个人完成版---向数据库中以二进制方式存储图片---以及从数据库中读取二进制图片并转化为图片存储本地硬盘

第一 向数据库中存二进制的图片数据

//向数据库中以二进制的形式存储图片
try
{
//获取当前图片的路径
string FilePath = Server.MapPath("//hsPDFFiles/") + "zyh.jpg";
//将制定路径的图片添加到FileStream类中
FileStream fs = new FileStream(FilePath, FileMode.Open, FileAccess.Read);
//通过FileStream对象实例化BinaryReader对象
BinaryReader br = new BinaryReader(fs);
//通过BinaryReader类对象的ReadBytes()方法将FileStream类对象转化为二进制数组
byte[] imgBytesIn = br.ReadBytes((int)(fs.Length));

br.Close();//记得要关闭br
fs.Close();//还有fs

//第二步
//将图片添加到数据库中
string sql = string.Format(@"INSERT INTO dbo.cuProcedureImage( icuProcedureid ,sCaption ,Img ,iImgSize ,sRemark ,bDefalt ,dCreateDate ,sCreator)
VALUES(1474, '用于做上传图片的测试',@imgBytesIn, 0, '', 1, GETDATE(),'cttsoft')");
SqlParameter[] param = new SqlParameter[] { new SqlParameter("@imgBytesIn", imgBytesIn) };
int cMount = 0;
cMount = db.GetValueBySqlAsInteger(sql, param);

//DBHelper.GetExecuteQuery(sql, param);
}
catch (Exception e)
{
throw e;
}

第二 从数据库取图片数据

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//从数据库取出一张图片 并显示出来
if (!System.IO.Directory.Exists(Server.MapPath("//hsPDFFiles")))
{
Directory.CreateDirectory(Server.MapPath("//hsPDFFiles"));
}
string NewGuid = Guid.NewGuid().ToString();
string FileName = NewGuid + ".jpg";
//图片展示路径
string ImgShowPath = "../hsPDFFiles/" + FileName;

//实际存储路径
string PhysiclSavePath = string.Empty;

//实际存储路径--物理路径
PhysiclSavePath = "" + Server.MapPath("//hsPDFFiles/") + FileName;

PhysiclSavePath = PhysiclSavePath.Replace(@"", @"\");

string ssql = string.Format(@"SELECT TOP 1 Img FROM cuProcedureImage (NOLOCK) ORDER BY dCreateDate DESC");

DataTable dt = db.ExecuteDataTable(ssql, null);

if (dt.Rows.Count == 0)
{
db = null;
return View();
}
byte[] bytes = dt.Rows[0][0] as byte[];
try
{
FileStream fs = new FileStream(PhysiclSavePath, FileMode.Append, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(bytes, 0, bytes.Length);
bw.Close();
fs.Close();
db = null;
}
catch (Exception ex)
{
db = null;
throw ex;
}