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All business objects will be implemented to make use of the class-in-charge scheme discussed in 1. Factory methods are used in lieu of the New keyword, which means that it s best to prevent the use of New, thereby forcing the UI developer to use the factory methods instead. The data portal mechanism requires business classes to include a default constructor. As I reviewed the create, fetch, update, and delete processes for each type of object earlier in this chapter, each sequence diagram showed how the server-side data portal created an instance of the business object. This is done using a technique that requires a default constructor. By making the default constructor Private or Protected (and by not creating other Public constructors), you ensure that UI code must use the factory methods to get an instance of any object: ' ... #Region "Factory Methods" Private Sub New() ' require use of factory methods End Sub #End Region ' ... This constructor both prevents the New keyword from being called by code outside this class and provides the data portal with the ability to create the object via reflection. Your classes might also include other non-Public constructors, but this one is required for all objects.

Note The SQL will execute with the privileges of the invoker of this routine. However, all PL/SQL calls will run

with the privileges of the definer of the called routine; therefore, the ability to use UTL_FILE to write to a directory is implicitly given to anyone with execute permission on this package.

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This chapter discussed the basic concepts and requirements for all business classes based on CSLA .NET. I discussed the life cycle of business objects and walked through the creation, retrieval, update, and delete processes. The basic structure of each type of business class was covered at a high level. There are common requirements, including making all the classes Serializable, implementing a common set of code regions for clarity of code, and including a non-Public constructor. I continue that discussion in 5 by walking through the kind of code that goes into each code region for the different object stereotypes. Then s 6 through 16 cover the implementation of the CSLA .NET framework that supports these stereotypes. Finally, s 17 through 21 show how to use these stereotypes and the framework to construct the Project Tracker application described in 3.

The package body follows We use UTL_FILE to write a control file and a data file DBMS_SQL is used to dynamically process any query We use one datatype in our queries: a VARCHAR2(4000) This implies we cannot use this method to unload LOBs, and that is true if the LOB is greater than 4,000 bytes We can, however, use this to unload up to 4,000 bytes of any LOB using SUBSTR Additionally, since we are using a VARCHAR2 as the only output data type, we can handle RAWs up to 2,000 bytes in length (4,000 hexadecimal characters), which is sufficient for everything except LONG RAWs and LOBs Additionally, any query that references a nonscalar attribute (a complex object type, nested table, and so on) will not work with this simple implementation.

The following is a 90 percent solution, meaning it solves the problem 90 percent of the time: ops$tkyte@ORA11GR2> create or replace package body unloader 2 as 3 4 5 g_theCursor integer default dbms_sqlopen_cursor; 6 g_descTbl dbms_sqldesc_tab; 7 g_nl varchar2(2) default chr(10); 8 These are some global variables used in this package body The global cursor is opened once, the first time we reference this package, and it will stay open until we log out This avoids the overhead of getting a new cursor every time we call this package The G_DESCTBL is a PL/SQL table that will hold the output of a DBMS_SQLDESCRIBE call G_NL is a newline character We use this in strings that need to have newlines embedded in them.

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