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(See the code downloads for the DomainObject class) I made sure that DomainObject would work with either a DataSet or an IDataReader because both are worthwhile in different scenarios I always want to maintain the flexibility of switching between them For example, I can cache a DataSet deep in the data access layer because it is holding onto the data, while an IDataReader is just a data enumerator that can be used only once But IDataReader is faster, so if I do not cache the data, I can leverage the speed of the IDataReader When data is pulled from the database and the code loops over the results, we will pass the DataRow or IDataReader into the load method of the business object to prepare it to be sent back to the application layer These objects are held in a FavoriteLinkCollection object, which is shown in Listing 7-31.

Listing 7-15. Adding a Second Advice Object in Application-config.xml. < xml version="1.0" encoding="utf-8" > <objects xmlns="http://www.springframework.net" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.net/aop"> <aop:config> <aop:advisor id="getAgeAdvisor" pointcut-ref="getAgeCalls" advice-ref="loggingAdvice" order="5" /> <aop:advisor id="getAgeAdvisor2" pointcut-ref="getAgeCalls" advice-ref="loggingAdvice2" order="2" /> </aop:config> <object id="getAgeCalls" type="Spring.Aop.Support.SdkRegularExpressionMethodPointcut, Spring.Aop"> <property name="patterns"> <list> <value>.*Age</value> <value>.*Name</value> </list> </property> </object> <object id="loggingAdvice" type="Aop.LoggingAdvice, Aop"/> <object id="loggingAdvice2" type="Aop.LoggingAdvice2, Aop"/> <!-- The object employeeBob is the same as before and omitted --> </objects> If you run the example with the configuration in Listing 7-15, you ll see the following output: Advice2 BeforeInvoke is called. Intercepted method is get Name. Advice BeforeInvoke is called. Intercepted method is get Name. Customer Name getter is called. Advice AfterInvoke is called. Intercepted method is get Name. Advice2 AfterInvoke is called. Intercepted method is get Name. Advice2 BeforeInvoke is called. Intercepted method is get Age. Advice BeforeInvoke is called. Intercepted method is get Age. Customer Age getter is called. Advice AfterInvoke is called. Intercepted method is get Age. Advice2 AfterInvoke is called. Intercepted method is get Age. Customer John is 5 years old. Advice2 BeforeInvoke is called. Intercepted method is get Name. Advice BeforeInvoke is called. Intercepted method is get Name. Employee Name getter is called. Advice AfterInvoke is called. Intercepted method is get Name. Advice2 AfterInvoke is called. Intercepted method is get Name.

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Listing 7-31 FavoriteLinkCollection Object using SystemCollectionsGeneric; namespace 07Domain { /// <summary> /// Collection of FavoriteLink objects /// </summary> public class FavoriteLinkCollection : List<FavoriteLink> { } } Notice that the FavoriteLinkCollection object simply inherits from the generic collection List<FavoriteLink>, which gives us a clean object that can be extended later It is also strongly typed with the FavoriteLink business object A DataSet can be used to populate a FavoriteLinkCollection, as shown in Listing 7-32 Listing 7-32 Loading with DataRow private void AddToFavoriteLinkCollection( FavoriteLinkCollection collection, DataSet ds) { if (dsTablesCount > 0) {.

Advice2 BeforeInvoke is called. Intercepted method is get Age. Advice BeforeInvoke is called. Intercepted method is get Age. Employee Age getter is called. Advice AfterInvoke is called. Intercepted method is get Age. Advice2 AfterInvoke is called. Intercepted method is get Age. Employee Bob is 30 years old. Try changing the order attribute of getAgeAdvisor in application-config.xml from 5 to 1. Then run the example again and see what the output is.

Then the body of the function is enclosed in braces ({ }) followed by optional redirection (see the uinfo function later in this chapter for an example) The first set of tests is contained in a case statement: case $1 in "" | *[!0-9]* | *[!0-9]) return 1 ;; esac It checks for an empty string, invalid characters, or an address that doesn t end with a digit If any of these items is found, the shell builtin command return is invoked with an exit status of 1 This exits the function and returns control to the calling script An argument sets the function s return code; if there is no argument, the exit code of the function defaults to that of the last command executed.

foreach (DataRow row in dsTables[0]Rows) { FavoriteLink fl = new FavoriteLink(row); collectionAdd(fl); } } } A constructor for the FavoriteLink object simply takes a DataRow and internally calls the load method defined by the DomainObject Alternatively, an IDataReader could be used for potentially better performance, as shown in Listing 7-33 Listing 7-33 Loading with IDataReader private void AddToFavoriteLinkCollection( FavoriteLinkCollection collection, IDataReader dr) { while (drRead()) { FavoriteLink fl = new FavoriteLink(dr); collectionAdd(fl); } } The FavoriteLink object also includes a constructor that takes an IDataReader, which is passed along to the load method In the case of the DataSet and the IDataReader, the columns used to populate FavoriteLink should be identical, especially when they call the same stored procedures.

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