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How to write a delete stored procedure

Posted on 2008-10-17
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Last Modified: 2012-05-05
Hi all I have a question. I need to know how to write a delete stored procedure please.
my fields are  @Name nvarchar (50), @Phone nvarchar(50), @Birthday datetime. and they exist in the table called tbl_Bday. any help would be great.
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Question by:HawaiiDragon
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chapmandew earned 2000 total points
ID: 22740490
Do you  mean a stored procedure to delete records?

create procedure mydeleteproc
(@name nvarchar(50), @phone nvarchar(50), @birthday datetime)
as
delete from tbl_bday
where name = @name and phone = @phone and birthday = @birthday

go
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Expert Comment

by:Steve Krile
ID: 22741057
chapmandew is correct as usual.

I would add however, that if you are expecting only one row to be deleted, you should consider using a datakey value rather than matching parameters.  You could argue that a Name, plus a Phone number, plus a birthday are unique, but of course we all know to expect the unexpected in DB design.

So, a "safer" delete statement would be something like
DELETE FROM tbl_bday
WHERE tbl_BdayID = @BDayID
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Author Comment

by:HawaiiDragon
ID: 22742059
Yes it needs to be a stored procedure. Im going to try chapmandews solution reall quick and see what I come up with.

any other ideas would be great too.
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LVL 16

Expert Comment

by:Steve Krile
ID: 22742120
Well, this is the DELETE portion of a stored procedure



create procedure mydeleteproc
(@BDayID)
as
DELETE FROM tbl_bday
WHERE tbl_BdayID = @BDayID

go
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Author Comment

by:HawaiiDragon
ID: 22742183
okay the procedure was great now im having problems executing it. I have a table and I need the row selected deleted when the user clicks the delete button. It is a datagridview. I think I see my problem but i dont know how to fix it I will put the code below.
    private void btnDelete_Click(object sender, EventArgs e)
        {
            //Inside a try
            try
            {
 
                SqlParameter[] test = new SqlParameter[3];
 
                 // I used the inserts from textboxes and now its in             //data grid view row Any Ideas???
  
              test[0] = new SqlParameter("@Name", tbName.Text);
                test[1] = new SqlParameter("@Phone", tbPhone.Text);
                test[2] = new SqlParameter("@Birthday", dateTimePicker1.Value);
 
                SqlConnection scs = new SqlConnection();
 
                string jaysisawesome = ConfigurationManager.ConnectionStrings["Phone_number_birthday.Properties.Settings.BirthdaysConnectionString"].ToString();
                scs.ConnectionString = jaysisawesome;
 
                SqlCommand cmd = new SqlCommand();
                //cmd.Connection = scs.ConnectionString;
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "NewDeleteCommand";
                cmd.Parameters.AddRange(test);
                cmd.Connection = scs;
                cmd.Connection.Open();
                int one = cmd.ExecuteNonQuery();
                cmd.Connection.Close();
 
                if (one > -1)
                {
                    MessageBox.Show("Database Updated");
                    this.Close();
                    PhoneListForm.ActiveForm.Refresh();
                }
                else
                {
                }
            }
            //Close connection in finally
            //Catch problems
            //sql command object
            //command type
            //DataAccess
            //Using AppConfig ConnectionString (pull from)
            //Params
            //ExecuteNonQuery
            catch (Exception ex)
            {
                ex.ToString();
            }
            this.Close();
            PhoneListForm.ActiveForm.Refresh();
        }

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Expert Comment

by:Steve Krile
ID: 22742489
Is there a Key in this database?  If so, you should set up the DataKeyValue for your grid.  Then, you can use the SelectedIndexValue property of the grid to pass the ID of the row you want to delete.

Then, instead of putting all this code on the button click event, you would wire it up to the SelectedIndexValueChanged event of the datagrid.
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Expert Comment

by:chapmandew
ID: 22742842
To be fair, you should probably submit a new question for your new question.
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Expert Comment

by:Steve Krile
ID: 22743012
True.  In fact, this type of data management is not something I suggest.  The way I prefer is using a class with Get, Set, Update, Delete, and Insert methods.  Then I like using the combination of ObjectDataSources and DataGrids for this type of work.

But, indeed, that is quite a different topic than how to write a Delete proc!  :)
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Author Comment

by:HawaiiDragon
ID: 22743610
true so I have closed this question and will open antoher in just a moment. Please check it out ... im lost... again :)
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