dsworker.vb

vb。net 2003数据库设计整套源代码

        Public Event workerRowDeleting As workerRowChangeEventHandler
        
        Public Overloads Sub AddworkerRow(ByVal row As workerRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddworkerRow(ByVal wno As String, ByVal wname As String, ByVal title As String, ByVal age As Integer) As workerRow
            Dim rowworkerRow As workerRow = CType(Me.NewRow,workerRow)
            rowworkerRow.ItemArray = New Object() {wno, wname, title, age}
            Me.Rows.Add(rowworkerRow)
            Return rowworkerRow
        End Function
        
        Public Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
            Return Me.Rows.GetEnumerator
        End Function
        
        Public Overrides Function Clone() As DataTable
            Dim cln As workerDataTable = CType(MyBase.Clone,workerDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New workerDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnwno = Me.Columns("wno")
            Me.columnwname = Me.Columns("wname")
            Me.columntitle = Me.Columns("title")
            Me.columnage = Me.Columns("age")
        End Sub
        
        Private Sub InitClass()
            Me.columnwno = New DataColumn("wno", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnwno)
            Me.columnwname = New DataColumn("wname", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnwname)
            Me.columntitle = New DataColumn("title", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columntitle)
            Me.columnage = New DataColumn("age", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnage)
        End Sub
        
        Public Function NewworkerRow() As workerRow
            Return CType(Me.NewRow,workerRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New workerRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(workerRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.workerRowChangedEvent) Is Nothing) Then
                RaiseEvent workerRowChanged(Me, New workerRowChangeEvent(CType(e.Row,workerRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.workerRowChangingEvent) Is Nothing) Then
                RaiseEvent workerRowChanging(Me, New workerRowChangeEvent(CType(e.Row,workerRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.workerRowDeletedEvent) Is Nothing) Then
                RaiseEvent workerRowDeleted(Me, New workerRowChangeEvent(CType(e.Row,workerRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.workerRowDeletingEvent) Is Nothing) Then
                RaiseEvent workerRowDeleting(Me, New workerRowChangeEvent(CType(e.Row,workerRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveworkerRow(ByVal row As workerRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class workerRow
        Inherits DataRow
        
        Private tableworker As workerDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableworker = CType(Me.Table,workerDataTable)
        End Sub
        
        Public Property wno As String
            Get
                Try 
                    Return CType(Me(Me.tableworker.wnoColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableworker.wnoColumn) = value
            End Set
        End Property
        
        Public Property wname As String
            Get
                Try 
                    Return CType(Me(Me.tableworker.wnameColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableworker.wnameColumn) = value
            End Set
        End Property
        
        Public Property title As String
            Get
                Try 
                    Return CType(Me(Me.tableworker.titleColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableworker.titleColumn) = value
            End Set
        End Property
        
        Public Property age As Integer
            Get
                Try 
                    Return CType(Me(Me.tableworker.ageColumn),Integer)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableworker.ageColumn) = value
            End Set
        End Property
        
        Public Function IswnoNull() As Boolean
            Return Me.IsNull(Me.tableworker.wnoColumn)
        End Function
        
        Public Sub SetwnoNull()
            Me(Me.tableworker.wnoColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IswnameNull() As Boolean
            Return Me.IsNull(Me.tableworker.wnameColumn)
        End Function
        
        Public Sub SetwnameNull()
            Me(Me.tableworker.wnameColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IstitleNull() As Boolean
            Return Me.IsNull(Me.tableworker.titleColumn)
        End Function
        
        Public Sub SettitleNull()
            Me(Me.tableworker.titleColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsageNull() As Boolean
            Return Me.IsNull(Me.tableworker.ageColumn)
        End Function
        
        Public Sub SetageNull()
            Me(Me.tableworker.ageColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class workerRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As workerRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As workerRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As workerRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
End Class