Persistence.xml

<persistence>
<persistence-unit name="Student_details">
   
      <class>com.javatpoint.jpa.StudentEntity</class>

      <properties>
         <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
         <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/studentdata"/>
         <property name="javax.persistence.jdbc.user" value="root"/>
         <property name="javax.persistence.jdbc.password" value=""/>
         <property name="eclipselink.logging.level" value="SEVERE"/>
         <property name="eclipselink.ddl-generation" value="create-or-extend-tables"/>
      </properties>
      
   </persistence-unit>
</persistence>

FetchColumn.java

package com.javatpoint.jpa.jpql;
import javax.persistence.*;
import java.util.*;
public class FetchColumn {
	
	 public static void main( String args[]) {
		   
	      EntityManagerFactory emf = Persistence.createEntityManagerFactory( "Student_details" );
	      EntityManager em = emf.createEntityManager();
	      em.getTransaction().begin( );
             	  
	      Query query = em.createQuery("Select s.s_name from StudentEntity s");
	      @SuppressWarnings("unchecked")
		List<String> list =query.getResultList();
	      System.out.println("Student Name :");
	      for(String s:list) {
	    	  
	         System.out.println(s);
	    
	         
	      }
	      
	  
	      em.close();
	      emf.close();  
	 }
	

}

Output:

JPQL Static Query Example

In this example, we will fetch single column from database by using createNamedQuery() method .

StudentEntity.java

package com.javatpoint.jpa;
	import javax.persistence.*;

	@Entity
	@Table(name="student")
	@NamedQuery(name = "find name" , query = "Select s from StudentEntity s")
	public class StudentEntity {

		@Id
		private int s_id;
		private String s_name;
		private int s_age;
		
		public StudentEntity(int s_id, String s_name, int s_age) {
			super();
			this.s_id = s_id;
			this.s_name = s_name;
			this.s_age = s_age;
		}

		public StudentEntity() {
			super();
		}

		public int getS_id() {
			return s_id;
		}

		public void setS_id(int s_id) {
			this.s_id = s_id;
		}

		public String getS_name() {
			return s_name;
		}

		public void setS_name(String s_name) {
			this.s_name = s_name;
		}

		public int getS_age() {
			return s_age;
		}

		public void setS_age(int s_age) {
			this.s_age = s_age;
		}
		
	}

Persistence.xml

<persistence>
<persistence-unit name="Student_details">
   
      <class>com.javatpoint.jpa.StudentEntity</class>

      <properties>
         <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
         <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/studentdata"/>
         <property name="javax.persistence.jdbc.user" value="root"/>
         <property name="javax.persistence.jdbc.password" value=""/>
         <property name="eclipselink.logging.level" value="SEVERE"/>
         <property name="eclipselink.ddl-generation" value="create-or-extend-tables"/>
      </properties>
      
   </persistence-unit>
</persistence>

FetchColumn.java

package com.javatpoint.jpa.jpql;
import javax.persistence.*;

import com.javatpoint.jpa.StudentEntity;

import java.util.*;
public class FetchColumn {
	
	 public static void main( String args[]) {
		   
	      EntityManagerFactory emf = Persistence.createEntityManagerFactory( "Student_details" );
	      EntityManager em = emf.createEntityManager();
	      em.getTransaction().begin( );
             	  
	      Query query = em.createNamedQuery("find name");
	      @SuppressWarnings("unchecked")
		List<StudentEntity> list =query.getResultList();
	      System.out.println("Student Name :");
	      for(StudentEntity s:list) {
	    	  
	         System.out.println(s.getS_name());
	    
	         
	      }
	      
	  
	      em.close();
	      emf.close();  
	 }
	

}

Next TopicJPA JPQL Bulk Data Operations

← prev next →

For Videos Join Our Youtube Channel: Join Now

Feedback

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Splunk

SPSS

Swagger

Transact-SQL

Tumblr

ReactJS

Regex

Reinforcement Learning

R Programming

RxJS

React Native

Python Design Patterns

Python Pillow

Python Turtle

Keras

Preparation

Aptitude

Reasoning

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

AWS

Selenium

Cloud Computing

Hadoop

ReactJS

Data Science

Angular 7

Blockchain

Git

Machine Learning

DevOps

B.Tech / MCA

DBMS

Data Structures

DAA

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

Automata

C Programming

C++

Java

.Net

Python

Programs

Control System

Data Mining

Data Warehouse

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected]
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}