Niroshan's Blog: June 2012

Sunday, June 10, 2012

Simple JPA Example

In ySchool-mini week 4 assignment I did a simple JPA ( Java Persistence API) Project. In this project I used the same scenario (scenario-3) that was used in assignment-2 and assignment-3.

What is JPA?

The Java Persistence API is a Java specification for accessing, persisting, and managing data between Java objects / classes and a relational database.

JPA

Scenario 3:

a) Student marks can be entered entered in the following way

Student Name (StudentName loaded in ComboBox), Grade (1-13 ComboBox), Subject, Marks

b) User can enter these values and click "Add"

c) Here all those fields are mandatory and marks cannot be more than 100

d) System should validate those fields and show it in the response page

The source code is uploaded in github.
https://github.com/Niroshan06/yschool_mini_nirosh_ass4

First I created mysql database (student) in netbeans. You can follow this link. Connecting to a MySQL Database.

After create the database the netbeans was look like this.

Student database

Then I created a maven project ( yschool_mini_nirosh_ass4 ) in netbeans. Project structure was look like this.

Project structure

In index.jsp I added code for main page.

Main page

Then I created an entity class name "StudentsMarks".

Right click on SourcePackages(jsf.yschool_mini_nirosh_ass4) ---> New --->

Entity Class.. --->

Creating an Entity class.

Next ---> select "student" as Database Connection ---> finish.

Setup database connection.

In this Entity class (StudentsMarks.java) I added four variables String name, String grade, String subject and int marks. Then created getter and setter methods for this four variables.

Then I created a Servlet, name "controller".

Right click on SourcePackages(jsf.yschool_mini_nirosh_ass4) ---> New --->

Servlet

In controller.java I added a method "persist"

persist method

Then I wrote some codes in dopost method. You can get full codes from github.

https://github.com/Niroshan06/yschool_mini_nirosh_ass4

When I run the project....

After click Add button a table "studentsmarks" was created automatically in the database "student".

studentsmarks table

To view the table values...

Right click on the table (studentsmarks) ---> View Data...

Values in the table

Saturday, June 9, 2012

Simple JSF Project

In ySchool-mini week-3assignment I did a simple JSF (JAVA Server Faces) project.

In this project I use the same scenario that I used in Assignment-2.

Scenario 3:

a) Student marks can be entered entered in the following way

Student Name (StudentName loaded in ComboBox), Grade (1-13 ComboBox), Subject, Marks

b) User can enter these values and click "Add"

c) Here all those fields are mandatory and marks cannot be more than 100

d) System should validate those fields and show it in the response page

The full coding is uploaded in github. https://github.com/Niroshan06/yschool_mini_nirosh_ass3

My project structure is look like this.


Project Structure

First I created a maven project using netbeans.

Then I added a JSF page name addMarks.

Right click on project----> New----> JSF page

JSF Page

In addMarks.xhtml following code is generate automatically.

The first is standard practice for XHTML pages. The second two directives allow the Facelets page to use the JSF Core and HTML tag libraries that are provided in the JSF specification, which in turn allows the Facelets page to use the underlying JSF UI components in the page.

I added more codes in addMarks.xhtml to create the main page.


Main page

For the"Subject" text box I wrote the following code

   <h:inputText label="Subject"
             id="subject"
           value="#{userBean.subject}"
           required="true"/>
                  <h:message for="subject" />

      Here the required attribute is set to "true". So when we click Add button with empty Subject, it will give an error message for subject.
      In value attribute, it provides direct linkage to the subject property of the managed bean userBean. Basically, a managed bean is an officially registered Java class for a JSF application.

Then I created managed bean, name "userBean".

Right click on package---->New---->other---->JavaServer Faces---->JSF Managed Bean

Managed Bean

In userBean.java I added four variables String stuName, int grade, String subject and int marks. Then created getter and setter methods for this variables.

When I run the project......


Subject is empty.

Niroshan's Blog

Sunday, June 10, 2012

Simple JPA Example

What is JPA?

Saturday, June 9, 2012

Simple JSF Project

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