steps to connect vb and oracle

8/7/2019 Steps to Connect VB and Oracle

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Steps to Connect

Visual Basic & Oracle

A tutorial by

B.BHUVANESWARANLecturer / CSE

Rajalakshmi Engineering College

Thandalam, Chennai – 602 105

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Steps to Connect Visual Basic & Oracle

1. Select SQL Plus from the Start menu.

2. Enter the User Name, Password and Host String.

3. Create the table (eg. Employee).



4. Select the Microsoft Visual Basic 6.0 from the Start menu.

5. Select the Project type as Standard EXE and click Open.



6. Create the form with relevant controls.

Control Name

Text Box txtEmpCode

Text Box txtEname

Option Button optMale

Option Button optFemaleDTPicker dtpDob

Combo Box cboDesig

Combo Box cboDept

Text Box txtSalary

Command Button cmdAdd

Command Button cmdView

Command Button cmdEdit

Command Button cmdDelete

Command Button cmdClear

Command Button cmdExit

7. For placing the DTPicker control, go to Project Components (or) press Ctrl+T and

select the Microsoft Windows Common Controls-2.6.0 (SP3) from the Components and

click OK to place in the Toolbox.



8. Now the form look like as follows.

9. Change the form name as frmEmployee and project name as prjEmployee.

10. Place the ADO Data Control by selection the Project Components (or) by pressing

Ctrl+T.



11. From the list of available components check the Microsoft ADO Data Control 6.0 (SP3)

(OLEDB).

12. From the Toolbox double click the Adodc control to place in the form.

13. Select the Adodc and right click. Then select ADODC Properties.



14. In the Property Pages dialog box click the Use Connection String radio button and click

the Build button.

15. It opens the Data Link Properties dialog box. In that select the Microsoft OLE DB

Provider for Oracle and click Next.



16. Enter the Server Name, User Name and Password correctly. Make the Allow Saving

Password box as checked and click Test Connection.

17. If it displays the “Test Connection Succeeded” message, then click OK.

18. Copy the text available in the Use Connection String text box.



19. Double click the form and place the cursor at the top of the code window and press enter.

Now we get General Declaration section. Declare the following variables.

Dim connEmp As ADODB.Connection

Dim rsEmp As ADODB.Recordset

20. Double click the form, it loads the Form Load event and enter the following code.

Private Sub Form_Load()

Set connEmp = New ADODB.Connection

connEmp.Open "Provider=MSDAORA.1;Password=baba;User ID=baba;Data

Source=IBMREC;Persist Security Info=True"

connEmp.CursorLocation = adUseClient

MsgBox "Connection Established..."

cmdClear_Click

End Sub

21. Your code is look like as following.

22. Run the program by clicking the Start button (or) by pressing F5 button. The program

will display the following message box.

23. Double click the Clear button and enter the following code.

Private Sub cmdClear_Click()

txtEmpCode.Text = ""

txtEname.Text = ""

optMale.Value = False

optFemale.Value = False

cboDesig.Text = ""

cboDept.Text = ""

txtSalary.Text = ""

End Sub



24. Double click the Add button and enter the following code.

Private Sub cmdAdd_Click()

Set rsEmp = New ADODB.Recordset

rsEmp.Open "select * from employee where empcode = '" &

txtEmpCode.Text & "'", connEmp, adOpenKeyset,

adLockReadOnly, adCmdText

If rsEmp.RecordCount <> 0 Then

MsgBox "Employee Code Already Exists..."rsEmp.Close

Set rsEmp = Nothing

Exit Sub

Else


rsEmp.Open "select * from employee", connEmp, adOpenKeyset,

adLockPessimistic, adCmdText

rsEmp.AddNew

rsEmp!Empcode = Trim(txtEmpCode.Text)

rsEmp!Ename = Trim(txtEname.Text)

If optMale.Value = True Then

rsEmp!Gender = "Male"

ElseIf optFemale.Value = True Then

rsEmp!Gender = "Female"

End If

rsEmp!Dob = dtpDob.Value

rsEmp!Desig = Trim(cboDesig.Text)

rsEmp!Dept = Trim(cboDept.Text)

rsEmp!Salary = Val(Trim(txtSalary.Text))

rsEmp.Update

connEmp.Execute "commit"

rsEmp.Close

Set rsEmp = Nothing

MsgBox "Added Succesfully..."

cmdClear_Click

End If

End Sub

25. Double click the View button and enter the following code.

Private Sub cmdView_Click()



txtEmpCode.Text & "'", connEmp, adOpenKeyset, adLockReadOnly,

adCmdText


txtEname.Text = Trim(rsEmp!Ename)

If Trim(rsEmp!Gender) = "Male" Then

optMale.Value = True

ElseIf Trim(rsEmp!Gender) = "Female" Then

optFemale.Value = True

End If

dtpDob.Value = rsEmp!DobcboDesig.Text = Trim(rsEmp!Desig)

cboDept.Text = Trim(rsEmp!Dept)

txtSalary.Text = Val(rsEmp!Salary)

MsgBox "Viewed Succesfully..."

Else

MsgBox "Employee Code Not Exists..."

