admin_timeout.vb

图书馆管理系统,是数据库的课程设计,报告里面包含了需求分析数据字典概念结构设计逻辑结构设计数据库物理设计数据库实施

Imports System.Data
'引入数据库操作类命名空间
Imports System.Data.OleDb
'引入ADO.NET操作命名空间

Public Class win_timeout
    Inherits System.Windows.Forms.Form
    Dim sqlstr, sqlstr2 As String 'SQL语句标记
    Dim objDS, objDS2 As DataSet, i As Integer, CheckEvery As Boolean = True '数据在内存中的缓存

#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 GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents ListView1 As System.Windows.Forms.ListView
    Friend WithEvents ColumnHeader1 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader2 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader3 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader4 As System.Windows.Forms.ColumnHeader
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents GroupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents labelnow As System.Windows.Forms.Label
    Friend WithEvents clblockedstu As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents ColumnHeader5 As System.Windows.Forms.ColumnHeader
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(win_timeout))
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.labelnow = New System.Windows.Forms.Label
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.ListView1 = New System.Windows.Forms.ListView
        Me.ColumnHeader1 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader5 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader2 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader3 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader4 = New System.Windows.Forms.ColumnHeader
        Me.Button3 = New System.Windows.Forms.Button
        Me.GroupBox2 = New System.Windows.Forms.GroupBox
        Me.Button4 = New System.Windows.Forms.Button
        Me.clblockedstu = New System.Windows.Forms.CheckedListBox
        Me.GroupBox1.SuspendLayout()
        Me.GroupBox2.SuspendLayout()
        Me.SuspendLayout()
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.labelnow)
        Me.GroupBox1.Controls.Add(Me.Button2)
        Me.GroupBox1.Controls.Add(Me.Button1)
        Me.GroupBox1.Controls.Add(Me.ListView1)
        Me.GroupBox1.ForeColor = System.Drawing.SystemColors.ControlDark
        Me.GroupBox1.Location = New System.Drawing.Point(3, 0)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(528, 280)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "超时图书信息"
        '
        'labelnow
        '
        Me.labelnow.ForeColor = System.Drawing.SystemColors.ControlText
        Me.labelnow.Location = New System.Drawing.Point(104, 248)
        Me.labelnow.Name = "labelnow"
        Me.labelnow.Size = New System.Drawing.Size(208, 24)
        Me.labelnow.TabIndex = 3
        Me.labelnow.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
        '
        'Button2
        '
        Me.Button2.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Button2.Location = New System.Drawing.Point(344, 248)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(56, 24)
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "锁定"
        '
        'Button1
        '
        Me.Button1.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Button1.Location = New System.Drawing.Point(440, 248)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "关闭"
        '
        'ListView1
        '
        Me.ListView1.BackColor = System.Drawing.Color.DarkGray
        Me.ListView1.Columns.AddRange(New System.Windows.Forms.ColumnHeader() {Me.ColumnHeader1, Me.ColumnHeader5, Me.ColumnHeader2, Me.ColumnHeader3, Me.ColumnHeader4})
        Me.ListView1.FullRowSelect = True
        Me.ListView1.GridLines = True
        Me.ListView1.Location = New System.Drawing.Point(8, 17)
        Me.ListView1.Name = "ListView1"
        Me.ListView1.Size = New System.Drawing.Size(512, 223)
        Me.ListView1.TabIndex = 0
        Me.ListView1.View = System.Windows.Forms.View.Details
        '
        'ColumnHeader1
        '
        Me.ColumnHeader1.Text = "图书名"
        Me.ColumnHeader1.Width = 108
        '
        'ColumnHeader5
        '
        Me.ColumnHeader5.Text = "学生学号"
        Me.ColumnHeader5.Width = 97
        '
        'ColumnHeader2
        '
        Me.ColumnHeader2.Text = "借阅学生"
        Me.ColumnHeader2.Width = 90
        '
        'ColumnHeader3
        '
        Me.ColumnHeader3.Text = "该归还时间"
        Me.ColumnHeader3.Width = 150
        '
        'ColumnHeader4
        '
        Me.ColumnHeader4.Text = "超时天数"
        Me.ColumnHeader4.Width = 63
        '
        'Button3
        '
        Me.Button3.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Button3.Location = New System.Drawing.Point(68, 248)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(48, 24)
        Me.Button3.TabIndex = 3
        Me.Button3.Text = "解锁"
        '
        'GroupBox2
        '
        Me.GroupBox2.Controls.Add(Me.Button4)
        Me.GroupBox2.Controls.Add(Me.clblockedstu)
        Me.GroupBox2.Controls.Add(Me.Button3)
        Me.GroupBox2.Location = New System.Drawing.Point(533, 0)
        Me.GroupBox2.Name = "GroupBox2"
        Me.GroupBox2.Size = New System.Drawing.Size(128, 280)
        Me.GroupBox2.TabIndex = 1
        Me.GroupBox2.TabStop = False
        Me.GroupBox2.Text = "锁定的学生"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(12, 248)
        Me.Button4.Name = "Button4"
        Me.Button4.Size = New System.Drawing.Size(48, 24)
        Me.Button4.TabIndex = 5
        Me.Button4.Text = "全部"
        '
        'clblockedstu
        '
        Me.clblockedstu.BackColor = System.Drawing.Color.DarkGray
        Me.clblockedstu.CheckOnClick = True
        Me.clblockedstu.Location = New System.Drawing.Point(8, 17)
        Me.clblockedstu.Name = "clblockedstu"
        Me.clblockedstu.Size = New System.Drawing.Size(112, 212)
        Me.clblockedstu.TabIndex = 4
        Me.clblockedstu.ThreeDCheckBoxes = True
        '
        'win_timeout
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(664, 285)
        Me.Controls.Add(Me.GroupBox2)
        Me.Controls.Add(Me.GroupBox1)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.MaximizeBox = False
        Me.Name = "win_timeout"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "图书馆管理系统--超时管理"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox2.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub win_timeout_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        labelnow.Text = "现在是:" & Now()
        LoadData()
        LoadLockStu()
    End Sub

