frmlist.vb

visual Basic 数据库开发实例导航

Public Class frmList
    Inherits 图书管理系统.frmBase

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        '
        'frmList
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(608, 317)
        Me.Name = "frmList"

    End Sub

#End Region
    Public Overrides Sub Prepare()
        Me.Text = "图书逾期清单"
        Me.Label1.Text = "读者编号"
        Me.Label2.Text = "读者条码"
        Me.Label3.Text = "图书编号"
        Me.ToolBar1.Visible = False
        Me.dgdList.Dock = DockStyle.Fill
    End Sub
    Public Overrides Sub LoadData()
        Dim strFilter As String
        If txbOne.Text.Trim.Length = 0 Then
            If txbTwo.Text.Trim.Length = 0 Then
                If txbThree.Text.Trim.Length = 0 Then
                    strFilter = ""
                Else
                    strFilter = "and 图书编号 like '"
                    strFilter += txbThree.Text.Trim + "%'"
                End If
            Else
                strFilter = "where 读者条码 like '"
                strFilter += txbTwo.Text.Trim + "%'"
                If txbThree.Text.Trim.Length <> 0 Then
                    strFilter += " and 图书编号 like '"
                    strFilter += txbThree.Text.Trim + "%'"
                End If
            End If
        Else
            strFilter = "and 读者编号 like '"
            strFilter += txbOne.Text.Trim + "%'"
            If txbTwo.Text.Trim.Length <> 0 Then
                strFilter += " and 读者条码 like '"
                strFilter += txbTwo.Text.Trim + "%'"
                If txbThree.Text.Trim.Length <> 0 Then
                    strFilter += " and 图书编号 like '"
                    strFilter += txbThree.Text.Trim + "%'"
                End If
            Else
                If txbThree.Text.Trim.Length <> 0 Then
                    strFilter += " and 图书编号 like '"
                    strFilter += txbThree.Text.Trim + "%'"
                End If
            End If
        End If
        Dim db As DataBase = New DataBase
        Dim strSQL As String
        strSQL = "select 借阅编号,c.图书编号,书名 as 图书名称 ,借阅时间,应还时间,姓名,c.读者编号,续借次数,c.操作员,状态 from 图书信息 as a, 读者信息 as b,图书借阅 as c where a.编号 = c.图书编号 and b.编号 = c.读者编号 "
        strSQL += strFilter + " and 应还时间 < '" + Date.Now.ToString() + "' and 状态='未还'"
        Dim dv As DataView = db.RunSelectSQL(strSQL)
        dtData = dv.Table
    End Sub
    Public Overrides Sub SetDataGrid()
        LoadData()
        '定义一个DataGrid表样式
        Dim ts As New DataGridTableStyle
        Dim aColumnTextColumn As DataGridTextBoxColumn
        Dim numCols As Integer = dtData.Columns.Count
        Dim i As Integer
        For i = 0 To numCols - 1
            aColumnTextColumn = New DataGridTextBoxColumn
            aColumnTextColumn.MappingName = _
            dtData.Columns(i).ColumnName
            aColumnTextColumn.HeaderText = _
            dtData.Columns(i).ColumnName
            aColumnTextColumn.NullText = ""
            aColumnTextColumn.ReadOnly = True
            ts.GridColumnStyles.Add(aColumnTextColumn)
        Next
        ts.AlternatingBackColor = Color.LightGray
        ts.AllowSorting = False
        ts.MappingName = dtData.TableName
        dgdList.TableStyles.Clear()
        dgdList.TableStyles.Add(ts)
        Dim dv As DataView = dtData.DefaultView
        dv.AllowNew = False
        dv.AllowDelete = False
        'dv.AllowEdit = False
        '设置数据源
        dgdList.DataSource = dtData.DefaultView
        'bmData = Me.BindingContext(DataSet11, "图书罚款")
        lblCount.Text = "记录数:" + dtData.Rows.Count.ToString()
    End Sub

End Class