Download this free album now!

A huge thanks goes out to creator of this compilation Joseph Labrecque.  Thank you for making this compilation and thank you for letting The Compilers submit our song ‘Sleep Tick v2′.  Be sure to read Joseph’s comments about the compilation he so graciously put out for all to enjoy.

I spoke at the last 360|Flex in San Jose, but I’m already more excited for the DC conference, and here’s why.

1. I’m speaking about the most exciting part of the Flash Platform, AIR2
2. Jesse vs. Jesse ( Flash vs Flex throwdown )
3. It’s in Washington DC
4. My band The Compilers will be giving a lunch talk, as well as playing live at one of the parties
5. There is talk of Duanne Nickull’s band 22nd Century playing ( hopefully Sean ‘the flex guy’ too )
6. Doug McCune is giving the opening Keynote speech on Monday
7. I get to hang out with the Flex community

If you haven’t been to a 360 Flex conference yet I highly recommend it.  If you still need help deciding, here are a few conference questions for you.

1. Do you currently work with or have any interest in Adobe Flex?
2. Have you attended a 360 Flex conference yet?
3. Do you want to meet the community loudmouths you’re already following on Twitter?
4. Have you seen who is speaking at 360 Flex DC?
5. Have you ever heard The Compilers play live?
6. Are you still reading this blog post?

The last 360 Flex I spoke at was in San Jose and it rocked.  The city of San Jose bored me to tears, but I felt like I was living inside my twitter feed for three days.  My presentation was on the final day of 360 Flex, so I spent most of the conference preparing, and sitting in a few sessions here and there.  I spent almost half of my time in San Jose working and still met 10-15 of my twitter buddies, not to mention all the new contacts I met.  In a nutshell, if you attend a 360 Flex conference, you will meet the community.  In fact, you’d have to try pretty hard to not meet the Flex community.

If this sounds up your alley, go ahead and register to take advantage of the early adopter ticket price of $450.  I’m not sure when the ticket price will go up to $599, but I know it will so act fast.  If you make it to DC, be sure to find me and introduce yourself.  I promise it will be a good time.

Early adopter price $450	360|Flex Information ABOUT SCHEDULE SPEAKERS REGISTER

DataBinding: ‘MyApp.vo.customVO’ does not contain a property with the name ‘Name’

I was stumped because my custom VO class did in fact have a public property called Name.  After many trials and tribulations I figured out that .NET didn’t like how I structured my custom class.

Here is what my original custom class looked like.

namespace MyApp.vo
{
    public class customVO
    {
        public Int32 id  = 0;
        public DateTime time  = new DateTime();
        public string Name  = string.Empty;
        public string DeviceType  = string.Empty;
        public string ObjectIDs  = string.Empty;
    }
}

Luckily I have JetBrains ReSharper installed, and it suggested using C#’s Auto-Implemented properties. This is the one thing I hadn’t thought about trying, and it ended up being the fix! My new custom VO class now looks like this.

namespace MyApp.vo
{
    public class customVO
    {
        public Int32 id { get; set; }
        public DateTime time { get; set; }
        public string DeviceType { get; set; }
        public string ObjectIDs { get; set; }
        public string Name { get; set; }
    }
}

So if you find yourself running into this error while trying to DataBind a collection of custom classes to a ListBox or similar control, have a look at your custom class and see if you can convert it over to using auto-implement properties as well.

Now I’m not suggesting this is the only way to DataBind a List of custom classes to a ListBox, but it solved my problem and let me do direct databinding from my service call without having to do any pre-processing on my list.

Hope this helps someone else.

Firing up my ASP.NET application gives me the error message :

The WebResource.axd handler must be registered in the configuration to process this request

WebResource.axd handler must be registered

Obviously all I could think is WTF?!?!? since this application worked on Friday and now it is broken.  The first thing I want to point out is that in my situation, the suggested solution of mapping WebResource.axd in the httpHandlers section of my web.config did not help this problem.  After some googling I cam across this post on the IIS.NET forums which put me on the right track.  You can read the details there if you want a good background on MS’ response and other users running CF and ASP.NET on the same box.

I’m happy to say I have three workarounds for this issue.  Hopefully these will help you as well.

