Java Calendar Mapped To Date : Calendar Date « JPA

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Java Tutorial » JPA » Calendar Date

22. 23. 8. Java Calendar Mapped To Date

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: Main.java


import java.util.Calendar;

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.setId(UUID.randomUUID().toString() );

    student.setName("Joe");

    student.setDob(Calendar.getInstance());



    

    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.Id;

import javax.persistence.Temporal;

import javax.persistence.TemporalType;



@Entity

public class Student {

  @Id

  private String id;



  private String name;

  @Temporal(TemporalType.DATE)

  private java.util.Calendar dob;



  



  public String getId() {

    return id;

  }



  public void setId(String id) {

    this.id = id;

  }



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }





  public java.util.Calendar getDob() {

    return dob;

  }



  public void setDob(java.util.Calendar dob) {

    this.dob = dob;

  }



  public String toString() {

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

  }

}

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-JavaCalendarMappedToDate.zip( 5,288 k)

22. 23. Calendar Date
	22. 23. 1.	Mark Java Calendar With Temporal Type Date
	22. 23. 2.	Temporal Type TIMESTAMP
	22. 23. 3.	Temporal Type DATE
	22. 23. 4.	Map Java Date To Timestamp
	22. 23. 5.	Map Java Date To Time
	22. 23. 6.	Map Java Date To Date
	22. 23. 7.	Map Java Calendar To Timestamp
	22. 23. 8.	Java Calendar Mapped To Date
	22. 23. 9.	Date Mapped To Timestamp By Default

Java Calendar Mapped To Date : Calendar Date « JPA « Java Tutorial