ADO Header-Detail Relational Tables (without using datacontrols)
This is a demonstration to show you how Header Tables relate with Detail Tables. Don't forget to vote for it.
Original Author: Walter Narvasa
Inputs
Save this text to "ADOHeaderDetail.FRM" and use the NWIND.MDB from Northwind.
Code
VERSION 5.00
Object = "{CDE57A40-8B86-11D0-B3C6-00A0C90AEA82}#1.0#0"; "MSDATGRD.OCX"
Begin VB.Form ADOHeaderDetail
BorderStyle = 1 'Fixed Single
Caption = "Order Entry - ADO Header-Detail Sample by Walter A. Narvasa"
ClientHeight = 6495
ClientLeft = 1095
ClientTop = 390
ClientWidth = 9735
KeyPreview = -1 'True
LinkTopic = "Form1"
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 6495
ScaleWidth = 9735
StartUpPosition = 2 'CenterScreen
Begin VB.PictureBox picButtons
Align = 2 'Align Bottom
Appearance = 0 'Flat
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 300
Left = 0
ScaleHeight = 300
ScaleWidth = 9735
TabIndex = 34
Top = 5895
Width = 9735
Begin VB.CommandButton cmdCancel
Caption = "&Undo"
Height = 300
Left = 3600
TabIndex = 41
Top = 0
Visible = 0 'False
Width = 1095
End
Begin VB.CommandButton cmdClose
Caption = "E&xit"
Height = 300
Left = 4800
TabIndex = 39
Top = 0
Width = 1095
End
Begin VB.CommandButton cmdRefresh
Caption = "&Refresh"
Height = 300
Left = 3600
TabIndex = 38
Top = 0
Width = 1095
End
Begin VB.CommandButton cmdAdd
Caption = "&New"
Height = 300
Left = 0
TabIndex = 35
Top = 0
Width = 1095
End
Begin VB.CommandButton cmdEdit
Caption = "&Edit"
Height = 300
Left = 1200
TabIndex = 36
Top = 0
Width = 1095
End
Begin VB.CommandButton cmdUpdate
Caption = "&Save"
Height = 300
Left = 2400
TabIndex = 40
Top = 0
Visible = 0 'False
Width = 1095
End
Begin VB.CommandButton cmdDelete
Caption = "&Delete"
Height = 300
Left = 2400
TabIndex = 37
Top = 0
Width = 1095
End
End
Begin VB.PictureBox picStatBox
Align = 2 'Align Bottom
Appearance = 0 'Flat
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 300
Left = 0
ScaleHeight = 300
ScaleWidth = 9735
TabIndex = 28
Top = 6195
Width = 9735
Begin VB.CommandButton cmdLast
Height = 300
Left = 4545
Picture = "ADOHeaderDetail.frx":0000
Style = 1 'Graphical
TabIndex = 32
Top = 0
UseMaskColor = -1 'True
Width = 345
End
Begin VB.CommandButton cmdNext
Height = 300
Left = 4200
Picture = "ADOHeaderDetail.frx":0342
Style = 1 'Graphical
TabIndex = 31
Top = 0
UseMaskColor = -1 'True
Width = 345
End
Begin VB.CommandButton cmdPrevious
Height = 300
Left = 345
Picture = "ADOHeaderDetail.frx":0684
Style = 1 'Graphical
TabIndex = 30
Top = 0
UseMaskColor = -1 'True
Width = 345
End
Begin VB.CommandButton cmdFirst
Height = 300
Left = 0
Picture = "ADOHeaderDetail.frx":09C6
Style = 1 'Graphical
TabIndex = 29
Top = 0
UseMaskColor = -1 'True
Width = 345
End
Begin VB.Label lblStatus
BackColor = &H00FFFFFF&
BorderStyle = 1 'Fixed Single
Height = 285
Left = 690
TabIndex = 33
Top = 0
Width = 3360
End
End
Begin VB.TextBox txtFields
DataField = "ShipVia"
Height = 285
Index = 13
Left = 5640
TabIndex = 27
Top = 2415
Width = 3375
End
Begin VB.TextBox txtFields
DataField = "ShipRegion"
Height = 285
Index = 12
Left = 5640
TabIndex = 25
Top = 2100
Width = 3375
End
Begin VB.TextBox txtFields
DataField = "ShipPostalCode"
Height = 285
Index = 11
Left = 5640
TabIndex = 23
Top = 1785
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "ShippedDate"
Height = 285
Index = 10
Left = 5640
TabIndex = 21
Top = 1455
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "ShipName"
Height = 285
Index = 9
Left = 5640
TabIndex = 19
Top = 1140
Width = 3855
End
Begin VB.TextBox txtFields
DataField = "ShipCountry"
Height = 285
Index = 8
Left = 5640
TabIndex = 17
Top = 825
Width = 3855
End
Begin VB.TextBox txtFields
DataField = "ShipCity"
Height = 285
Index = 7
Left = 5640
TabIndex = 15
Top = 495
Width = 3855
End
Begin VB.TextBox txtFields
DataField = "ShipAddress"
Height = 285
Index = 6
Left = 5640
TabIndex = 13
Top = 180
Width = 3855
End
Begin VB.TextBox txtFields
DataField = "RequiredDate"
Height = 285
Index = 5
Left = 2040
TabIndex = 11
Top = 1785
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "Freight"
Height = 285
Index = 4
Left = 2040
TabIndex = 9
Top = 1455
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "CustomerID"
Height = 285
Index = 3
Left = 2040
TabIndex = 7
Top = 1140
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "EmployeeID"
Height = 285
Index = 2
Left = 2040
TabIndex = 5
Top = 825
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "OrderDate"
Height = 285
Index = 1
Left = 2040
TabIndex = 3
Top = 495
Width = 1455
End
Begin VB.TextBox txtFields
DataField = "OrderID"
Height = 285
Index = 0
Left = 2040
TabIndex = 1
Top = 180
Width = 1455
End
Begin MSDataGridLib.DataGrid grdDataGrid
Height = 2745
Left = 120
TabIndex = 42
Top = 3000
Width = 9360
_ExtentX = 16510
_ExtentY = 4842
_Version = 393216
AllowUpdate = 0 'False
HeadLines = 1
RowHeight = 15
BeginProperty HeadFont {0BE35203-8F91-11CE-9DE3-00AA004BB851}
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851}
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
ColumnCount = 2
BeginProperty Column00
DataField = ""
Caption = ""
BeginProperty DataFormat {6D835690-900B-11D0-9484-00A0C91110ED}
Type = 0
Format = ""
HaveTrueFalseNull= 0
FirstDayOfWeek = 0
FirstWeekOfYear = 0
LCID = 1033
SubFormatType = 0
EndProperty
EndProperty
BeginProperty Column01
DataField = ""
Caption = ""
BeginProperty DataFormat {6D835690-900B-11D0-9484-00A0C91110ED}
