ID Generation Type: SEQUENCE : Generated ID « JPA

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Java Tutorial » JPA » Generated ID

22. 18. 5. ID Generation Type: SEQUENCE

File: Main.java


import java.sql.Timestamp;

import java.util.List;

import java.util.UUID;



import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;

import javax.persistence.Query;



public class Main {

  static EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");

  static EntityManager em = emf.createEntityManager();



  public static void main(String[] a) throws Exception {

    em.getTransaction().begin();

    

    

    Student student = new Student();



    student.setName("Joe");

  



    

    em.persist(student);

    em.flush();

    em.getTransaction().commit();



    

    Query query = em.createQuery("SELECT e FROM Student e");

    List<Student> list = (List<Student>) query.getResultList();

    System.out.println(list);

    

    

    em.close();

    emf.close();

    

    Helper.checkData();

  }

}

File: Student.java


import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;



@Entity

public class Student {

  @Id

  @GeneratedValue(strategy=GenerationType.SEQUENCE)

  private int id;



  transient private String name;





  



  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 toString() {

    return "\n\nID:" + id + "\nName:" + name + "\n\n";

  }

}

File: Helper.java


import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.ResultSetMetaData;

import java.sql.Statement;



public class Helper {

  public static void checkData() throws Exception {

    Class.forName("org.hsqldb.jdbcDriver");

    Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");

    Statement st = conn.createStatement();



    ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });

    while (mrs.next()) {

      String tableName = mrs.getString(3);

      System.out.println("\n\n\n\nTable Name: "+ tableName);



      ResultSet rs = st.executeQuery("select * from " + tableName);

      ResultSetMetaData metadata = rs.getMetaData();

      while (rs.next()) {

        System.out.println(" Row:");

        for (int i = 0; i < metadata.getColumnCount(); i++) {

          System.out.println("    Column Name: "+ metadata.getColumnLabel(i + 1)+ ",  ");

          System.out.println("    Column Type: "+ metadata.getColumnTypeName(i + 1)+ ":  ");

          Object value = rs.getObject(i + 1);

          System.out.println("    Column Value: "+value+"\n");

        }

      }

    }

  }

}

File: persistence.xml


<persistence xmlns="http://java.sun.com/xml/ns/persistence"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0">

  <persistence-unit name="JPAService" transaction-type="RESOURCE_LOCAL">

    <properties>

      <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>

      <property name="hibernate.hbm2ddl.auto" value="update"/>

      <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>

      <property name="hibernate.connection.username" value="sa"/>

      <property name="hibernate.connection.password" value=""/>

      <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>

    </properties>

  </persistence-unit>

</persistence>

Download: JPA-IDGenerationTypeSEQUENCE.zip( 5,287 k)

22. 18. Generated ID
	22. 18. 1.	JPA Create Sequence Table For You
	22. 18. 2.	Use Sequence Generator
	22. 18. 3.	Sequence Generator Name Init Value And Size
	22. 18. 4.	ID Generation Type: TABLE
	22. 18. 5.	ID Generation Type: SEQUENCE
	22. 18. 6.	ID Generation Type: IDENTITY
	22. 18. 7.	ID Generation Type: AUTO
	22. 18. 8.	Generate ID From a Table
	22. 18. 9.	Generated Value Based On Sequence Generator
	22. 18. 10.	Create Your Own Table For Table Generator
	22. 18. 11.	Create Table From Table Generator

ID Generation Type: SEQUENCE : Generated ID « JPA « Java Tutorial