ASP.NET2.0中将文件上传到数据库

最新推荐文章于 2025-08-10 13:24:43 发布
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最新推荐文章于 2025-08-10 13:24:43 发布
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CC 4.0 BY-SA版权
文章标签：数据库 xhtml c#
原文链接：http://www.cnblogs.com/wequst/articles/1319372.html
本文介绍如何使用C#在ASP.NET中实现文件上传功能，并将文件保存到Access和SQL Server数据库中，同时展示了从数据库读取并显示图片的方法。
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Code
作者：孟宪会 出自：【孟宪会之精彩世界】 发布日期：2007年4月28日 12点19分42秒 


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Access数据库代码


<%@ Page Language="C#" EnableViewState="true" %>

<%@ Import Namespace="System.Data.OleDb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

protected void Button1_Click( object sender, EventArgs e )
  {
    System.IO.Stream fileDataStream = FileUpload1.PostedFile.InputStream;

if (fileDataStream.Length < 1)
    {
      Msg.Text = "请选择文件。";
return;
    }

//得到文件大小
    int fileLength = FileUpload1.PostedFile.ContentLength;

//创建数组
    byte[] fileData = new byte[fileLength];
//把文件流填充到数组
    fileDataStream.Read(fileData, 0, fileLength);
//得到文件类型
    string fileType = FileUpload1.PostedFile.ContentType;

//构建数据库连接，SQL语句，创建参数
    string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Image2Access.mdb");
    OleDbConnection myConnection = new OleDbConnection(strCnn);
    OleDbCommand command = new OleDbCommand("INSERT INTO Person (PersonName,PersonEmail,PersonSex,PersonImageType,PersonImage)" +
"VALUES (@PersonName,@PersonEmail,@PersonSex,@PersonImageType,@PersonImage)", myConnection);

    command.Parameters.AddWithValue("@PersonName",TextBox1.Text);
    command.Parameters.AddWithValue("@PersonEmail", "mengxianhui@dotnet.aspx.cc");
    command.Parameters.AddWithValue("@paramPersonSex", "男");
    command.Parameters.AddWithValue("@PersonImageType", fileType);
    command.Parameters.AddWithValue("@PersonImage", fileData);


//打开连接，执行查询
    myConnection.Open();
    command.ExecuteNonQuery();
    myConnection.Close();
    Response.Redirect(Request.RawUrl);
  }


protected void Page_Load( object sender, EventArgs e )
  {

if (!Page.IsPostBack)
    {
      BindGrid();
    }
  }

private void BindGrid( )
  {
string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
+ Server.MapPath("Image2Access.mdb");
    OleDbConnection myConnection = new OleDbConnection(strCnn);
    OleDbCommand myCommand = new OleDbCommand("SELECT * FROM Person", myConnection);

try
    {
      myConnection.Open();
      GridView1.DataSource = myCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
      GridView1.DataBind();
    }
catch (OleDbException SQLexc)
    {
      Response.Write("提取数据时出现错误：" + SQLexc.ToString());
    }
  }
protected string FormatURL( object strArgument )
  {
return "ReadImage.aspx?id=" + strArgument.ToString();
  }  

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>上传文件到数据库</title>
</head>
<body>
<form id="MengXianhui" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%#Eval("PersonName") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<%#Eval("PersonEmail") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<%#Eval("PersonSex") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<img src="<%#FormatURL(Eval("PersonID")) %>" /></ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<br />
    姓名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
    照片：<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="上传" OnClick="Button1_Click"></asp:Button>
<p>
<asp:Label ID="Msg" runat="server" ForeColor="Red"></asp:Label></p>
</form>
</body>
</html>



SQL Server数据库代码


<%@ Page Language="C#" EnableViewState="true" %>

<%@ Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
string strCnn = "Persist Security Info=False;User ID=sa;Password=;Initial Catalog=Book;Server=(local);";
protected void Button1_Click( object sender, EventArgs e )
  {
    System.IO.Stream fileDataStream = FileUpload1.PostedFile.InputStream;

if (fileDataStream.Length < 1)
    {
      Msg.Text = "请选择文件。";
return;
    }

//得到文件大小
    int fileLength = FileUpload1.PostedFile.ContentLength;