1. Change your AppPool to run in Classic Mode

1. In inetmgr, put your web application into it’s own Application Pool ( unless it’s already in it’s own pool )
2. Change that AppPool’s Managed pipeline mode to “Classic”
3. You should be good to go

Classic mode is for compatibility ( think IIS6 )

2. Stop using ASP Validation controls

All ASP.NET Validation controls are hosted by WebResource.axd.  If you stop using ASP Validator controls, the server will stop asking for WebResource.axd.

Removing ASP Validator controls should remove this error

3. Remove Coldfusion handler mappings from your ASP.NET site

If your ASP.NET app isn’t using Coldfusion, I would suggest doing this as your solution.  Even if you do need Coldfusion in your ASP.NET app, you could still host your CF app in it’s own Virtual Directory and request if via ASP.NET.

1. Open inetmgr
2. Select your web app on the left ( under Default Web Site )
3. In Features View on the right, double click Handler Mappings
4. Sort your Handler Mappings by Name, and remove all entries titled “AboMapperCustom-*”
5. Now your ASP.NET should work like a champ.

IIS7 Handler Mappings

Coldfusion9 Handler Mappings

Monday WTF solved.  Now to get back to pushing buttons.

Running this query

SELECT * INTO #myTableVar FROM YourTable

Gives you a new table variable named myTableVar. Table variables are scoped to the active connection, so running this will work.

// make table var
SELECT * INTO #myTableVar FROM YourTable
// show me the data
SELECT * FROM #myTableVar
// you can drop it if you wish
DROP TABLE #myTableVar

However, let’s say you have an aspx page or a sproc that runs this query.

SELECT * INTO #myTableVar FROM YourTable

You can not access myTableVar in a separate connection to the database because as soon as the first query’s connection closes, myTableVar gets dropped.   Here are a few other scenarios that also demonstrate the scoping of a table variable.

-- FAILS
EXEC ('SELECT * INTO #tmp FROM MyTable;');
-- #tmp does not exist
SELECT * FROM #tmp

Table variable #tmp lives inside of EXEC

Here we see that the table variable #tmp only lives for the life of the statement inside of EXEC. The second SELECT * calls is outside of the EXEC statement.

-- #tmp2 works inside of EXEC statement
EXEC ('SELECT * INTO #tmp2 FROM MyTable; SELECT * FROM #tmp2');

What happens in EXEC, stays in EXEC

Here #tmp2 works because it’s being used inside of the EXEC statement. This is worth knowing if you work with dynamic sql statements and exec.

-- works!
SELECT * INTO #tmp FROM MyTable;
-- #tmp exists
SELECT * FROM #tmp

typical sample of using mssql table variable

This is a typical example that you may use inside a sproc, trigger, script, etc. Both sql calls live in the same space, so #tmp exists.

Here are the tables from my schema

Here is a basic SQL statement I could fire to retrieve my user videos.

select  *
from    video v, user_videos uv
where   v.vid = uv.vid
and     uv.uid = 2

Here is how you would run the same query using .net’s LINQ to SQL.

// create DB connection
var db = new DBCONN();
// run query
List<video> uvids = (
    from c in db.video
    join o in db.user_videos
    on c.vid equals o.vid
    where o.uid == 2
    select c
).ToList();

This query differs slightly from the screenshot below because I used it in a WCF Service.

The variable DBCONN is my database connection that I established when mapping my DB.  If you are not familiar with how to set this up, use the Visual Studio’s “Add the ADO.NET Entity Data Model” wizard.  With your .net project open, right click your project, left click on “Add the ADO.NET Entity Data Model”.  This wizard will walk you through setting up everything you need to setup your DB model file ( edmx ), as well as setting up your database connection and saving it in web.config.

Jesse Liberty did a simple tutorial that uses this wizard in a WCF service application.

I hope this helps somebody out.

Jun Heider and myself will be talking to the 360|Flex guys tomorrow about our session.  It’s actually going to be a back-to-back mega session comparing the latest and greatest on both the Flash Platform and the Silverlight Platform.

Come check it out and feel free to ask questions…although for the good stuff you’ll have to wait until our talks. 

