Примеры свойств примеры CursorType, LockType и EditMode (Visual Basic)CursorType, LockType, and EditMode Properties Example (VB)

В этом примере показано задание свойств примеры CursorType и LockType перед открытием набора записей.This example demonstrates setting the CursorType and LockType properties before opening a Recordset. Он также показывает значение свойства EditMode в различных условиях.It also shows the value of the EditMode property under various conditions. Для выполнения этой процедуры требуется функция Едитмодеаутпут.The EditModeOutput function is required for this procedure to run.

'BeginEditModeVB  
  
    'To integrate this code  
    'replace the data source and initial catalog values  
    'in the connection string  
  
Public Sub Main()  
    On Error GoTo ErrorHandler  
  
    ' recordset variables  
    Dim rstEmployees As ADODB.Recordset  
    Dim Cnxn As ADODB.Connection  
    Dim strCnxn As String  
    Dim SQLEmployees As String  
  
     ' open connection  
    Set Cnxn = New ADODB.Connection  
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _  
        "Initial Catalog='Pubs';Integrated Security='SSPI';"  
    Cnxn.Open strCnxn  
  
      ' set recordset properties through object refs  
      ' instead of through arguments to Open method  
    Set rstEmployees = New ADODB.Recordset  
    Set rstEmployees.ActiveConnection = Cnxn  
    rstEmployees.CursorLocation = adUseClient  
    rstEmployees.CursorType = adOpenStatic  
    rstEmployees.LockType = adLockBatchOptimistic  
  
     ' open recordset with data from Employee table  
    SQLEmployees = "employee"  
    rstEmployees.Open SQLEmployees, , , , adCmdTable  
  
    ' Show the EditMode property under different editing states  
    rstEmployees.AddNew  
        rstEmployees!emp_id = "T-T55555M"  
        rstEmployees!fname = "temp_fname"  
        rstEmployees!lname = "temp_lname"  
            'call function below  
            'to output results to debug window  
        EditModeOutput "After AddNew:", rstEmployees.EditMode  
        rstEmployees.UpdateBatch  
        EditModeOutput "After UpdateBatch:", rstEmployees.EditMode  
        rstEmployees!fname = "test"  
        EditModeOutput "After Edit:", rstEmployees.EditMode  
    rstEmployees.Close  
  
    ' Delete new record because this is a demonstration  
    Cnxn.Execute "DELETE FROM employee WHERE emp_id = 'T-T55555M'"  
  
    ' clean up  
    Cnxn.Close  
    Set rstEmployees = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  
  
ErrorHandler:  
    ' clean up  
    If Not rstEmployees Is Nothing Then  
        If rstEmployees.State = adStateOpen Then rstEmployees.Close  
    End If  
    Set rstEmployees = 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  
  
Public Function EditModeOutput(strTemp As String, _  
   intEditMode As Integer)  
  
   ' Print report based on the value of the EditMode  
   ' property  
   Debug.Print strTemp  
   Debug.Print "  EditMode = ";  
  
   Select Case intEditMode  
      Case adEditNone  
         Debug.Print "adEditNone"  
      Case adEditInProgress  
         Debug.Print "adEditInProgress"  
      Case adEditAdd  
         Debug.Print "adEditAdd"  
   End Select  
  
End Function  
'EndEditModeVB  

См. такжеSee Also

Свойство примеры CursorType (ADO) CursorType Property (ADO)
курсортипинум CursorTypeEnum
EditMode, свойство EditMode Property
едитмодинум EditModeEnum
Свойство LockType (ADO) LockType Property (ADO)
локктипинум LockTypeEnum
Объект Recordset (ADO)Recordset Object (ADO)