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<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script language="VB" runat="server">
'该过程根据传递过来的记录编号将该记录显示在下面的表单中
Sub Page_load(Sender As Object, E As EventArgs)
	If Not IsPostBack Then 
		'下面利用DataReader对象读取当前记录
		Dim conn As New SqlConnection("Server=localhost;Database=address;Uid=test;Pwd=123456")
		Dim strSql As String="Select * From users Where id=" & Request.QueryString("id")     '注意id
		Dim cmd As New SqlCommand(strSql, conn) 
		conn.Open()	
		Dim dr As SqlDataReader = cmd.ExecuteReader()				           
		'下面读取当前记录，并显示在文本框中
		dr.Read()													
		txtName.Text=dr.Item("name")
		txtTel.Text=dr.Item("tel")
		txtEmail.Text=dr.Item("email").ToString						'因为该字段可能为空，需要加ToString
		txtIntro.Text=dr.Item("intro").ToString

		lblId.Text=Request.QueryString("id")						'将传过来的Id保存到一个隐藏标签中 
		conn.Close() 
	End If
End Sub
Sub Enter_Click(Sender As Object, E As EventArgs)
	If CheckPWD(lblId.Text,txtUserPWD.Text)=True Then
		'下面建立Connection对象，并利用含有参数的SQL语句更新数据库
		Dim conn As New SqlConnection("Server=localhost;Database=address;Uid=test;Pwd=123456")
		Dim strSql="Update users Set name=@name,tel=@tel,email=@email,intro=@intro Where id=@id" 
		Dim cmd As New SqlCommand(strSql, conn)
		'下面给参数赋值
		cmd.Parameters.Add(New SqlParameter("@name",SqlDbType.NVarChar,50))
		cmd.Parameters("@name").Value=txtName.Text
		cmd.Parameters.Add(New SqlParameter("@tel",SqlDbType.NVarChar,50))
		cmd.Parameters("@tel").Value=txtTel.Text
		'下面给@email赋值，如果客户没有输入，则赋NULL值
		cmd.Parameters.Add(New SqlParameter("@email",SqlDbType.NVarChar,50))
		If txtEmail.Text<>"" Then
			cmd.Parameters("@email").Value=txtEmail.Text
		Else
			cmd.Parameters("@email").Value=DBNull.Value						'赋值NULL
		End If
		'下面给@intro赋值，如果客户没有输入，则赋NULL值
		cmd.Parameters.Add(New SqlParameter("@intro",SqlDbType.NText))
		If txtIntro.Text<>"" Then
			cmd.Parameters("@intro").Value=txtIntro.Text
		Else
			cmd.Parameters("@intro").Value=DBNull.Value						'赋值NULL
		End If		
		cmd.Parameters.Add(New SqlParameter("@id",SqlDbType.Int))
		cmd.Parameters("@id").Value=lblId.Text								'从隐藏标签中获取Id值
		'执行更新操作，完成后重定向回首页
		conn.Open()
		cmd.ExecuteNonQuery()
		conn.Close()

		'这里要将DataSet从缓存中删除，这样返回到首页后就会重新从数据库中读取更新后的数据
		Cache.Remove("ds")

		
		Response.Redirect("index.aspx")	
	Else
		message.Text="请输入正确的修改密码"
	End If
End Sub
'这个函数专门用来判断密码是否正确
Function CheckPWD(id As Integer,UserPWD As String)
	Dim conn As New SqlConnection("Server=localhost;Database=address;Uid=test;Pwd=123456")
	Dim strSql As String = "select UserPWD As total from users Where id=" & id
	Dim cmd As New SqlCommand(strSql, conn)							'建立Command对象
	conn.Open
	If  UserPWD=cmd.ExecuteScalar() Then
		CheckPWD=True
	Else
		CheckPWD=False
	End If
	conn.Close
End Function
</script>
<html>
<head>
	<link href="Style.css" type="text/css" rel="stylesheet">
</head>
<body>
	<h3 align="center">修改记录</h3>
	<center>
	<form runat="server">
		<table border="1" align="center" cellpadding="2" bgcolor="#FFFFFF" cellspacing="0" style="border-collapse: collapse" bordercolor="#D4D4D4" width="80%" >
		<tr>
			<td>姓名</td>
			<td>
				<asp:TextBox id="txtName" runat="server"  CssClass="inputbox"/>
				<asp:RequiredFieldValidator id="require1" ControlToValidate="txtName" ErrorMessage="必须输入用户名"  runat="server"/>
				<asp:RegularExpressionValidator id="Regular1" ControlToValidate="txtName" ValidationExpression="^[\u4e00-\u9fa5]{2,5}$" ErrorMessage="必须输入2位到5位汉字" runat="server" />
			</td>
		</tr>
			<tr>
				<td>电话：</td>
				<td>
					<asp:Textbox id="txtTel" runat="server"  CssClass="inputbox"/>（格式：010-12345678或手机号码)
					<asp:RequiredFieldValidator id="require2" ControlToValidate="txtTel" ErrorMessage="必须输入电话"  runat="server"/>
					<asp:RegularExpressionValidator id="Regular2" ControlToValidate="txtTel" ValidationExpression="^([0-9]{3,4}-[0-9]{7,8})|([0-9]{11})$" ErrorMessage="电话格式不正确" runat="server" />
				</td>
			</tr>
			<tr>
				<td>E-mail：</td>
				<td>
					<asp:Textbox id="txtEmail" columns="40" runat="server"  CssClass="inputbox"/>
					<asp:RegularExpressionValidator id="Regular3" ControlToValidate="txtEmail" ValidationExpression="^.{1,}@.{1,}\.[a-zA-Z]{2,3}$" ErrorMessage="E-mail格式不正确" runat="server" />
				</td>
			</tr>
			<tr>
				<td>简介：</td>
				<td><asp:Textbox id="txtIntro" Textmode="multiline" columns="40" rows="4" runat="server"  CssClass="inputbox"/></td>
			</tr>
			<tr>
				<td>修改密码：</td>
				<td><asp:Textbox id="txtUserPWD" Textmode="PassWord" columns="40" rows="4" runat="server"  CssClass="inputbox"/></td>
			</tr>
			<tr>
				<td><asp:Label id="lblId" visible="False" runat="server"/></td>
				<td><asp:button id="Enter" Text=" 保 存 " onClick="Enter_Click" runat="server"  CssClass="inputbutton"/></td>
			</tr>
		</table>
		<asp:Label id="message" runat="server"/>
	</form>
	<a href="index.aspx">返回首页</a>
	</center>
</body>
</html>
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