Search Tools Links Login

ADO


This is a simple sample in two parts, first project1.vbp is a sample of ADO with text and other types of files. The second part is for reading, writing, adding and editing to a database. This is for people who are looking for simple samples of ADO

The ADO through files has to be observed when the code is running becuase it is only meant for tempdata.
This has been written for windows 95, 98, ME, NT and 2000 but it hasn't been tested in only 2000.

Be sure to follow the instructions from the readme, there are almost no instructions but the one that I give, the code depends on. Also, the database is in Microsoft Access 97.

Original Author: Albert A Hocking III

Code


Form1:

Private Sub Command1_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data
'*****************************************************************************************************************************************************************
If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output As #1  'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output As #1  'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If

End Sub

Private Sub Command10_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data in Lock Read write mode
'*****************************************************************************************************************************************************************
If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output Lock Read Write As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output Lock Read Write As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If

End Sub
Private Sub Command12_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data in a random
'*****************************************************************************************************************************************************************

Dim FileNumber

FileNumber = 1

If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output As #FreeFile 'This opens the file as an output file
Print #FreeFile, "this is a line"   'This writes a line in the text file
Print #FreeFile, "This is another Line"  'This writes a line in the text file
Close #FreeFile    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output As #FreeFile 'This opens the file as an output file
Print #FreeFile, "this is a line"   'This writes a line in the text file
Print #FreeFile, "This is another Line"  'This writes a line in the text file
Close #FreeFile    'This closes the file, otherwise it would remain open until the user restarts their machine
End If

End Sub

Private Sub Command13_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data beginning and specify record lenth
'*****************************************************************************************************************************************************************
If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output As #1 Len = 10000 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output As #1 Len = 10000 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If

End Sub

Private Sub Command2_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time Appending to the previous data
'*****************************************************************************************************************************************************************

If Err.Number = 76 Then    'Test for 98
Open "C:Windows emp~00001.tmp" For Append As #1  'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Append As #1  'This opens the file as an output file
Print #1, "This is a line that appended"  'This writes a line in the text file
Print #1, "This is another Line that appended"  'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If
End Sub

Private Sub Command3_Click()
'*****************************************************************************************************************************************************************
'    This Reads Data from a file
'*****************************************************************************************************************************************************************
Dim retval

Open "C:ado est.ini" For Input As #1  'This opens the file as an output file
Do Until EOF(1)
Line Input #1, Data
retval = MsgBox(Data, vbOKOnly, "Data")
Loop
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End Sub

Private Sub Command4_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time Binary
'*****************************************************************************************************************************************************************

If Err.Number = 76 Then    'Test for 98
Open "C:Windows emp~00001.tmp" For Binary Access Write As #1 'This opens the file as an output file
Put #1, 30, "This is a line that appended"  'This writes a line in the text file
Put #1, 100, " "
Put #1, 500, "This is another Line that appended"
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Binary Access Write As #1 'This opens the file as an output file
Put #1, 30, "This is a line that appended"  'This writes a line in the text file
Put #1, 100, " "
Put #1, 500, "This is another Line that appended"  'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If
End Sub

Private Sub Command5_Click()
'*****************************************************************************************************************************************************************
'    This is for writing in a random order
'*****************************************************************************************************************************************************************
Open "c:ado est.db" For Random As #1
Put #1, 1, "This is a line that appended"  'This writes a line in the text file
Put #1, 2, "This is another Line that appended"  'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End Sub
Private Sub Command7_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data in shared mode
'*****************************************************************************************************************************************************************
If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output Shared As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output Shared As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If
End Sub
Private Sub Command8_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data in Lock write mode
'*****************************************************************************************************************************************************************
If Err.Number = 76 Then    'Test for 98
Open "C:windows emp~00001.tmp" For Output Lock Write As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
Else
Open "C:winnt emp~00001.tmp" For Output Lock Write As #1 'This opens the file as an output file
Print #1, "this is a line"   'This writes a line in the text file
Print #1, "This is another Line"   'This writes a line in the text file
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End If

