frm_user.vb

图书管理系统 VB加SQL 数据库在文件里的DATA里 进到SQL里附加进去就可以使用了

Public Class Frm_User
    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 Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button5 As System.Windows.Forms.Button
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.Button4 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.Button5 = New System.Windows.Forms.Button
        Me.Label2 = New System.Windows.Forms.Label
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.DataGrid1 = New System.Windows.Forms.DataGrid
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.ComboBox1 = New System.Windows.Forms.ComboBox
        Me.GroupBox1.SuspendLayout()
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(19, 22)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "添加用户"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(107, 22)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 0
        Me.Button2.Text = "删除用户"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(195, 22)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 0
        Me.Button3.Text = "刷新"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(432, 22)
        Me.Button4.Name = "Button4"
        Me.Button4.TabIndex = 0
        Me.Button4.Text = "退出"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(18, 70)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(72, 23)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "查询条件："
        '
        'Button5
        '
        Me.Button5.Location = New System.Drawing.Point(432, 64)
        Me.Button5.Name = "Button5"
        Me.Button5.TabIndex = 0
        Me.Button5.Text = "查询"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(218, 70)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(72, 23)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "查询数值："
        '
        'GroupBox1
        '
        Me.GroupBox1.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.GroupBox1.Controls.Add(Me.ComboBox1)
        Me.GroupBox1.Controls.Add(Me.TextBox1)
        Me.GroupBox1.Controls.Add(Me.Button2)
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Controls.Add(Me.Button4)
        Me.GroupBox1.Controls.Add(Me.Label1)
        Me.GroupBox1.Controls.Add(Me.Button1)
        Me.GroupBox1.Controls.Add(Me.Button3)
        Me.GroupBox1.Controls.Add(Me.Button5)
        Me.GroupBox1.Location = New System.Drawing.Point(0, 0)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(520, 96)
        Me.GroupBox1.TabIndex = 3
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "基本操作"
        '
        'DataGrid1
        '
        Me.DataGrid1.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.DataGrid1.DataMember = ""
        Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText
        Me.DataGrid1.Location = New System.Drawing.Point(4, 96)
        Me.DataGrid1.Name = "DataGrid1"
        Me.DataGrid1.ReadOnly = True
        Me.DataGrid1.Size = New System.Drawing.Size(512, 248)
        Me.DataGrid1.TabIndex = 4
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(287, 67)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = ""
        '
        'ComboBox1
        '
        Me.ComboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList
        Me.ComboBox1.Items.AddRange(New Object() {"用户名", "姓名"})
        Me.ComboBox1.Location = New System.Drawing.Point(95, 67)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(105, 20)
        Me.ComboBox1.TabIndex = 3
        '
        'Frm_User
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(520, 350)
        Me.Controls.Add(Me.DataGrid1)
        Me.Controls.Add(Me.GroupBox1)
        Me.Name = "Frm_User"
        Me.Text = "用户管理"
        Me.GroupBox1.ResumeLayout(False)
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region


    Private db As New DataBase

    '加载
    Private Sub Frm_User_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim sqlstr As String
        sqlstr = "select * from 用户表"
        Dim ds As New DataSet
        ds = db.RunSelectDataSet(sqlstr)
        '定义一个DataGrid表的样式
        Dim MyTable As New DataGridTableStyle
        '设置DataGrid1中奇数行的背景颜色
        MyTable.AlternatingBackColor = Color.LightGray
        '不允许单击列标头对网格进行重新排序
        MyTable.AllowSorting = False
        '将表样式MyTable添加到DataGrid1中
        DataGrid1.TableStyles.Add(MyTable)
        MyTable.MappingName = ds.Tables(0).TableName
        DataGrid1.DataSource = ds.Tables(0)
    End Sub
    '添加用户
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim frm As New Frm_AddUser
        frm.ShowDialog()
    End Sub
    '删除用户
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim frm As New Frm_DelUser
        frm.ShowDialog()
    End Sub
    '刷新
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim sqlstr As String
        sqlstr = "select * from 用户表"
        db.Open()
        DataGrid1.DataSource = db.RunSelectSQL(sqlstr)
        db.Close()
    End Sub
    '退出
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Me.Close()
    End Sub
    '查询
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Dim str1, str2 As String
        str1 = Trim(ComboBox1.Text)
        str2 = Trim(TextBox1.Text)
        If str1 = "" Then
            MessageBox.Show("请选择查询条件！", "提示", MessageBoxButtons.OK)
            Exit Sub
        End If
        If str2 = "" Then
            MessageBox.Show("请输入要查询的相关数值！", "提示", MessageBoxButtons.OK)
            Exit Sub
        End If
        Try
            Dim sqlstr As String
            Dim dv As New DataView
            sqlstr = "select * from 用户表 where " & ComboBox1.Text & " like '%" & TextBox1.Text & "%'"
            db.Open()
            dv = db.RunSelectSQL(sqlstr)
            If dv.Count() <> 0 Then
                DataGrid1.DataSource = dv
            Else
                MessageBox.Show("没有您要查找的记录？", "提示", MessageBoxButtons.OK)
            End If
            db.Close()
        Catch ex As Exception
            MessageBox.Show("没有您要查找的记录？", "提示", MessageBoxButtons.OK)
        End Try
    End Sub
End Class