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In the Factory Methods region, Shared factory methods create, retrieve, and delete the object Of course, these are just examples that you must change as appropriate You must tailor the accepted parameters to match the identifying criteria for your particular business object The example code uses the CSLA NET SingleCriteria class As discussed in 4, if your object requires more complex criteria, you ll need to create your own criteria class The criteria stereotype is discussed later in this chapter Finally, the Data Access region includes the DataPortal_XYZ methods These methods must include the code to load defaults, retrieve object data, and insert, update, and delete object data, as appropriate In most cases, you do this through ADONET, but you could just as easily implement this code to read or write to an XML file, call a web service, or use any other data store you can imagine.

Here, you see that nulls sort first, followed by integers and reals, followed by texts and then blobs. The following SQL shows how these values compare with the integer 1,000. The integer and real values in b are less than 1,000 because they are numerically compared, while text and blob are greater than 1,000 because they are in a higher storage class. sqlite> select rowid, b, typeof(b), b<1000 from domain order by b; rowid ----5 1 3 2 4 b ----NULL 3.142 3142 3.142 1B typeof(b) -------null real integer text blob b<1000 ---------NULL 1 1 0 0

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You can safely omit the DataPortal_Create() method if your object doesn t require any initialization when you create it If your object does require default values to be loaded into properties (hard-coded from a config file or from a database table), then you should implement the method to initialize those values Notice the RunLocal attribute on the DataPortal_Create() method <RunLocal()> _ Protected Overrides Sub DataPortal_Create() End Sub This attribute is used to force the data portal to run the method locally You use this attribute for methods that do not need to interact with server-side resources (like the database) when they are executed Typically, you would use this attribute only on DataPortal_Create() and only if you don t need to load default values from a database table into a new object.

The use of the RunLocal attribute is optional, and when you use this attribute, the decorated DataPortal_XYZ method must not access the database, because it may not be running in a physical location where the database is available The Transactional attributes on the methods that insert, update, or delete data specify that those methods should run within a SystemTransactionsTransactionScope transactional context <Transactional(TransactionalTypesTransactionScope)> _ Protected Overrides Sub DataPortal_Update() End Sub You may opt instead to use the TransactionTypesEnterpriseServices setting to run within a COM+ distributed transaction or the TransactionTypesManual setting to handle your own transactions using ADONET or stored procedures..

The primary difference between type affinity and strict typing is that type affinity will never issue a constraint violation for incompatible data types. SQLite will always find a data type to put any value into any column. The only question is what type it will use to do so. The only role of a column s declared type in SQLite is simply to determine its affinity. Ultimately, it is the column s affinity that has any bearing on how values are stored inside of it. However, SQLite does provide facilities for ensuring that a column may only accept a given type or range of types. You do this using check constraints, explained in the sidebar Makeshift Strict Typing later in this section.

channel such as Secure Sockets Layer (SSL). However, SSL provides no protection if the authorized client decides to conduct a replay attack. Other protective measures are required. The strategies that are outlined in this section assume that you want to prevent replay attacks by verifying request messages for uniqueness and verifying that they have not been tampered with.

Tip Many organizations use an abstract, metadata-driven Data Access layer. In environments like this, the business objects don t use ADO.NET directly. This works fine with CSLA .NET, since the data access code in the DataPortal_XYZ methods can interact with an abstract Data Access layer just as easily as it can interact with ADO.NET directly.

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