OOP Inheritance
- From: "RSH" <way_beyond_oops@xxxxxxxxx>
- Date: Thu, 29 Mar 2007 10:26:02 -0400
Being rather new to OOP constructs I have a question regarding inheritance.
What is the proper way to setup my classes in a Company/Employee
relationship.
I have a Company Object and a company has employees (one to many
relationship) and CompanyDeductions. The Employees have EmployeeDeductions.
Based on my limited knowledge I set my objects as follows:
Public Class Company
Private _CompanyID As String
Private _Employees As New ArrayList
Private _Deductions As New ArrayList
Public Property CompanyID() As String
Get
Return _CompanyID
End Get
Set(ByVal Value As String)
_CompanyID = Value
End Set
End Property
Public ReadOnly Property Employees() As ArrayList
Get
Return _Employees
End Get
End Property
Public Sub LoadEmployees()
' Database call to get employees
Dim oDR As SqlClient.SqlDataReader
Dim oEmployee As New employee(oDR("EmployeeID"))
_Employees.Add(oEmployee)
End Sub
Public Sub LoadCompanyDeductions()
' Database call to get employees
Dim oDR As SqlClient.SqlDataReader
Dim oCompanyDeduction As New CompanyDeduction(oDR("DeductionID"))
_Employees.Add(oCompanyDeduction)
End Sub
End Class
Public Class Employee
Inherits Company
Private _EmployeeID As String
Private _FirstName As String
Private _LastName As String
Private _Deductions As ArrayList
Public Sub New(ByVal EmployeeID As String)
_EmployeeID = EmployeeID
End Sub
Public ReadOnly Property EmployeeID() As String
Get
Return _EmployeeID
End Get
End Property
Public ReadOnly Property FirstName() As String
Get
Return _FirstName
End Get
End Property
Public ReadOnly Property LastName() As String
Get
Return _LastName
End Get
End Property
Public Sub LoadEmployeeDeductions()
' Database call to get employees
Dim oDR As SqlClient.SqlDataReader
Dim oEmployeeDeduction As New EmployeeDeduction(oDR("DeductionID"))
_Deductions.Add(oEmployeeDeduction)
End Sub
End Class
Public Class CompanyDeduction
Inherits Company
Private _DeductionID As String
Private _DeductionName As String
Public Sub New(ByVal DeductionID As String)
_DeductionID = DeductionID
End Sub
Public ReadOnly Property DeductionID() As String
Get
Return _DeductionID
End Get
End Property
Public ReadOnly Property DeductionName() As String
Get
Return _DeductionName
End Get
End Property
End Class
Public Class EmployeeDeduction
Inherits Employee
Private _DeductionID As String
Private _DeductionName As String
Public Sub New(ByVal DeductionID As String)
_DeductionID = DeductionID
End Sub
Public ReadOnly Property DeductionID() As String
Get
Return _DeductionID
End Get
End Property
Public ReadOnly Property DeductionName() As String
Get
Return _DeductionName
End Get
End Property
End Class
Is this a good strategy? Or how could I make it better 9or more industry
standard?
Thank you for your time.
Ron
.
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