1. Session 8: Data Management (with Stored Procedures)

2. Data Management (Using Stored Procedures) What Is a Stored Procedure? Why Use Stored Procedures? Calling Stored Procedures Using Parameters Input Parameters Output Parameters

3. What Is a Stored Procedure? A common data procedures that can be called by many Web applications Programmatic access to a database Return records Return value Perform action Client SQL Server Web Form Stored Procedure Web Server Database

4. Why Use Stored Procedures? Modular programming Distribution of work Database security Faster execution Reduces network traffic Provides flexibility

5. Calling Stored Procedures Identify the stored procedure Set up the SelectCommand property of the DataAdapter Run the stored procedure and store returned records Dim daCategory As New SqlDataAdapter() daCategory.SelectCommand = New SqlCommand() daCategory.SelectCommand.Connection = conn daCategory.SelectCommand.CommandText = "ProductCategoryList" daCategory.SelectCommand.CommandType = CommandType.StoredProcedure Dim daCategory As New SqlDataAdapter() daCategory.SelectCommand = New SqlCommand() daCategory.SelectCommand.Connection = conn daCategory.SelectCommand.CommandText = "ProductCategoryList" daCategory.SelectCommand.CommandType = CommandType.StoredProcedure daCategory.Fill(ds, "Categories")

6. Example: Calling a Stored Procedure

7. Using Parameters Identify the available parameters Input Output InputOutput ReturnValue Include parameters in the parameters collection or Include parameter values in the command string

8. Passing Input Parameters Create parameter, set direction and value, add to the Parameters collection Run stored procedure and store returned records SqlParameter param = new SqlParameter ("@Beginning_Date", SqlDbType.DateTime); param.Direction = ParameterDirection.Input; param.Value = Convert.ToDateTime (txtStartDate.Text); da.SelectCommand.Parameters.Add(param); SqlParameter param = new SqlParameter ("@Beginning_Date", SqlDbType.DateTime); param.Direction = ParameterDirection.Input; param.Value = Convert.ToDateTime (txtStartDate.Text); da.SelectCommand.Parameters.Add(param); ds = New DataSet(); da.Fill(ds, "Products"); ds = New DataSet(); da.Fill(ds, "Products"); ds = New DataSet() da.Fill(ds, "Products") ds = New DataSet() da.Fill(ds, "Products") param = New SqlParameter _ ("@Beginning_Date", SQLDbType.DateTime) param.Direction = ParameterDirection.Input param.Value = CDate(txtStartDate.Text) da.SelectCommand.Parameters.Add(param) param = New SqlParameter _ ("@Beginning_Date", SQLDbType.DateTime) param.Direction = ParameterDirection.Input param.Value = CDate(txtStartDate.Text) da.SelectCommand.Parameters.Add(param)

9. Using Output Parameters Create parameter, set direction, add to the Parameters collection Run stored procedure and store returned records Read output parameters param = New SqlParameter("@ItemCount", SQLDbType.Int) param.Direction = ParameterDirection.Output da.SelectCommand.Parameters.Add(param) param = New SqlParameter("@ItemCount", SQLDbType.Int) param.Direction = ParameterDirection.Output da.SelectCommand.Parameters.Add(param) ds = new DataSet() da.Fill(ds) ds = new DataSet() da.Fill(ds) iTotal = da.Parameters("@ItemCount").Value

10. Example: Passing Parameters