C#读取Image数据类型:
(1)控制台应用程序下演示插入图片
public void InsertIMG()
{
//将需要存储的图片读取为数据流
FileStream fs = new FileStream(@"E:\c.jpg", FileMode.Open,FileAccess.Read);
Byte[] btye2 = new byte[fs.Length];
fs.Read(btye2 , 0, Convert.ToInt32(fs.Length));
fs.Close();
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "insert into T_Img(imgfile) values(@imgfile)";
SqlParameter par = new SqlParameter("@imgfile", SqlDbType.Image);
par.Value = bt;
cmd.Parameters.Add(par);
int t=(int)(cmd.ExecuteNonQuery());
if (t > 0)
{
Console.WriteLine("插入成功");
}
conn.Close();
}
}
(2)控制台应用程序下读出并生成图片到物理位置
public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];//读取第一个图片的位流
int ArraySize= MyData.GetUpperBound(0);//获得数据库中存储的位流数组的维度上限,用作读取流的上限
FileStream fs = new FileStream(@"c:\00.jpg", FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0, ArraySize);
fs.Close(); //-- 写入到c:\00.jpg。
conn.Close();
Console.WriteLine("读取成功");//查看硬盘上的文件
}
}
(3)Web下picshow.aspx页将图片读取出来并写入到浏览器上呈现
public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];
Response.ContentType = "image/gif";
Response.BinaryWrite(MyData);
conn.Close();
Response.Write("读取成功");
}
(4)在web中可以如上picshow.aspx页面读取并显示图片,而真正引用该图片时如下示例
(5)Winform下将图片写入到sql数据库image类型字段中的方法和以上方法基本一致,仅区别于可以利用多个对话框来帮助选取存储图片等,各个属性可以方便的利用上
(6)Winform下读取图片在picturebox控件中显示出来
方法一:利用MemoryStream 和System.Drawing.Image
public void Read()
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["ImgFile"];
MemoryStream mystream = new MemoryStream(MyData);
//用指定的数据流来创建一个image图片
System.Drawing.Image img = System.Drawing.Image.FromStream(mystream, true);
System.Windows.Forms.PictureBox picbox = new PictureBox();
picbox.Image = img;
picbox.Left = 30;
picbox.Top = 80;
picbox.Width = 800;
picbox.Height = 500;
this.Controls.Add(picbox);
mystream.Close();
conn.Close();
}
}
方法二:将流直接读取成图片并写入到物理位置,然后再行利用该图片呈现
void Read()
{
using (SqlConnection conn = new SqlConnection(sqlconnstr))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from T_img";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
byte[] Image_img = (byte[])sdr["ImgFile"];
if (Image_img.Length == 0)
{
return;
}
int filelength = Image_img.Length;
string imageName = "1.jpg";
string myUrl = Environment.CurrentDirectory + "\\" + imageName;
FileStream fs = new FileStream(myUrl, FileMode.OpenOrCreate,FileAccess.Write);
BinaryWriter BW = new BinaryWriter(fs);
BW.BaseStream.Write(Image_img, 0, filelength);
BW.Flush();
BW.Close();
System.Windows.Forms.PictureBox picbox = new PictureBox();
//为picbox添加图片方法一
//picbox.ImageLocation = myUrl;
//picbox.Width = 800;
//picbox.Height = 300;
//为picbox添加图片方法二
Bitmap bitmap = new Bitmap(myUrl);
picbox.Width = 100;//bitmap.Width;
picbox.Height = 80;//bitmap.Height;
picbox.Image = (Image)bitmap;
picbox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
picbox.Left = 20;
picbox.Top = 30;
this.Controls.Add(picbox);
conn.Close();
}
}
1、MS SQL Server系列,数据库的 表的 字段 类型 的确有Image,但是,MS SQL Server自带的管理工具(早先的“企业管理器”、后来的“SQL Server Management Studio”)都没有处理图象存取及展示的功能,所以,无法直接用MS SQL Server自带的组件来进行图象数据的存取。
2、不过,这对MS SQL Server的功能的影响并不大,因为在实际中,MS SQL Server自带的组件一般仅仅用于调试和开发,如何将图像数据存入MS SQL Server中,是程序设计人员要考虑的问题。
3、以下代码展示了如何向ACCESS数据库写入图片数据(向MS SQL写入的原理是一样的,只需要改动服务器的联接字串即可):
//-----------------------------------------------------------------
bool ACCWritePIC(AnsiString ACCDataName,AnsiString ACCTableName,AnsiString ACCFieldeName,\
int FS,TImage *ImageMe,int RorW)
{
AnsiString ConnSStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=.\\" + ACCDataName + ";Persist Security Info=False" ;
AnsiString AStrSql = "select * from " + ACCTableName;
TADOQuery* ADOQryUseDB=new TADOQuery(Application);
ADOQryUseDB->ConnectionString = ConnSStr;
ADOQryUseDB->SQL->Add(AStrSql);
ADOQryUseDB->Active = true;
try{
if(RorW == 0){
if(FS == 1){
if(!ADOQryUseDB->Eof){
ADOQryUseDB->Edit();
}else{
ADOQryUseDB->Append();
};
}else{
ADOQryUseDB->Append();//FS为0时追加
};
ADOQryUseDB->FieldByName(ACCFieldeName)->Clear();
TBlobField *Field = (TBlobField*)ADOQryUseDB->FieldByName(ACCFieldeName);
Field->Assign(ImageMe->Picture);
ADOQryUseDB->Post();
}else{
TStream *Stream1;
Graphics::TBitmap * pBitmap=new Graphics::TBitmap();
Stream1 = ADOQryUseDB->CreateBlobStream(ADOQryUseDB->FieldByName(ACCFieldeName),bmRead);
pBitmap->LoadFromStream(Stream1);
ImageMe->Picture->Assign(pBitmap);
}
ADOQryUseDB->Active = false;
delete ADOQryUseDB;
return true;
}catch (...) {return false;};
}
//-----------------------------------------------------------------
4、不同的编程环境下的具体代码不同,但原理基本一样。
把照片的路径添加进去就是了~~~~~
假设 table1 表里面有两个字段,stuID 和stuImage
插入数据就 insert into table1 values('20091041', '图片的绝对路径')
不能添加数据 就换这个 insert into table1 values('20091041', '图片的相对路径')