frm_delbook.vb

一套完整的图书管理系统,初学者比较适用下载学习

Imports System.Data.OleDb
Public Class frm_DelBook
    Inherits System.Windows.Forms.Form
    Dim MyConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\Library.mdb")
    Dim MyCommand As OleDbCommand
    Dim MyReader As OleDbDataReader
    Dim dbset As New DataSet
    Friend WithEvents BtnSearch As System.Windows.Forms.Button
    Friend WithEvents DGResult As System.Windows.Forms.DataGridView
    Dim dataA As OleDbDataAdapter

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    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

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents TxtCondition As System.Windows.Forms.TextBox
    Friend WithEvents ChkBookName As System.Windows.Forms.CheckBox
    Friend WithEvents ChkISDN As System.Windows.Forms.CheckBox
    Friend WithEvents ChckAuthor As System.Windows.Forms.CheckBox
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.ComponentModel.ComponentResourceManager = New System.ComponentModel.ComponentResourceManager(GetType(frm_DelBook))
        Me.TxtCondition = New System.Windows.Forms.TextBox
        Me.ChkBookName = New System.Windows.Forms.CheckBox
        Me.ChkISDN = New System.Windows.Forms.CheckBox
        Me.ChckAuthor = New System.Windows.Forms.CheckBox
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.BtnSearch = New System.Windows.Forms.Button
        Me.DGResult = New System.Windows.Forms.DataGridView
        Me.GroupBox1.SuspendLayout()
        CType(Me.DGResult, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'TxtCondition
        '
        Me.TxtCondition.Location = New System.Drawing.Point(38, 57)
        Me.TxtCondition.Name = "TxtCondition"
        Me.TxtCondition.Size = New System.Drawing.Size(297, 21)
        Me.TxtCondition.TabIndex = 0
        '
        'ChkBookName
        '
        Me.ChkBookName.Location = New System.Drawing.Point(38, 23)
        Me.ChkBookName.Name = "ChkBookName"
        Me.ChkBookName.Size = New System.Drawing.Size(125, 26)
        Me.ChkBookName.TabIndex = 1
        Me.ChkBookName.Text = "通过书籍名称"
        '
        'ChkISDN
        '
        Me.ChkISDN.Location = New System.Drawing.Point(211, 23)
        Me.ChkISDN.Name = "ChkISDN"
        Me.ChkISDN.Size = New System.Drawing.Size(124, 26)
        Me.ChkISDN.TabIndex = 2
        Me.ChkISDN.Text = "通过ISDN号码"
        '
        'ChckAuthor
        '
        Me.ChckAuthor.Location = New System.Drawing.Point(383, 23)
        Me.ChckAuthor.Name = "ChckAuthor"
        Me.ChckAuthor.Size = New System.Drawing.Size(125, 26)
        Me.ChckAuthor.TabIndex = 3
        Me.ChckAuthor.Text = "通过作者"
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.TxtCondition)
        Me.GroupBox1.Controls.Add(Me.ChkISDN)
        Me.GroupBox1.Controls.Add(Me.ChckAuthor)
        Me.GroupBox1.Controls.Add(Me.ChkBookName)
        Me.GroupBox1.Controls.Add(Me.BtnSearch)
        Me.GroupBox1.Location = New System.Drawing.Point(10, 9)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(549, 94)
        Me.GroupBox1.TabIndex = 5
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "查找规则"
        '
        'BtnSearch
        '
        Me.BtnSearch.Location = New System.Drawing.Point(367, 55)
        Me.BtnSearch.Name = "BtnSearch"
        Me.BtnSearch.Size = New System.Drawing.Size(152, 23)
        Me.BtnSearch.TabIndex = 4
        Me.BtnSearch.Text = "查找"
        '
        'DGResult
        '
        Me.DGResult.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.DGResult.Location = New System.Drawing.Point(12, 124)
        Me.DGResult.Name = "DGResult"
        Me.DGResult.RowTemplate.Height = 23
        Me.DGResult.Size = New System.Drawing.Size(547, 150)
        Me.DGResult.TabIndex = 6
        '
        'frm_DelBook
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(578, 288)
        Me.Controls.Add(Me.DGResult)
        Me.Controls.Add(Me.GroupBox1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "frm_DelBook"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "删除书籍信息"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox1.PerformLayout()
        CType(Me.DGResult, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub frm_FindBook_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        DGResult.BorderStyle = BorderStyle.FixedSingle
        TxtCondition.Focus()
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.Close()
    End Sub
    Sub findByName()
        dbset.Clear()
        MyConnection.Open()

