Update 和 CancelUpdate 方法范例
内容
Update 和 CancelUpdate 方法范例
该范例连同 CancelUpdate 方法说明 Update 方法。
Public Sub UpdateX()
Dim rstEmployees As ADODB.Recordset
Dim strOldFirst As String
Dim strOldLast As String
Dim strMessage As String
' 使用雇员表中的姓名打开记录集。
strCnn = "Provider=sqloledb;" & _
"Data Source=srv;Initial Catalog=pubs;User Id=sa;Password=; "
Set rstEmployees = New ADODB.Recordset
rstEmployees.CursorType = adOpenKeyset
rstEmployees.LockType = adLockOptimistic
rstEmployees.Open "SELECT fname, lname " & _
"FROM Employee ORDER BY lname", strCnn, , , adCmdText
' 储存原始数据。
strOldFirst = rstEmployees!fname
strOldLast = rstEmployees!lname
' 更改编辑缓冲区中的数据。
rstEmployees!fname = "Linda"
rstEmployees!lname = "Kobara"
' 显示缓冲区的内容并获取用户输入。
strMessage = "Edit in progress:" & vbCr & _
" Original data = " & strOldFirst & " " & _
strOldLast & vbCr & " Data in buffer = " & _
rstEmployees!fname & " " & rstEmployees!lname & vbCr & vbCr & _
"Use Update to replace the original data with " & _
"the buffered data in the Recordset?"
If MsgBox(strMessage, vbYesNo) = vbYes Then
rstEmployees.Update
Else
rstEmployees.CancelUpdate
End If
' 显示结果数据。
MsgBox "Data in recordset = " & rstEmployees!fname & " " & _
rstEmployees!lname
' 恢复原始数据，因为这只是演示。
If Not (strOldFirst = rstEmployees!fname And _
strOldLast = rstEmployees!lname) Then
rstEmployees!fname = strOldFirst
rstEmployees!lname = strOldLast
rstEmployees.Update
End If
rstEmployees.Close
End Sub
该范例连同 AddNew 方法说明 Update 方法。
Public Sub UpdateX2()
Dim cnn1 As ADODB.Connection
Dim rstEmployees As ADODB.Recordset
Dim strEmpID As String
Dim strOldFirst As String
Dim strOldLast As String
Dim strMessage As String
' 打开连接。
Set cnn1 = New ADODB.Connection
strCnn = "Provider=sqloledb;" & _
"Data Source=srv;Initial Catalog=pubs;User Id=sa;Password=; "
cnn1.Open strCnn
' 使用雇员表中的数据打开记录集。
Set rstEmployees = New ADODB.Recordset
rstEmployees.CursorType = adOpenKeyset
rstEmployees.LockType = adLockOptimistic
rstEmployees.Open "employee", cnn1, , , adCmdTable
rstEmployees.AddNew
strEmpID = "B-S55555M"
rstEmployees!emp_id = strEmpID
rstEmployees!fname = "Bill"
rstEmployees!lname = "Sornsin"
' 显示缓冲区内容并获取用户输入。
strMessage = "AddNew in progress:" & vbCr & _
"Data in buffer = " & rstEmployees!emp_id & ", " & _
rstEmployees!fname & " " & rstEmployees!lname & vbCr & vbCr & _
"Use Update to save buffer to recordset?"
If MsgBox(strMessage, vbYesNoCancel) = vbYes Then
rstEmployees.Update
' 转到新记录并显示结果数据。
MsgBox "Data in recordset = " & rstEmployees!emp_id & ", " & _
rstEmployees!fname & " " & rstEmployees!lname
Else
rstEmployees.CancelUpdate
MsgBox "No new record added."
End If
' 删除新数据，因为这只是演示。
cnn1.Execute "DELETE FROM employee WHERE emp_id = '" & strEmpID & "'"
rstEmployees.Close
End Sub