Catch Duplicate Entry in Visual Basic 6 and Microsoft Access

Here is a sample program that is being provided by my close friend, business partner and fellow software engineer Sir Larry Dave Emol. He created this program using Microsoft Visual Basic 6 and Microsoft Access to Catch Duplicate Entry in the database.

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Sample Program Output

Program Listing

FORM CODES

Private Sub Command1_Click()

    If Text1.Text = "" Or Text2.Text = "" Or Text3.Text = "" Or Text4.Text = "" Then

        msgbox.Caption = "? Please complete the data fields"

    Else

        Call SQLDB(Me.AdoCon, "SELECT * From tblinfo where FIRSTNAME like'" & Me.Text1.Text & "' and MIDDLENAME like'" & Me.Text2.Text & "' and LASTNAME like'" & Me.Text3.Text & "'")

        If Me.AdoCon.Recordset.RecordCount = 1 Then

        msgbox.Caption = "? Duplicate Entry" & " " & Me.Text1.Text & " " & Me.Text2.Text & " " & Me.Text3.Text & " " & Me.Tag

        Exit Sub

        End If

        

        Call SQLDB(Me.AdoCon, "Select * From tblInfo")

          With Me.AdoCon.Recordset

                  .AddNew

                  .Fields(1) = Text1.Text

                  .Fields(2) = Text2.Text

                  .Fields(3) = Text3.Text

                  .Fields(4) = Text4.Text

                 .Update

           End With

           Me.Text1.Text = ""

           Me.Text2.Text = ""

           Me.Text3.Text = ""

           Me.Text4.Text = ""

    End If

End Sub

Module Codes(Database Connection)

Option Explicit

Public Function AppDir() As String

    If Right$(App.Path, 1) = "\" Then

        AppDir = App.Path

    Else

        AppDir = App.Path & "\"

    End If

End Function

Public Sub SQLDB(adoObj As Adodc, AdoRec As String) 'for SQL Recordsource

    'Loads the database and provides the database password

    adoObj.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & AppDir & "Tutorial.mdb;Persist Security Info=False;Jet OLEDB:Database Password = "

    

    'Sets the command type to Table

    adoObj.CommandType = adCmdText

    

    'Loads the source table of info

    adoObj.RecordSource = AdoRec

    'refreshes database status

     adoObj.Refresh

End Sub

DOWNLOAD SOURCE CODE HERE