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ASP.NET2.0中将文件上传到数据

点击次数:1145  更新日期:2010-12-27
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此问题经常被人问，本文列出将文字和图片上传到数据库的方法。包括Access数据库和SQL Server数据库。


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Access数据库代码


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


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<%@ 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”>


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<script runat=”server”>


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


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


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


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//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;


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//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);


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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);


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


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protected void Page_Load( object sender, EventArgs e )
{


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


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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);


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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();
}


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</script>


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<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>


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SQL Server数据库代码


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


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<%@ 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”>


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<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;


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


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


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//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;


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//构建数据库连接，SQL语句，创建参数


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


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


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


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protected void Page_Load( object sender, EventArgs e )
{


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


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


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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();
}


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</script>


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<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>


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显示图片


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<%@ Page Language=”C#” %>


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


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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();


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//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>


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创建SQL数据表语句


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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


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来源:孟宪会之精彩世界

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