As mentioned above, not only people who have computer background can create a programmed application but a computer hobbyist can also become a programmer. Why? Because the Vendor of Visual Basic Programming provides a Wizard that helps users to create a programmed application. All you need to know is the steps of how to operate the Wizard to develop an application.
The application discussed here is called Author, where the database file being used is called Biblio.
Let’s start to create a new application by using Visual Basic Programming. Let’s name this project as Biblio.vbp. The database file used is called Biblio.mvb which is placed in the C:\Program Files\Microsoft Visual Studio. The purpose of creating an Author application is that users can enter author data and save them into Biblio database.
The task is started when a new project is opened, then the program can be created by using Wizard. The name of the program to be created is Author and the name of the form is called FormAuthors.
There are two stages of the task of developing an Authors program. They are
Creating program by using Wizard
Running program
1. Create Program By Using Wizard
Picture 1: Create a New Form
Picture 2: Choice The Form VB Data Form Wizard
Choose one type of the form. In this session it is assumed that you have selected the form VB Data Form Wizard by double clicking it.
Picture 3: Data FormWizard – Introduction
The Data Form Wizard will help you create a form with objects bound to a local or remote data source.
Wizard will display FormAutor.rwp. Now you can click the dot icon if you want to use the others. After that click Next.
Picture 4: Data FormWizard – Database Type
Select a database formats from the list that are Microsoft Access or Remote Access. Click Next.
Picture 5: Data Form Wizard – Database
Click the browse button to select a database file. Then click the Browse button again to find a database. After that select a BIBLIO.MDB that is a default database. You can find it on the C:\Program Files\Microsoft Visual Studio folder. Click Next.
Picture 6: Data Form Wizard – Form
Select the desired form type and a data binding type to use to access the data. Fill in “FormAuthors” on the question What name do you want for the form ?. Select a Master/Detail Form layout. Select a ADO Code binding type. Click Next
Picture 7: Data Form Wizard – Master Record Source
Select the record source and fields for the Master section of the Master/Detail form. The Master section displays one record at a time. Assumed that you have chosen an Author record source. Click the right double arrow to move all fields to the right. Click next.
Picture 8: Data Form Wizard – Detail Record Source
Select a record source for the Detail Section of the Master/Detail Form, and then select the fields to use. Click Next
Picture 9: Data Form Wizard – Record Source Relation
Select a field from each record source that links the two sources together. Click field Au_ID on the Master and Detail. Click next.
Picture 10: Data Form Wizard – Control Selection
Select the desired controls to place on the form, Click Next
Picture 11: Data Form Wizard – Finised
Select the FormAuthor.rwp in the question To what profile do you want to save your settings ? click Finish..
Picture 12: Form Authors
2. Running Biblio.vbp program
In this step, you have been successful to create a new form with the help of the Wizard.
When the Authors Visual basic programming is running as appears in the picture 12. How to operate it ?. By using the form you can input Authors data into the BIBLIO.MDB database file. There are two parts of the form. One, a part of the Authors Form that is used to input the Authors data and the other to view data.
Picture 13: Running Form Authors
Authors Visual Basic Programming Code.
You can see the code of the following FormAuthors program. The Wizard has generated the code by himself, without your being aware of it.
.
You can also write the following code without the help of Wizard, and the result will be the same.
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:\Program Files\Microsoft Visual Studio\VB98\BIBLIO.MDB;"
Set adoPrimaryRS = New Recordset
adoPrimaryRS.Open "select Au_ID,Author,[Year Born] from Authors", 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)
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
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
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