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The executedTx method of line 15 gathers two independent functions that would benefit from being explicitly coded within the functional implementation: the Tx EJB creation (line 33), and the invocation of setBalance (line 32) on an account. As shown in the code, the Tx EJB creation uses a database-related method: DBHelper. getNextTxId (line 31), which returns the next available transaction identifier. This operation is a low-level operation that should probably not be used within a business method. Conceptually speaking, we can classify all the presented operations Home interface resolving, account lookup from a primary key, and instantiation of the Tx EJB within a reference-managing concern. This concern depends highly on the J2EE infrastructure and on the EJB model. This is clearly a crosscutting concern for all EJB accessing or for the creation of EJBs, particularly the session EJBs. The use of design patterns such as the locator can make the code less dependent on the infrastructure and minimize the design efforts through reuse. However, it is then the use of the pattern that becomes a crosscutting concern. Furthermore, the use of a locator pattern still requires an indirect use of the EJB model.

@NamedNativeQuery( name = "findUserWithMoreItems", query = "SELECT user_id , first_name , last_name, birth_date FROM users WHERE user_id IN ( SELECT seller_id FROM items GROUP BY seller_id HAVING COUNT(*) > )", hints = {@QueryHint(name = "toplink.cache-usage", value="DoNotCheckCache")}, resultClass = actionbazaar.persistence.User.class)

<project name="${PROJECT_NAME}" default="all" basedir="."> <!-- set global properties for this build --> <property environment="env"/> Loads the build <property file="build_ejb.properties"/> properties file <target name="all" depends="init, compile_ejb, jar_ejb, ejbc, deploy_jar"> <echo>---------[ Project name: ${PROJECT_NAME} Completed ]---</echo> Executes the build system </target> <!-=========================================================== Setup ready for build. Create all the necessary Directories ======================================================= --> <target name="init"> <tstamp/> <echo>----[ Creating all Directories and copying XML files ]</echo> <mkdir dir="${BUILD}"/> <mkdir dir="${EJB_BUILD}"/> Creates necessary <mkdir dir="${EJB_BUILD}/META-INF"/> directories </target> <!-=================================================== Clean the files up ======================================================== --> <target name="clean"> <tstamp/> <echo>---[ Cleaning the Compiled and Deployed Files ]----</echo> Deletes the build <delete dir="${BUILD}"/> directory and contents </target> <! ===================================================== Compile the EJB Source Files ===================================================== -->

Next, if our query returns more than one entity class, we must define SqlResultSetMapping in the entity class using resultSetMapping as follows:

@NamedNativeQuery( name = "findUserWithMoreItems", query = "SELECT user_id , first_name , last_name, birth_date FROM users WHERE user_id IN (SELECT seller_id FROM items GROUP BY seller_id HAVING COUNT(*) > )", resultSetMapping = "UserResults")

AOP, and more precisely the previously discussed implicit protocol technique, significantly simplifies the design and efficiently modularizes the reference-resolving crosscutting concern. First, we defined the reference accessing protocol in the EJB itself, as shown in Listing 11-11. In our program, it is a POJO since it automatically implements the javax.ejb.SessionBean interface through the POJOSession aspect. This POJO, named TxControllerPOJO, will be detailed in the rest of the chapter, once all the applied aspects have been presented.

<target name="compile_ejb" depends="init"> <tstamp/> <echo>---[ Compiling EJB Source Files ]------------</echo> <javac srcdir="${EJB_SOURCE}" destdir="${EJB_BUILD}" > <classpath> <pathelement location="${EJB_JAR}"/> <pathelement location="${INCLUDE_JARS}"/> </classpath> Builds the EJB </javac> class files </target> </project>

You can provide a vendor-specific hint using the queryHint element of the NamedNativeQuery. It is similar to the hints element for NamedQuery discussed in section 10.2.4.

Summary

After creating these two files, make sure you put them in the directory structure that is described by the project. For instance, in this recipe, they should be in the same directory, one level above the source directory. From a command prompt, change to the directory and execute the following command:

There is no difference in executing a named native SQL query and a JPQL named query except that a named parameter in native SQL query is not required by the JPA spec.

Listing 11-11. The Implicit Protocol for EJB Resolving [...] // excerpt of the TxControllerPOJO implicit resolving protocol implementation private Collection findTxByAccountId(Date startDate, Date endDate,String accountId) throws Exception {return null;} private Tx findTxByPrimaryKey(String txId) throws Exception {return null;} private Account findAccountByPrimaryKey(String accountID) throws Exception {return null;} private Tx createTx(String accountId, Date date, BigDecimal amount, BigDecimal newBalance, String description) throws Exception {return null;} We now define the aspect implementing this protocol. In our study, this aspect is called the EJBResolver aspect, which is an abstract aspect extended by the POJOSession and POJOEntity concrete aspects. The purpose of the EJBResolver aspect is to implement common behaviors for reference-resolving implementation, as shown in Listing 11-12. Listing 11-12. The Aspect Implementation of the EJB Resolving Implicit Protocol 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 package aop.j2ee.business.aspect; import import import import import import import import java.util.Collection; java.util.Date; java.math.BigDecimal; aop.j2ee.business.entity.account.AccountHome; aop.j2ee.business.entity.account.Account; aop.j2ee.business.entity.tx.TxHome; aop.j2ee.business.entity.tx.Tx; aop.j2ee.business.aspect.sql.DBUtil;