Type = 0
Format = ""
HaveTrueFalseNull= 0
FirstDayOfWeek = 0
FirstWeekOfYear = 0
LCID = 1033
SubFormatType = 0
EndProperty
EndProperty
SplitCount = 1
BeginProperty Split0
BeginProperty Column00
EndProperty
BeginProperty Column01
EndProperty
EndProperty
End
Begin VB.Label lblLabels
Caption = "Detail Information:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 14
Left = 120
TabIndex = 43
Top = 2760
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipVia:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 13
Left = 3720
TabIndex = 26
Top = 2415
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipRegion:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 12
Left = 3720
TabIndex = 24
Top = 2100
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipPostalCode:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 11
Left = 3720
TabIndex = 22
Top = 1785
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShippedDate:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 10
Left = 3720
TabIndex = 20
Top = 1455
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipName:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 9
Left = 3720
TabIndex = 18
Top = 1140
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipCountry:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 8
Left = 3720
TabIndex = 16
Top = 825
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipCity:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 7
Left = 3720
TabIndex = 14
Top = 495
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "ShipAddress:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 6
Left = 3720
TabIndex = 12
Top = 180
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "RequiredDate:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 5
Left = 120
TabIndex = 10
Top = 1785
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "Freight:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 4
Left = 120
TabIndex = 8
Top = 1455
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "CustomerID:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 3
Left = 120
TabIndex = 6
Top = 1140
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "EmployeeID:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 2
Left = 120
TabIndex = 4
Top = 825
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "OrderDate:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 1
Left = 120
TabIndex = 2
Top = 495
Width = 1815
End
Begin VB.Label lblLabels
Alignment = 1 'Right Justify
Caption = "OrderID:"
BeginProperty Font
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 255
Index = 0
Left = 120
TabIndex = 0
Top = 180
Width = 1815
End
End
Attribute VB_Name = "ADOHeaderDetail"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Program Sample by: Walter A. Narvasa
'Country: Philippines
'Experience: 6 years in Database Programming
'Email: walter@wancom.8k.com
'Website: wancom.8k.com
Dim WithEvents adoPrimaryRS As Recordset
Attribute adoPrimaryRS.VB_VarHelpID = -1
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=MSDataShape;Data PROVIDER=Microsoft.Jet.OLEDB.3.51;Data Source=D:Program LanguageMicrosoft Visual StudioVB98NWIND.MDB;"
Set adoPrimaryRS = New Recordset
adoPrimaryRS.Open "SHAPE {select OrderID,OrderDate,EmployeeID,CustomerID,Freight,RequiredDate,ShipAddress,ShipCity,ShipCountry,ShipName,ShippedDate,ShipPostalCode,ShipRegion,ShipVia from Orders Order by OrderID} AS ParentCMD APPEND ({select OrderID,ProductID,Quantity,UnitPrice,Discount from [Order Details] Order by ProductID } AS ChildCMD RELATE OrderID TO OrderID) AS ChildCMD", db, adOpenStatic, adLockOptimistic
Dim oText As TextBox
'Bind the text boxes to the data provider
For Each oText In Me.txtFields
Set oText.DataSource = adoPrimaryRS
Next
Set grdDataGrid.DataSource = adoPrimaryRS("ChildCMD").UnderlyingValue
mbDataChanged = False
End Sub
Private Sub Form_Resize()
On Error Resume Next
'This will resize the grid when the form is resized
grdDataGrid.Width = Me.ScaleWidth
grdDataGrid.Height = Me.ScaleHeight - grdDataGrid.Top - 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)
'This will display the current record position for this recordset
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)
'This is where you put validation code
'This event gets called when the following actions occur
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
With adoPrimaryRS
If Not (.BOF And .EOF) Then
mvBookMark = .Bookmark
End If
.AddNew
lblStatus.Caption = "Add record"
mbAddNewFlag = True
SetButtons False
End With
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()
'This is only needed for multi user apps
On Error GoTo RefreshErr
Set grdDataGrid.DataSource = Nothing
adoPrimaryRS.Requery
Set grdDataGrid.DataSource = adoPrimaryRS("ChildCMD").UnderlyingValue
Exit Sub
RefreshErr:
MsgBox Err.Description
End Sub
Private Sub cmdEdit_Click()
On Error GoTo EditErr
lblStatus.Caption = "Edit record"
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 'move to the new record
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
'moved off the end so go back
adoPrimaryRS.MoveLast
End If
'show the current record
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
'moved off the end so go back
adoPrimaryRS.MoveFirst
End If
'show the current record
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
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