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Creating a query with joined tables

From: ASP.NET Essential Training

Video: Creating a query with joined tables

In a dynamic data driven website, it's sometimes useful to be able to create printable reports, web pages that are able to be printed elegantly, but don't include all of the graphics and additional components that are needed on the screen. There are no particular components you use in ASP.NET for this purpose. For example, there is no built-in report class. Instead you use the existing web form controls such as the GridView control to present the data. And then combine those controls with some creative use of Cascading Style Sheets to modify the way the data is presented.

Creating a query with joined tables

In a dynamic data driven website, it's sometimes useful to be able to create printable reports, web pages that are able to be printed elegantly, but don't include all of the graphics and additional components that are needed on the screen. There are no particular components you use in ASP.NET for this purpose. For example, there is no built-in report class. Instead you use the existing web form controls such as the GridView control to present the data. And then combine those controls with some creative use of Cascading Style Sheets to modify the way the data is presented.

For the demonstrations in this chapter I'll use a website that's a part of the Exercise Files. Go to the menu and select File > Open Web Site, select the Reports folder under Ch10Reports and click Open. And then open the file JoinedData.aspx. Look at the file in Design view, you will see that it presents the website's banner graphic and menu, but little else. The first step to creating a report is to start with a GridView and an SqlDataSource. I'll go to the Database Explorer and then from there locate the titles table and then I'll drag the titles table and place it into the page. As always dragging the table into the page results in creating a GridView and a linked SqlDataSource. Now I'm going to modify the SqlDataSource by modifying its Select command. The Select command is a query, if you know your SQL you can hand code the query, but if you are fairly new to SQL you can use Visual Web Developer's Visuals Query Tool.

With the SqlDataSource object selected, I'll go to the Properties panel and double-click its header to make it float and then I'll drag it out, so I can see the properties more easily. Then I'll locate the SelectQuery property. The SelectQuery is the query that will be executed to retrieve data for presentation on the page. I'll click the button next to SelectQuery and that opens the Command and Parameter Editor. Now once again if you know your SQL you can hand code it here, but I'll use the Query Builder by clicking that button. When the Query Builder opens, it opens in a small window. I'll click in the lower corner and drag it out to full screen, so I can see more of its information. Now I would like to join the titles table with two other tables in the database, the Publishers and the Author's Information.

I will go to the top pane of the Query Builder, right-click and select Add Table and I'll choose Publishers and click Add. Then with the Add Table dialog still open I'll click Authors and click Add again. Then I'll close the Add Table dialog. Notice that when you add these tables, links are created automatically that's because the names of the columns in the tables are identical. So the pub_id column in publishers matches pub_id in titles and so on. Now I'm going to modify the columns that I want to display from the titles table. Notice that by default all of the columns are being displayed. I'm going to deselect all the key columns, title_id, pub_id and au_id. I'll definitely show the title and the price, but then I'll deselect the pubdate and notes.

Next I'll add the author. For the moment I'm only going to add the author's last name and then I'll add the publisher's name as well. I'll execute the query and show what the data looks like so far. The return data shows up in the bottom pane and I can see that I'm retrieving those four columns all joined together. Now I'm also going to sort the data. I'll go to the title row and then in the Sort Type column I'll choose Ascending. This will cause the data to be returned in ascending order by title. I'll execute the query again, check the results and sure enough it's in alphabetical order by title.

Finally, I'm going to take two of the columns from the authors table and join them together to create a single column with both values. Instead of returning the authors name as two columns, I'm going to return it for reporting purposes as a single column. I'll start in the first column, the one with a header of column, and I'll change the expression like this. First I'll drag this out so I can see more of it and then I'll start the expression with au_fname + ' ' + au_lname. This means that I'm using the value from the au_fname column plus a literal space wrapped in the single quote characters plus the au_lname column.

It's critical that you use single quotes in this context and not doubles. Then I'll tab over to the Alias column. I'm going to name this column fullName. So the result will be that when I get the data back from the server it will be exposed as a single column with the author's full name. Now I'll click Execute Query again and sure enough the fullName column contains the author's full name. So that's my query. Now I'll click OK and that takes me back to the Command and Parameter Editor where I can see the finished Select command. Then I'll click OK and that takes me back to the Properties panel.

Now I've finished the work on the SqlDataSource object. The next step is to modify the GridView. I'll click on the GridView. I'll open the task list and choose Refresh Schema. This prompt is telling me that I'm about to regenerate the column fields for the GridView and it will result into leading any changes I might have already made to existing column fields. That's okay. I didn't customize the GridView yet on purpose so I'll click Yes and then I'll take a look at the GridView and I'll see that in fact it is displaying the actual data I asked for. Now I'll save my changes pressing Ctrl+S and then preview the page in the browser by selecting Debug > Start Without Debugging and there is the result, the actual data displayed on the screen.

Now before I complete the video, I'll show you a couple of standard formatting tricks you can use. I'll close the browser and return to the GridView, open its task list and select Edit Columns. First I'll set the Header Text, I'll click on each field, go to the Header Text property and change it to a value that I want the user to see at the top of the column. For Title and price I'll simply uppercase the first character. For fullName I'll split that up into two words of Full Name. And for pub_name I'll replace that with the string of Publisher.

And I'll click OK. I will also deal with the price. When I run the page right now I see that the price is displayed in a raw numeric format. I'm going to fix that by applying currency formatting. I'll close the browser and go back to Visual Web Developer. Once again I'll edit the columns and I'll select the price. I'll go to the data section of the BoundField properties to the DataFormatString and I'll use the following format. I'll start with the brace, then zero meaning that I want to format the first value, the only one in this context, then a colon and an uppercase C for currency. I'll click OK and then I'll save and run the page again. And you will see this time that the numeric value is formatted as a currency value.

