| 21. 21. 4. Composed ID |
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File: AccAcc.java |
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import java.io.*;
public class AccAcc implements Serializable {
private String id;
private int accountnum;
private String acctype;
private String name;
public AccAcc() {
}
public AccAcc(int i, String t, String n) {
accountnum = i;
acctype = t;
name = n;
}
public void setId(String s) {
id = s;
}
public String getId() {
return id;
}
public void setAccountnum(int i) {
accountnum = i;
}
public int getAccountnum() {
return accountnum;
}
public void setAcctype(String s) {
acctype = s;
}
public String getAcctype() {
return acctype;
}
public void setname(String s) {
name = s;
}
public String getName() {
return name;
}
public boolean equals(Object obj) {
if (obj == null) return false;
if (!this.getClass().equals(obj.getClass())) return false;
AccAcc obj2 = (AccAcc)obj;
if (this.id.equals(obj2.getId()) &&
this.accountnum == obj2.getAccountnum() &&
this.acctype.equals(obj2.getAcctype()) &&
this.name.equals(obj2.getName())) {
return true;
}
return false;
}
public int hashCode() {
int tmp = 0;
// Method 1-Concatenate the strings
tmp = (id + accountnum + name + acctype).hashCode();
return tmp;
}
}
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File: AccAccTest.java |
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import java.io.*;
import java.util.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
public class AccAccTest {
public static void main(String [] args) {
try {
Session session = HibernateUtil.currentSession();
AccAcc acc = new AccAcc(1, "Personal", "John");
session.save(acc);
session.flush();
AccAcc acc2 = new AccAcc();
acc2.setId(1+"Personal"+"John");
session.load(acc2, acc2.getId());
session.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
class HibernateUtil {
public static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
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();
if (s == null) {
s = sessionFactory.openSession();
session.set(s);
}
return s;
}
public static void closeSession() throws HibernateException {
Session s = (Session) session.get();
if (s != null)
s.close();
session.set(null);
}
}
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File: AccAcc.hbm.xml |
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<?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="AccAcc"
table="accacc">
<composite-id name="id"
class="string">
<key-property name="accountnum"/>
<key-property name="acctype"/>
<key-property name="name"/>
</composite-id>
</class>
</hibernate-mapping>
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File: hibernate.cfg.xml |
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<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1/test</property>
<property name="connection.username">oost</property>
<property name="connection.password">oost</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>
<!-- Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">create</property>-->
<mapping resource="User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
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 Download: HibernateComposedID.zip( 4,376 k) |