booktype.vb

图书借阅系统

Public Class frmBookType
    Inherits System.Windows.Forms.Form

#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。
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents grdBookType As System.Windows.Forms.DataGrid
    Friend WithEvents btnAdd As System.Windows.Forms.Button
    Friend WithEvents btnModify As System.Windows.Forms.Button
    Friend WithEvents txtBookType As System.Windows.Forms.TextBox
    Friend WithEvents btnDelete As System.Windows.Forms.Button
    Friend WithEvents btnClose As System.Windows.Forms.Button
    Friend WithEvents btnSave As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.grdBookType = New System.Windows.Forms.DataGrid
        Me.btnAdd = New System.Windows.Forms.Button
        Me.btnModify = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.txtBookType = New System.Windows.Forms.TextBox
        Me.btnDelete = New System.Windows.Forms.Button
        Me.btnClose = New System.Windows.Forms.Button
        Me.btnSave = New System.Windows.Forms.Button
        CType(Me.grdBookType, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'grdBookType
        '
        Me.grdBookType.DataMember = ""
        Me.grdBookType.HeaderForeColor = System.Drawing.SystemColors.ControlText
        Me.grdBookType.Location = New System.Drawing.Point(8, 8)
        Me.grdBookType.Name = "grdBookType"
        Me.grdBookType.ReadOnly = True
        Me.grdBookType.Size = New System.Drawing.Size(136, 232)
        Me.grdBookType.TabIndex = 0
        '
        'btnAdd
        '
        Me.btnAdd.Location = New System.Drawing.Point(152, 88)
        Me.btnAdd.Name = "btnAdd"
        Me.btnAdd.Size = New System.Drawing.Size(48, 23)
        Me.btnAdd.TabIndex = 1
        Me.btnAdd.Text = "添加"
        '
        'btnModify
        '
        Me.btnModify.Location = New System.Drawing.Point(216, 88)
        Me.btnModify.Name = "btnModify"
        Me.btnModify.Size = New System.Drawing.Size(48, 23)
        Me.btnModify.TabIndex = 2
        Me.btnModify.Text = "修改"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(160, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(80, 24)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "图书类别"
        '
        'txtBookType
        '
        Me.txtBookType.Location = New System.Drawing.Point(160, 40)
        Me.txtBookType.Name = "txtBookType"
        Me.txtBookType.Size = New System.Drawing.Size(120, 21)
        Me.txtBookType.TabIndex = 4
        Me.txtBookType.Text = ""
        '
        'btnDelete
        '
        Me.btnDelete.Location = New System.Drawing.Point(152, 144)
        Me.btnDelete.Name = "btnDelete"
        Me.btnDelete.Size = New System.Drawing.Size(48, 23)
        Me.btnDelete.TabIndex = 2
        Me.btnDelete.Text = "删除"
        '
        'btnClose
        '
        Me.btnClose.DialogResult = System.Windows.Forms.DialogResult.Cancel
        Me.btnClose.Location = New System.Drawing.Point(152, 200)
        Me.btnClose.Name = "btnClose"
        Me.btnClose.Size = New System.Drawing.Size(48, 23)
        Me.btnClose.TabIndex = 2
        Me.btnClose.Text = "关闭"
        '
        'btnSave
        '
        Me.btnSave.Location = New System.Drawing.Point(224, 144)
        Me.btnSave.Name = "btnSave"
        Me.btnSave.Size = New System.Drawing.Size(48, 23)
        Me.btnSave.TabIndex = 2
        Me.btnSave.Text = "保存"
        '
        'frmBookType
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.CancelButton = Me.btnClose
        Me.ClientSize = New System.Drawing.Size(288, 263)
        Me.Controls.Add(Me.txtBookType)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.btnModify)
        Me.Controls.Add(Me.btnAdd)
        Me.Controls.Add(Me.grdBookType)
        Me.Controls.Add(Me.btnDelete)
        Me.Controls.Add(Me.btnClose)
        Me.Controls.Add(Me.btnSave)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.MaximizeBox = False
        Me.Name = "frmBookType"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "设置图书类别"
        CType(Me.grdBookType, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private typeds As New DataSet

    Private Sub frmBookType_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            OleConn.SelectQuery("select * from 图书类别", typeds)
            If typeds.Tables.Count > 0 Then
                grdBookType.SetDataBinding(typeds, "Table")
                grdBookType.CurrentRowIndex = 0
                txtBookType.Text = grdBookType.Item(0, 0)
            End If
        Catch ex As Exception
            OleConn.DisplayError(ex)
        End Try
    End Sub

    Private Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click
        If txtBookType.Text = "" Then
            MsgBox("请输入图书类别")
            txtBookType.Focus()
        Else
            Try
                Dim dr As DataRow = typeds.Tables(0).NewRow()
                dr(0) = txtBookType.Text
                typeds.Tables(0).Rows.Add(dr)
                If grdBookType.CurrentRowIndex > 0 Then
                    txtBookType.Text = grdBookType.Item(grdBookType.CurrentRowIndex, 0)
                Else
                    grdBookType.CurrentRowIndex = 0
                    txtBookType.Text = grdBookType.Item(0, 0)
                End If
            Catch ex As Exception
                OleConn.DisplayError(ex)
            End Try
        End If
    End Sub

    Private Sub btnModify_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnModify.Click
        If txtBookType.Text = "" Then
            MsgBox("请输入图书类别")
            txtBookType.Focus()
        ElseIf grdBookType.CurrentRowIndex < 0 Then
            MsgBox("请先选择要修改的图书类别")
            grdBookType.Focus()
        Else
            Try
                Dim str As String = "类别='" & grdBookType.Item(grdBookType.CurrentRowIndex, 0) & "'"
                Dim dr As DataRow() = typeds.Tables(0).Select(str)
                dr(0).BeginEdit()
                dr(0).Item(0) = txtBookType.Text
                dr(0).EndEdit()
            Catch ex As Exception
                OleConn.DisplayError(ex)
            End Try
            MsgBox("修改成功")
        End If
    End Sub

    Private Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click
        If grdBookType.CurrentRowIndex < 0 Then
            MsgBox("请先选择要删除的图书类别")
            grdBookType.Focus()
        Else
            Try
                Dim str As String = "类别='" & grdBookType.Item(grdBookType.CurrentRowIndex, 0) & "'"
                Dim dr As DataRow() = typeds.Tables(0).Select(str)
                dr(0).Delete()
            Catch ex As Exception
                OleConn.DisplayError(ex)
            End Try
            MsgBox("删除成功")
        End If
    End Sub

    Private Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSave.Click
        Try
            OleConn.UpDate(typeds.Tables(0))
            typeds.AcceptChanges()
        Catch ex As Exception
            OleConn.DisplayError(ex)
        End Try
        MsgBox("保存成功")
    End Sub

    Private Sub grdBookType_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles grdBookType.MouseDown
        Dim hti As DataGrid.HitTestInfo
        hti = grdBookType.HitTest(e.X, e.Y)
        If hti.Type = DataGrid.HitTestType.Cell Or hti.Type = DataGrid.HitTestType.RowHeader Then
            txtBookType.Text = grdBookType.Item(hti.Row, 0)
        End If
    End Sub
End Class