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When you use BFILEs, you will also be using an Oracle DIRECTORY object. The DIRECTORY object simply maps an operating system directory to a string or a name in the database (providing for portability; you refer to a string in your BFILEs, not an operating system specific file-naming convention). So, as a quick example, let s create a table with a BFILE column, create a DIRECTORY object, and insert a row referencing a file in the file system: ops$tkyte@ORA11GR2> create table t 2 ( id int primary key, 3 os_file bfile 4 ) 5 / Table created. ops$tkyte@ORA11GR2> create or replace directory my_dir as "/tmp/" 2 / Directory created. ops$tkyte@ORA11GR2> insert into t values ( 1, bfilename( "MY_DIR", "test.dbf" ) ); 1 row created. Now the BFILE can be treated as if it were a LOB because it is. For example: ops$tkyte@ORA11GR2> select dbms_lob.getlength(os_file) from t; DBMS_LOB.GETLENGTH(OS_FILE) --------------------------1056768 We can see the file pointed to is 1MB in size. Note that the use of MY_DIR in the INSERT statement was intentional. If we use mixed case or lowercase, we would get the following: ops$tkyte@ORA11GR2> update t set os_file = bfilename( "my_dir", "test.dbf" ); 1 row updated. ops$tkyte@ORA11GR2> select dbms_lob.getlength(os_file) from t; select dbms_lob.getlength(os_file) from t * ERROR at line 1: ORA-22285: non-existent directory or file for GETLENGTH operation ORA-06512: at "SYS.DBMS_LOB", line 566 This example points out that DIRECTORY objects in Oracle are identifiers, and identifiers are stored in uppercase by default. The BFILENAME built-in function accepts a string, and this string s case must match the case of the DIRECTORY object exactly as stored in the data dictionary. So, we must either use uppercase in the BFILENAME function or use quoted identifiers when creating the DIRECTORY object:

The following sections provide a brief description of all the keywords and operators that we will encounter as we explore C# in the coming chapters. Each item is described briefly, and details of where in the book you can find further information are provided. I have not listed all the keyword and operators just the ones that are commonly used and that are covered in this book. These sections are not intended to be read start to finish. I suggest you use these for reference when you know what it is you want to achieve but can t remember which keyword or operator you should use. Many of the keywords are accompanied by brief examples to jog your memory in just these circumstances. The keywords are grouped by category. Table 4-3 summarizes the keywords so you can turn find what you are looking for.

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A subclass of DataSourceProvider needs to override the BeginQuery() method, which data binding invokes when it needs the control to create or retrieve an object. This can happen in the following cases: When the WPF form is loaded and IsInitialLoadEnabled is True (the default) When a property of the data provider control is changed (via data binding or code) The BeginQuery() method must honor some properties from the base class. First, it must support the concept of deferred refresh, which allows the UI code to set many properties of the data provider control and have the query run only once after they ve all been set. The IsRefreshDeferred property on the base class controls this. Second, it must support the IsInitialLoadEnabled property. If this property is False, then the first time BeginQuery() is invoked, it must return without doing any work. Finally, the CslaDataProvider control supports an IsAsynchronous property, and if that is True, then the query is run on a background thread. Here s the code: Protected Overrides Sub BeginQuery() If Me.IsRefreshDeferred Then Return End If If _firstRun Then _firstRun = False If Not IsInitialLoadEnabled Then Return End If End If Dim request = New QueryRequest() request.ObjectType = _objectType request.FactoryMethod = _factoryMethod request.FactoryParameters = _factoryParameters request.ManageObjectLifetime = _manageLifetime If IsAsynchronous Then System.Threading.ThreadPool.QueueUserWorkItem(AddressOf DoQuery, request) Else DoQuery(request) End If End Sub

CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)

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