我目前正在开发一个Web应用程序，我必须从数据库中获取数据并在文本框中显示它。我有这些领域：
Name,Comp_Name,User_Name,Email_Id,Password,User_Image,Category,Status
并且在它上面我有一个文本框，用户可以输入id来查看数据。例如，如果我在文本框中写1。然后文本框将显示存储在数据库中的id=1记录的数据。
ASPX代码：
<head runat="server">
<title>Untitled Page</title>
<link href="User.css" type="text/css" rel="Stylesheet" />
<script type="text/javascript" src="imgpreview.js"></script>
<script type="text/javascript">
function showimagepreview(input) {
if (input.files && input.files[0]) {
var filerdr = new FileReader();
filerdr.onload = function(e) {
$('#imgprvw').attr('src', e.target.result);
}
filerdr.readAsDataURL(input.files[0]);
}
}
</script>
<style type="text/css">
#Header
{
height: 65px;
}
.style1
{
height: 37px;
}
.style2
{
width: 217px;
height: 37px;
}
.style3
{
height: 37px;
width: 155px;
}
.style4
{
height: 129px;
width: 155px;
}
.style5
{
width: 217px;
height: 129px;
}
.style6
{
height: 129px;
}
</style>
<script>
window.onload=function()
{
document.getElementById("button").style.display='none';
}
function showButton(){
document.getElementById("button").style.display='block';
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="Full">
<br />
<br />
<br />
<div id="Main">
<div id="MainHead">
<asp:Panel ID="Panel1" runat="server" Height="66px">
<br />
<asp:Label ID="ID" runat="server" Text="ID"></asp:Label>
& nbsp;
<input type="text" id="userText" value="Change the text" runat="server" /> <asp:Button
ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</asp:Panel>
</div>
<br />
<table style="height: 871px; width: 504px;">
<tr>
<td class="style3">
<asp:Label ID="Name" runat="server" Font-Bold="True" ForeColor="Black"
Text="Name :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
ControlToValidate="txtName"
Text="field required!"
runat="server" />
</td>
</tr><tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="CompName" runat="server" Font-Bold="True" ForeColor="Black"
Text="Comp Name :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtcomp" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="UserName" runat="server" Font-Bold="True" ForeColor="Black"
Text="User Name :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtuser" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2"
ControlToValidate="txtUser"
Text="field required!"
runat="server" />
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="Password" runat="server" Font-Bold="True" ForeColor="Black"
Text="Email-ID :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtemail" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3"
ControlToValidate="txtemail"
Text="field required!"
runat="server" />
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="Label5" runat="server" Font-Bold="True" ForeColor="Black"
Text="Password :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtpass" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style4">
<asp:Label ID="Label6" runat="server" Font-Bold="True" ForeColor="Maroon"
Text="User Image :"></asp:Label>
</td>
<td class="style5">
<input type="file" name="filUpload" id="filUpload" onchange="showimagepreview(this)" runat="server"/>
</td>
<td class="style6">
<asp:Panel ID="Panel2" runat="server" Height="122px">
<img id="imgprvw" alt="uploaded image preview"/>
</asp:Panel>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="Label7" runat="server" Font-Bold="True" ForeColor="Black"
Text="Category :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtcat" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="Label8" runat="server" Font-Bold="True" ForeColor="Black"
Text="Status :"></asp:Label>
</td>
<td class="style2">
<asp:DropDownList ID="txtddl" runat="server" Height="28px" Width="151px"
AutoPostBack="True">
<asp:ListItem>Store Manager</asp:ListItem>
<asp:ListItem>Pro Manager</asp:ListItem>
<asp:ListItem>Engg</asp:ListItem>
<asp:ListItem>Admin</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
<asp:Label ID="Label9" runat="server" Font-Bold="True" ForeColor="Black"
Text="Category No :"></asp:Label>
</td>
<td class="style2">
<asp:TextBox ID="txtcatno" runat="server" Height="21px" Width="151px"> </asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style2">
</td>
</tr>
<tr>
<td class="style1" colspan="2">
& nbsp; &n bsp;
<asp:Button id="Submit" runat="server" Text="Submit" onclick="Submit_Click" />
<input type="button" id="btnupd" value="New Button" runat="server" onclick="return btnupd_onclick()" />
</td>
</tr>
</table>
</div>
</div>
</form>
</body>
</html>
C＃代码：
using System;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using MySql.Data.MySqlClient;
using System.Windows.Forms;
public partial class _Default : System.Web.UI.Page
{
MySqlConnection con = new MySqlConnection("DataSource=localhost;database=mrp;userid=**;password=**;port=**");
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Submit_Click(object sender, EventArgs e)
{
try
{
//This is my connection string i have assigned the database file address path
string MyConnection2 = "datasource=localhost;port=**;username=**;password=**;database=mrp";
//This is my insert query in which i am taking input from the user through windows forms
string Query = "insert into user_tbl(Name,Comp_Name,User_Name,Email_Id,Password,User_Image,Category,Status) values('" + this.txtName.Text + "','" + this.txtcomp.Text + "','" + this.txtuser.Text + "','" + this.txtemail.Text + "','" + this.txtpass.Text + "','" + this.filUpload.Value + "','" + this.txtcat.Text + "','" + this.txtddl.Text + "');";
//This is MySqlConnection here i have created the object and pass my connection string.
MySqlConnection MyConn2 = new MySqlConnection(MyConnection2);
//This is command class which will handle the query and connection object.
MySqlCommand MyCommand2 = new MySqlCommand(Query, MyConn2);
MySqlDataReader MyReader2;
MyConn2.Open();
MyReader2 = MyCommand2.ExecuteReader(); // Here our query will be executed and data saved into the database.
MessageBox.Show("Save Data");
while (MyReader2.Read())
{
}
MyConn2.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
MySqlConnection con1 = new MySqlConnection("Data Source=localhost;database=mrp;userid=**;password=**;port=**");
var str = "select * from user_tbl,con1";
DataTable dt = new DataTable();
con1.Open();
MySqlDataReader myReader = null;
MySqlCommand myCommand = new MySqlCommand("Select * from user_tbl where Id=" + Id1, con1);
myReader = myCommand.ExecuteReader();
while (myReader.Read())
{
txtName.Text = (myReader["Name"].ToString());
txtemail.Text = (myReader["Email_Id"].ToString());
txtddl.Text = (myReader["Status"].ToString());
txtpass.Text = (myReader["Password"].ToString());
txtcomp.Text = (myReader["Comp_Name"].ToString());
txtuser.Text = (myReader["User_Name"].ToString());
filUpload.Value = (myReader["User_Image"].ToString());
//and whatever you have to retrieve
}
con1.Close();
}
}
答案 0 :(得分：0)
使用此代码段：
SqlConnection con1 = new SqlConnection("your connection string");
DataTable dt = new DataTable();
con1.Open();
SqlDataReader myReader = null;
SqlCommand myCommand = new SqlCommand("your query", con1);
myReader = myCommand.ExecuteReader();
while (myReader.Read())
{
txtName.Text = (myReader["name"].ToString());
txtEmail.Text = (myReader["email"].ToString());
//and whatever you have to retrieve
}
con1.Close();