MyEclipse 3.15 Style - Up to 25% Off Buy Online! Hot open grab>>
【MyEclipse latest version download】
This tutorial introduces some of the JPA/Spring based features in MyEclipse. For the basics of setting up a JPA project, read the JPA tutorial first . This tutorial focuses on JPA-Spring integration in MyEclipse and how to take advantage of these functions. You will learn:
- Build a project for JPA and Spring
- Reverse engineer a database table to generate entities
- Implement create, retrieve, edit and delete functions
- Enable container-managed transactions
Duration: 30 minutes
Don't have MyEclipse? Download now
4. Enable Spring Container Managed Transactions
In addition to user-managed transactions, Spring also supports container-managed transactions through the @Transactional attribute. For container-managed transaction support, it must be enabled when you add facets, as described in the previous section.
Enable support for @Transactional annotation
Enabling it will add the following transaction element to your bean configuration file. You should also add a JPAServiceBean which is used to delete transaction entities managed using the container. See the implementation below:
Annotation-driven configuration elements
The JPAServiceBean implementation is shown below; note the @Transactional annotation on the deleteProductLine method and the lack of any user-managed transaction statements.
public class JPAServiceBean {
private IProductlineDAO dao; @Transactional public void deleteProductLine(String productlineID) { /* 1. Now retrieve the new product line, using the ID we created */Productline loadedProductline = dao.findById(productlineID); /* 2. Now let's delete the product line from the DB */ dao.delete(loadedProductline); /* * 3. To confirm the deletion, try and load it again and make sure it * fails */
Productline deletedProductline = dao.findById(productlineID);
/* * 4. We use a simple inline IF clause to test for null and print * SUCCESSFUL/FAILED */
System.out.println("Productline deletion: " + (deletedProductline == null ? "SUCCESSFUL" : "FAILED"));} public void setProductLineDAO(IProductlineDAO dao) { this.dao = dao; }
}
Get an instance of JPAServiceBean from the application context and use it as follows:
JPAServiceBean bean = (JPAServiceBean) ctx.getBean("JPAServiceBean");
bean.deleteProductLine(productlineID);