ITSM/_LCDokumente/DB/clsDBInteractionBase.vb

Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes

Namespace TKB.VV.DB
	Public Enum LLBLError
		AllOk
		' // Add more here (check the comma's!)
	End Enum


	Public Interface ICommonDBAccess
		Function	Insert() As Boolean
		Function	Update() As Boolean
		Function	Delete() As Boolean
		Function	SelectOne() As DataTable
		Function	SelectAll() As DataTable
	End Interface


	Public MustInherit Class clsDBInteractionBase
		Implements IDisposable
		Implements ICommonDBAccess

#Region " Class Member Declarations "

		Protected	m_scoMainConnection As SqlConnection
		Protected	m_iRowsAffected As Integer
		Protected	m_iErrorCode As SqlInt32
		Protected	m_bMainConnectionIsCreatedLocal As Boolean
		Protected	m_cpMainConnectionProvider As clsConnectionProvider
		Private		m_sConnectionString As String
		Private		m_bIsDisposed As Boolean

#End Region


		Public Sub New()
			' // Initialize the class' members.
			InitClass()
		End Sub


		Private Sub InitClass()
			' // create all the objects and initialize other members.
			m_scoMainConnection = new SqlConnection()
			m_bMainConnectionIsCreatedLocal = True
			m_cpMainConnectionProvider = Nothing
			m_iErrorCode = New SqlInt32(LLBLError.AllOk)
			m_bIsDisposed = False
		End Sub


		Overloads Public Sub Dispose() Implements IDisposable.Dispose
			Dispose(True)
			GC.SuppressFinalize(Me)
		End Sub


		Overridable  Overloads Protected Sub Dispose(ByVal bIsDisposing As Boolean)
			' // Check to see if Dispose has already been called.
			If Not m_bIsDisposed Then
				If bIsDisposing Then
					' // Dispose managed resources.
					If m_bMainConnectionIsCreatedLocal Then
						' // Object is created in this class, so destroy it here.
						m_scoMainConnection.Close()
						m_scoMainConnection.Dispose()
						m_bMainConnectionIsCreatedLocal = True
					End If
					m_cpMainConnectionProvider = Nothing
					m_scoMainConnection = Nothing
				End If
			End If
			m_bIsDisposed = True
		End Sub


		Public Overridable Function Insert() As Boolean Implements ICommonDBAccess.Insert
			' // No implementation, throw exception
			Throw New NotImplementedException()
		End Function


		Public Overridable Function Delete() As Boolean Implements ICommonDBAccess.Delete
			' // No implementation, throw exception
			Throw New NotImplementedException()
		End Function


		Public Overridable Function Update() As Boolean Implements ICommonDBAccess.Update
			' // No implementation, throw exception
			Throw New NotImplementedException()
		End Function


		Public Overridable Function SelectOne() As DataTable Implements ICommonDBAccess.SelectOne
			' // No implementation, throw exception
			Throw New NotImplementedException()
		End Function


		Public Overridable Function SelectAll() As DataTable Implements ICommonDBAccess.SelectAll
			' // No implementation, throw exception
			Throw New NotImplementedException()
		End Function


#Region " Class Property Declarations "

		Public WriteOnly Property cpMainConnectionProvider() As clsConnectionProvider
			Set(ByVal Value As clsConnectionProvider)
				If Value Is Nothing Then
					' // Invalid value
					Throw New ArgumentNullException("cpMainConnectionProvider", "Nothing passed as value to this property which is not allowed.")
				End If

				' // A connection provider object is passed to this class.
				' // Retrieve the SqlConnection object, if present and create a
				' // reference to it. If there is already a MainConnection object
				' // referenced by the membervar, destroy that one or simply 
				' // remove the reference, based on the flag.
				If Not (m_scoMainConnection Is Nothing) Then
					' // First get rid of current connection object. Caller is responsible
					If m_bMainConnectionIsCreatedLocal Then
						' // Is local created object, close it and dispose it.
						m_scoMainConnection.Close()
						m_scoMainConnection.Dispose()
					End If
					' // Remove reference.
					m_scoMainConnection = Nothing
				End If
				m_cpMainConnectionProvider = CType(Value, clsConnectionProvider)
				m_scoMainConnection = m_cpMainConnectionProvider.scoDBConnection
				m_bMainConnectionIsCreatedLocal = False
			End Set
		End Property


		Public ReadOnly Property iErrorCode() As SqlInt32
			Get
				Return m_iErrorCode
			End Get
		End Property


		Public Property sConnectionString() As String
			Get
				Return m_sConnectionString
			End Get
			Set (ByVal Value As String)
				m_sConnectionString = Value
				m_scoMainConnection.ConnectionString = m_sConnectionString
			End Set
		End Property
		Public Readonly Property iRowsAffected() As Integer
			Get
				Return m_iRowsAffected
			End Get
		End Property

#End Region

	End Class
End Namespace