.NET/Java PDF, Tiff, Barcode SDK Library

Finally, we read and print the BLOB that contains our file contents, as shown in the following code. We use the dbms_lob.read() function to read the BLOB in chunks of 100 bytes (the length of the variable l_amount_to_read). Notice how we need to use utl_raw.cast_to_varchar2() to cast the contents of the buffer in order to see the text output in SQL*Plus. This is how you can see text data stored in BLOB in SQL*Plus. When there is no more data left, we get a NO_DATA_FOUND exception that we catch and ignore to end the program: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 dbms_output.put_line( 'blob contents -------' ); begin loop dbms_lob.read( l_blob, l_amount_to_read, l_offset, l_read_buf ); l_offset := l_offset + l_amount_to_read; -- output the line - note that we need to cast the -- binary data into varchar2 using the -- utl_raw.cast_to_varchar2 function. dbms_output.put_line( utl_raw.cast_to_varchar2(l_read_buf) ); end loop; exception when no_data_found then null; end; We then delete all rows from blob_table and insert the preceding BLOB value in it: 37 38 39 40 delete blob_table; insert into blob_table( x, id, blob_col ) values( 'blob loaded from text', 1, l_blob ); commit;

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Loading an existing XML document is straightforward; you can call the Load static method on either an XDocument or an XElement: let file name = Path.Combine(__YOUR_SOURCE_DIRECTORY__, name) XElement.Load (file "contacts.xml") Saving is just as easy, reusing doc from earlier: doc.Save (file "contacts2.xml") LinqToXML considers an XML document as a collection of XElement objects, each in a parent/child relationship. The root XElement s Parent property is null, even if it is embedded in an XDocument, which can simply be ignored as far as the data in the XML is concerned. XElement children can be obtained using the Elements() method, or its override, which expects an XName argument and returns all elements with a given name. let contacts = doc.Element(xname "contacts") // Get the first contact for elem in contacts.Elements() do printfn "Tag=%s, Value=%A" elem.Name.LocalName elem.Value

PL/SQL procedure successfully completed. The following code shows how to display the text data in a BLOB column in SQL*Plus using utl_raw.cast_to_varchar2 in a select statement: benchmark@ORA10G> select utl_raw.cast_to_varchar2( blob_col) blob_col 2 from blob_table; BLOB_COL ------------------------------This is a test. This is line number 2. This is line number 3. This is the final line.

Figure 2-10. The interface implementation Smart Tag Choose to Implement interface 'IHttpModule' and your class will look something like this: public class MyHttpModule : IHttpModule { public MyHttpModule() { } #region IHttpModule Members public void Dispose() { throw new NotImplementedException(); } public void Init(HttpApplication context) { throw new NotImplementedException(); } #endregion } Implementation is then pretty simple. Let s implement this module to intercept any request for a page with a CFM extension and rewrite the path to a like-named ASPX page. First add a private field to the class to squirrel away the reference to the application instance. Then set up a trap for the BeginRequest. That s when the check of the extension is made, and a corresponding rewrite of the path occurs. The finished class looks like this:

For the remainder of this chapter, we will discuss how to access and manipulate internal LOBs using the JDBC API. Figure 12-1 is a class diagram that shows the classes and interfaces involved.

Queries on XML are often expressed using the XPath query language, which we don t cover in detail in this book but which is supported by the types in the System.Xml namespace. As a good alternative to XPath, you can use the standard sequence operators to perform queries over XML data. The following example uses the helper functions and the file contacts2.xml created in the previous section: open System open System.Xml.Linq let elem (e: XElement) s let elemv e s = e.Element(xname s) = (elem e s).Value