changepwd.aspx.vb

asp做的网上书店销售系统数据库采用sqlserver

Imports System.Data.SqlClient
Public Class ChangePwd
    Inherits System.Web.UI.Page
    Protected WithEvents txtOldPwd As System.Web.UI.WebControls.TextBox
    Protected WithEvents UpdateBtn As System.Web.UI.WebControls.LinkButton
    Protected WithEvents txtNewPwd1 As System.Web.UI.WebControls.TextBox
    Protected WithEvents CompareValidator1 As System.Web.UI.WebControls.CompareValidator
    Protected WithEvents txtNewPwd2 As System.Web.UI.WebControls.TextBox

    Private connstr As String = System.Configuration.ConfigurationSettings.AppSettings("ConnectionString").ToString.Trim
    Private myconn As SqlConnection = New SqlConnection(connstr)


#Region " Web 窗体设计器生成的代码 "

    '该调用是 Web 窗体设计器所必需的。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
        '不要使用代码编辑器修改它。
        InitializeComponent()
    End Sub

#End Region

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        '在此处放置初始化页的用户代码
    End Sub
    '=============================================================
    ' 函 数 名：CheckPwd
    ' 功能描述：判断用户输入的旧密码是否正确
    ' 输入参数：无
    ' 返 回 值：Boolean值：true为用户密码正确 false用户输入密码错误
    ' 创建日期：2004-8-12
    ' 修改日期：2004-8-12
    ' 作    者：
    ' 附加说明：
    '==============================================================

    Private Function CheckPwd() As Boolean
        Dim ds As DataSet = New DataSet()
        Dim user As UserInfo = CType(Session("UserInfo"), UserInfo)

        Dim sqlstr As String = "select * from UserInfo where UserID=" + user.UserId + " and Password='" + txtOldPwd.Text.ToString + "'"
        Try
            Dim myAdapter As SqlDataAdapter = New SqlDataAdapter(sqlstr, myconn)
            myconn.Open()
            myAdapter.Fill(ds)
            If ds.Tables(0).Rows.Count = 1 Then
                myconn.Close()
                Return True
            Else
                Return False
            End If
        Catch
            Response.Write(sqlstr)
            Response.End()
        Finally
            myconn.Close()
        End Try
    End Function
    '用户单击更新之后处理函数
    Private Sub UpdateBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles UpdateBtn.Click
        If CheckPwd() <> True Then
            Response.Write("<script>javascript:alert('您输入的旧密码不正确！');</script>")
            txtOldPwd.Text = ""

        End If
        Dim user As UserInfo = CType(Session("UserInfo"), UserInfo)
        Dim sqlstr As String
        If txtNewPwd1.Text.ToString = "" Then
            sqlstr = "update UserInfo set Password=null where UserID=" + user.UserId.ToString
        Else
            sqlstr = "update UserInfo set Password='" + txtNewPwd1.Text.ToString + "' where UserID=" + user.UserId.ToString
        End If

        Try
            myconn.Open()
            Dim cmd As SqlCommand = New SqlCommand(sqlstr, myconn)
            cmd.ExecuteNonQuery()

        Catch
            Response.Write(sqlstr)
            Response.End()

        Finally
            myconn.Close()
        End Try

    End Sub
End Class