In the last step I'll apply some formatting, I'll go to the GridView, I'll select Auto Format and I'll choose one of the formats. I'm going to choose this one, Classic and click OK, and that applies Classic formatting to the GridView with a bluish background, white foreground for the heading and pretty standard text in the middle and alternating row colors. I will run the page and there is the result presenting joined data in a friendly, easy to look at HTML table with alternating row colors and a colorful presentation.

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This video is part of

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ASP.NET Essential Training

79 video lessons · 51267 viewers

David Gassner
Author

 
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  1. 18m 44s
    1. Welcome
      1m 42s
    2. Prerequisites
      2m 21s
    3. Using the exercise files
      1m 32s
    4. Upgrading exercise file websites for ASP.NET 4.5 (NEW)
      2m 40s
    5. What's new in ASP.NET 4 (NEW)
      3m 48s
    6. What's new in ASP.NET 4.5 (NEW)
      3m 23s
    7. What's new in this course update (NEW)
      3m 18s
  2. 33m 34s
    1. Understanding how ASP.NET works
      5m 52s
    2. Installing Microsoft Visual Web Developer 2008
      3m 43s
    3. Installing Visual Studio Express 2012 for web (NEW)
      2m 12s
    4. Hello World: Creating your first ASP.NET web site
      4m 28s
    5. Creating pages with dynamic output
      7m 39s
    6. Understanding the development web server
      4m 49s
    7. Exploring the development environment
      4m 51s
  3. 40m 2s
    1. Understanding Microsoft SQL Server
      5m 47s
    2. Installing SQL Server Express
      6m 51s
    3. Exploring SQL Server Management Studio Basic
      4m 23s
    4. Creating a new database
      8m 51s
    5. Connecting to the database in ASP.NET
      5m 35s
    6. Testing SQL queries
      3m 53s
    7. Presenting a dataset in an ASP.NET page
      4m 42s
  4. 25m 31s
    1. Understanding ASP.NET web form pages
      5m 51s
    2. Separating presentation and logic with code files
      4m 17s
    3. Adding web form controls to a page
      5m 25s
    4. Handling postback data in a web form page
      5m 50s
    5. Using data binding expressions
      4m 8s
  5. 48m 37s
    1. Creating a testing environment
      4m 40s
    2. Declaring and using a simple variable
      6m 14s
    3. Declaring and using a complex object
      6m 16s
    4. Using loops
      6m 52s
    5. Using functions
      9m 25s
    6. Using trace statements
      4m 47s
    7. Debugging with breakpoints
      5m 45s
    8. Commenting code
      4m 38s
  6. 17m 43s
    1. Creating web controls
      5m 53s
    2. Registering a user control on a web form page
      3m 25s
    3. Registering controls globally in the web.config file
      3m 53s
    4. Adding public properties to a web control
      4m 32s
  7. 19m 7s
    1. Understanding Cascading Style Sheets (CSS)
      5m 36s
    2. Attaching external CSS files
      3m 12s
    3. Defining a CSS selector
      6m 10s
    4. Using CSS class selectors in server controls
      4m 9s
  8. 30m 34s
    1. Presenting data with the GridView control
      5m 49s
    2. Controlling GridView paging and appearance
      5m 46s
    3. Editing data with the GridView control
      6m 57s
    4. Presenting data with the DataList control
      5m 42s
    5. Formatting data with binding expressions
      6m 20s
  9. 36m 46s
    1. Using the DetailsView control
      7m 33s
    2. Inserting data with the DetailsView control
      6m 36s
    3. Redirecting page requests
      9m 39s
    4. Creating an update page
      6m 20s
    5. Linking to update pages from the list page
      4m 3s
    6. Deleting database records
      2m 35s
  10. 22m 15s
    1. Customizing forms with item editing templates
      6m 7s
    2. Adding validator controls to a form
      6m 40s
    3. Controlling the validation error message display
      6m 24s
    4. Using the ValidationSummary control
      3m 4s
  11. 29m 49s
    1. Creating a query with joined tables
      8m 6s
    2. Replacing control style properties with CSS
      5m 50s
    3. Creating a CSS file for printing
      3m 14s
    4. Suppressing elements in printed web pages
      5m 47s
    5. Selecting data for a report
      6m 52s
  12. 11m 14s
    1. Understanding ViewState and managing postbacks
      4m 36s
    2. Using session variables
      6m 38s
  13. 20m 57s
    1. Turning on forms authentication
      1m 51s
    2. Creating a page to log in users
      4m 18s
    3. Creating a page to set up new users
      4m 6s
    4. Understanding the security database
      3m 27s
    5. Configuring security in the web.config file
      2m 59s
    6. Creating a page to log out users
      4m 16s
  14. 27m 56s
    1. Installing IIS on Windows XP
      6m 32s
    2. Installing ASP.NET 3.5 on Windows XP
      1m 39s
    3. Deploying a site on Windows XP
      5m 9s
    4. Installing Information Internet Services (IIS) on Windows Vista, Windows 7, and Windows 8
      1m 56s
    5. Configuring ASP.NET 3.5 on Windows Vista
      2m 15s
    6. Deploying an application on Windows Vista
      3m 29s
    7. Scripting a database for deployment
      3m 36s
    8. Exporting database scripts in SQL Server Management Studio 2012 (NEW)
      3m 20s
  15. 2m 0s
    1. Where to go from here
      2m 0s

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