Java/Hibernate/Hibernate Data Type

Date Calendar Type Demo

/////////////////////////////////////////////////////////////////////////
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
    <class  name="BasicAccount" table="account"> 
    <id name="id" type="string" unsaved-value="null">
       <generator class="uuid.hex"/>
    </id>
    
    <property name="name"/>
    <property name="accountnumber"/>
    <property name="setupdate">
        <column name="setup" sql-type="Date"/>
    </property>
    <property name="balance" type="double"/>
    </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
import java.util.*;
public class BasicAccount {
  private String id; 
  private String name;
  private String accountnumber; 
  private Date setupdate; 
  private double balance;
  public BasicAccount() {
  }
  public void setId(String s) {
    id = s;
  }
  public String getId() {
    return id;
  }
  public void setName(String s) {
    name = s;
  }
  public String getName() {
    return name;
  }
  public void setAccountnumber(String s) {
    accountnumber = s;
  }
  public String getAccountnumber() {
    return accountnumber;
  }
  public void setSetupdate(Date d) {
    setupdate = d;
  }
  public Date getSetupdate() {
    return setupdate;
  }
  public void setBalance(double d) {
    balance = d;
  }
  public double getBalance() {
    return balance;
  }
  
}

/////////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:data/tutorial</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <!-- Mapping files -->
        <mapping resource="BasicAccount.hbm.xml"/>
    </session-factory>
</hibernate-configuration>
/////////////////////////////////////////////////////////////////////////

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
    public static final SessionFactory sessionFactory;
    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    public static final ThreadLocal session = new ThreadLocal();
    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            // Store it in the ThreadLocal variable
            session.set(s);
        }
        return s;
    }
    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
    
    static Connection conn; 
    static Statement st;
  public static void setup(String sql) {
    try {
      // Step 1: Load the JDBC driver.
      Class.forName("org.hsqldb.jdbcDriver");
      System.out.println("Driver Loaded.");
      // Step 2: Establish the connection to the database.
      String url = "jdbc:hsqldb:data/tutorial";
      conn = DriverManager.getConnection(url, "sa", "");
      System.out.println("Got Connection.");
      st = conn.createStatement();
      st.executeUpdate(sql);
    } catch (Exception e) {
      System.err.println("Got an exception! ");
      e.printStackTrace();
      System.exit(0);
    }
  }
  public static void checkData(String sql) {
    try {
      HibernateUtil.outputResultSet(st
          .executeQuery(sql));
//      conn.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
    public static void outputResultSet(ResultSet rs) throws Exception{
    ResultSetMetaData metadata = rs.getMetaData();
    int numcols = metadata.getColumnCount();
    String[] labels = new String[numcols]; 
    int[] colwidths = new int[numcols];
    int[] colpos = new int[numcols];
    int linewidth;
      for (int i = 0; i < numcols; i++) {
        labels[i] = metadata.getColumnLabel(i + 1); // get its label
        System.out.print(labels[i]+"  ");
    }
      System.out.println("------------------------");
    while (rs.next()) {
        for (int i = 0; i < numcols; i++) {
        Object value = rs.getObject(i + 1);
        System.out.print(value.toString().trim()+"   ");
      }
    }
    }
}
/////////////////////////////////////////////////////////////////////////

import java.io.Serializable;
import java.util.*;
import java.sql.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.criterion.*;
import org.hibernate.event.*;
import org.hibernate.event.def.*;
public class Main {
   public static void main(String[] args) throws Exception {
      HibernateUtil.setup("create table account (id varchar not null,name varchar,accountnumber varchar,setup Date,balance double);");    

