frmquerybook.vb

图书管理系统,用来管理图书的借还,以及借阅超过时间进行处罚,和管理员用户权限

Imports System.Data
Imports System.Data.SqlClient
Public Class frmQueryBook
    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 cbField As System.Windows.Forms.ComboBox
    Friend WithEvents cbCon As System.Windows.Forms.ComboBox
    Friend WithEvents tbValue As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents dgRst As System.Windows.Forms.DataGrid
    Friend WithEvents bnQuery As System.Windows.Forms.Button
    Friend WithEvents bnCancel As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(frmQueryBook))
        Me.cbField = New System.Windows.Forms.ComboBox
        Me.cbCon = New System.Windows.Forms.ComboBox
        Me.tbValue = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.dgRst = New System.Windows.Forms.DataGrid
        Me.bnQuery = New System.Windows.Forms.Button
        Me.bnCancel = New System.Windows.Forms.Button
        CType(Me.dgRst, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'cbField
        '
        Me.cbField.Items.AddRange(New Object() {"书名", "作者", "剩余数量", "图书类别"})
        Me.cbField.Location = New System.Drawing.Point(8, 48)
        Me.cbField.Name = "cbField"
        Me.cbField.Size = New System.Drawing.Size(121, 20)
        Me.cbField.TabIndex = 0
        '
        'cbCon
        '
        Me.cbCon.Items.AddRange(New Object() {"等于", "大于", "小于", "大于等于", "小于等于", "不等于", "模糊查"})
        Me.cbCon.Location = New System.Drawing.Point(136, 48)
        Me.cbCon.Name = "cbCon"
        Me.cbCon.Size = New System.Drawing.Size(80, 20)
        Me.cbCon.TabIndex = 1
        '
        'tbValue
        '
        Me.tbValue.Location = New System.Drawing.Point(224, 48)
        Me.tbValue.Name = "tbValue"
        Me.tbValue.Size = New System.Drawing.Size(248, 21)
        Me.tbValue.TabIndex = 2
        Me.tbValue.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 16)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "查询项目"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(144, 24)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(56, 16)
        Me.Label2.TabIndex = 4
        Me.Label2.Text = "查询条件"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(216, 24)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(56, 16)
        Me.Label3.TabIndex = 5
        Me.Label3.Text = "查询值"
        '
        'dgRst
        '
        Me.dgRst.DataMember = ""
        Me.dgRst.HeaderForeColor = System.Drawing.SystemColors.ControlText
        Me.dgRst.Location = New System.Drawing.Point(8, 88)
        Me.dgRst.Name = "dgRst"
        Me.dgRst.Size = New System.Drawing.Size(464, 200)
        Me.dgRst.TabIndex = 6
        '
        'bnQuery
        '
        Me.bnQuery.Location = New System.Drawing.Point(288, 16)
        Me.bnQuery.Name = "bnQuery"
        Me.bnQuery.TabIndex = 7
        Me.bnQuery.Text = "查询"
        '
        'bnCancel
        '
        Me.bnCancel.Location = New System.Drawing.Point(384, 16)
        Me.bnCancel.Name = "bnCancel"
        Me.bnCancel.TabIndex = 8
        Me.bnCancel.Text = "取消"
        '
        'frmQueryBook
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(480, 301)
        Me.Controls.Add(Me.bnCancel)
        Me.Controls.Add(Me.bnQuery)
        Me.Controls.Add(Me.dgRst)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.tbValue)
        Me.Controls.Add(Me.cbCon)
        Me.Controls.Add(Me.cbField)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.Name = "frmQueryBook"
        Me.Text = "frmQueryBook"
        CType(Me.dgRst, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label2.Click

    End Sub
    Private Sub Label3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label3.Click

    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnQuery.Click
        Dim strField As String = cbField.Text.Trim()
        Dim strCon As String = cbCon.Text.Trim()
        Dim strValue As String = tbValue.Text.Trim()

        Select Case strField
            Case "书名"
                strField = "bookname"
            Case "作者"
                strField = "author"
            Case "出版社"
                strField = "publish"
            Case "图书类别"
                strField = "bookclass"


        End Select

        Select Case strCon
            Case "等于"
                strCon = "="
            Case "大于"
                strCon = ">"
            Case "小于"
                strCon = "<"
            Case "大于等于"
                strCon = ">="
            Case "小于等于"
                strCon = "<="
            Case "不等于"
                strCon = "<>"
            Case "模糊查"
                strCon = "like"
        End Select

        Dim strSource As String = "workstation id=郭洪博;packet size=4096;integrated security=SSPI;initial catalog=books;persist security info=False"
        Dim strSelect As String

        If strCon = "like" Then
            strSelect = "select * from books where " + strField + " " + strCon + " '%" + strValue + "%'"
        Else
            If Not strCon = "ava" Then
                strSelect = "select * from books where " + strField + " " + strCon + " '" + strValue + "'"
            End If
        End If

        Dim conn As SqlConnection = New SqlConnection(strSource)
        Dim da As SqlDataAdapter = New SqlDataAdapter(strSelect, conn)
        Dim ds As DataSet = New DataSet
        da.Fill(ds, "books")

        dgRst.DataSource = ds
        dgRst.DataMember = "books"
    End Sub

    Private Sub bnCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnCancel.Click
        Me.Close()
    End Sub
End Class