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As a more general solution, CSLA .NET includes a utility class that uses SqlDataReader (or any IDataReader implementation) in such a way that you never have to worry about null values again. Unfortunately, the SqlDataReader class isn t inheritable; it can t be subclassed directly. Instead, it is wrapped using containment and delegation. The result is that your data access code works the same as always, except that you never need to write checks for null values. If a null value shows up, SafeDataReader will automatically convert it to an appropriate empty value. Obviously, if you do care about the difference between a null and an empty value, you can just use a regular SqlDataReader to retrieve the data. Starting in .NET 2.0, you can use the Nullable<T> generic type that helps manage null database values. This new type is very valuable when you do care about null values: when business rules dictate that an empty value such as 0 is different from null.

The topic of performance will spark debate among framework authors, users, and even commercial software vendors. The fact is, at a low level all frameworks incur some sort of overhead. Generally, if you compare handcoded JDBC to iBATIS and iterate it 1,000,000 times in a for loop, you ll likely see a performance hit in favor of JDBC. Fortunately, this is not the kind of performance that matters in modern application development. What is much more significant is how you fetch data from the database, when you fetch it, and how often. For example, using a paginated list of data that dynamically fetches records from the database can significantly increase the performance of the application because you aren t unnecessarily loading potentially thousands of records from the database at once. Similarly, using features like lazy loading will avoid loading data that isn t necessarily used in a given use case. On the other hand, if you know for certain that you have to load a complex object graph that involves a large amount of data from a number of tables, loading it using a single SQL statement will improve performance greatly. iBATIS supports a number of performance optimizations that we ll discuss in more detail later. For now, it is important to know that iBATIS can usually be configured and used in such a way that is simple, yet it performs as well as JDBC, or possibly better. Another important consideration is that not all JDBC code is well written. JDBC is a complex API that requires a lot of care to code correctly. Unfortunately, much JDBC code is poorly written and therefore will not even perform as well as iBATIS at a low level.

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Deleting a record is similar If the data source is ready, you can invoke the deleteCurrentItem method on the parent ItemView control You control access to the button (and thus the deletion) by disabling the button when the dataSource isn t ready: <button targetElement="delButton"> <bindings> <binding dataContext="dataSource" dataPath="isReady" property="enabled"/> </bindings> <click> <invokeMethod target="detailsView" method="deleteCurrentItem" /> </click> </button> Saving data is a little more complex You should save data only when the dataset is considered dirty and the dataSource is considered ready Remember that the binding is two-way, so when you type something into either of the text boxes, their binding to the itemView will update the dataset within the itemView, and it, in turn, will update the dataset within the dataSource control Thus, the dataSource will be considered dirty Once it is also ready, then the isDirtyAndReady flag will be true.

import javax.sql.DataSource; import javax.ejb.EJBException; import org.jdom.Document; /** * A session bean that retrieves customer * data as a JDOM Document */ public class CustomerDataBean implements javax.ejb.SessionBean { public javax.ejb.SessionContext ctx; // transient so it won't be // serialized on passivation public transient CustomerDAO cDAO; public void ejbCreate() { buildDAO(); Retrieves data } from DAO /** * Get a JDOM Document containing the specified * customer's information. * @param customerId Unique ID of the customer * @return JDOM containing the customer information * @throws CustomerNotFoundException */ public org.jdom.Document getCustomerInfo(String customerId) throws CustomerNotFoundException { Document custData = cDAO.getCustomerInfo(customerId); Gets JDOM Document from DAO return custData; } protected void buildDAO() throws EJBException { // look up data source in environment // and pass to the data access object's

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