Примеры методов Append и CreateParameter (Visual Basic)
В этом примере используются методы Append и CreateParameter для выполнения хранимой процедуры с входным параметром.
'BeginAppendVB
'To integrate this code
'replace the data source and initial catalog values
'in the connection string
Public Sub Main()
On Error GoTo ErrorHandler
'recordset, command and connection variables
Dim Cnxn As ADODB.Connection
Dim cmdByRoyalty As ADODB.Command
Dim prmByRoyalty As ADODB.Parameter
Dim rstByRoyalty As ADODB.Recordset
Dim rstAuthors As ADODB.Recordset
Dim strCnxn As String
Dim strSQLAuthors As String
Dim strSQLByRoyalty As String
'record variables
Dim intRoyalty As Integer
Dim strAuthorID As String
' Open connection
Set Cnxn = New ADODB.Connection
strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _
"Initial Catalog='Pubs';Integrated Security='SSPI';"
Cnxn.Open strCnxn
' Open command object with one parameter
Set cmdByRoyalty = New ADODB.Command
cmdByRoyalty.CommandText = "byroyalty"
cmdByRoyalty.CommandType = adCmdStoredProc
' Get parameter value and append parameter
intRoyalty = Trim(InputBox("Enter royalty:"))
Set prmByRoyalty = cmdByRoyalty.CreateParameter("percentage", adInteger, adParamInput)
cmdByRoyalty.Parameters.Append prmByRoyalty
prmByRoyalty.Value = intRoyalty
' Create recordset by executing the command
Set cmdByRoyalty.ActiveConnection = Cnxn
Set rstByRoyalty = cmdByRoyalty.Execute
' Open the Authors Table to get author names for display
' and set cursor client-side
Set rstAuthors = New ADODB.Recordset
strSQLAuthors = "Authors"
rstAuthors.Open strSQLAuthors, Cnxn, adUseClient, adLockOptimistic, adCmdTable
' Print recordset adding author names from Authors table
Debug.Print "Authors with " & intRoyalty & " percent royalty"
Do Until rstByRoyalty.EOF
strAuthorID = rstByRoyalty!au_id
Debug.Print " " & rstByRoyalty!au_id & ", ";
rstAuthors.Filter = "au_id = '" & strAuthorID & "'"
Debug.Print rstAuthors!au_fname & " " & rstAuthors!au_lname
rstByRoyalty.MoveNext
Loop
' clean up
rstByRoyalty.Close
rstAuthors.Close
Cnxn.Close
Set rstByRoyalty = Nothing
Set rstAuthors = Nothing
Set Cnxn = Nothing
Exit Sub
ErrorHandler:
' clean up
If Not rstByRoyalty Is Nothing Then
If rstByRoyalty.State = adStateOpen Then rstByRoyalty.Close
End If
Set rstByRoyalty = Nothing
If Not rstAuthors Is Nothing Then
If rstAuthors.State = adStateOpen Then rstAuthors.Close
End If
Set rstAuthors = Nothing
If Not Cnxn Is Nothing Then
If Cnxn.State = adStateOpen Then Cnxn.Close
End If
Set Cnxn = Nothing
If Err <> 0 Then
MsgBox Err.Source & "-->" & Err.Description, , "Error"
End If
End Sub
'EndAppendVB
См. также:
Метод Append (ADO)
Метод CreateParameter (ADO)
Объект Field
Коллекция Fields (ADO)
Объект Parameter