add.vb

这是一个基于.NET平台

Imports System.Data
Imports System.Data.SqlClient

Public Class Form3
    Inherits System.Windows.Forms.Form
    '建立表单对象
    Public myrow As Data.DataRow
    '建立数据行对象
   
#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 Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.TextBox3 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(24, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(48, 24)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "用户名"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(24, 72)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 24)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "密码"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(16, 112)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(64, 24)
        Me.Label3.TabIndex = 2
        Me.Label3.Text = "密码确认"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(120, 32)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.TabIndex = 3
        Me.TextBox1.Text = ""
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(120, 72)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.TextBox2.TabIndex = 4
        Me.TextBox2.Text = ""
        '
        'TextBox3
        '
        Me.TextBox3.Location = New System.Drawing.Point(120, 112)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.TextBox3.TabIndex = 5
        Me.TextBox3.Text = ""
        '
        'Button1
        '
        Me.Button1.Font = New System.Drawing.Font("宋体", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Button1.Location = New System.Drawing.Point(16, 152)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 6
        Me.Button1.Text = "确定"
        '
        'Button2
        '
        Me.Button2.Font = New System.Drawing.Font("宋体", 9.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Button2.Location = New System.Drawing.Point(128, 152)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 7
        Me.Button2.Text = "取消"
        '
        'Form3
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.Info
        Me.ClientSize = New System.Drawing.Size(248, 205)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox3)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form3"
        Me.Text = "添加用户"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Then
            MsgBox("请输入用户名！")
            TextBox1.Focus()

        ElseIf TextBox2.Text = "" Then
            MsgBox("请输入密码！")
            TextBox2.Focus()

        ElseIf TextBox2.Text <> TextBox3.Text Then
            MsgBox("前后两次输入的密码不一致" + Chr(10) + "请重试", vbOKOnly + vbExclamation, "警告")
            TextBox2.Text = ""
            TextBox3.Text = ""
            Exit Sub
        Else

            Dim tablename As String
            tablename = "users"  '表的名称
            Dim SearchSQL As String
            SearchSQL = "SELECT * FROM users WHERE username = '" & TextBox1.Text & " '"
            Try
                Try
                    Dim ADOcmd As SqlDataAdapter
                    '建立DataSet对象 
                    Dim ds As DataSet = New DataSet '建立ADODataSetCommand对象

                    Dim mytable As DataTable
                    Dim rownumber As Integer '定义一个整型变量来存放当前行数

                    '建立表单对象
                    ADOcmd = New SqlDataAdapter(SearchSQL, "Server=(local);Database=mydb;User Id=sa;Password=;")

                    '建立ADODataSetCommand对象
                    ADOcmd.Fill(ds, tablename) '取得表单
                    mytable = ds.Tables.Item(0) '取得名为table的表
                    rownumber = 0 '设置为第一行
                    myrow = mytable.Rows.Item(rownumber)
                    '取得第一行数据
                Catch
                    'MsgBox("你输入的用户名有效！")
                End Try
                Dim s As String
                s = myrow.Item(0)
                s = s.Trim
                If s = TextBox1.Text Then  '比较输入用户名和和数据库的用户名
                    MsgBox("你输入的用户名已经存在，请重新输入！")
                    TextBox1.Text = ""
                    TextBox2.Text = ""
                    TextBox3.Text = ""
                    TextBox1.Focus()
                Else
                    str()
                End If
            Catch
               str()
            End Try
        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 str()
        Dim strCon As String
        strCon = "Server=(local); Database=mydb; User Id=sa; Password=;"
        Dim Conn As New SqlConnection(strCon)
        Dim strSql As String = "insert into users(username,pwd) values('" & TextBox1.Text & "','" & TextBox2.Text & "')"
        Dim Cmd As New SqlCommand(strSql, Conn)
        Dim dtAdapter As New SqlDataAdapter
        dtAdapter.SelectCommand = Cmd
        Dim dsResult As New DataSet
        Conn.Open()
        dtAdapter.Fill(dsResult)
        Conn.Close()
        MsgBox("数据增加成功！", MsgBoxStyle.Information + MsgBoxStyle.OKOnly, "系统提示")
        Me.Dispose()
    End Sub
End Class