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Project Struts in Netbeans JPA better understand the J2EE library management

Well before the JPA example in netbeans
showed a very simple example of using this library, but it is necessary to better understand
enter the library, since in reality
we will not face simple examples.

found this video to share, plus other interesting link
the subject.




and also a good link to enter more in detail.

http://www.javadabbadoo.org/cursos/infosintesis.net/javaee/implementarJPA/consultarUsuariosVWJSF/index.html
http://www.javaguicodexample.com/javavisualwebdatabaseappdev.html
http://schuchert.wikispaces.com/JPA+Tutorial+1+-+Getting+Started
http://java.pragmasoftware.com.mx/wikijava/en/Special:History?topicVersionId=100&topic=Java_Persistance_API
http://www.roseindia.net/software-tutorials/detail/24071
http://www.oracle.com/technology/products/ias/toplink/jpa/examples/jsf-jpa-example.html
http://www.netbeans.org/kb/60/web/jsf-jpa-crud-part1.html
http://java.sun.com/javaee/5/docs/tutorial/doc/bnbpz.html
http://luchorondon.blogspot.com/2009/04/jpa-java-persistence-api.html

a link to work in eclipse
http://wiki.eclipse.org/EclipseLink/Examples / JPA

also exists the concept of relationship between entities

http://es.debugmodeon.com/articulo/relaciones-en-jpa
http://www.roseindia.net/jpa/eclipsejpaexamples / jparelationship / index.shtml

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table in jsf with hibernate hibernate

this example is very simple, we will fill
a table with netbeans visual web of data
a database table.

first have to generate a configuration
with jsf hibernate (which can be seen in http://ungranoparajava.blogspot.com/2009/10/jsp-con-framework-hibernate.html ) and also have to add
as the visual web framework.


here we must bear in mind that deal Query
not SQLQuery, because we have HQL ocuapar corresponding to
first mentioned, because we are working with objects.


after the init method to add the method call
mostrarEmpresa ()


@ Override public void init () {

super.init ();


try {_init ();
} catch (Exception e) {
log ("SessionBean1 Initialization Failure", e) throw e instanceof
FacesException? (FacesException) e: new FacesException (e);}


mostrarEmpresa ();}


Business class is found here, which is the representation


then look for the property table table layout

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Part 2

In the previous example we saw how to configure a jsp project Framewor
and Hibernate, but we need to see how to save (insert)
in the database, this process is very simple and we will make
as follows:

in class: consulta_empresa company created a method to keep public String

guardar_empresa (Empresa em) {try {



org.hibernate.Transaction session.beginTransaction tx = ();
Session.save (em);

tx.commit () ;
return "Company saved"

} catch (Exception e) {
e.printStackTrace ();}



return "Error";

}}

the method returns the type that we can leave as
more we accommodate us, but we spent importate an object type that this company
seti its parameters with the set that has
this object already created and that is the representation of the table
database.

consulta_empresa class has the following.

Session session = null;
public
consulta_empresa () {
this.session = NewHibernateUtil.getSessionFactory (). GetCurrentSession ();}

newHibernateUtil
and is the class we created earlier
(to understand it is necessary to see previous article)

this is the code I have in a jsp page to call the method guardar_empresa
.
<% if(request.getParameter("guardar")!=null){ out.println("nombre: "+request.getParameter("nombre")); Empresa e=new Empresa(); e.setNombre(""+request.getParameter("nombre")); e.setDireccion(""+request.getParameter("direccion")); e.setRut(""+request.getParameter("rut")); consulta_empresa co=new consulta_empresa(); String respuesta; respuesta=co.guardar_empresa(e); out.println("br "); out.println("center "+respuesta+" /center"); } %>

As next step is to better understand the language that has
Hibernate HQL.

http://www.java2s.com/Code/Java/Hibernate/CatalogHibernate.htm

http://www.acsinet-solutions.com/es/tutoriales/hibernate/01-mapeo_sencillo.html

Basic Configuration Mapping Single with Spring Framework:

http : / / www.acsinet-solutions.com/es/tutoriales/hibernate/02-mapeo_sencillo.html

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java Hibernate is a tool that performs the mapping between
oriented world object-world applications and
entity-relationship databases in Java environments. The term used is
ORM (object / relational mapping) and technology is making the transition
a representation of the data in a relational model
an object-oriented model and vice versa. Hibernate

not only does this this transformation but provides capabilities for collecting and storing data from the database that we reduce development time.

the structure of this framework we can see in an article in my blog:

Http://ungranoparajava.blogspot.com/2009/06/arquitectura-de-la-persistencia.html

we will see a small example of this framework with jsp and as always with Netbeans IDE

1 .- create our web project

2 .- assign the name, next and select the hibernate framework and also the basis of data that we will work

2.1-based data have to be registered, as we see in Figure

3 .- add these Two configurations are shown in the hibernate.cfg.xml file

the configuration can be seen in xml format, this is where the settings are saved
the framework.

4 .- let's create the objects related to the data base we select

5 .- now generate the hbm.xml of each table is related to an object of type beans

5.1 Although we have the draft

6 .- generate the kind newhibernateUtil

7 .- generate a class: consulta_empresa, which consists of a constructor and method which provides a Query (obs : hibernate HQL to query occupies)

8 .- Now go to our index and insert this code very simple

for more information https: / / www.hibernate. org /

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