        MyCommand = New OleDbCommand("Select * from BookDetails WHERE BookName LIKE '" & TxtCondition.Text & "%'", MyConnection)
        dataA = New OleDbDataAdapter(MyCommand)
        dataA.Fill(dbset, "BookDetails")
        DGResult.ReadOnly = True
        DGResult.DataSource = dbset.Tables("BookDetails")
        MyReader = MyCommand.ExecuteReader()
        While MyReader.Read
        End While
        MyConnection.Close()
        MyReader.Close()
        MyCommand.Dispose()
    End Sub


    Sub findByAuthorName()
        dbset.Clear()
        MyConnection.Open()
        MyCommand = New OleDbCommand("Select * from BookDetails WHERE AuthorName LIKE '" & TxtCondition.Text & "%'", MyConnection)
        dataA = New OleDbDataAdapter(MyCommand)
        dataA.Fill(dbset, "BookDetails")
        DGResult.DataSource = dbset.Tables("BookDetails")
        MyReader = MyCommand.ExecuteReader()
        While MyReader.Read

        End While
        MyConnection.Close()
        MyReader.Close()
        MyCommand.Dispose()
    End Sub

    Sub findByISDN()
        dbset.Clear()
        MyConnection.Open()
        MyCommand = New OleDbCommand("Select * from BookDetails WHERE ISDN = '" & TxtCondition.Text & "'", MyConnection)
        dataA = New OleDbDataAdapter(MyCommand)
        dataA.Fill(dbset, "BookDetails")
        DGResult.ReadOnly = True
        DGResult.DataSource = dbset.Tables("BookDetails")
        MyReader = MyCommand.ExecuteReader()
        While MyReader.Read
        End While
        MyConnection.Close()
        MyReader.Close()
        MyCommand.Dispose()
    End Sub
    Sub clearFields()
        TxtCondition.Text = ""
        ChkBookName.Focus()
        dbset.Clear()
        DGResult.Update()
    End Sub

    Private Sub BtnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSearch.Click
        If ChkBookName.Checked = True Then
            findByName()
        Else
            If ChckAuthor.Checked = True Then
                findByAuthorName()
            Else
                If ChkISDN.Checked = True Then
                    findByISDN()
                Else
                End If
            End If
        End If
    End Sub
    Private Sub TxtCondition_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TxtCondition.KeyPress
        Dim strChar As Object
        strChar = e.KeyChar
        Select Case strChar
            Case ChrW(System.Windows.Forms.Keys.Enter)
                If checkTextbox(TxtCondition) = False Then
                    MsgBox("请输入搜索条件", MsgBoxStyle.Information, "图书管管理系统")
                Else
                    If checkTextbox(TxtCondition) = True Then
                        BtnSearch.Focus()
                    End If
                End If
            Case Else
                '什么也不做
        End Select
    End Sub
    Function checkTextbox(ByVal t As TextBox) As Boolean
        If t.Text = "" Then
            Return False
        Else
            If t.Text <> "" Then
                Return True
            End If
        End If
    End Function

    Private Sub ChkBookName_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChkBookName.CheckedChanged
        ChkISDN.Checked = False
        ChckAuthor.Checked = False
    End Sub

    Private Sub CheckBox2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChkISDN.CheckedChanged
        ChkBookName.Checked = False
        ChckAuthor.Checked = False
    End Sub

    Private Sub CheckBox3_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ChckAuthor.CheckedChanged
        ChkISDN.Checked = False
        ChkBookName.Checked = False
    End Sub

 
    Private Sub DGResult_CellContentDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DGResult.CellContentDoubleClick
        If DGResult.SelectedCells.Count <> -1 Then
            Dim DR As DialogResult
            DR = MsgBox("请确认是否删除 " & DGResult.Rows(e.RowIndex).Cells(1).Value & " 这条记录", MsgBoxStyle.YesNo, "信息框")
            If DR = Windows.Forms.DialogResult.Yes Then
                MyConnection.Open()
                MyCommand = New OleDbCommand("DELETE FROM BookDetails WHERE SN='" & DGResult.Rows(e.RowIndex).Cells(0).Value & "'", MyConnection)
                MyCommand.ExecuteNonQuery()
                MyConnection.Close()
                MyReader.Close()
                MyCommand.Dispose()
            Else
                Exit Sub
            End If
            BtnSearch_Click(sender, e)
        End If

    End Sub
End Class