Here’s the full details: http://www.360flex.com/blog/2010/02/360flex-speaker-chat-eric-fickes-and-jun-heider/

I hope to see you online tomorrow or at 360 Flex in March.

I'm speaking at 360 Flex 2010

After finishing this post I ran into all sorts of other strange issues and restarted using a Web Appliction instead of a plain old Website.  Between IntelliSense not showing any classes, to project reference issues, I couldn’t figured it out in time.  I’m sure there’s a way, I just had to move on.  So maybe this ramble below will be helpful for someone.

Just ran into something quirky with Visual Studio 2008′s new ADO.NET Entity Data Model wizard.  While working on an ASP.NET 3.5 website ( not a codebehind web application ) I was trying to get the ADO.NET Entity Data model wizard to work with MySQL and ran into a probable Visual Studio bug.  To sum up the issue, if you are going to add a new edmx to your project, do NOT save it to the App_Code folder initially.  Put it in your root folder, compile your project, then move the edmx where you’d like.

Assuming you’ve already created your ASP.NET Website project, here’s how you reproduce this issue.

Right click your project and left click ‘Add New Item’

Add New Item

Select ADO.NET Entity Data Model, name it, select your language of preference

ADO.NET Entity Data Model

Click Yes to the ‘Store in App_Code’ prompt

Place file in 'App_Code' folder

Complete the new Entity Data Model wizard

See this tutorial if you have not done this before

Compile project after completing wizard

Invalid token 'void' in class, struct, or interface member declaration

At this point your project should have a new.edmx file located inside of the App_Code folder, but the project won’t build without failing.  If you are stuck in this predicament, follow this workaround.

Move .edmx to root folder and rebuild

WORKAROUND : move edmx to root folder, then recompile

After moving your edmx file to the root folder you should be able to compile without problem.  Assuming this solves your problem, you should be able to move your edmx file to the App_Code folder without problem.  Seems like an initial compile problem.

Select a random value using a table variable

-- var to hold random integer
declare @field_val int

-- create table var to hold value range [ 0, 512, 1024, 2048, 4096 ]
-- inserting the first value sets the structure for the table variable
SELECT 0 AS 'num'
INTO #temp

-- insert data into table var
INSERT INTO #temp VALUES ( 512 )
INSERT INTO #temp VALUES ( 1024 )
INSERT INTO #temp VALUES ( 2048 )
INSERT INTO #temp VALUES ( 4096 )

-- assign random value
SELECT TOP 1 @field_val = num FROM #temp ORDER BY NEWID()

-- show value
SELECT @field_val

-- drop the table variable
DROP TABLE #temp

Select a random value using a CTE

-- define our data table
WITH data( car )
AS
(
	-- UNION together our range of values
	SELECT 'audi' AS 'car'
	UNION
	SELECT 'bmw' AS 'car'
	UNION
	SELECT 'infinity' AS 'car'
	UNION
	SELECT 'lexus' AS 'car'
	UNION
	SELECT 'porsche' AS 'car'
)
-- select a random value
SELECT TOP 1 car FROM data
ORDER BY NEWID()

Both of these techniques can be used with numbers or text. Just be sure to mind your quotes, and variable datatypes.  Being able to pick a random value in data generation scripts has proven very useful.  I hope this helps somebody else out as well.

Recently I was working on a medical website and was tasked with building a doctor directory page that had to pull data from three related tables.  For the viewers at home, here is a simplified view of my tables.

Doctors, Practices, and Locations oh my

The first version of the page was easy to whip up because we were only showing primary location address which lives in the practices table.  ( NOTE : The diagram above was dumbed down to support this post ).  When the request came in to show all locations for each doctor’s practice, that’s when I had to put on my wizard hat and get tricky.

After some thinking I came up with two options for adding all locations for each doctor row :

1. Build a second locations query for each doctor in the first query, then use code to merge the data together
2. Update the first query to include all necessary data, then use code to merge the data into a loopable structure

Being a SQL junky, I decided to take the second route so I’m still only hitting the database once.  In the first version of this page, we always had one row per doctor and didn’t have to do any post processing of the data prior to sending to the page.  However, when the locations table gets added to our sql query, all of the doctor data gets duplicated for each location they are associated with, making the dataset look like this.

