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Using ADO.NET in your application

From: Visual Studio 2010 Essential Training

Video: Using ADO.NET in your application

ADO.NET is the core library for accessing data from relational and ODBC databases. There are a number of specialized namespaces, but for today's example, I'm going to use the SQL client classes. I am going to start by showing you some basic ADO.NET code. I'll show you how to connect to a database. We'll execute queries against the database using the command object, and then I'll show you how to store data in a local cache, known as a DataSet. I am inside of Visual Studio, and I've opened a solution called WorkingWithAdo. Inside that is a project that already contains a database called northwind.mdf, and it contains a form, Form1.cs.

Using ADO.NET in your application

ADO.NET is the core library for accessing data from relational and ODBC databases. There are a number of specialized namespaces, but for today's example, I'm going to use the SQL client classes. I am going to start by showing you some basic ADO.NET code. I'll show you how to connect to a database. We'll execute queries against the database using the command object, and then I'll show you how to store data in a local cache, known as a DataSet. I am inside of Visual Studio, and I've opened a solution called WorkingWithAdo. Inside that is a project that already contains a database called northwind.mdf, and it contains a form, Form1.cs.

If I open up this user interface, I'll see there are three buttons and one list box. I am going to start by showing you how to connect to the database. I'll do that by double-clicking on this Connect button, which will take me to my C# code. To get a little more screen real estate, I am going to close this output window on the bottom of the screen. Before you do anything with the database, you need to create a connection. I am going to use this called SqlConnection. I then need to provide a ConnectionString that explains all the details about where to find the database.

In my case, it's going to look in a folder called DataDirectory, and it's going to look for a file called northwind.mdf. To open the connection, I'll take my connection object and call open. To close the connection, I'll call the Close method. And then to verify that the connection is open, I am going to type in "MessageBox.Show". Then I'm going to ask the connection for its current state, like this line of code. And then I'll copy this message box code and paste it after the conn.Close.

I am going to press F5 to run the application, and then say yes to this dialog. Then if I did everything correctly, when I click on this Connect To DB, I see the Open dialog and then immediately after that I see the Closed dialog. Once you've opened the connection, you can instruct the database to manipulate the data. You're probably familiar with the four basic operations you can do in a database, sometimes called the CRUD operation: you can create data, read the data, update the data, or delete the data.

In SQL, we use the insert, select, update, and delete queries. So what I am going to do on this second button click procedure down here is I am going to open my connection, and then I am going to declare a cmd object. Next, I specify the CommandText that I want to send over to the database.

This will be my SQL text. So I'll say Select * from shippers, which is the table I am interested in. Then I am going to tell the command object to use the connection to talk to the database, like so. Now, the rest of this code, I am going to uncomment, Ctrl+K, Ctrl+U. This executes the reader against the database, which is going to return some rows.

I checked to see if there are any rows in the reader. If there are rows, then I call Read, which gives me the first piece of data, and then I call reader.GetSqlString and I go get the column with the number 1 from the data-- that's the first column of data--and I am going to add that to the ListBox. Then I have this while loop that continues to read until it's empty. Then I close the reader, and then down here I've got another query against a database. I am going to do an update query.

So, I have another command text what I am going to call as Update Shippers Set CompanyName, or shipper id, and then I am going to create a random number here, and I'll execute that query. I don't need to iterate over the results, because I'm inserting data, or updating the data into the database. I'll run this application, press F5, and there is our shipper data. For my last demo, I want to talk about the DataSet. Ado contains this class called the DataSet.

This acts like an in memory disconnected representation of your database. Like a database, a DataSet can contain data tables consisting of rows and columns. You can also define data relationships, constraints, and other database-like constructs, but remember that the data set is stored locally and is in memory only. So this last button's code down here is going to create the DataSet. So here, I declare a DataSet. Think of this as an in memory database.

I am declaring a table like this shipper table here, and then I create what's called a Data Adapter. It's the DataAdapter's job to fill the table and to push the data back into the database. When I have the shipper data, I can then create a SelectCommand, which is like the command I created up here, and I am saying here is the Select statement. Now, unlike up above, this data adapter can hold the SelectCommand, and it also can hold text for the UpdateCommand, for the inserting of data, and for the deleting of data.

So it can do all four of those operations. I am doing the same thing down here with the productAdapter. I am creating a product. I am saying select start from product. I'm adding the Shippers table to the DataSet. I am adding the Products table to the DataSet, and then finally I'm calling Fill and say, "Here's the DataSet. Go out and get the data and put it inside the Shippers table." My last step is to take the data from the Products table and put it in the list box via the DataSource property.

Let's see if this works. Press F5, click the Fill DataSet, and there is all our product names from the database. Now, as you can imagine, this is a lot of work. I have to create all of my DataSets by hand. So there is a wizard that is part of Visual Studio that generates these DataSets on my behalf. That's the topic of the next movie in this chapter.

