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Strongly typed collections of child objects (parent-child relationships) N-level undo capability A simple and abstract model for the UI developer Full support for data binding in WPF, Windows Forms, and Web Forms Saving objects to a database and getting them back again Custom authentication Other miscellaneous features In all of these cases, the .NET Framework provides all the pieces of the puzzle, but they must be put together to match your specialized requirements. What you don t want to do, however, is to have to put them together for every business object or application. The goal is to put them together once so that all these extra features are automatically available to all the business objects and applications. Moreover, because the goal is to enable the implementation of object-oriented business systems, the core object-oriented concepts must also be preserved: Abstraction Encapsulation Polymorphism Inheritance The result is a framework consisting of a number of classes. The design of these classes is discussed in this chapter and their implementation is discussed in s 6 through 16.

Temporary tables generate a minimum amount of redo, but they still generate some redo, and there is no way to disable that. The redo is generated for the rollback data, and in most typical uses it will be negligible. If you only INSERT and SELECT from temporary tables, the amount of redo generated will not be noticeable. Only if you DELETE or UPDATE a temporary table heavily will you see large amounts of redo generated. Statistics used by the CBO can be generated on a temporary table with care; however, a better guess set of statistics may be set on a temporary table using the DBMS_STATS package or dynamically collected by the optimizer at hard parse time using dynamic sampling.

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We have already seen a partial example of an object table with nested tables. An object table is a table that is created based on a TYPE, not as a collection of columns. Normally, a CREATE TABLE statement would look like this: create table t ( x int, y date, z varchar2(25) ); An object table creation statement looks more like this: create table t of Some_Type; The attributes (columns) of T are derived from the definition of SOME_TYPE. Let s quickly look at an example involving a couple of types, and then review the resulting data structures: ops$tkyte@ORA11GR2> create or replace type address_type 2 as object 3 ( city varchar2(30), 4 street varchar2(30), 5 state varchar2(2), 6 zip number 7 ) 8 / Type created. ops$tkyte@ORA11GR2> create or replace type person_type 2 as object 3 ( name varchar2(30), 4 dob date, 5 home_address address_type, 6 work_address address_type 7 ) 8 / Type created. ops$tkyte@ORA11GR2> create table people of person_type 2 / Table created.

Tip The Diagrams folder in the Csla project in the code download includes FullCsla.cd, which shows all the framework classes in a single diagram. You can also get a PDF document showing that diagram at www.lhotka.net/ cslanet/download.aspx.

ops$tkyte@ORA11GR2> desc people Name Null ---------------------------------------- -------NAME DOB HOME_ADDRESS WORK_ADDRESS

In a nutshell, that s all there is to it. We create some type definitions, and then we can create tables of that type. The table appears to have four columns representing the four attributes of the PERSON_TYPE we created. We are at the point where we can now perform DML on the object table to create and query data: ops$tkyte@ORA11GR2> insert into people values ( 'Tom', '15-mar-1965', 2 address_type( 'Reston', '123 Main Street', 'Va', '45678' ), 3 address_type( 'Redwood', '1 Oracle Way', 'Ca', '23456' ) ); 1 row created. ops$tkyte%ORA11GR2> select name, dob, p.home_address Home, p.work_address work 2 from people p; NAME DOB HOME(CITY, STREET, STA ---- --------- ---------------------Tom 15-MAR-65 ADDRESS_TYPE('Reston', '123 Main Street', 'Va', 45678) WORK(CITY, STREET, STAT ----------------------ADDRESS_TYPE('Redwood', '1 Oracle Way', 'Ca', 23456)

Before getting into the details of the framework s design, let s discuss the desired set of features in more detail.

ops$tkyte@ORA11GR2> select name, p.home_address.city from people p; NAME HOME_ADDRESS.CITY ----- -----------------------------Tom Reston We re starting to see some of the object syntax necessary to deal with object types. For example, in the INSERT statement we had to wrap the HOME_ADDRESS and WORK_ADDRESS with a CAST. We cast the scalar values to be of an ADDRESS_TYPE. Another way of saying this is that we create an ADDRESS_TYPE instance for that row by using the default constructor for the ADDRESS_TYPE object. Now, as far as the external face of the table is concerned, there are four columns in our table. By now, after seeing the hidden magic that took place for the nested tables, we can probably guess that there is something else going on. Oracle stores all object relational data in plain old relational tables at the end of the day, it is all in rows and columns. If we dig into the real data dictionary, we can see what this table really looks like: ops$tkyte@ORA11GR2> select name, segcollength 2 from sys.col$ 3 where obj# = ( select object_id 4 from user_objects 5 where object_name = 'PEOPLE' ) 6 /

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