ASP.NET2.0中将文件上传到数据库 -优快云博客

本文介绍如何使用C#在ASP.NET中实现文件上传功能，并将文件存储到Access和SQL Server数据库中，同时展示了从数据库读取并显示这些文件的方法。

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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">

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>

<title>上传文件到数据库</title>

</head>

<body>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">

<asp:TemplateField>

<%...#Eval("PersonName") %>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<%...#Eval("PersonEmail") %>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<%...#Eval("PersonSex") %>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

</asp:TemplateField>

</Columns>

</asp:GridView>

<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" %>

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