//创建数组
    byte[] fileData = new byte[fileLength];
//把文件流填充到数组
    fileDataStream.Read(fileData, 0, fileLength);
//得到文件类型
    string fileType = FileUpload1.PostedFile.ContentType;

//构建数据库连接，SQL语句，创建参数

    SqlConnection myConnection = new SqlConnection(strCnn);
    SqlCommand command = new SqlCommand("INSERT INTO UserPhoto (UserName,ContentType,Photo)" +
"VALUES (@UserName,@ContentType,@Photo)", myConnection);

    command.Parameters.AddWithValue("@UserName", TextBox1.Text);
    command.Parameters.AddWithValue("@ContentType", fileType);
    command.Parameters.AddWithValue("@Photo", fileData);

//打开连接，执行查询
    myConnection.Open();
    command.ExecuteNonQuery();
    myConnection.Close();
    Response.Redirect(Request.RawUrl);
  }


protected void Page_Load( object sender, EventArgs e )
  {

if (!Page.IsPostBack)
    {
      BindGrid();
    }
  }

private void BindGrid( )
  {
    SqlConnection myConnection = new SqlConnection(strCnn);
    SqlCommand myCommand = new SqlCommand("SELECT * FROM UserPhoto Order By id DESC", myConnection);

try
    {
      myConnection.Open();
      GridView1.DataSource = myCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
      GridView1.DataBind();
    }
catch (Exception SQLexc)
    {
      Response.Write("提取数据时出现错误：" + SQLexc.ToString());
    }
  }
protected string FormatURL( object strArgument )
  {
return "ReadImage.aspx?id=" + strArgument.ToString();
  }  

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>上传文件到数据库</title>
</head>
<body>
<form id="MengXianhui" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%#Eval("UserName") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<img src="<%#FormatURL(Eval("id")) %>" /></ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<br />
    姓名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
    照片：<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="上传" OnClick="Button1_Click"></asp:Button>
<p>
<asp:Label ID="Msg" runat="server" ForeColor="Red"></asp:Label></p>
</form>
</body>
</html>



显示图片


<%@ Page Language="C#" %>

<%@ Import Namespace="System.Data.OleDb" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script runat="server">

protected void Page_Load( object sender, EventArgs e )
  {
////构建数据库连接，SQL语句，创建参数
    //ACCESS数据库使用本注释部分
//string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Image2Access.mdb");
//OleDbConnection myConnection = new OleDbConnection(strCnn);
//OleDbCommand command = new OleDbCommand("select * from Person Where PersonID =" + Request.QueryString["id"], myConnection);
//myConnection.Open();
//OleDbDataReader dr = command.ExecuteReader();
//if (dr.Read())
//{
//  Response.Clear();
//  Response.AddHeader("Content-Type", dr["PersonImageType"].ToString());
//  Response.BinaryWrite((byte[])dr["PersonImage"]);
//}
//dr.Close();
//myConnection.Dispose();

//构建数据库连接，SQL语句，创建参数
    string strCnn = "Persist Security Info=False;User ID=sa;Password=;Initial Catalog=Book;Server=(local);";
    SqlConnection myConnection = new SqlConnection(strCnn);
    SqlCommand command = new SqlCommand("select * from UserPhoto Where id =" + Request.QueryString["id"], myConnection);
    myConnection.Open();
    SqlDataReader dr = command.ExecuteReader();
if (dr.Read())
    {
      Response.Clear();
      Response.AddHeader("Content-Type", dr["ContentType"].ToString());
      Response.BinaryWrite((byte[])dr["Photo"]);
    }
    dr.Close();
    myConnection.Dispose();
  }
</script>



创建SQL数据表语句


CREATE TABLE [UserPhoto] (
    [id] [int] IDENTITY (1, 1) NOT NULL ,
    [UserName] [nvarchar] (255) COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [ContentType] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [Photo] [image] NOT NULL ,
    CONSTRAINT [PK_UserPhoto] PRIMARY KEY  CLUSTERED 
    (
        [id]
    )  ON [PRIMARY] 
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO