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Wow! Can you believe that Similarly, you can use the em.remove and em.merge methods to migrate the JDBC code for remove or update operations. Next we ll explain how you can migrate your SQL SELECT statements to use JPQL.

Although it may be a little difficult to let go, you have to remember that there are no equivalents for ResultSet and Rowset in the EJB 3 JPA. Most typical applications use SQL statements to retrieve data and construct transfer objects, which are returned to the client instead of returning a ResultSet. Not following the DAO and Transfer Object design patterns will mean additional work for you. Listing 14.7 shows a method in the BidDAOImpl class that returns a list of BidTOs by retrieving a ResultSet from the database.

When an entity bean uses a primary key class, the entity bean source must be altered to meet certain requirements. Listing 3.10 shows the PortfolioHoldingBean entity bean that uses a HoldingKey instance for a primary key.

public ArrayList getBids(Long itemId) throws BidDAOException { PreparedStatement stmt = null; ResultSet result = null; Connection dbConnection = null; ArrayList bids = new ArrayList(); try { dbConnection = DAOUtils.getDBConnection("jdbc/ActionBazaarDS"); stmt = dbConnection.prepareStatement("SELECT " + "BID_ID,BID_STATUS, BID_PRICE FROM BIDS WHERE ITEM_ID = "); stmt.setLong(1, itemId); Contains JDBC result = stmt.executeQuery(); statements if (!result.next()) { throw new BidDAOException("No Bid found for item:" + itemId); } // do { int i = 1; Long bidId = result.getLong(i++); String bidStatus = result.getString(i++); Double bidPrice = result.getDouble(i++); bids.add(new BidTO(BidId, bidStatus, bidPrice)); } while(result.next());

With our implementation of the Observer and Command design pattern, the abstract receiver pointcut will designate the objects where the Chain of Responsibility pattern needs to be integrated. The abstract execute pointcut defines the condition, which triggers the execution of the chain. The after advice (line 7) calls the abstract method handle. This method will be concretized into subaspects to define the behavior implemented by each command in the chain.

return(bids); } catch (SQLException se) { ... } finally { DAOUtils.closeResultSet(result); DAOUtils.closeStatement(stmt); DAOUtils.closeConnection(dbConnection); } }

public abstract class PortfolioHoldingBean implements EntityBean { public HoldingKey ejbCreate( String symbol, String portfolioName ) throws CreateException{ Defines a create setSymbol( symbol ); method to accept setPortfolioName( portfolioName ); pk fields return null; Returns null } abstract public String getPortfolioName(); abstract public void setPortfolioName( String portfolioName ); abstract public String getSymbol(); abstract public void setSymbol( String Symbol ); //other bean methods not shown }

The method in listing 14.7 constructs a list of transfer objects of type BidTO c by executing a JDBC SQL statement b and returns d them to the client. Assuming you have created an entity named Bid that corresponds to the BidTO transfer object, you can easily migrate this method to use JPQL and the EntityManager API. You can use a dynamic query in the getBids method as follows:

public List getBids(Long itemId) { Item item = (Item)em.find(Item.class, itemId); Query query = em.createQuery("SELECT b FROM Bid b WHERE b.item = 1"); Query.setParameter(1, item);

We now define two simple commands, Step1ChainAspect and Step2ChainAspect, which will be put in a chain (see Listing 8-18). Listing 8-18. Concrete Aspect to Bind the Chain of Responsibility Design Pattern to the Stats Class 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 package aop.patterns.chainOfResponsibility; public aspect Step1ChainAspect extends AbstractChainAspect { protected pointcut receiver() : initialization(Stats.new(..)); protected pointcut execute() : call(void Stats.incOrders()); protected void handle() { System.out.println("OrderHandler 1"); } } public aspect Step2ChainAspect extends AbstractChainAspect { declare precedence : Step1ChainAspect; protected pointcut receiver() : initialization(Stats.new(..)); protected pointcut execute() : call(void Stats.incOrders()); protected void handle() { System.out.println("OrderHandler 2"); } }

In the bean deployment descriptor (see listing 3.11), you must declare the primary key classname and its persistent fields.

return query.getResultList(); }

However, we recommend using a named query instead of a dynamic query, and moving the JPQL statement to the Bid entity as a named query like this:

<entity> <ejb-name>portfolioHoldingBean</ejb-name> <home>compoundKey.PortfolioHoldingHome</home> <remote>compoundKey.PortfolioHolding</remote> <ejb-class>compoundKey.PortfolioHoldingBean</ejb-class> <persistence-type>Container</persistence-type> <prim-key-class>compoundKey.HoldingKey</prim-key-class> <reentrant>False</reentrant> <cmp-field> <field-name>symbol</field-name> </cmp-field> <cmp-field> <field-name>portfolioName</field-name> </cmp-field> </entity> <!-- =========[ PortfolioHolding Bean ]======== --> </enterprise-beans> </ejb-jar>

@Entity @NamedQuery( name = "findBidsByItem", query = "SELECT b FROM Bid b WHERE b.item = 1") public class Bid implements Serializable { ... }