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Passing parameters

From: SQL Server: Triggers, Stored Procedures, and Functions

Video: Passing parameters

Now it's time to implement the functionality that will allow the user to insert a new author. In order to do this, we'll have to get our web page to accept some input and then pass that input as parameters to a stored procedure. First let's create the stored procedure that expects the parameters. I have pre-staged a stored procedure. We'll go ahead and look at that code. The procedure's name is InsertNewAuthor and accepts two parameters, a firstName parameter and a lastName parameter, and then it executes a simple INSERT statement, inserted into the Authors table, FirstName LastName and the Active status of 1. Command(s) completed successfully. That looks good.

Passing parameters

Now it's time to implement the functionality that will allow the user to insert a new author. In order to do this, we'll have to get our web page to accept some input and then pass that input as parameters to a stored procedure. First let's create the stored procedure that expects the parameters. I have pre-staged a stored procedure. We'll go ahead and look at that code. The procedure's name is InsertNewAuthor and accepts two parameters, a firstName parameter and a lastName parameter, and then it executes a simple INSERT statement, inserted into the Authors table, FirstName LastName and the Active status of 1. Command(s) completed successfully. That looks good.

Now back on our web page, I'll insert my cursor into the blank area under insert new author, and I'm going to type the phrase FirstName and then, I'll drag a text box from the Toolbox that will be used to insert the FirstName. I'll then put a hard Return after that and type LastName, drag another textbox, and then under all that, we'll want a single button that will cause the insert to happen.

I want to rename that first textbox, so I'll right-click on it and look at the Properties. At the very bottom of the Properties, it currently has the ID of TextBox. It's not very descriptive. I'd like it to have the ID of FirstName. and similarly the other textbox should have the ID of LastName. So that's ready to go. Now I'll double-click on the button and that'll take me to the area where I can write the code, and again, I have pre-staged some code, so I'm going to delete all of the stuff that's already there and copy and paste my own.

Looking at the top, we have several using statements that are all necessary to communicate between the web page and the database, and then we see the bulk of our work happens here in the Button_Click method. We're going to create a new connection and I'll scroll over and show you that connection is based on the ConnectionString we created previously, myDatabaseConnectionString. We'll create a new command, the CommandText will be InsertNewAuthor, the exact name of our stored procedure and the CommandType will be StoredProcedure and we'll connect the command to the connection.

Now for the parameters. We're creating two parameters: one called firstNameParam and one called lastNameParam. These correspond to the parameters the stored procedure is expecting called firstName and lastName respectively, and they will get their values from the textbox, FirstName.Text and LastName.Text. Just creating the parameters doesn't connect them to the command. So we have to do that in two additional lines of code, where we add the parameters to the command.

Then we have our typical open the connection, ExecuteNonQuery and close the connection. I've also included one more line of code to refresh the DataGrid. The DataGrid that's on the top of the screen that shows our active authors will now need to be refreshed, because we just inserted a new author. So let's test this. So for my new author, we'll do a FirstName of Steven, LastName of Jones, hit the button, and look at that, in our Active Authors grid, we now see Steven Jones.

So this proves we successfully made a round-trip from the web page, it took the parameter Steven and the parameter Jones, passed those two parameters to the stored procedure and the stored procedure executed as desired.

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This video is part of

Image for SQL Server: Triggers, Stored Procedures, and Functions
 
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  1. 2m 15s
    1. Welcome
      51s
    2. What you should know
      51s
    3. Using the exercise files
      33s
  2. 11m 1s
    1. Comparing triggers, functions, and procedures
      3m 25s
    2. Why use a stored procedure?
      4m 59s
    3. Why use functions?
      1m 27s
    4. Why use triggers?
      1m 10s
  3. 6m 2s
    1. Configuring your environment
      4m 53s
    2. Downloading and installing a sample database
      1m 9s
  4. 26m 25s
    1. Creating a stored procedure
      2m 46s
    2. Modifying a stored procedure
      2m 34s
    3. Returning data using data sets
      3m 45s
    4. Returning data using cursors
      3m 45s
    5. Using input and output parameters
      5m 24s
    6. Using security and permissions
      5m 24s
    7. Using transactions
      2m 47s
  5. 11m 56s
    1. Creating a user-defined function
      4m 59s
    2. Exploring single-value functions
      4m 18s
    3. Exploring table value functions
      2m 39s
  6. 9m 31s
    1. Using "after" triggers
      3m 47s
    2. Using "instead of" triggers
      2m 9s
    3. Using nested triggers
      1m 38s
    4. Using database-level triggers
      1m 57s
  7. 12m 43s
    1. Exploring a real-world INSERT procedure
      5m 32s
    2. Exploring a real-world UPDATE procedure
      3m 13s
    3. Implementing logging on DELETE
      3m 58s
  8. 19m 38s
    1. Understanding the Common Language Runtime (CLR) and the .NET framework
      1m 52s
    2. Using CLR with SQL Server 2012
      4m 11s
    3. Writing stored procedures with C# .NET
      5m 51s
    4. Writing functions with .NET
      5m 7s
    5. Choosing between T-SQL vs. CLR
      2m 37s
  9. 11m 34s
    1. Creating a basic web form and connecting to a database
      2m 56s
    2. Executing a stored procedure
      2m 4s
    3. Passing parameters
      3m 41s
    4. Getting return values
      2m 53s
  10. 1m 43s
    1. Next steps
      1m 43s

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