End Sub

Private Sub Command9_Click()
'*****************************************************************************************************************************************************************
'    This is for writing data to a temp file each time overwriting the previous data in Lock Read mode
'*****************************************************************************************************************************************************************
Dim retval

Open "C:ado est.ini" For Input Lock Read As #1  'This opens the file as an output file
Do Until EOF(1)
Line Input #1, Data
retval = MsgBox(Data, vbOKOnly, "Data")
Loop
Close #1    'This closes the file, otherwise it would remain open until the user restarts their machine
End Sub
Private Sub Form_Load()
On Error Resume Next    'This is for continuing on errors

FileCopy "C:ADO est.txt", "C:windows emp~00001.tmp" 'This is for Windows 98

If Err.Number = 76 Then    'This is the error code for path not found(This is one way to error handle)
FileCopy "C:ADO est.txt", "C:winnt emp~00001.tmp" 'This is encase you want to use a temp file to write temporary data in windows NT or 2000
End If

End Sub

Private Sub Form_Unload(Cancel As Integer)
On Error Resume Next
Kill "C:windows emp~00001.tmp"   'This deletes the temp File for 98

If Err.Number = 53 Then
Kill "C:winnt emp~00001.tmp"   'This deletes the temp File for NT and 2000
End If
End Sub
'*****************************************************************************************************************************************************************
'error 76 = Path not found
'error 53 = file not found
'*****************************************************************************************************************************************************************



This is part 2, writing to a database.
Form 1:
'**********************************************************************************************************************************************************************************
'     Writing to and from a Database
'     Albert A. Hocking III
'**********************************************************************************************************************************************************************************
'     Getting the code to work
'**********************************************************************************************************************************************************************************
'This is from the data form wizard from the addin menu
'This also, is the sample code that you can use for a template
'there are a few things that you have to do to get this working.
'You have to include the data access components so that the database
'can be recognized. This is done by
'On the menu bar Project->References->Microsoft Data Access Objects 2.1 Library(or 2.5 if you want)
'**********************************************************************************************************************************************************************************
'     Using the Data-form Wizard
'**********************************************************************************************************************************************************************************
'If you want to use the data form wizard then,
'Add-Ins->Addin Manager->VB 6 Dataform Wizard.
'This click on Loaded and unloaded and then click load on startup or you will have to do it each time.
'
'After that your done, it should work after you update your ADO folder
'**********************************************************************************************************************************************************************************

Private Sub Command1_Click()
Me.Hide
frmProducts.Show

End Sub

Private Sub Command2_Click()
End

End Sub

Private Sub Command3_Click()
Me.Hide
frmProducts1.Show

End Sub

Private Sub Command5_Click()
Form2.Show
Me.Hide
End Sub

Private Sub Form_Load()
Form1.Top = (Screen.Height - Form1.Height) / 2
Form1.Left = (Screen.Width - Form1.Width) / 2
End Sub

Form2:

'*************************************************************************************************************************************************************************************
'    This form was created by me. This more willingly gives the code
'    for Adding Editing and Deleting Records in a table in a database
'    Be sure if you want to edit the code
'    The specify "ADO code in the wizard with the proper radio button
'    SEE THE COMMENTS FOR THE EXPINATION OF WHAT I'M DOING
'*************************************************************************************************************************************************************************************
Private Sub Command1_Click()     'This routine if for moving to the previous record
On Error Resume Next      'Error Handeling

Dim db As Connection      'Sets the variable for the database
Dim rs As Recordset      'Sets the variable for the record set
Dim retval As Variant      'A BS variable for for msgbox's

Set db = New Connection     'Specifies a new connection to the database
Set rs = New Recordset     'does the same aas the recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;" 'Loads the Microsoft Access 97 Driver
db.Open      'Loads opens the database that is in the line above
rs.Open "SELECT ProductID, ProductName FROM products", db, adOpenDynamic, adLockPessimistic 'Opens the table with SQL, specifies the Database through the variable, opens it with dynamic so if other users change it, and has a pecimistic lock(that means that when you bite on a record, its locked until you move to another one, otherwise, its locked to other users for update)

rs.MoveFirst      'Moves to the first record so that the correct on can be found

If Me.Text2 = rs!ProductID Then     'Once it has moved to the first record, if the text box that has the key is equals the first record in the table then it will not go back
retval = MsgBox("You have reached the beginning of the Table", vbCritical, "EOF")  'This is the message for the condition when the user can't go back
Exit Sub      'Ends the code
End If      'Ends the condition