      Session session = HibernateUtil.currentSession();
      BasicAccount account = new BasicAccount();
      account.setName("Joe");
      account.setAccountnumber("39084");
      account.setSetupdate(new java.util.Date());
      account.setBalance(4054.00);
      session.save(account);
      session.flush();
      BasicAccount account2 = (BasicAccount)session.load
            (BasicAccount.class, account.getId());
      System.out.println(account.getId() + " : " + account.getSetupdate());
      System.out.println(account2.getId() +
             " : " + account2.getSetupdate());
      session.close();

      session.close();
      HibernateUtil.checkData("select * from account");
   }
}

/////////////////////////////////////////////////////////////////////////

Float Data Type

/////////////////////////////////////////////////////////////////////////
import java.io.Serializable;
import java.util.*;
import java.sql.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.criterion.*;
import org.hibernate.event.*;
import org.hibernate.event.def.*;
public class Main {
   public static void main(String[] args) throws Exception {
      HibernateUtil.setup("create table books(id int, title VARCHAR, author VARCHAR,isbn VARCHAR not null, pagecount int, copyright int, cost numeric(12,2));");    
      Session session = HibernateUtil.currentSession();
      Book book = new Book();
      book.setTitle("Title");
      book.setIsbn("000000000000000");
      book.setAuthor("name");
      book.setCopyright(9);
      book.setPages(330);
      book.setCost(29.99f);
      session.save(book);
      session.flush();
      session.close();
      HibernateUtil.checkData("select * from books");
   }
}


/////////////////////////////////////////////////////////////////////////

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
    public static final SessionFactory sessionFactory;
    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    public static final ThreadLocal session = new ThreadLocal();
    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            // Store it in the ThreadLocal variable
            session.set(s);
        }
        return s;
    }
    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
    
    static Connection conn; 
    static Statement st;
  public static void setup(String sql) {
    try {
      // Step 1: Load the JDBC driver.
      Class.forName("org.hsqldb.jdbcDriver");
      System.out.println("Driver Loaded.");
      // Step 2: Establish the connection to the database.
      String url = "jdbc:hsqldb:data/tutorial";
      conn = DriverManager.getConnection(url, "sa", "");
      System.out.println("Got Connection.");
      st = conn.createStatement();
      st.executeUpdate(sql);
    } catch (Exception e) {
      System.err.println("Got an exception! ");
      e.printStackTrace();
      System.exit(0);
    }
  }
  public static void checkData(String sql) {
    try {
      HibernateUtil.outputResultSet(st
          .executeQuery(sql));
//      conn.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
    public static void outputResultSet(ResultSet rs) throws Exception{
    ResultSetMetaData metadata = rs.getMetaData();
    int numcols = metadata.getColumnCount();
    String[] labels = new String[numcols]; 
    int[] colwidths = new int[numcols];
    int[] colpos = new int[numcols];
    int linewidth;
      for (int i = 0; i < numcols; i++) {
        labels[i] = metadata.getColumnLabel(i + 1); // get its label
        System.out.print(labels[i]+"  ");
    }
      System.out.println("------------------------");
    while (rs.next()) {
        for (int i = 0; i < numcols; i++) {
        Object value = rs.getObject(i + 1);
        System.out.print(value.toString().trim()+"   ");
      }
    }
    }
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:data/tutorial</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <!-- Mapping files -->
        <mapping resource="Book.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

/////////////////////////////////////////////////////////////////////////

public class Book{ 
  private int id;  
  private String title; 
  private String author; 
  private String isbn; 
  private int pages; 
  private int copyright; 
  private float cost;
  public Book() {
  }
  public void setId(int i) {
    id = i;
  }
  public int getId() {
    return id;
  }
  public void setTitle(String s) {
    title = s;
  }
  public String getTitle() {
    return title;
  }
  public void setAuthor(String s) {
    author = s;
  }
  public String getAuthor() {
    return author;
  }
  public void setIsbn(String s) {
    isbn = s;
  }
  public String getIsbn() {
    return isbn;
  }
  public void setPages(int i) {
    pages = i;
  }
  public int getPages() {
    return pages;
  }
  public void setCopyright(int i) {
    copyright = i;
  }
  public int getCopyright() {
    return copyright;
  }
  public void setCost(float f) {
    cost = f;
  }
  public float getCost() {
    return cost;
  }
}

/////////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> 
<hibernate-mapping>
<class name="Book" table="books"> 
   <id name="id" type="int" unsaved-value="0">
      <generator  class="increment"/>
   </id>
   <property   name="title"/>
   <property   name="author"/>
   <property   name="isbn" not-null="true"/>
   <property   name="pages" type="integer" column="pagecount" /> 
   <property   name="copyright"/>
   <property   name="cost">
      <column     name="cost" sql-type="NUMERIC(12,2)"/> 
   </property>
</class>
</hibernate-mapping>

