Simple .NET/ASP.NET PDF document editor web control SDK

This chapter focuses on some of the more subtle communication that occurs between the web server and the web browser in ASP.NET request processing. We ll look specifically at the ViewState, enhancements to the scripting model that ease the generation of client-side JavaScript, and an amazing new feature that allows for out-of-band asynchronous callbacks from a web browser to the web server. This set of features focuses on how to maximize the power and flexibility you have when creating applications within the confines of a web browser. The capabilities afforded by this set of features are seldom fully utilized. The callback feature is especially important, as it is cross-browser-compatible and has the potential to take web application development to the next level by giving the developer the ability to do a partial page refresh, creating a more responsive and usable interface for the user.

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The following restrictions exist when you are trying to create an updatable ResultSet: The query can select from only a single table and cannot contain any join operations In addition, for inserts to be feasible, the query must select all non-nullable columns and all columns that don t have a default value (unless a trigger or a default column value kicks in and populates the column value even if you don t explicitly specify it) This clearly is a considerable restriction and one of the main reasons I m not a fan of this feature The query can t use select * However, you can easily work around this restriction by specifying table aliases Thus, select * from emp won t work, but select e* from emp e will give you an updatable result set The query must select table columns only.

b.Bind(expr,(fun pat -> cexpr )) b.Let(expr,(fun pat -> cexpr )) b.Using(expr,(fun pat -> cexpr )) b.Bind(expr,(fun x -> b.Using(x,fun pat -> cexpr ))) b.Bind(expr,(fun () -> cexpr )) b.Let(expr,(fun () -> cexpr )) b.For(expr,(fun pat -> cexpr )) b.While((fun () -> expr),b.Delay(fun () -> cexpr )) if expr then cexpr1 else cexpr2 if expr then cexpr else b.Zero() v.Combine( cexpr1 , b.Delay(fun () -> cexpr2 )) b.Return(expr) expr

It can t select derived columns or aggregates such as the sum, count, or max of a set of columns For an insert to work, you can t have an order by in the query for which the updateable result set is created (This isn t noted in the official JDBC documentation) If you try to perform an insert on a result set whose select statement has an order by clause, you ll get this SQLException: javasqlSQLException: ORA-01732: data manipulation operation not legal on this view To create a scroll-sensitive result set A query cannot use select * Once again, you can easily work around this by specifying table aliases A query can select from only a single table These limitations mean that the scrollability and updatability features, as implemented currently, are useful only in very simple queries.

ET is complex Not so much in the same way that COM is complex Not in the way that makes you want to cry as you realize you re going to have to scrub the registry for references to an old version of a COM server again Not in the way that gives you nightmares about ghoulish GUIDs taunting you from a misplaced type library No, NET s complexity is based more on its sheer size and scale There are more than 3,000 types in the Framework class library, and these types are designed to do just about anything The major learning curve to becoming productive in the NET Framework is not the language, regardless of your language of choice (although moving from VBScript to VB NET Web Forms has been challenging for more than a few); it s the Framework class library.

Note If you ve never seen F# workflows or Haskell monads before, then you may find workflows take a

The updatability feature in particular does not add any value over the regular way of doing updates using SQL statements I have never found a need to use this feature..

bit of getting used to, since they give you a way to write computations that may behave and execute quite differently than normal programs.