When joining the third table, the first two get duplicated

Now that we’ve got all the data, you’ll notice that the doctor information gets duplicated.  This is where I built a cffunction to convert this query into a structure of individual doctors, each having an array of locations.  I used the doctor’s full name and id as the structure keys.  Great, now I can just loop through my new structure of doctors, then loop through each doctor.location array to draw the updated html table.  That is the goal here, but we’re not ready just yet.

If you’ve ever tried to loop over a Structure in Coldfusion, you’ve probably noticed controlling the order of your data coming back can be tricky.  Here’s an example of what I’m talking about when looping through a structure.

Looping through a coldfusion structure can be a challenge

To get around this random order of looping through a structure, I did two steps prior to building the updated html table.

	// UPDATE : extract key list ( DR full names ) so
	// you can sort the physicians my last name
	dr_list = StructKeyList( providers_struct );
	dr_list = ListSort( dr_list, "textnocase" );

This gives me an alphabetized list of all doctors inside my structure, which I convert to an array then loop through.  I know have a sorted loop that can pick all necessary doctor data out of my structure on command.  This solution took a little bit of time to figure, but wasn’t too bad.  After thinking about all the work needed to make this update, I wondered if using Coldfusion9′s Hibernate ORM would have made this update any easier.

Porting SQL to ORM

The first step in setting up  Coldfusion9′s ORM for this code is to enable the ORM in the application.

At the top of my Application.cfc I added the following lines.

	<cfscript>
		// enable ORM
		this.ormenabled = true;

		// my datasource name, setup in the CFAdmin
		this.datasource = "mysql-test";

		// the folder in my app where the cfc mapping files are location
		this.ormsettings.cfclocation = "mappings";

		// this wasn't setup automatically for me
		this.ormsettings.dialect = "MySQL";
	</cfscript>

If you haven’t setup ORM in your Coldfusion9 application before, be sure to bookmark this livedoc page on configuring ORM.  It will give you all the lowdown on all the fancy ORM bells and whistles.

After ORM is enabled, it was time to create my Hibernate mapping files for each of the database tables involved in this code.  For convenience sake, I went the CFC route, and only mapped the columns required for this example.  There are a number of ways to define ORM mappings, refer to this livedocs page to find out more. Here are my three hibernate mapping cfcs.

doctor.cfc

<cfcomponent persistent="true" entityname="Doctor" table="providers">
    <cfproperty name="id" column="provider_id" generator="increment">

    <!--- one to many relationship Doctor.practice = Practice --->
    <cfproperty name="practice" fieldtype="one-to-one" cfc="PRACTICE" fkcolumn="practice_id">

    <cfproperty name="PracticeId" column="practice_id" insert="false" update="false">

    <cfproperty name="FirstName" column="first_name">
    <cfproperty name="LastName" column="last_name">
    <cfproperty name="status" column="status">
    <cfproperty name="is_midlevel" column="is_midlevel">
</cfcomponent>

practice.cfc

<cfcomponent persistent="true" entityname="Practice" table="practices">
	<!--- tie this column back to Doctor.practice_id --->
	<cfproperty name="id" column="practice_id" fieldtype="id" generator="foreign" params="{property='Doctor'}">

	<!--- Relate locations to this practice via Locations.practice_id and Locations.active = 1 --->
        <cfproperty name="locations" type="array" fieldtype="one-to-many" cfc="Location" fkcolumn="practice_id" params="{property='Location'}" where="active = 1">

    <cfproperty name="name" column="practice_name">
    <cfproperty name="active" column="active">
</cfcomponent>

location.cfc

<cfcomponent persistent="true" entityname="Location" table="locations">
	<cfproperty name="id" column="location_id" fieldtype="id">

	<cfproperty name="practice_id" column="practice_id">

    <cfproperty name="address1" column="address1">
    <cfproperty name="address2" column="address2">
    <cfproperty name="city" column="city">
    <cfproperty name="state" column="state">
    <cfproperty name="zipcode" column="zipcode">
    <cfproperty name="phone" column="phone">
    <cfproperty name="active" column="active">
</cfcomponent>

At this point we have three ORM entities that are mapped to the three database tables. If you look closely, you’ll notice that relationships have also been defined for doctors to practice, and practice to locations.  Setting up the relationships at the mapping level takes care of physically joining the three tables together via sql.  Also, while it’s pretty straight forward reading a blog with working code, I’m not going to pretend I got these relationships setup first try.  It’s simple relating two tables together, but finding the right combination for doctror > practice > locations was tricky.  I did a lot of this to figure this part out.