/////////////////////////////////////////////////////////////////////////

Java Type VS Hibernate Type

/*
Chapter 4 - Database Connecting and Schema Generation
Professional Hibernate
by Eric Pugh and Joseph D. Gradecki 
Wrox Press 2004
*/

Java Class Attribute Type         Hibernate Type               Possible SQL Type-Vendor Specific
Integer, int, long short          integer, long, short         Appropriate SQL type
char                              character                    char
java.math.BigDecimal              big_decimal                  NUMERIC, NUMBER
float, double                     float, double                float, double
java.lang.Boolean, boolean        boolean, yes_no,             boolean, int
                                  true_false
  
java.lang.string                  string                       varchar, varchar2
Very long strings                 text                         CLOB, TEXT
java.util.Date                    date, time, timestamp        DATE, TIME, TIMESTAMP
java.util.Calendar                calendar, calendar_date      TIMESTAMP, DATE
java.util.Locale                  locale                       varchar,varchar2
java.util.TimeZone                timezone                     varchar, varchar2
java.util Currency                Currency                     varchar, varchar2
java.sql.Clob                     clob                         CLOB
java.sql.Blob                     blob                         BLOB
Java object                       serializable                 binary field
byte array                        binary                       binary field
java.lang.Class                   class                        varchar, varchar2

Save Date Type

/////////////////////////////////////////////////////////////////////////
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class SimpleSaveTest {
  
  
  public static void main(String[] args) {
    HibernateUtil.setup("create table EVENTS ( EVENT_ID int, EVENT_DATE date, title VARCHAR);");
    // hibernate code start
    Session session = HibernateUtil.currentSession();
    Transaction tx = session.beginTransaction();
    Event theEvent = new Event();
    theEvent.setTitle("My Event");
    theEvent.setDate(new Date());
    session.save(theEvent);
    tx.rumit();
    HibernateUtil.closeSession();
    HibernateUtil.sessionFactory.close();
    // hibernate code end
    HibernateUtil.checkData("select * from events;");
  }

}

/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="Event" table="EVENTS">
        <id name="id" column="EVENT_ID">
            <generator class="increment"/>
        </id>
        <property name="date" type="timestamp" column="EVENT_DATE"/>
        <property name="title"/>
    </class>


    <class name="EventWithAttendee" table="eventwithattendee">
        <id name="id" column="uid" type="long" unsaved-value="null">
            <generator class="native"/>
        </id>
        <property name="name" type="string" length="100"/>
        <property name="startDate" column="start_date"
                  type="date"/>
        <property name="duration" type="integer"/>
        <many-to-one name="location" column="location_id"
                     class="Location"/>
        <set name="attendees" cascade="all">
            <key column="event_id"/>
            <one-to-many class="EventAttendee"/>
        </set>
    </class>
    <class name="EventAttendee" table="attendees">
        <id name="id" column="uid" type="long">
            <generator class="native"/>
        </id>
        <property name="firstName" type="string" length="20"/>
        <property name="lastName" type="string" length="20"/>
    </class>
    <class name="Location" table="locations">
        <id name="id" column="uid" type="long">
            <generator class="native"/>
        </id>
        <property name="name" type="string"/>
        <property name="address" type="string"/>
    </class>
</hibernate-mapping>


/////////////////////////////////////////////////////////////////////////

import java.util.Date;
public class Event {
  private Long id;
  private String title;
  private Date date;
  Event() {
  }
  public Long getId() {
    return id;
  }
  private void setId(Long id) {
    this.id = id;
  }
  public Date getDate() {
    return date;
  }
  public void setDate(Date date) {
    this.date = date;
  }
  public String getTitle() {
    return title;
  }
  public void setTitle(String title) {
    this.title = title;
  }
  public String toString() {
    return "ID:" + id + "\nTitle:" + title + "\nDate:" + date;
  }
}