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sender and a SavedEventArgs parameter. This SavedEventArgs parameter contains a reference to the new object that is returned as a result of the Save() method call. The Saved event is intended to address the complexity that occurs when your business object is referenced in numerous locations throughout your application, by multiple forms in the UI, for instance. If you call Save() on the object in one location, all the other places where that object is referenced must be updated to use the new object returned as a result of Save(). The Saved event provides a solution because it is a standard, centralized event that provides this notification. Any code holding a reference to a business object can handle the Saved event. That code will be notified when that object has been saved. The code can then update its reference to use the new object returned as a result of the Save() call.

In order to create the SCOTT demonstration tables, you will simply: cd [ORACLE_HOME]/sqlplus/demo run demobld.sql when connected as any user

Note In Oracle 10g and above, you must install the demonstration subdirectories from the Companion CD. I have reproduced the necessary components of demobld.sql below as well.

The SmartDate type extends DateTime to provide the concept of an empty date. It also adds the ability to convert the value into and out of a String representation to simplify binding the value to a TextBox type control in the UI.

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demobld.sql will create and populate five tables. When it is complete, it exits SQL*Plus automatically, so don't be surprised when SQL*Plus disappears after running the script it s supposed to do that. The standard demo tables do not have any referential integrity defined on them. Some of my examples rely on them having referential integrity. After you run demobld.sql, it is recommended you also execute the following: alter table emp add constraint emp_pk primary key(empno); alter table dept add constraint dept_pk primary key(deptno); alter table emp add constraint emp_fk_dept foreign key(deptno) references dept; alter table emp add constraint emp_fk_emp foreign key(mgr) references emp; This finishes off the installation of the demonstration schema. If you would like to drop this schema at any time to clean up, you can simply execute [ORACLE_HOME]/sqlplus/demo/demodrop.sql. This will drop the five tables and exit SQL*Plus.

In the event you do not have access to demobld.sql, the following is sufficient to run the examples in this book: CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL, ENAME VARCHAR2(10), JOB VARCHAR2(9), MGR NUMBER(4), HIREDATE DATE, SAL NUMBER(7, 2), COMM NUMBER(7, 2), DEPTNO NUMBER(2) ); INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK', 7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20); INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30); INSERT INTO EMP VALUES (7521, 'WARD', 'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30); INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER', 7839, TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20); INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698, TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30); INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839, TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30); INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839, TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10); INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566, TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20); INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL, TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10); INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,

Members of the community have created other smart data types such as SmartInt or SmartDouble that provide the same concepts to those other data types. To standardize and simplify the creation of those types, CSLA .NET defines the ISmartField interface. This interface allows CSLA .NET to interact with any smart data type in a consistent manner: Public Interface ISmartField Property Text() As String ReadOnly Property IsEmpty() As Boolean End Interface As you can see, the interface enables both the concept of an empty value and the ability to convert the value into and out of a text representation. Creating a new data type, especially one that extends an existing type such as DateTime or Integer requires a lot of work. The goal is to have the new type work as much like the original as possible, which means overriding many (if not all) operators and providing support for type conversion and cast operations. I discuss some of these challenges in 16 when I cover the implementation of SmartDate.

ops$tkyte%ORA11GR2> select /* TAG */ substr( username, 1, 1 ) 2 from all_users au1 3 where rownum = 1; S S ops$tkyte%ORA11GR2> alter session set cursor_sharing=force; Session altered. ops$tkyte%ORA11GR2> select /* TAG */ substr( username, 1, 1 ) 2 from all_users au2 3 where rownum = 1; SUBSTR(USERNAME,1,1) -----------------------------S What happened there Why is the column reported by SQL*Plus suddenly so large for the second query, which is arguably the same query If we look at what the cursor sharing setting did for us, it (and something else) will become obvious: ops$tkyte%ORA11GR2> select sql_text from v$sql where sql_text like 'select /* TAG */ %'; SQL_TEXT ------------------------------------------------------------------------------select /* TAG */ substr( username, 1, 1 ) from all_users au1 where rownum = 1 select /* TAG */ substr( username, :"SYS_B_0", :"SYS_B_1" ) au2 where rownum = :"SYS_B_2" from all_users

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