End If

rsEmp.Close

Set rsEmp = Nothing

End Sub



26. Double click the Delete button and enter the following code.

Private Sub cmdDelete_Click()

If (MsgBox("Are you sure to delete...", vbYesNo) = vbYes) Then



txtEmpCode.Text & "'", connEmp, adOpenKeyset, adLockPessimistic,

adCmdText

rsEmp.DeleteconnEmp.Execute "commit"

rsEmp.Close

Set rsEmp = Nothing

MsgBox "Deleted Succesfully..."

cmdClear_Click

End If

End Sub

27. Double click the Edit button and enter the following code.

Private Sub cmdEdit_Click()

If (MsgBox("Are you sure to edit...", vbYesNo) = vbYes) Then


rsEmp.Open "select * from employee where empcode = '" &txtEmpCode.Text & "'", connEmp, adOpenKeyset, adLockPessimistic,

adCmdText







End If





rsEmp.Update


rsEmp.Close

Set rsEmp = Nothing

MsgBox "Edited Succesfully..."

cmdClear_Click

End If

End Sub



28. Run the program and enter the values.

29. Click the Add button, the program displays the following Message box.

30. To see whether the values are added in the database or not, view the rows by entering the

SQL, and type select * from employee ;, the SQL displays the added record values.



31. To edit any record, clear the values by clicking the clear button and enter the Employee

Code in the text box and click View. If the record is available in the database it will display

the following message box.

32. If you want to change any value, edit it and click Edit button, then it will display the

following confirmation Message box.

33. Click Yes to change and No to remain previous values. If the selection is Yes, it displays

the following Message box.

34. To delete any record, clear the values by clicking the clear button and enter the Employee

Code in the text box and click View. If the record is available in the database it will display

the following message box.

35. If you want to delete click Delete button, then it will display the following confirmation

Message box.



36. Click Yes to delete and No to retain the record. If the selection is Yes, it displays the

following Message box.

37. Save the Form.

38. Save the Project.



39. Select No for adding project to SourceSafe.

40. To create an Executable file for this Project, select FileMake prjEmployee.exe.

41. Select the path to store the Executable file and click OK.



Full Code

Dim connEmp As ADODB.Connection

Dim rsEmp As ADODB.Recordset

Private Sub cmdAdd_Click()


rsEmp.Open "select * from employee where empcode = '" &txtEmpCode.Text & "'", connEmp, adOpenKeyset,

adLockReadOnly, adCmdText


MsgBox "Employee Code Already Exists..."

rsEmp.Close

Set rsEmp = Nothing

Exit Sub

Else


rsEmp.Open "select * from employee", connEmp, adOpenKeyset,

adLockPessimistic, adCmdText

rsEmp.AddNew







End If





rsEmp.Update


rsEmp.Close

Set rsEmp = Nothing

MsgBox "Added Succesfully..."

cmdClear_ClickEnd If

End Sub

Private Sub cmdClear_Click()

txtEmpCode.Text = ""

txtEname.Text = ""

optMale.Value = False

optFemale.Value = False

cboDesig.Text = ""

cboDept.Text = ""

txtSalary.Text = ""

End Sub



Private Sub cmdDelete_Click()

If (MsgBox("Are you sure to delete...", vbYesNo) = vbYes) Then




adCmdText

rsEmp.Delete


rsEmp.Close

Set rsEmp = NothingMsgBox "Deleted Succesfully..."

cmdClear_Click

End If

End Sub

Private Sub cmdEdit_Click()

If (MsgBox("Are you sure to edit...", vbYesNo) = vbYes) Then




adCmdText

rsEmp!Empcode = Trim(txtEmpCode.Text)rsEmp!Ename = Trim(txtEname.Text)





End If





rsEmp.Update


rsEmp.Close

Set rsEmp = Nothing

MsgBox "Edited Succesfully..."

cmdClear_Click

End If

End Sub

Private Sub cmdExit_Click()

End

End Sub



Private Sub cmdView_Click()



txtEmpCode.Text & "'", connEmp, adOpenKeyset, adLockReadOnly,

adCmdText


txtEname.Text = Trim(rsEmp!Ename)

If Trim(rsEmp!Gender) = "Male" Then

optMale.Value = True

ElseIf Trim(rsEmp!Gender) = "Female" ThenoptFemale.Value = True

End If

dtpDob.Value = rsEmp!Dob

cboDesig.Text = Trim(rsEmp!Desig)

cboDept.Text = Trim(rsEmp!Dept)

txtSalary.Text = Val(rsEmp!Salary)

MsgBox "Viewed Succesfully..."

Else

MsgBox "Employee Code Not Exists..."

End If

rsEmp.Close

Set rsEmp = Nothing

End Sub

Private Sub Form_Load()

Set connEmp = New ADODB.Connection

connEmp.Open "Provider=MSDAORA.1;Password=baba;User ID=baba;Data

Source=IBMREC;Persist Security Info=True"

connEmp.CursorLocation = adUseClient

MsgBox "Connection Established..."

cmdClear_Click

End Sub



More About Cursor Types

CursorTypeEnum Values

Constant Value Description

adOpenUnspecified -1 Does not specify the type of cursor.

adOpenForwardOnly 0 Default. Uses a forward-only cursor. Identical to a static

cursor, except that you can only scroll forward through

records. This improves performance when you need to make

only one pass through a Recordset.

adOpenKeyset 1 Uses a keyset cursor. Like a dynamic cursor, except that you

can't see records that other users add, although records that

other users delete are inaccessible from your Recordset. Data

changes by other users are still visible.

adOpenDynamic 2 Uses a dynamic cursor. Additions, changes, and deletions by

other users are visible, and all types of movement through the

Recordset are allowed, except for bookmarks, if the provider

doesn't support them.

adOpenStatic 3 Uses a static cursor. A static copy of a set of records that you

can use to find data or generate reports. Additions, changes,

or deletions by other users are not visible.

LockTypeEnum Values

Constant Value Description

adLockUnspecified -1 Unspecified type of lock. Clones inherits lock

type from the original Recordset.

adLockReadOnly 1 Read-only records

adLockPessimistic 2 Pessimistic locking, record by record. The

provider lock records immediately after editing

adLockOptimistic 3 Optimistic locking, record by record. The

provider lock records only when calling update

adLockBatchOptimistic 4 Optimistic batch updates. Required for batch

update mode

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