The Business Logic Layer (BLL)

To build the Business Logic Layer we will:

• Alter "GuestBookInfo.vb"
• Alter "GuestBookController.vb"

And that's it! This is the step that is usually the hardest for beginners to understand but is really not that complicated. However, ASP.NET 2.0 does provide a major reduction of code over the ASP.NET 1.1 version.

Alter the "GuestBookInfo.vb" file

Imports System
Imports System.Configuration
Imports System.Data

Namespace YourCompany.Modules.GuestBook

Public Class GuestBookInfo

Private _ModuleId As Integer
Private _ID As Integer
Private _Name As String
Private _Email As String
Private _Message As String
Private _DateEntered As DateTime

' initialization

Public Sub New()
  MyBase.New()
End Sub

' <summary>
' Gets and sets the Module Id
' </summary>

Public Property ModuleId() As Integer
 Get
  Return _ModuleId
 End Get
Set(ByVal value As Integer)
  _ModuleId = value
 End Set
End Property

' <summary>
' Gets and sets the Item ID
' </summary>
Public Property ID() As Integer
 Get
  Return _ID
 End Get
 Set(ByVal value As Integer)
  _ID = value
 End Set
End Property

' <summary>
' gets and sets the Name
' </summary>
Public Property Name() As String
 Get
  Return _Name
 End Get
 Set(ByVal value As String)
  _Name = value
 End Set
End Property

' <summary>
' Gets and sets the Email
' </summary>
Public Property Email() As String
 Get
  Return _Email
 End Get
 Set(ByVal value As String)
  _Email = value
 End Set
End Property

' <summary>
' Gets and sets the Message
' </summary>
Public Property Message() As String
 Get
  Return _Message
 End Get
 Set(ByVal value As String)
  _Message = value
 End Set
End Property

' <summary>
' Gets and sets the DateEntered
' </summary>
Public Property DateEntered() As DateTime
 Get
  Return _DateEntered
 End Get
 Set(ByVal value As DateTime)
  _DateEntered = value
 End Set
 End Property

 End Class
End Namespace

Alter the "GuestBookController.vb" file

Imports System
Imports System.Collections.Generic
Imports System.Configuration
Imports System.ComponentModel
Imports System.Data
Imports System.Xml
Imports System.Web
Imports DotNetNuke
Imports DotNetNuke.Common
Imports DotNetNuke.Common.Utilities
Imports DotNetNuke.Entities.Modules
Imports DotNetNuke.Services.Search
 

Namespace YourCompany.Modules.GuestBook

 Public Class GuestBookController

  <DataObjectMethod(DataObjectMethodType.Insert)> _
  Public Shared Sub GuestBook_Insert(ByVal objTest As GuestBookInfo)
    DataProvider.Instance.YourCompany_GuestBook_Insert(objTest.ModuleId,   objTest.Name, objTest.Email, objTest.Message)
  End Sub

  <DataObjectMethod(DataObjectMethodType.Delete)> _
  Public Shared Sub GuestBook_Delete(ByVal objTest As GuestBookInfo)
    DataProvider.Instance.YourCompany_GuestBook_Delete(objTest.ID)
  End Sub

  <DataObjectMethod(DataObjectMethodType.Select)> _
  Public Shared Function GuestBook_GetAll(ByVal ModuleId As Integer) As List(Of   GuestBookInfo)
    Return CBO.FillCollection(Of GuestBookInfo)(DataProvider.Instance().YourCompany_GuestBook_GetAll(ModuleId))
  End Function

  <DataObjectMethod(DataObjectMethodType.Update)> _
  Public Shared Sub GuestBook_Update(ByVal objTest As GuestBookInfo)
    DataProvider.Instance.YourCompany_GuestBook_Update(objTest.ID,   objTest.Name, objTest.Email, objTest.Message, objTest.DateEntered)
  End Sub

 End Class
 

End Namespace

Review

• Data Access Layer (DAL) (Done)
• Business Logic Layer (BLL) (Done)
• Presentation Layer (UI)

We are done with the Business Logic Layer.

What did we just do?

The "GuestBookInfo.vb" was created. This is just a simple class file. It will hold the data

• GuestBook_Insert
  • Inserts items into the database. You pass a "GuestBookInfo" object to this method. The method then opens up the object and passes the individual parameters (ModuleId, Name, Email, Message) to the "YourCompany_GuestBook_Insert" method in the DataProvider.vb" file.
• GuestBook_Delete
  • Deletes items from the database. You pass a "GuestBookInfo" object to this method. The method then opens up the object and passes the individual parameter (ID) to the "YourCompany_GuestBook_Delete" method in the DataProvider.vb" file.
• GuestBook_GetAll
  • Gets a recordset from the database. You pass a "ModuleId" parameter to this method. The method calls the "YourCompany_GuestBook_GetAll" method in the  DataProvider.vb" file and returns a "GuestBookInfo" object filled with data.
• GuestBook_Update
  • Updates the database. You pass a "GuestBookInfo" object to this method. The method then opens up the object and passes the individual parameters (ID, ModuleId, Name, Email, Message, DateEntered) to the "YourCompany_GuestBook_Update" method in the DataProvider.vb" file.

A Lot Of Stuff Was Deleted

You may notice that a lot of code was deleted out of the "GuestBookController.vb" file. Some of this was the optional interfaces that handle exporting data and searching. These are interfaces that you will want to read about and implement in your modules. However, they are not required and they are left out for simplicity.

A lot of code was eliminated by using code that is exclusive to ASP.NET 2.0 and incompatible with ASP.NET 1.1. ASP.NET 2.0 really saves you a lot of work and requires less code.

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Next: The Presentation Layer (UI)