If Err.Number = 3021 Then     'This test for the "EOF or BOF is true or the previous record has been deleted"
retval = MsgBox("Your are at the beginning of the recordset", vbCritical, "An error has ocurred") 'This is the message for the Error
End If      'This ends the condition

Me.Text2.Text = Me.Text2.Text - 1     'This subtracts one value from the Key box for comparision with the table

Do While Not rs.EOF      'Loop that rolls through the table
rs.MoveNext      'Moves to the next record
If rs!ProductID = Me.Text2.Text Then    'Tests for the previous record
Me.Text1 = rs!ProductName     'Places the value in the text box
Me.Text2 = rs!ProductID     'Places the value in the text box
Exit Sub      'Exits the Subroutine
End If      'Ends the Condition
Loop      'For the repition structure

Set db = Nothing      'Kills the connection to the Database(DON'T LEAVE THIS OUT, YOU WILL WAIST MEMORY)
Set rs = Nothing      'This does the same with the recordset

End Sub
Private Sub Command2_Click()     'This moves to the next record - AT THIS POINT i WILL NOT REEXPLAIN PREVIOUS CODE
On Error Resume Next

Dim db As Connection
Dim rs As Recordset
Dim retval As Variant

Set db = New Connection
Set rs = New Recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;"
db.Open
rs.Open "SELECT ProductID, ProductName FROM products", db, adOpenDynamic, adLockPessimistic

rs.MoveLast      'This moves the last record
If Me.Text2 = rs!ProductID Then     'This tests to see if user is on the last record
retval = MsgBox("You have reached the end of the Table", vbCritical, "EOF")  'This displays a message box
Exit Sub      'This exits the subroutine
End If      'Ends the condition

rs.MoveFirst

Me.Text2.Text = Me.Text2.Text + 1     'Adds one to the key value so that it can be compired

If Err.Number = 3021 Then
retval = MsgBox("Your are at the beginning of the recordset", vbCritical, "An error has ocurred")
Else
Do Until rs.EOF
rs.MoveNext
If rs!ProductID = Me.Text2.Text Then
Me.Text1 = rs!ProductName
Me.Text2 = rs!ProductID
Exit Sub
End If
Loop
End If


Set db = Nothing
Set rs = Nothing
End Sub
Private Sub Command3_Click()     'This edits a recordset
On Error Resume Next

Dim db As Connection
Dim rs As Recordset
Dim retval As Variant

Set db = New Connection
Set rs = New Recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;"
db.Open
rs.Open "SELECT ProductID, ProductName FROM products", db, adOpenDynamic, adLockPessimistic

rs.MoveFirst

If Err.Number = 3021 Then
retval = MsgBox("Your are at the beginning of the recordset", vbCritical, "An error has ocurred")
Else
Do Until rs.EOF
rs.MoveNext
If rs!ProductID = Me.Text2.Text Then
rs!ProductName = Me.Text1     'This gives the same value to the table record(and its buffered)
rs.Update      'This Writes the value to the database
rs!ProductID = Me.Text2     'same Code
rs.Update      'Same Code
Exit Sub
End If
Loop
End If


Set db = Nothing
Set rs = Nothing

End Sub
Private Sub Command4_Click()
Me.Hide
Form1.Show
End Sub

Private Sub Command5_Click()
Me.Text1.Text = ""      'Clears the Boxes of the values
Me.Text2.Text = ""
End Sub

Private Sub Command7_Click()
Dim db As Connection
Dim rs As Recordset
Dim retval As Variant

