ASP.NET下向SQLServer2008导入文件实例操作方法

protected void fileUp_Click(object sender,EventArgs e)
{
if(FileUpload1.FileName==string.Empty)
{
Response.Write("<script>altert(‘请选择要上传的文件')</script>");
return;
}
string mailto:connstr=@%22Data Source=69F638102711447\SQL2008;Initial Catalog=VarFile;Integrated Security=Ture"; //数据库连接字符串
string the Selected=FileUpload1.FileName; //获取上传文件的后缀名
string extension=theSelected.Substring(theSelected.LastIndexOf(".")).ToLower();
if(CheckFileType(extension)) //如果有指定的文件类型
{

string contentType=GetContentType(extension);
string sqlstr="insert into FileInOut values(@FileType,@FileCount)"; //上传文件的SQL语句
string sqlstrclear="truncate table FileInOut"; //清空数据库SQL语句
SqlConnection con=new SqlConnection(connstr); //实例化数据库连接对象
SqlCommand cmd=new SqlCommand(sqlstr,con); //实例化上传文件SQL命令
SqlCommand cmdclear=new SqlCommand(sqlstrclear,con); //实例化清空数据库SQL命令
//定义问价类型参数
cmd.Parameters.Add(new SqlParameter("@FileType”,SlqDbType.NvarChar,30))；
cmd.Parameters["@FileType"].Value=contentType; //定义文件内容参数
cmd.Parameters.Add(new SqlParameter("@FileCount",SqlDbType.NVarChar,30)); //将文件转化为字节数组作为@FileCount的值
cmd.Parameters["@FileCount"].Value=FileUpload1.FileBytes;
con.Open();
cmdclear.ExecuteNonQuery(); //执行清空数据库命令
cmd.ExecuteNonQuery(); //执行上传文件命令
}
}

public static bool CheckFileType(string type)
{
StringDictionary sd=new StringDictionary(); //实例化集合StringDictionary类
sd.Add(".doc","application/msword");
sd.Add(".ppt","application/vnd.ms-powerpoint");
sd.Add(".xsl","application/vnd.ms-excel");
sd.Add(".rtf","application/msword");
sd.Add(".html","text/html");
sd.Add(".htm","text/html");
sd.Add(".txt","text/plain");
sd.Add(".pdf","application/pdf");
return sd.ContainsKey(type); //确定StringDictionary是否包含特定键
}

public static string GetContentType(string extension) //获取输出文件方式
{StringDictionary sd=new StringDictionary();
sd.Add(".doc","application/msword");
sd.Add(".ppt","application/vnd.ms-powerpoint");
sd.Add(".xsl","application/vnd.ms-excel");
sd.Add(".rtf","application/msword");
sd.Add(".html","text/html");
sd.Add(".htm","text/html");
sd.Add(".txt","text/plain");
sd.Add(".pdf","application/pdf");
return sd[extension]; //返回对应键的值
}