user2491469 user2491469 - 2 years ago 63
SQL Question

SQL - Select value from specific column of the table

I am trying to make a c# windows forms project which would select a value from specific column of the table.

I have a table called "Person" which looks like this:

ID | Name | Job
1 | Peter| Mechanic
2 | John | Pilot

This is what I wanna do. If I write a name into the first textbox, I want to get a job of that person in the second textbox upon button click.

So let's say I write the name "John" into the textbox. I click the button and the program shows the word "pilot" in the second textbox.

How can I do that?

Answer Source

If you know the database that you are targeting, this is going to be a very straightforward SELECT query executing using a basic SqlConnection object (assuming a SQL Server database) :

using(var connection = new SqlConnection("{your-connection-string}"))
     // Build your query
     var query = "SELECT TOP 1 Job From YourTable WHERE Name = @Name";
     using(var command = new SqlCommand(query,connection))
          // Add your parameter to perform the query
          command.Parameters.AddWithValue("@Name", NameTextBox.Text);

          // Execute the query and retrieve the job
          var job = Convert.ToString(command.ExecuteScalar());
               // No job was found, handle accordingly
               // Set the job in the appropriate area
               JobTextBox.Text = job;

You would include this or similar code within your event to trigger your query (i.e. once you have your name populated, once you click your button, etc).

Recommended from our users: Dynamic Network Monitoring from WhatsUp Gold from IPSwitch. Free Download