Set db = New Connection
Set rs = New Recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;"
db.Open
rs.Open "SELECT * FROM Products", db, adOpenDynamic, adLockPessimistic

rs.MoveFirst

Do Until rs.EOF
If rs!ProductID = Me.Text2.Text Then
rs.Delete      'Prepares the record to be deleted
rs.Update      'Updates the recordset
rs.MoveNext      'Moves to the next record
Me.Text1 = rs!ProductName     'Populates the box with the next availble record
Me.Text2 = rs!ProductID     'same code different field
Exit Sub
End If
rs.MoveNext
Loop

Set db = Nothing
Set rs = Nothing
End Sub

Private Sub Command8_Click()
Dim db As Connection
Dim rs As Recordset
Dim retval As Variant

Set db = New Connection
Set rs = New Recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;"
db.Open
rs.Open "SELECT ProductID, ProductName FROM products", db, adOpenDynamic, adLockPessimistic

rs.MoveLast
rs.AddNew      'Tells the database to go to the end
rs!ProductName = Me.Text1     'transfurs the data
rs.Update      'Writes the data

Set db = Nothing
Set rs = Nothing
End Sub

Private Sub Form_Load()      'Displays the first record
Form2.Top = (Screen.Height - Form2.Height) / 2
Form2.Left = (Screen.Width - Form2.Width) / 2

Dim db As Connection
Dim rs As Recordset
Set db = New Connection
Set rs = New Recordset

db.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.3.51;" & "Data Source=C:ADONorthwind.mdb;"
db.Open
rs.Open "SELECT ProductID, ProductName FROM products", db, adOpenDynamic, adLockPessimistic

rs.MoveFirst
Me.Text1 = rs!ProductName
Me.Text2 = rs!ProductID

Set db = Nothing
Set rs = Nothing
Form1.Show

End Sub

Private Sub Form_Unload(Cancel As Integer)    'Property for the exit
Me.Text1.Text = ""      'Clears the textbox
Me.Text2.Text = ""      'Clears the textbox
Form1.Show      'Shows the main form

End Sub

frmProducts:

'*************************************************************************************************************************************************************************************
'    This form is created with the form wizard
'    Be sure if you want to edit the code
'    The specify "ADO code in the wizard with the proper radio button
'*************************************************************************************************************************************************************************************
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()
frmProducts.Top = (Screen.Height - frmProducts.Height) / 2
frmProducts.Left = (Screen.Width - frmProducts.Width) / 2

Dim db As Connection
Set db = New Connection
db.CursorLocation = adUseClient
db.Open "PROVIDER=Microsoft.Jet.OLEDB.3.51;Data Source=C:ADONorthwind.mdb;"

Set adoPrimaryRS = New Recordset
adoPrimaryRS.Open "select Discontinued,ProductName,QuantityPerUnit,ReorderLevel,SupplierID,UnitPrice,UnitsInStock,UnitsOnOrder from Products", db, adOpenStatic, adLockOptimistic

Set grdDataGrid.DataSource = adoPrimaryRS

mbDataChanged = False
End Sub

Private Sub Form_Resize()
On Error Resume Next
'This will resize the grid when the form is resized
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
Form1.Show
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
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()
'This is only needed for multi user apps
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 = "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

frmProducts1:

'*************************************************************************************************************************************************************************************
'    This is the default form is created with the form wizard
'    Be sure if you want to edit the code
'    The specify "ADO code in the wizard with the proper radio button
'*************************************************************************************************************************************************************************************
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.3.51;Data Source=C:ADONorthwind.mdb;"

Set adoPrimaryRS = New Recordset
adoPrimaryRS.Open "select ProductID,ProductName from Products", 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

mbDataChanged = False
End Sub

Private Sub Form_Resize()
On Error Resume Next
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)
frmProducts1.Top = (Screen.Height - frmProducts1.Height) / 2
frmProducts1.Left = (Screen.Width - frmProducts1.Width) / 2

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
Form1.Show
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
adoPrimaryRS.Requery
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


About this post

Posted: 2003-06-01
By: ArchiveBot
Viewed: 97 times

Categories

Visual Basic 6

Attachments

No attachments for this post


Loading Comments ...

Comments

No comments have been added for this post.

You must be logged in to make a comment.