Parameter Sniffing and Reporting service through Visual studio

by Deepak Dhakal 16. June 2009 11:20

Today I had a very bad day. My friend left me a job that he estimated for 2 hours and Now I need to finish that ..There is no chance that i can write multiple pages sql Stored procedures /query and create report in 2 hours ..

It is going to take me at least 15 hours for everything .. Ok that is not the point .. the point .. I spent 5 hours to write all the query .. tested in Sql query manager and ran great ... Thought I was really good .. created a report layout .. added few dataset and ran the report using VS 2005 IDE .. Now the drama begins .. It took 5-10 mins to render report by VS 2005. I went to sql server machine.. checked for task manager .. CPU uses was more than 50% for that 10 mins time .WOW .. When I ran the same query in query manager .. it took less than 5 seconds .. I was upset .. restarted VS .. restarted computer .. nothing happened .. recompiled code .. redeployed .. Nothing ..Nothing at all.. I googled about it .. I am not only one.. If u have same problem ..

Google about "Parameter Sniffing " ..U will see many article about it .. In short the solution was: Suppose I have :

create proc newProc { @name varchar(200) }

as select name from nametable where name=@name

.. go

everytime u call it from outside with even NULL value or some value not equal to varchar(200) SQl server tried to create a brand new execution plan ..

and it takes forever to run the script if u have pretty complex sql..

Sol Very simple .

create proc newProc

{ @name varchar(200) }

@declare @newName varchar(200)

set @newname=@name as

select name from nametable where name=@newname .. go

done !! SQL just ignores to create execution plan and runs the last used plan ..

Ok ..so lesson of today:

There are lot of thing u dont know about .



So You clicked mouse outside your target .. How to detect it - Flex

by Deepak Dhakal 11. June 2009 09:31

In ActionScript3 event driven programming plays a major part with mouse or key pressed and even a text field having events associated with them. Events indicate action e.g. mouse press corresponds to “mouse down” event and vice versa is “mouse up” event.

To check if mouse release (mouseUp -Event.MOUSE_UP)) has happened on the target object on which mouse down - Event.MOUSE_DOWN took place or a “mouse up outside “event when mouse up has not happened on the target object; there is no predefined event with AS3 unlike its earlier versions that had “onReleaseOutside event”.

To resolve this, we need to add stage event handler for mouse up in mouse down event handler. By adding stage event handler for mouse up will detect any global mouse up event. Hence it will check if the event associates the target object that has mouse down event earlier or it was a mouse up outside event not related with the target object.

Package {
Import flash.display.DisplayObject;
import flash.events.*;

public var child: DisplayObject = new DisplayObject ();
public function childdown(event:MouseEvent):void
// mouse up event happens only when there is mouse down
trace("child mouse down");

Public function childUpOutside (event:MouseEvent):void
if (event.target != child)
trace("child mouse up outside");
stage.removeEventListener(MouseEvent.MOUSE_UP, childUpOutside);




Flex: Mouse Move Event and Slow Rendering

by Deepak Dhakal 4. June 2009 11:12

In flex, if you using Mouse move event to redraw anything .. You might have experienced very slow rendering .


this.addEventListener(MouseEvent.MOUSE_MOVE, redraw);


    public function redraw(anything:Object=null):void{
            //draw something here
                this.graphics.lineStyle(3, 0x000000);
                this.graphics.moveTo(startPoint.x, startPoint.y);
                this.graphics.lineTo(endPoint.x, endPoint.y);
                this.scaleTextInput.x = centerPoint.x;
                this.scaleTextInput.y = centerPoint.y;

The Above code results very slow rendering ...


Use Event.ENTER_FRAME event instead? Although more resource intensive than the mouse move event, you should receive considerably more updates per second, allowing the mouse to appear more responsive to the user:


this.addEventListener(Event.ENTER_FRAME, redraw);   instead of 

this.addEventListener(MouseEvent.MOUSE_MOVE, redraw);

and You are good to go ..Happy Flexing




Flex Tooltip Animation

by Deepak Dhakal 3. June 2009 06:56

So you want to show some animation to show tooltip when U hover over something ? Here is an example that shows a rotating tooltip

Change as you want ..


<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/09/04/adding-animations-and-effects-to-flex-tool-tips/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

import mx.managers.ToolTipManager;

private function init():void {
ToolTipManager.hideDelay = 2000;
ToolTipManager.showEffect = rotate;
ToolTipManager.hideEffect = zoom;

@font-face {
src: url("./fonts/arial.ttf");
fontFamily: "ArialEmbedded";

ToolTip {
fontFamily: ArialEmbedded;

<mx:Rotate id="rotate" />
<mx:Zoom id="zoom" />

<mx:Button label="Roll over me to see magic"
toolTip="Sorry No Magic..." />




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