ASP.NET2.0中将文件上传到Access数据库的代码、从数据库显示图片的代码=-优快云博客

本文介绍如何在ASP.NET应用程序中实现文件上传功能，并将文件存储到Access和SQL Server数据库。此外，还展示了如何从数据库中检索这些文件并在网页上显示。

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<%@ 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>

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