My class name is 'mycontact'.It is a public class and I didn't use package to place this class. It is a value bean
In that class I declared three fields(
Id,name and phone). Each of them is String type.
This class has a no-argument consructor and a parameterized constructor with three parameters to initialize Id, name and phone. And setter / getter methods for each field.
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There is a hibenate.properties file In which we have to mention the dialect, driver and the url of the mycontactstable.
hibernate.dialect =
net.sf.hibernate.dialect.MySQLDialect
hibernate.connection.driver_class =
com.mysql.jdbc.Driver
hibernate.connection.url =
jdbc:mysql://localhost/mycontacts
hibernate.connection.username = root
hibernate.connection.password
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and the third important file is mapping file (mycontact.hbm.xml). I have shown the essential elements.
<hibernate-mapping>
<class name="mycontact" table="mycontactstable">
<id name="id" column="ID" unsaved-value="0">
<generator class="assigned"/>
</id>
<property name="name" type="string" />
<property name="phone" type="string" />
</class>
</hibernate-mapping>
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( I have not shown the DTDeclaration).
The most important part is setting the classpath.
It should have the following jar files.
1. cglib-full-2.0.2.jar;
2. commons-collections-2.1.1.jar;
3. commons-logging-1.0.4.jar;
4. dom4j-1.4.jar;
5. ehcache-0.9.jar;
6. jdbc2_0-stdext.jar;
7. jta.jar;
8. log4j-1.2.8.jar;
9. xerces-2.4.0.jar;
10. xml-apis.jar;
11. hibernate2.jar;
12. commons-pool-1.2.jar;
13. commons-dpcp-1.2.1.jar;
14. mysqldriver.jar;
All these files are available in hibernate\lib.
So we set the classpath accordingly.
=======
I then created a bean for using hibernate.
As in my previous blog, I think , best thing is to mention the operation also in the bean's method.
The method name is 'edit'.
It has 4 arguments. ( namely name, phone, id and operation).
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There is a common portion for all the operations. like:
The function is:
public String edit
( String a, String b, String c, String d)
----
a is name
b is phone
c is Id
d is operation.
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SessionFactory factory = null;
System.out.println("Creating session factory");
String r="";
try
{
Configuration cfg = new Configuration();
cfg.addClass(mycontact.class);
factory = cfg.buildSessionFactory();
System.out.println("sessionfactory ready");
Transaction tx = null;
Session session = factory.openSession();
tx = session.beginTransaction();
***************************************************************************************************
And for a add record,
mycontact mycontact1 = new mycontact(a,b,c);
session.save(mycontact1);
------------------------------------------
for removing,
mycontact mycontact1 =
(mycontact)session.get(mycontact.class,c);
session.delete(mycontact1);
------------------------------------------
to find a record,
mycontact mycontact1 =
(mycontact)session.get(mycontact.class,c);
String n=mycontact1.getName();
String m=mycontact1.getPhone();
System.out.println(n+"\t"+m);
r=n+"......."+m;
------------------------------------------
to show all the records,
java.util.List list1 = session.find("from mycontact");
Iterator i=list1.iterator();
while(i.hasNext())
{
mycontact mycontact1 = (mycontact)i.next();
r=r+mycontact1.getId()+"\t";
r=r+mycontact1.getName()+"\t";
r=r+mycontact1.getPhone()+"\t";
}
------------------------------------------
and for modifying,
mycontact mycontact1 =
(mycontact)session.get(mycontact.class,c);
mycontact1.setName(a);
mycontact1.setPhone(b);
************************************************
After carrying out the operation,
the session and transaction are to be properly handled as shown.
tx.commit();
session.flush();
session.close();
==============================================
After creating the bean and compiling, I created a simple console program as shown below.
besthiberbean bean = new besthiberbean();
String r = bean.edit(a,b,c,d);
System.out.println(r);
===
I got correct results.
( >java besthiberbean gopal 34251 200 add
etc).
***
Now, our component is ready! After trying with a package, I can use it anywhere, be it frame or servlet or jsp or struts!
That is for integration of hibernate with Struts.
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