    Function LoadLockStu()
        sqlstr = "select * from studentinfo where islock=1" '读取锁定的学生
        objDS = GetData(sqlstr)
        clblockedstu.Items.Clear()
        For i = 0 To objDS.Tables(0).Rows.Count - 1
            clblockedstu.Items.Add(objDS.Tables(0).Rows(i)("name").ToString & "                           ," & objDS.Tables(0).Rows(i)("id"), False) '写入CheckedListBox,也将学生自动编号隐藏入box中
        Next
    End Function

    Function LoadData()
        sqlstr = "select * from landinfo where DateDiff('d',shouldreturntime,now())>0" '读取借阅超时的图书
        objDS = GetData(sqlstr)
        ListView1.Items.Clear()
        For i = 0 To objDS.Tables(0).Rows.Count - 1
            Dim li As New ListViewItem
            li.SubItems.Clear()
            li.SubItems(0).Text = showbookname(objDS.Tables(0).Rows(i)("bookid"))
            sqlstr2 = "select * from studentinfo where id=" & objDS.Tables(0).Rows(i)("studentid") & ""
            objDS2 = GetData(sqlstr2)
            If objDS2.Tables(0).Rows.Count > 0 Then
                li.SubItems.Add(objDS2.Tables(0).Rows(0)("learnid"))
                li.SubItems.Add(objDS2.Tables(0).Rows(0)("name").ToString())
            Else
                li.SubItems.Add("不详")
                li.SubItems.Add("不详")
            End If
            li.SubItems.Add(objDS.Tables(0).Rows(i)("shouldreturntime").ToString)
            li.SubItems.Add(DateDiff("d", objDS.Tables(0).Rows(i)("shouldreturntime"), Now()))
            ListView1.Items.Add(li) '插入到ListView1
        Next
    End Function

    Function showbookname(ByVal bookid) As String
        sqlstr2 = "select * from bookinfo where id=" & bookid & ""
        objDS2 = GetData(sqlstr2)
        If objDS2.Tables(0).Rows.Count > 0 Then
            Return objDS2.Tables(0).Rows(0)("name").ToString
        Else
            Return "不详"
        End If
    End Function

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.Close()
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If clblockedstu.CheckedItems.Count > 0 Then
            Dim dstu() As String
            For i = 0 To clblockedstu.CheckedItems.Count - 1
                dstu = Split(clblockedstu.CheckedItems(i), ",") '从列表中读出学生ID
                Try
                    sqlstr = "update studentinfo set islock=0 where id=" & dstu(1) & ""
                    objDS = GetData(sqlstr)
                Catch
                    MessageBox.Show("更新数据库错误", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)
                End Try
            Next
            LoadLockStu()
            MessageBox.Show("解锁成功", "操作成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
        Else
            MessageBox.Show("没有选择要解锁的学生", "操作错误", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If clblockedstu.Items.Count <> 0 Then '全选功能
            Dim k As Integer
            If CheckEvery Then
                For k = 0 To clblockedstu.Items.Count - 1
                    clblockedstu.SetItemCheckState(k, CheckState.Checked)
                Next
                CheckEvery = False
            Else
                For k = 0 To clblockedstu.Items.Count - 1
                    clblockedstu.SetItemCheckState(k, CheckState.Unchecked)
                Next
                CheckEvery = True
            End If
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If ListView1.SelectedItems.Count > 0 Then
            Try
                For i = 0 To ListView1.SelectedItems.Count - 1
                    sqlstr = "update studentinfo set islock=1 where learnid='" & ListView1.SelectedItems(i).SubItems(1).Text & "'"
                    UpdateData(sqlstr)
                Next
            Catch
                MessageBox.Show("更新数据库错误", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
            LoadData()
            LoadLockStu()
            MessageBox.Show("锁定成功", "操作成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
        Else
            MessageBox.Show("没有选择要锁定的学生", "操作错误", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub
End Class