Creating VB database applications using ADO control

However, data control is not a very flexible tool because it could work only with limited kinds of data and must work strictly in the Visual Basic environment.We can use a much more powerful data control in VB known as ADO control to overcome these limitations. ADO stands for ActiveX data objects and as ADO is ActiveX-based, it could work in different platforms (different computer systems) and different programming languages. Besides, it could access many different kinds of data such as data displayed in the Internet browsers, email text and even graphics other than usual relational and non relational database information.

To be able to use ADO data control, you need to insert it into the toolbox and to do this, simply press Ctrl+T to open the components dialog box and select Microsoft ActiveX Data Control 6. After this only, you can proceed to build your ADO-based VB database applications.

The following example will illustrate how to build a relatively powerful database application using ADO data control and first of all, name the new form as frmBookTitle and change its caption to Book Tiles- ADO Application. Secondly, insert the ADO data control and name it as adoBooks and change its caption to book and next, insert the necessary labels, text boxes and command buttons. The runtime interface of this program is shown in the diagram below and it allows adding and deletion as well as updating and browsing of data.

Steps to build the database application using ADO

Step1:The properties of all the controls are listed as follow:

Form Name	frmBookTitle
Form Caption	Book Titles -ADOApplication
ADO Name	adoBooks
Label1 Name	lblApp
Label1 Caption	Book Titles
Label 2 Name	lblTitle
Label2 Caption	Title :
Label3 Name	lblYear
Label3 Caption	Year Published:
Label4 Name	lblISBN
Label4 Caption	ISBN:
Labe5 Name	lblPubID
Label5 Caption	Publisher's ID:
Label6 Name	lblSubject
Label6 Caption	Subject :
TextBox1 Name	txtitle
TextBox1 DataField	Title
TextBox1 DataSource	adoBooks
TextBox2 Name	txtPub
TextBox2 DataField	Year Published
TextBox2 DataSource	adoBooks
TextBox3 Name	txtISBN
TextBox3 DataField	ISBN
TextBox3 DataSource	adoBooks
TextBox4 Name	txtPubID
TextBox4 DataField	PubID
TextBox4 DataSource	adoBooks
TextBox5 Name	txtSubject
TextBox5 DataField	Subject
TextBox5 DataSource	adoBooks
Command Button1 Name	cmdSave
Command Button1 Caption	&Save
Command Button2 Name	cmdAdd
Command Button2 Caption	&Add
Command Button3 Name	cmdDelete
Command Button3 Caption	&Delete
Command Button4 Name	cmdCancel
Command Button4 Caption	&Cancel
Command Button5 Name	cmdPrev
Command Button5 Caption	&<
Command Button6 Name	cmdNext
Command Button6 Caption	&>
Command Button7 Name	cmdExit
Command Button7 Caption	E&xit

Step2:

To be able to manage and access a database, you need to connect the ADO data control to a database file. We are going to use BIBLIO.MDB that comes with VB6 and to connect ADO to this database file , follow the steps below:
a) Click on the ADO control on the form and then open up the properties window.
b) Click on the ConnectionString property, the following dialog box will appear.

step3:

when the dialog box appear, select the Use Connection String's Option and next, click build and at the Data Link dialog box, double-Click the option labeled Microsoft Jet 3.51 OLE DB provider.

Step4:

After that, click the Next button to select the file BIBLO.MDB and you can click on Text Connection to ensure proper connection of the database file. Click OK to finish the connection.

Finally, click on the RecordSource property and set the command type to adCmd Table and Table name to Titles and now you are really to use the database file.

Step5:

Now, you need to write code for all the command buttons and after which, you can make the ADO control invisible.

For the Save button, the program codes are as follow:

Private Sub cmdSave_Click()
adoBooks.Recordset.Fields("Title") = txtTitle.Text
adoBooks.Recordset.Fields("Year Published") = txtPub.Text
adoBooks.Recordset.Fields("ISBN") = txtISBN.Text
adoBooks.Recordset.Fields("PubID") = txtPubID.Text
adoBooks.Recordset.Fields("Subject") = txtSubject.Text
adoBooks.Recordset.Update

End Sub

For the Add button, the program codes are as follow:

Private Sub cmdAdd_Click()

adoBooks.Recordset.AddNew

End Sub

For the Delete button, the program codes are as follow:

Private Sub cmdDelete_Click()
Confirm = MsgBox("Are you sure you want to delete this record?", vbYesNo, "Deletion Confirmation")
If Confirm = vbYes Then
adoBooks.Recordset.Delete
MsgBox "Record Deleted!", , "Message"
Else
MsgBox "Record Not Deleted!", , "Message"
End If

End Sub

For the Cancel button, the program codes are as follow:

Private Sub cmdCancel_Click()

txtTitle.Text = ""
txtPub.Text = ""
txtPubID.Text = ""
txtISBN.Text = ""
txtSubject.Text = ""

End Sub

For the Previous (<) button, the program codes are

Private Sub cmdPrev_Click()

If Not adoBooks.Recordset.BOF Then
adoBooks.Recordset.MovePrevious
If adoBooks.Recordset.BOF Then
adoBooks.Recordset.MoveNext
End If
End If

End Sub

For the Next(>) button, the program codes are

Private Sub cmdNext_Click()

If Not adoBooks.Recordset.EOF Then
adoBooks.Recordset.MoveNext
If adoBooks.Recordset.EOF Then
adoBooks.Recordset.MovePrevious
End If
End If

End Sub

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