航线信息查询.vb

这是个用VB编写的机票销售与查询管理系统

Public Class 航线信息查询
    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 ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents ComboBox2 As System.Windows.Forms.ComboBox
    Friend WithEvents RadioButton1 As System.Windows.Forms.RadioButton
    Friend WithEvents RadioButton2 As System.Windows.Forms.RadioButton
    Friend WithEvents Button3 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.ComboBox2 = New System.Windows.Forms.ComboBox
        Me.RadioButton1 = New System.Windows.Forms.RadioButton
        Me.RadioButton2 = New System.Windows.Forms.RadioButton
        Me.Button3 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'ComboBox1
        '
        Me.ComboBox1.Location = New System.Drawing.Point(216, 40)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(128, 20)
        Me.ComboBox1.TabIndex = 2
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(24, 168)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(120, 48)
        Me.Button1.TabIndex = 4
        Me.Button1.Text = "确定(&o)"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(168, 168)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(128, 48)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "取消(&x)"
        '
        'ComboBox2
        '
        Me.ComboBox2.Location = New System.Drawing.Point(216, 88)
        Me.ComboBox2.Name = "ComboBox2"
        Me.ComboBox2.Size = New System.Drawing.Size(128, 20)
        Me.ComboBox2.TabIndex = 6
        '
        'RadioButton1
        '
        Me.RadioButton1.Checked = True
        Me.RadioButton1.Location = New System.Drawing.Point(80, 40)
        Me.RadioButton1.Name = "RadioButton1"
        Me.RadioButton1.TabIndex = 7
        Me.RadioButton1.TabStop = True
        Me.RadioButton1.Text = "出发城市"
        '
        'RadioButton2
        '
        Me.RadioButton2.Location = New System.Drawing.Point(80, 88)
        Me.RadioButton2.Name = "RadioButton2"
        Me.RadioButton2.TabIndex = 8
        Me.RadioButton2.Text = "到达城市"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(328, 168)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(128, 48)
        Me.Button3.TabIndex = 9
        Me.Button3.Text = "重新查询"
        '
        '航线信息查询
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(488, 254)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.RadioButton2)
        Me.Controls.Add(Me.RadioButton1)
        Me.Controls.Add(Me.ComboBox2)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.ComboBox1)
        Me.Name = "航线信息查询"
        Me.Text = "航线信息查询"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Private Sub 航线信息查询_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        my_class.init()
        Dim ds As DataSet
        Dim con As String
        Dim count, i As Integer
        con = "select * from airlineinfo"
        ds = my_class.query(con)
        count = ds.Tables(0).Rows.Count
        For i = 0 To count - 1
            my_class.dr = ds.Tables(0).Rows(i)
            ComboBox1.Items.Add(Trim(CStr(my_class.dr(1))))
            ComboBox2.Items.Add(Trim(CStr(my_class.dr(2))))
        Next
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ds As DataSet
        Dim con As String
        Dim str As String
        Dim count, i As Integer
        If RadioButton1.Checked = True Then
            str = ComboBox1.Text
            con = "select * from airlineinfo where departcity='" + str + "'"
            ds = my_class.query(con)
            count = ds.Tables(0).Rows.Count
            '''''''''''''''''''''''''''''''''''''''''''''''''
            If (count > 0) Then
                Try
                    my_class.dr = ds.Tables(0).Rows(0)
                Catch ex As Exception
                    MsgBox("选择错误！")
                    Exit Try
                End Try
                ComboBox2.Text = ""
                ComboBox2.Items.Clear()
                ComboBox2.Text = Trim(CStr(my_class.dr("arrivalcity")))
                For i = 1 To count - 1
                    my_class.dr = ds.Tables(0).Rows(i)
                    ComboBox2.Items.Add(Trim(CStr(my_class.dr("arrivalcity"))))
                Next
            Else
                MsgBox("出发地中所选城市有误，请重新选择！")
                ComboBox1.Items.Clear()
                ComboBox2.Items.Clear()

            End If

            ''''''''''''''''''''''''''''''''''''''''''''''''''

        ElseIf RadioButton2.Checked = True Then
            str = ComboBox2.Text
            con = "select * from airlineinfo where arrivalcity='" + str + "'"
            ds = my_class.query(con)
            count = ds.Tables(0).Rows.Count
            If (count > 0) Then
                Try
                    my_class.dr = ds.Tables(0).Rows(0)
                Catch ex As Exception
                    MsgBox("选择错误！")
                    Exit Try
                End Try
                ComboBox1.Text = ""
                ComboBox1.Items.Clear()
                ComboBox1.Text = Trim(CStr(my_class.dr("departcity")))
                For i = 0 To count - 1
                    my_class.dr = ds.Tables(0).Rows(i)
                    ComboBox1.Items.Add(Trim(CStr(my_class.dr("departcity"))))
                Next
            Else
                MsgBox("目的地中所选城市有误，请重新选择！")
                ComboBox1.Items.Clear()
                ComboBox2.Items.Clear()
            End If
        ElseIf (RadioButton1.Checked = True And ComboBox1.Text = "") Or (RadioButton2.Checked = True And ComboBox2.Text = "") Then
            MsgBox("单选框选择有错误，请重新选择！")

        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.Close()
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        ComboBox1.Text = ""
        ComboBox2.Text = ""
        ComboBox1.Items.Clear()
        ComboBox2.Items.Clear()
        Dim ds As DataSet
        Dim con As String
        Dim count, i As Integer
        con = "select * from airlineinfo"
        ds = my_class.query(con)
        count = ds.Tables(0).Rows.Count
        For i = 0 To count - 1
            my_class.dr = ds.Tables(0).Rows(i)
            ComboBox1.Items.Add(CStr(my_class.dr(1)))
            ComboBox2.Items.Add(CStr(my_class.dr(2)))
        Next

    End Sub

    Private Sub 航线信息查询_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Activated
        Dim mdifrm As New MDIForm1
        mdifrm = Me.MdiParent
        mdifrm.StatusBar1.Panels(0).Text = Me.Text
    End Sub
End Class