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This video is part of

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Visual Studio 2010 Essential Training

86 video lessons · 30138 viewers

Walt Ritscher
Author

 
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  1. 2m 3s
    1. Welcome
      1m 2s
    2. Using the exercise files
      1m 1s
  2. 7m 19s
    1. Understanding the Visual Studio versions
      3m 51s
    2. Setting up your developer computer
      3m 28s
  3. 58m 2s
    1. Creating a Visual Studio project
      4m 58s
    2. Working with Solution Explorer
      6m 32s
    3. Working with big projects
      3m 53s
    4. Taking a tour of the Integrated Developer Environment (IDE)
      8m 36s
    5. Introducing drag-and-drop UI design
      7m 38s
    6. Working with the Properties window
      6m 44s
    7. Looking at Server Explorer
      7m 4s
    8. Exploring the new Help engine
      6m 41s
    9. Setting options for the IDE
      5m 56s
  4. 39m 25s
    1. Creating a simple WPF application
      1m 32s
    2. Building the UI with the editors
      9m 14s
    3. Working with the application code
      3m 37s
    4. Communicating with the web site
      7m 15s
    5. Connecting your data
      8m 4s
    6. Binding to an RSS feed
      5m 4s
    7. Packaging and deploying the application
      4m 39s
  5. 39m 46s
    1. What languages are supported in Visual Studio 2010?
      1m 17s
    2. Exploring basic settings for the Code Editor
      5m 35s
    3. Writing a C# program
      6m 48s
    4. Writing a VB program
      6m 29s
    5. Working with C++
      6m 38s
    6. Working with F Sharp
      6m 9s
    7. Font and color options
      6m 50s
  6. 1h 5m
    1. Formatting your code
      6m 43s
    2. Navigating your code
      7m 44s
    3. Using the Task List
      2m 26s
    4. Commenting your code
      2m 45s
    5. Documenting your code
      8m 26s
    6. Using IntelliSense effectively
      7m 0s
    7. Working with code snippets
      6m 25s
    8. Refactoring your code
      5m 15s
    9. Understanding code generation
      2m 10s
    10. Generating code with T4
      6m 29s
    11. Using the Class View, Class Designer, and Class Diagram tools
      5m 51s
    12. Refactoring VB with CodeRush Xpress
      4m 33s
  7. 1h 11m
    1. Working with project and item templates
      8m 38s
    2. Creating a console application
      7m 5s
    3. Creating a class library
      6m 26s
    4. Creating a web site with ASP.NET
      7m 37s
    5. Creating a rich internet application with Silverlight
      6m 57s
    6. Creating a classic Windows application with Windows Forms
      10m 31s
    7. Creating a dramatic Windows application with Windows Presentation Foundation (WPF)
      4m 41s
    8. Creating a WCF service
      9m 1s
    9. Using an existing WCF service
      6m 38s
    10. Navigation UI designs with the Document Outline view
      3m 41s
  8. 33m 18s
    1. Creating a data project with SQL Project
      6m 24s
    2. Clarifying the confusion on .NET Data
      3m 31s
    3. Using ADO.NET in your application
      6m 50s
    4. Creating typed datasets
      7m 55s
    5. Using the data binding tools
      8m 38s
  9. 30m 13s
    1. Debugging code
      9m 32s
    2. Working with the Watch and other debug windows
      7m 46s
    3. Other debugging techniques
      6m 50s
    4. IntelliTrace historical debugging in Visual Studio Ultimate
      6m 5s
  10. 17m 56s
    1. Understanding Visual Studio editions and test tools
      2m 22s
    2. Verifying your code with unit tests
      8m 58s
    3. Running performance and load tests
      6m 36s
  11. 34m 5s
    1. Building your application
      4m 19s
    2. Customizing the build process with MSBuild
      6m 36s
    3. Setting assembly information
      2m 12s
    4. Deploying a basic Windows application
      2m 19s
    5. Creating an installer with Visual Studio
      7m 39s
    6. Creating a ClickOnce application
      5m 13s
    7. Setting up IIS for deploy
      2m 9s
    8. Deploying a Silverlight or ASP.NET application
      3m 38s
  12. 14m 0s
    1. Understanding source control
      2m 9s
    2. Setting up Team Foundation Server source control
      3m 5s
    3. Using Team Foundation Server source control
      8m 46s
  13. 17m 31s
    1. Understanding the .NET Office integration
      4m 16s
    2. Making a Word 2010 application
      7m 54s
    3. Making an Excel 2010 add-in
      5m 21s
  14. 31m 34s
    1. Understanding the extensibility model in Visual Studio
      2m 17s
    2. Adding external tools to the Tools menu
      4m 42s
    3. Creating macros
      7m 16s
    4. Using the Extension Manager
      5m 1s
    5. Creating an MEF add-in
      7m 9s
    6. Deploying and installing an add-in with VSIX
      5m 9s
  15. 25m 34s
    1. Working with configuration files
      5m 37s
    2. Using the Settings Editor
      7m 30s
    3. Using the Resources Editor
      6m 59s
    4. Localizing your resources
      5m 28s
  16. 1m 17s
    1. Goodbye
      1m 17s

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