怎么利用代码在程序中给DataGrid控件连接数据源？

[bybygone]

[zfcheng]

用ADO对像也可，或者就用ADO控件，然后记得要断开连接哦

[bybygone]

我想用ADO对象，但是不知道怎么用？

[zfcheng]

那就直接用ADO控件吧，这样做表格绑定比较容易，而且也很好用，很方便，但每次连接完记得要断开连接

[zhhrlzm]

Option Explicit

Dim WithEvents adoPrimaryRS As Recordset
Dim mbChangedByCode As Boolean
Dim mvBookMark As Variant
Dim mbEditFlag As Boolean
Dim mbAddNewFlag As Boolean
Dim mbDataChanged As Boolean

Private Sub Form_Load()
Dim db As Connection
Set db = New Connection
db.CursorLocation = adUseClient
db.Open "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=C:\db1.mdb;"

Set adoPrimaryRS = New Recordset
adoPrimaryRS.Open "select * from DDJLTAB", db, adOpenStatic, adLockOptimistic

Set grdDataGrid.DataSource = adoPrimaryRS


mbDataChanged = False
End Sub

Private Sub Form_Resize()
On Error Resume Next
'当窗体调整时会调整网格
grdDataGrid.Height = Me.ScaleHeight - 30 - picButtons.Height - picStatBox.Height
lblStatus.Width = Me.Width - 1500
cmdNext.Left = lblStatus.Width + 700
cmdLast.Left = cmdNext.Left + 340
End Sub

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
If mbEditFlag Or mbAddNewFlag Then Exit Sub

Select Case KeyCode
Case vbKeyEscape
cmdClose_Click
Case vbKeyEnd
cmdLast_Click
Case vbKeyHome
cmdFirst_Click
Case vbKeyUp, vbKeyPageUp
If Shift = vbCtrlMask Then
cmdFirst_Click
Else
cmdPrevious_Click
End If
Case vbKeyDown, vbKeyPageDown
If Shift = vbCtrlMask Then
cmdLast_Click
Else
cmdNext_Click
End If
End Select
End Sub

Private Sub Form_Unload(Cancel As Integer)
Screen.MousePointer = vbDefault
End Sub

Private Sub adoPrimaryRS_MoveComplete(ByVal adReason As ADODB.EventReasonEnum, ByVal pError As ADODB.Error, adStatus As ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
'为这个 recordset 显示当前记录位置
lblStatus.Caption = "Record: " & CStr(adoPrimaryRS.AbsolutePosition)
End Sub

Private Sub adoPrimaryRS_WillChangeRecord(ByVal adReason As ADODB.EventReasonEnum, ByVal cRecords As Long, adStatus As ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
'验证代码置于此处
'下列动作发生时该事件被调用
Dim bCancel As Boolean

Select Case adReason
Case adRsnAddNew
Case adRsnClose
Case adRsnDelete
Case adRsnFirstChange
Case adRsnMove
Case adRsnRequery
Case adRsnResynch
Case adRsnUndoAddNew
Case adRsnUndoDelete
Case adRsnUndoUpdate
Case adRsnUpdate
End Select

If bCancel Then adStatus = adStatusCancel
End Sub

Private Sub cmdAdd_Click()
On Error GoTo AddErr
adoPrimaryRS.MoveLast
adoPrimaryRS.AddNew
grdDataGrid.SetFocus

Exit Sub
AddErr:
MsgBox Err.Description
End Sub

Private Sub cmdDelete_Click()
On Error GoTo DeleteErr
With adoPrimaryRS
.Delete
.MoveNext
If .EOF Then .MoveLast
End With
Exit Sub
DeleteErr:
MsgBox Err.Description
End Sub

Private Sub cmdRefresh_Click()
'只有多用户应用程序需要
On Error GoTo RefreshErr
Set grdDataGrid.DataSource = Nothing
adoPrimaryRS.Requery
Set grdDataGrid.DataSource = adoPrimaryRS

Exit Sub
RefreshErr:
MsgBox Err.Description
End Sub

Private Sub cmdEdit_Click()
On Error GoTo EditErr

lblStatus.Caption = "编辑记录"
mbEditFlag = True
SetButtons False
Exit Sub

EditErr:
MsgBox Err.Description
End Sub
Private Sub cmdCancel_Click()
On Error Resume Next

SetButtons True
mbEditFlag = False
mbAddNewFlag = False
adoPrimaryRS.CancelUpdate
If mvBookMark > 0 Then
adoPrimaryRS.Bookmark = mvBookMark
Else
adoPrimaryRS.MoveFirst
End If
mbDataChanged = False

End Sub

Private Sub cmdUpdate_Click()
On Error GoTo UpdateErr

adoPrimaryRS.UpdateBatch adAffectAll

If mbAddNewFlag Then
adoPrimaryRS.MoveLast '移到新记录
End If

mbEditFlag = False
mbAddNewFlag = False
SetButtons True
mbDataChanged = False

Exit Sub
UpdateErr:
MsgBox Err.Description
End Sub

Private Sub cmdClose_Click()
Unload Me
End Sub

Private Sub cmdFirst_Click()
On Error GoTo GoFirstError

adoPrimaryRS.MoveFirst
mbDataChanged = False

Exit Sub

GoFirstError:
MsgBox Err.Description
End Sub

Private Sub cmdLast_Click()
On Error GoTo GoLastError

adoPrimaryRS.MoveLast
mbDataChanged = False

Exit Sub

GoLastError:
MsgBox Err.Description
End Sub

Private Sub cmdNext_Click()
On Error GoTo GoNextError

If Not adoPrimaryRS.EOF Then adoPrimaryRS.MoveNext
If adoPrimaryRS.EOF And adoPrimaryRS.RecordCount > 0 Then
Beep
'已到最后返回
adoPrimaryRS.MoveLast
End If
'显示当前记录
mbDataChanged = False

Exit Sub
GoNextError:
MsgBox Err.Description
End Sub

Private Sub cmdPrevious_Click()
On Error GoTo GoPrevError

If Not adoPrimaryRS.BOF Then adoPrimaryRS.MovePrevious
If adoPrimaryRS.BOF And adoPrimaryRS.RecordCount > 0 Then
Beep
'已到最后返回
adoPrimaryRS.MoveFirst
End If
'显示当前记录
mbDataChanged = False

Exit Sub

GoPrevError:
MsgBox Err.Description
End Sub

Private Sub SetButtons(bVal As Boolean)
cmdAdd.Visible = bVal
cmdEdit.Visible = bVal
cmdUpdate.Visible = Not bVal
cmdCancel.Visible = Not bVal
cmdDelete.Visible = bVal
cmdClose.Visible = bVal
cmdRefresh.Visible = bVal
cmdNext.Enabled = bVal
cmdFirst.Enabled = bVal
cmdLast.Enabled = bVal
cmdPrevious.Enabled = bVal
End Sub

[bybygone]

但是问题是，利用ADO控件必须指定服务器名，这样程序的灵活度太小了。所以不想用ado控件。