.NET/Java PDF, Tiff, Barcode SDK Library

Figure 2-7. Add the project dialog. Select the Visual C# project type and the Class Library template. Add a reference to the System.Web assembly by right-clicking the References folder and choosing Add Reference, as shown in Figure 2-8.

val SQL: Expr<'a> -> 'a This function works on F# quotations. These are converted to LINQ Expression objects and passed to the underlying LINQ mechanism to produce SQL that is then executed on demand.

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Next, we see how using dbms_lob.writeappend can create LOBs of a length more than 32,760 bytes in PL/SQL: 12 13 14 15 16 for i in 1..3 loop dbms_lob.writeappend( l_clob, length(l_str_to_append), l_str_to_append ); end loop; Finally, we update the LOB column and commit the data:

Figure 2-8. The Add Reference dialog. Select the .NET tab and the System.Web.dll assembly. Add a class file to the project and name it GenericAbstractHttpApp. Here s the code you can provide for this new abstract base class: using System; using System.Web; using System.Web.Mail; namespace HttpAppReuse { public abstract class GenericAbstractHttpApp : HttpApplication { public GenericAbstractHttpApp() { this.Error += new EventHandler(GenericAbstractHttpApp_Error); this.BeginRequest += new EventHandler(GenericAbstractHttpApp_BeginRequest); } public abstract bool RequiresSSL { get; } private void GenericAbstractHttpApp_Error(object sender, EventArgs e) { HttpContext ctx = HttpContext.Current; Exception ex = this.Server.GetLastError(); MailMessage m = new MailMessage(); string sBody;

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Note When writing embedded queries using F# LinqToSql, you can use only a limited subset of operators

update clob_table set clob_col = l_clob where rownum <= 1; commit; end; /

to express your queries, in particular those defined in the F# LinqToSql library. Check the latest F# LINQ documentation for more details.

sBody = ex.Message + "\n"; sBody += ex.StackTrace; Exception ie = ex.InnerException; Exception last = ex; while (ie != null) { sBody += "\n\n--------------------------"; sBody += "\n" + ie.Message; sBody += "\n" + ie.StackTrace; last = ie; ie = ie.InnerException; } m.To = "YourEmail@YourDomain.com"; m.Subject = "Intertech Training Exception"; m.Body = sBody; m.From = "Exception@IntertechTraining.com"; SmtpMail.Send(m); Response.Redirect(String.Format ("/ErrorOccurred.aspx Message={0}", Server.UrlEncode(last.Message))); } void GenericAbstractHttpApp_BeginRequest(object sender, EventArgs e) { HttpContext ctx = HttpContext.Current; if (this.RequiresSSL) if (!ctx.Request.IsSecureConnection) ctx.Response.Redirect( Request.Url.ToString().Replace("http:", "https:")); } } } This class provides two pieces of functionality. The first is in the application s Error event. Any IIS application that uses this class as its base class for the global.asax e-mails any error that occurs to the recipient specified in the To line of the mail message. This includes the entire call stack of the error and the type and line number where the error occurred. The Error event trap then redirects to a generic error page. The second piece of functionality enforces that a site must be served over Secure Sockets Layer (SSL). This is where the abstract member becomes relevant. This is functionality you don t want to leverage from any site, only those that need to be served over a secure channel.

PL/SQL procedure successfully completed. Just as we wrote a LOB value of more than 32,000 in chunks, we can also read a CLOB of more than 32,000 bytes in PL/SQL. In the following snippet, we read the CLOB of 98,294 bytes we just created in chunks of 255 characters: benchmark@ORA10G> declare 2 l_read_buf varchar2(255); 3 l_amount_to_read binary_integer := 255; 4 l_clob clob; 5 l_offset number := 1; 6 begin 7 select clob_col 8 into l_clob 9 from clob_table; After selecting the CLOB in a variable, we read it in chunks of 255 bytes in a loop, as follows. We exit from the loop when the exception NO_DATA_FOUND indicates that there are no more bytes to read: 11 begin 12 loop 13 dbms_lob.read( l_clob, l_amount_to_read, 14 l_offset, l_read_buf ); 15 l_offset := l_offset + l_amount_to_read; 16 17 dbms_output.put_line( l_read_buf ); 18 end loop; 19 exception 20 when no_data_found then 21 null; 22 end; 23 end; 24 / A clob example*************************...(truncated to conserve space) That concludes our brief tour through internal LOBs in PL/SQL. I urge you to read PL/SQL Packages and Types Reference (10g Release 1) for more details on this very useful package. Next, we ll look at external LOBs in SQL and PL/SQL.

HOW LINQ APPEARS FROM F#