<cfscript>
// load doctors
dr_list = ORMExecuteQuery( "FROM Doctor WHERE status = 'Active' AND provider_id = 1" );
// load a practice
// practice = ORMExecuteQuery( "FROM Practice WHERE practice_id = 1" );
// load a location
// location = ORMExecuteQuery( "FROM Location" );
</cfscript>

<cfdump var="#dr_list#" />
<cfabort />

You can find out more about defining ORM relationships on this livedocs page.

With the hard stuff out of the way, we’re down to two steps.  First it’s time to port my cfquery that grabs the data, and the cffunction that converts the query into our loopable doctor structure.  Are you ready for this?

dr_list = ORMExecuteQuery( "from Doctor WHERE status = 'Active' AND is_midlevel = 0 ORDER BY last_name, first_name" );

To give you the full idea of how much code was shrunk down to a single line, here are the two cffunctions used to query and massage the data into a useable structure.

	<!--- Retrieve listing of all active providers in the app  --->
    <cffunction name="getAllActiveProviders" access="public" returntype="struct">

		<cfquery name="providers_qry" DATASOURCE="#request.dsn#" USERNAME="#request.dbuser#" PASSWORD="#request.dbpswd#">
            SELECT	DISTINCT

					p.provider_id,
            		CONCAT( p.first_name, ' ', p.last_name ) AS 'full_name',
                    p.first_name,
                    p.last_name,

    	            p2.practice_name,

					l.address1,
                    l.address2,
                    l.city,
                    l.state,
                    l.zipcode,
                    l.phone

            FROM	providers p, practices p2

            LEFT OUTER JOIN locations l
            ON p2.practice_id = l.practice_id AND l.active = 1

            WHERE	p.status = 'Active'
            AND		p.practice_id = p2.practice_id
            AND		is_midlevel = 0

            ORDER BY	p.last_name, p.first_name
        </cfquery>

		<!--- return a translated structure --->
		<cfreturn providersQryToStruct( providers_qry ) />

    </cffunction>

	<!--- Translates the providers query into a Struct that has a row per doctor, each containing an Array for location(s) --->
	<cffunction name="providersQryToStruct" access="public" returntype="struct">

    	<cfargument name="providers_qry" type="query" required="yes">

		<cfscript>
		this_dr = "";
		last_dr = "";
		// array of provider arrays
		providers_struct = StructNew();

		// loop through qry and flatten into single row with Location = Array
		// The key to this qry is provider_name+provider_id
		for( xx = 1; xx <= providers_qry.RecordCount; xx++ )
		{
			// set key to this row [ LAST_NAME+FIRST_NAME+PROVIDER_ID ]
			this_dr = providers_qry.LAST_NAME[ xx ] & providers_qry.FIRST_NAME[ xx ] & providers_qry.PROVIDER_ID[ xx ];

			// clean up DR name
			this_dr = Replace( this_dr, " ", "" );
			this_dr = Replace( this_dr, ",", "" );
			this_dr = Replace( this_dr, ".", "" );

			// got same doctor?
			if( this_dr != last_dr )
			{
				// append to array
				provider = StructNew();
				// FILL UP PROVIDER
				provider['full_name'] = providers_qry["full_name"][ xx ];
				provider['practice_name'] = providers_qry['practice_name'][ xx ];

				// location array
				provider['location'] = ArrayNew(1);

				// add first location
				loc = StructNew();
				loc['address1']	 = providers_qry['address1'][ xx ];
				loc['address2']	 = providers_qry['address2'][ xx ];
				loc['city']		 = providers_qry['city'][ xx ];
				loc['state']	 = providers_qry['state'][ xx ];
				loc['zipcode']	 = providers_qry['zipcode'][ xx ];
				loc['phone']	 = providers_qry['phone'][ xx ];

				// add location struct to array
				ArrayAppend( provider['location'], loc );

