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A LOB instance that is null does not have a locator. Before you can pass a LOB instance to any LOB API routine (PL/SQL or Java), the instance must contain a locator. You insert an empty locator by using the SQL function empty_clob() for CLOB columns and the SQL function empty_blob() for BLOB columns: benchmark@ORA10G> insert into clob_table( clob_col) values ( empty_clob() ); 1 row created. You can also specify the CLOB column to have an empty value as a default value to ensure that you will always have API-friendly empty CLOB values in your tables.

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This C# source file contains classes for each data table in the Northwind database, and the relationships between those tables are strongly typed..

A temporary LOB is a BLOB, CLOB, or NCLOB that is accessible and persists only within the application scope in which it is declared. A temporary LOB does not exist in database tables and can be created explicitly as follows (setting CACHE to true means temporary LOBs are eligible to be read into the Oracle data buffer cache): benchmark@ORA10G> declare 2 l_clob clob; 3 begin 4 dbms_lob.createtemporary( lob_loc => l_clob, 5 cache => true ); 6 end; 7 / PL/SQL procedure successfully completed. Many SQL functions return temporary LOBs silently. You can also create temporary LOBs from JDBC, as you ll see later. Let s now examine a quirk that may confuse you when inserting large data into a CLOB column from PL/SQL versus using pure SQL. We use our familiar clob_table in the examples that follow. Note that when we insert data directly using SQL, we are unable to insert data more than 4,000 bytes (the limit of varchar2 in SQL), regardless of the actual data size; Oracle silently truncates the column to 4,000 bytes. benchmark@ORA10G> insert into clob_table( x, id, clob_col) 2 values ( 'Insert from SQL', 1, rpad( '*',32000, '*' ) ); 1 row created. We insert a value of length 32,000 bytes, but verify the actual length of CLOB column inserted to be of 4,000 bytes by selecting the length of the CLOB value as follows: benchmark@ORA10G> select x "Description", id, 2 dbms_lob.getlength( clob_col ) "Length of clob" 3 from clob_table;

There s no runtime difference between these techniques: one relies on a naming convention and magic behind the scenes, and the other clearly documents the existence of the event trap and allows you to use method names of your own choosing. You can use the following Web Form to exercise your HttpApplication derived class. Here s the markup for Default.aspx: <%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" %> And here s the code from Default.aspx.cs: public partial class Default_aspx { protected override void OnInit(EventArgs e) { this.Load +=new EventHandler(Default_aspx_Load); this.PreRender +=new EventHandler(Default_aspx_PreRender); } void Default_aspx_Load(object sender, EventArgs e) { Response.Write(MyImpl.SomeStaic + "<BR>"); } void Default_aspx_PreRender(object sender, EventArgs e) { Response.Write("<b>Page Handler Fired</b><BR>"); } } Notice in the ASPX file that all of the markup has been removed. You should do this whenever you use Response.Write, because using this method pre-empts the page-rendering process. Requesting the page produces the results shown in Figure 2-5. The first two lines are output during preprocessing, before the Default_aspx type has executed. The last two lines are output by the page processing, and the first of the two here accesses and outputs the static field declared on your HttpApplication class. Note that this value is shared across pages and across users. A change made for one user will be reflected for all users. Any modifications to it must be synchronized to be thread safe. If the type requires more complex construction semantics, you can add a static constructor to your derived type, as in this example: public static DataSet StateList; static MyImpl() { StateList = new DataSet(); StateList.ReadXml("http://www.IntertechTraining.com/StateList.xml"); }

Tip Regardless of your choice to work with SQL explicitly or implicitly, in applied database scenarios you will frequently want to separate data definitions entirely from application code. DDL scripts that create schemas, tables, triggers, and views and scripts that create seed data should be managed as separate artifacts that are executed prior to application deployment.