ASP.NET Web PDF Document Viewer/Editor Control Library

page size with the array script you generate, and chances are you won t use most of that data each time the page is sent to a user For some operations, shipping data for all possible user selections is just not an option A TreeView control is a good example There may be hundreds or thousands of nodes in a large TreeView You definitely don t want to ship all of the data for all of those nodes to the client when the client first requests the page This would cause a huge up-front performance hit, and negatively impact the usability of the application A postback for each click on the node is annoying too The page renders quickly but its performance thereafter is kludgey and slow (and probably just plain unusable) So it would be nice, in many circumstances, if another option existed.

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We use three statements in this class The first statement enables dbms_output, which is equivalent to set serveroutput on in SQL*Plus The second statement disables dbms_output in a similar way to how we do it in SQL*Plus using set serveroutput off The last statement displays the results of DBMS_OUTPUT using the Systemout method in Java private CallableStatement enable_stmt; private CallableStatement disable_stmt; private CallableStatement show_stmt; The constructor simply prepares the three statements we plan on executing Preparing a statement is a step that creates a statement with placeholders for us to bind input parameters and register output parameters The statement we prepare for SHOW is a block of code to return a string of dbms_output output public DbmsOutput( Connection conn ) throws SQLException { enable_stmt = connprepareCall( "begin dbms_outputenable(:1); end;" ); disable_stmt = connprepareCall( "begin dbms_outputdisable; end;" ); show_stmt = conn.

This is not: let f (x,y,z) = x + y + z Here are some of our guidelines for when to use currying and when not to use it: Use currying freely for rapid prototyping and scripting Saving keystrokes can be very useful in these situations Use currying when partial application of the function is highly likely to give a useful residual function (see 3) Use currying when partial application of the function is necessary to permit useful precomputation (see 8) Avoid using currying in vanilla NET APIs or APIs to be used from other NET languages When using currying, place arguments in order from the least varying to the most varying This will make partial application of the function more useful and lead to more compact code For example, Listmap is curried with the function argument first because a typical program usually applies List.

prepareCall( "declare " + " l_line varchar2(255); " + " l_done number; " + " l_buffer long; " + "begin " + " loop " + " exit when length(l_buffer)+255 > :1 OR l_done = 1; " + " dbms_outputget_line( l_line, l_done ); " + " l_buffer := l_buffer || l_line || chr(10); " + " end loop; " + " :2 := l_done; " + " :buffer := l_buffer; " +.

map to a handful of known function values but many different concrete list values Likewise, you saw in s 8 and 9 how recursive functions can be used to traverse tree structures These traversals often carry an environment The environment changes relatively rarely only when you traverse the subtrees of structures that bind variables For this reason, the environment is the first argument When using currying, consider the importance of the pipelining operator; for example, place function arguments first and object arguments last F# also uses currying for let-bound binary operators and combinators: let divmod n m = .. let map f x = .. let fold f z x = .. However, see s 6 and 8 for how to define operators as static members in types, which are not curried Recommendation: Use tuples for return values, arguments, and intermediate values.

Can you go back to the server and get just a little more data without having to rerender and resend all of the markup for the entire page This facility has been built into ASP NET 20, and it s the last scripting feature we ll examine The feature is called out-of-band callbacks, because it executes asynchronously on a worker thread of the web browser This is good, because the user interface stays responsive while the browser makes a request to the server in the background The callback is kicked off by an event on the client A user action can cause it button clicks, change events, mouse events, whatever The client-side script to launch the call to the server is automatically generated by a call to a method of the ClientScript object.

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