				// Add to master struct
				providers_struct[ this_dr ] = provider;
			}
			else
			{
				// add first location
				loc = StructNew();
				loc['address1']	 = providers_qry['address1'][ xx ];
				loc['address2']	 = providers_qry['address2'][ xx ];
				loc['city']		 = providers_qry['city'][ xx ];
				loc['state']	 = providers_qry['state'][ xx ];
				loc['zipcode']	 = providers_qry['zipcode'][ xx ];
				loc['phone']	 = providers_qry['phone'][ xx ];

				// Append to this DR's location array
				ArrayAppend( providers_struct[ this_dr ]['location'], loc );
			}

			// store this_dr in last_dr for next iteration
			last_dr = this_dr;
		}

		return providers_struct;
        </cfscript>

    </cffunction>

After going through the brain fry of figuring out ORM relationships, replacing over one hundred lines of code with only a single line really made my day. Now it was time for the final step, porting the cfml that draws the html table into using the ORM collection instead.
The porting of the cfml that draws the doctor table was a piece of cake. The updates were so easy it was almost not worth showing, but I’m including just to complete the picture.

The original sql loop code

    <!--- use dr_list as sorted list. use each DR key to pick out data from providers_struct --->
    <cfloop list="#dr_list#" index="xx">
    <tr>

        <td>#providers_struct[ xx ]['full_name']#</td>

        <td>#providers_struct[ xx ]['practice_name']#</td>

        <td>
        <!--- loop through array of location structures --->
        <cfloop from="1" to="#ArrayLen( providers_struct[ xx ]['location'] )#" index="yy">
            <address>
            <cfset loc = #providers_struct[ xx ]['location'][ yy ]#>
            <li>#loc.address1#, #loc.address2#
            #loc.city#, #loc.state# #loc.zipcode#
            <br />
            <b>#loc.phone#</b>
            </li>
            </address>
        </cfloop>
        </td>

    </tr>
    </cfloop>

The new ORM loop code

	<!--- loop through parent query --->
    <cfloop array="#dr_list#" index="xx">
    <tr>

    	<!--- retrieve properties using ORM's getProperty() syntax --->
        <td>#xx.getFirstName()# #xx.getLastName()#</td>

        <td>#xx.getPractice().getName()#</td>

        <td>
		<!--- loop through locations collection Doctor > Practice > Location(s)  --->
        <cfloop array="#xx.getPractice().getLocations()#" index="loc">

            <address>
                <li>#loc.getAddress1()#, #loc.getAddress2()#
                #loc.getCity()#, #loc.getState()# #loc.getZipcode()#
                <br />
                <b>#loc.getPhone()#</b>
                </li>
            </address>

        </cfloop>
        </td>

    </tr>
    </cfloop>

A few things I’d like to point out in the new ORM loop code

1. ORMExecuteQuery returned a data collection that I can loop through without post-processing
2. When retrieving object properties, use the getPropertyName() syntax.  EX : doctor.getFirstName() instead of doctor.FirstName
3. Practice.locations was declared as an Array collection, but you could use Structure as well.
4. To get the ORMExecuteQuery record count, use ArrayLen.

Did ORM make this easier?

I’d say yes it did.  Mapping my tables via code, including the relationships, really saved time writing SQL.  Funny thing, while I was porting this over, I actually found a few data and code bugs in the home grown solution that I didn’t catch before.  Once the dust had settled I still had one difference in the home grown versus ORM code, and that turned out to be duplicated location rows.

The other thing that I noticed thanks to our good friend cfdump, is all the extra functionality that comes along with the objects returned from ORM.  On top of having a populated data object, you also have magical getters, setters, and other useful methods to work with your data objects.  To see what I mean, fire an ORMExecuteQuery and run your variable through CFDUMP.

To sum up, I’m really starting to buy into using ORMs.  Since I know and love SQL, I’ve been anti ORM for too long.  Having said that, I’m not fully advocating going ORM for everything.  Pretty much every project I work on these days is powered by some datasource, but I don’t really need all the ORM baggage for simple sites.  Now for large applications, or any site large enough to need at least two people, I’d give ORM a chance.  I still have lots of ins and outs to learn about using Hibernate, but it is definitely simple enough to get jamming right away.