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Calling a stored procedure with a command

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Applies to: Access 2013, Office 2013

You can also use a command when calling a stored procedure. The following code calls a stored procedure in the Northwind sample database, called CustOrdersOrders, which is defined as follows:

 
CREATE PROCEDURE CustOrdersOrders @CustomerID nchar(5) AS 
SELECT OrderID, OrderDate, RequiredDate, ShippedDate 
FROM Orders 
WHERE CustomerID = @CustomerID 
ORDER BY OrderID

This stored procedure is similar to the command used in Command Object Parameters, in that it takes a customer ID parameter and returns information about that customer's orders. The code below uses this stored procedure as the source for an ADO Recordset.

Using the stored procedure allows you to access another capability of ADO: the Parameters collection Refresh method. By using this method, ADO can automatically fill in all information about the parameters required by the command at run time. There is a performance penalty in using this technique, because ADO must query the data source for the information about the parameters.

Other important differences exist between the code below and the code in Command Object Parameters, where the parameters were entered manually. First, this code does not set the Prepared property to True because it is a SQL Server stored procedure and is precompiled by definition. Second, the CommandType property of the Command object changed to adCmdStoredProc in the second example to inform ADO that the command was a stored procedure.

 
'BeginAutoParamCmd 
 On Error GoTo ErrHandler: 
 
 Dim objConn As New ADODB.Connection 
 Dim objCmd As New ADODB.Command 
 Dim objParm1 As New ADODB.Parameter 
 Dim objRs As New ADODB.Recordset 
 
 ' Set CommandText equal to the stored procedure name. 
 objCmd.CommandText = "CustOrdersOrders" 
 objCmd.CommandType = adCmdStoredProc 
 
 ' Connect to the data source. 
 Set objConn = GetNewConnection 
 objCmd.ActiveConnection = objConn 
 
 ' Automatically fill in parameter info from stored procedure. 
 objCmd.Parameters.Refresh 
 
 ' Set the param value. 
 objCmd(1) = "ALFKI" 
 
 ' Execute once and display... 
 Set objRs = objCmd.Execute 
 
 Debug.Print objParm1.Value 
 Do While Not objRs.EOF 
 Debug.Print vbTab & objRs(0) & vbTab & objRs(1) & vbTab & _ 
 objRs(2) & vbTab & objRs(3) 
 objRs.MoveNext 
 Loop 
 
 ' ...then set new param value, re-execute command, and display. 
 objCmd(1) = "CACTU" 
 Set objRs = objCmd.Execute 
 
 Debug.Print objParm1.Value 
 Do While Not objRs.EOF 
 Debug.Print vbTab & objRs(0) & vbTab & objRs(1) & vbTab & _ 
 objRs(2) & vbTab & objRs(3) 
 objRs.MoveNext 
 Loop 
 
 'clean up 
 objRs.Close 
 objConn.Close 
 Set objRs = Nothing 
 Set objConn = Nothing 
 Set objCmd = Nothing 
 Set objParm1 = Nothing 
 Exit Sub 
 
ErrHandler: 
 'clean up 
 If objRs.State = adStateOpen Then 
 objRs.Close 
 End If 
 
 If objConn.State = adStateOpen Then 
 objConn.Close 
 End If 
 
 Set objRs = Nothing 
 Set objConn = Nothing 
 Set objCmd = Nothing 
 Set objParm1 = Nothing 
 
 If Err <> 0 Then 
 MsgBox Err.Source & "-->" & Err.Description, , "Error" 
 End If 
'EndAutoParamCmd