Sorry if my thread is place in incorrect forum.
Hai All ...
Could anybody help me? i'm praticing how to build the n'tier application. I have read some book tell about this, like "Building Client/Server Applications With VB.NET" by Jeff Levinson, beth massi video tutorial "building simple n-tier applications", and other else.
In my practice, i create 3 projects to handle each layer progress. That are DAL (Data Access Layer), BLL(Business Logic Layer) and UIL (User Interface Layer).
My problem is i don't want to use web service like beth massi do, and i don't want to use remote object like Jeff L do. So i decide to create it by my rules. Here above something that i do.
In DAL Section, I put all datasource like Beth Massi do over here. I also create a manager class like massi do to handle datasource over here. Also in this class, i create the UML structure of this datasource.
'SatuanManager.vb
Option Strict On
Option Explicit On
Imports TradingStudio.BLL.Structures
Imports TradingStudio.BLL.Interfaces
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Public Class SatuanManager
'Inherits MarshalByRefObject
Implements ISatuan
Public Sub Delete_Record(ByVal intUID As Integer) Implements BLL.Interfaces.ISatuan.Delete_Record
End Sub
Public Function Loading_Data() As BLL.DataSet_Satuan Implements BLL.Interfaces.ISatuan.Loading_Data
Dim ta As New DAL.DataSet_SatuanTableAdapters.UnitTableAdapter
Dim Satuan As New BLL.DataSet_Satuan
ta.FillByFlag(Satuan.Unit)
Return Satuan
End Function
Public Function Loading_Record(ByVal intUID As Integer) As BLL.Structures.Structure_Satuan Implements BLL.Interfaces.ISatuan.Loading_Record
End Function
Public Sub Save_Record(ByVal StrucSatuan As BLL.Structures.Structure_Satuan, ByRef intUID As Integer) Implements BLL.Interfaces.ISatuan.Save_Record
End Sub
#Region "Private Attributes"
Private paUnitUID As Integer
Private paUnitID As String
Private paUnitName As String
Private paUnitModerator As String
Private paUnitFlag As Boolean
Private paUnitModified As Date
#End Region
Public ReadOnly Property UnitUID() As Integer
Get
Return paUnitUID
End Get
End Property
Public ReadOnly Property UnitFlag() As Boolean
Get
Return paUnitFlag
End Get
End Property
Public ReadOnly Property UnitModified() As Date
Get
Return paUnitModified
End Get
End Property
Public Property UnitID() As String
Get
Return paUnitID
End Get
Set(ByVal value As String)
paUnitID = value
End Set
End Property
Public Property UnitName() As String
Get
Return paUnitName
End Get
Set(ByVal value As String)
paUnitName = value
End Set
End Property
Public Property UnitModerator() As String
Get
Return paUnitModerator
End Get
Set(ByVal value As String)
paUnitModerator = value
End Set
End Property
End ClassIn BLL Section, the dataset which i put in DAL Section auto generate over this section. I also create two class again in this section. There are Interfaces class and Structures class.
'Interfaces.vb
Option Strict On
Option Explicit On
Imports TradingStudio.BLL
Namespace Interfaces
Public Interface ISatuan
Function Loading_Data() As DataSet_Satuan
Function Loading_Record(ByVal intUID As Integer) As Structures.Structure_Satuan
Sub Save_Record(ByVal StrucSatuan As Structures.Structure_Satuan, ByRef intUID As Integer)
Sub Delete_Record(ByVal intUID As Integer)
End Interface
End Namespace'Structures.vb
Option Strict On
Option Explicit On
Namespace Structures
<Serializable()> Public Structure Structure_Satuan
'Public Structure Structure_Satuan
Public UnitUID As Integer
Public UnitID As String
Public UnitName As String
Public Moderator As String 'Sama Dengan Operator
Public Flag As Boolean
Public Modified As Date 'bisa juga dengan menggunakan byte()
End Structure
End NamespaceIn BLL Section, I build user form over here. Over this user form i create a datagridview to show the dataset rows.
'UI_Form.vb
Imports TradingStudio.BLL
Imports TradingStudio.DAL
Public Class Satuan_Main
Private Sub Satuan_Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim DataSatuan As New DAL.SatuanManager
Me.DataGridView1.DataSource = DataSatuan.Loading_Data.Unit
With Me.DataGridView1
.Columns("UnitUID").Visible = False
.Columns("Flag").Visible = False
.Columns("Modified").Visible = False
.ReadOnly = True
End With
End Sub
End ClassAnd Here above my complete source :
am i build a correct way of n-tier applications? where should i place user interface presentation? where should i place that uml object?
thank's
