dataset1.vb

这是我用VB和SQL制作的教材购销系统,希望大家提出宝贵意见.

        
        Public Sub New(ByVal row As jcclRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As jcclRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class xsysDataTable
        Inherits DataTable
        Implements System.Collections.IEnumerable
        
        Private column书名 As DataColumn
        
        Private column姓名 As DataColumn
        
        Private column数量 As DataColumn
        
        Private column书号 As DataColumn
        
        Private column单价 As DataColumn
        
        Private column总价 As DataColumn
        
        Friend Sub New()
            MyBase.New("xsys")
            Me.InitClass
        End Sub
        
        Friend Sub New(ByVal table As DataTable)
            MyBase.New(table.TableName)
            If (table.CaseSensitive <> table.DataSet.CaseSensitive) Then
                Me.CaseSensitive = table.CaseSensitive
            End If
            If (table.Locale.ToString <> table.DataSet.Locale.ToString) Then
                Me.Locale = table.Locale
            End If
            If (table.Namespace <> table.DataSet.Namespace) Then
                Me.Namespace = table.Namespace
            End If
            Me.Prefix = table.Prefix
            Me.MinimumCapacity = table.MinimumCapacity
            Me.DisplayExpression = table.DisplayExpression
        End Sub
        
        <System.ComponentModel.Browsable(false)>  _
        Public ReadOnly Property Count As Integer
            Get
                Return Me.Rows.Count
            End Get
        End Property
        
        Friend ReadOnly Property 书名Column As DataColumn
            Get
                Return Me.column书名
            End Get
        End Property
        
        Friend ReadOnly Property 姓名Column As DataColumn
            Get
                Return Me.column姓名
            End Get
        End Property
        
        Friend ReadOnly Property 数量Column As DataColumn
            Get
                Return Me.column数量
            End Get
        End Property
        
        Friend ReadOnly Property 书号Column As DataColumn
            Get
                Return Me.column书号
            End Get
        End Property
        
        Friend ReadOnly Property 单价Column As DataColumn
            Get
                Return Me.column单价
            End Get
        End Property
        
        Friend ReadOnly Property 总价Column As DataColumn
            Get
                Return Me.column总价
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As xsysRow
            Get
                Return CType(Me.Rows(index),xsysRow)
            End Get
        End Property
        
        Public Event xsysRowChanged As xsysRowChangeEventHandler
        
        Public Event xsysRowChanging As xsysRowChangeEventHandler
        
        Public Event xsysRowDeleted As xsysRowChangeEventHandler
        
        Public Event xsysRowDeleting As xsysRowChangeEventHandler
        
        Public Overloads Sub AddxsysRow(ByVal row As xsysRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddxsysRow(ByVal 书名 As String, ByVal 姓名 As String, ByVal 数量 As Integer, ByVal 书号 As String, ByVal 单价 As Decimal, ByVal 总价 As Decimal) As xsysRow
            Dim rowxsysRow As xsysRow = CType(Me.NewRow,xsysRow)
            rowxsysRow.ItemArray = New Object() {书名, 姓名, 数量, 书号, 单价, 总价}
            Me.Rows.Add(rowxsysRow)
            Return rowxsysRow
        End Function
        
        Public Function FindBy书号(ByVal 书号 As String) As xsysRow
            Return CType(Me.Rows.Find(New Object() {书号}),xsysRow)
        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 xsysDataTable = CType(MyBase.Clone,xsysDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New xsysDataTable
        End Function
        
        Friend Sub InitVars()
            Me.column书名 = Me.Columns("书名")
            Me.column姓名 = Me.Columns("姓名")
            Me.column数量 = Me.Columns("数量")
            Me.column书号 = Me.Columns("书号")
            Me.column单价 = Me.Columns("单价")
            Me.column总价 = Me.Columns("总价")
        End Sub
        
        Private Sub InitClass()
            Me.column书名 = New DataColumn("书名", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column书名)
            Me.column姓名 = New DataColumn("姓名", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column姓名)
            Me.column数量 = New DataColumn("数量", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column数量)
            Me.column书号 = New DataColumn("书号", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column书号)
            Me.column单价 = New DataColumn("单价", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column单价)
            Me.column总价 = New DataColumn("总价", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column总价)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.column书号}, true))
            Me.column书号.AllowDBNull = false
            Me.column书号.Unique = true
        End Sub
        
        Public Function NewxsysRow() As xsysRow
            Return CType(Me.NewRow,xsysRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New xsysRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(xsysRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.xsysRowChangedEvent) Is Nothing) Then
                RaiseEvent xsysRowChanged(Me, New xsysRowChangeEvent(CType(e.Row,xsysRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.xsysRowChangingEvent) Is Nothing) Then
                RaiseEvent xsysRowChanging(Me, New xsysRowChangeEvent(CType(e.Row,xsysRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.xsysRowDeletedEvent) Is Nothing) Then
                RaiseEvent xsysRowDeleted(Me, New xsysRowChangeEvent(CType(e.Row,xsysRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.xsysRowDeletingEvent) Is Nothing) Then
                RaiseEvent xsysRowDeleting(Me, New xsysRowChangeEvent(CType(e.Row,xsysRow), e.Action))
            End If
        End Sub
        
        Public Sub RemovexsysRow(ByVal row As xsysRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class xsysRow
        Inherits DataRow
        
        Private tablexsys As xsysDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tablexsys = CType(Me.Table,xsysDataTable)
        End Sub
        
        Public Property 书名 As String
            Get
                Try 
                    Return CType(Me(Me.tablexsys.书名Column),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.tablexsys.书名Column) = value
            End Set
        End Property
        
        Public Property 姓名 As String
            Get
                Try 
                    Return CType(Me(Me.tablexsys.姓名Column),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.tablexsys.姓名Column) = value
            End Set
        End Property
        
        Public Property 数量 As Integer
            Get
                Try 
                    Return CType(Me(Me.tablexsys.数量Column),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.tablexsys.数量Column) = value
            End Set
        End Property
        
        Public Property 书号 As String
            Get
                Return CType(Me(Me.tablexsys.书号Column),String)
            End Get
            Set
                Me(Me.tablexsys.书号Column) = value
            End Set
        End Property
        
        Public Property 单价 As Decimal
            Get
                Try 
                    Return CType(Me(Me.tablexsys.单价Column),Decimal)
                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.tablexsys.单价Column) = value
            End Set
        End Property
        
        Public Property 总价 As Decimal
            Get
                Try 
                    Return CType(Me(Me.tablexsys.总价Column),Decimal)
                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.tablexsys.总价Column) = value
            End Set
        End Property
        
        Public Function Is书名Null() As Boolean
            Return Me.IsNull(Me.tablexsys.书名Column)
        End Function
        
        Public Sub Set书名Null()
            Me(Me.tablexsys.书名Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is姓名Null() As Boolean
            Return Me.IsNull(Me.tablexsys.姓名Column)
        End Function
        
        Public Sub Set姓名Null()
            Me(Me.tablexsys.姓名Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is数量Null() As Boolean
            Return Me.IsNull(Me.tablexsys.数量Column)
        End Function
        
        Public Sub Set数量Null()
            Me(Me.tablexsys.数量Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is单价Null() As Boolean
            Return Me.IsNull(Me.tablexsys.单价Column)
        End Function
        
        Public Sub Set单价Null()
            Me(Me.tablexsys.单价Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is总价Null() As Boolean
            Return Me.IsNull(Me.tablexsys.总价Column)
        End Function
        
        Public Sub Set总价Null()
            Me(Me.tablexsys.总价Column) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class xsysRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As xsysRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As xsysRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As xsysRow
            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