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sqlserver資料庫的image欄位存入方法 ,讀取

存入方法

private void button1_Click(object sender, EventArgs e)
        {
            openFileImage.Filter = "*.jpg|*.JPG|*.gif|*.GIF|*.bmp|*.BMP";

            if (openFileImage.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    this.pictureBox1.Image = Image.FromStream(this.openFileImage.OpenFile());
                    string strimg = openFileImage.FileName.ToString();
                    //獲取檔案對話方塊中選定的檔名的字串,包括檔案路徑 

                    FileStream fs = new FileStream(strimg, FileMode.Open, FileAccess.Read);
                    BinaryReader br = new BinaryReader(fs);
                    imgBytesIn = br.ReadBytes((int)fs.Length);
                    //fs.Length檔案流的長度,用位元組表示 
                    //從當前流中將count個位元組讀入位元組陣列中
                    //開啟資料庫
                    SqlConnection con = new SqlConnection("server=192.168.1.164,1433;uid=sa;pwd=mas_lxw;database=Relocation_DT");
                    con.Open();
                    SqlCommand cmd = new SqlCommand("update gytd set 
[email protected]
", con); cmd.Parameters.Add("@Image", SqlDbType.Image); cmd.Parameters["@Image"].Value = imgBytesIn; cmd.ExecuteNonQuery(); con.Close(); MessageBox.Show("圖片上傳成功"); } catch { MessageBox.Show("您選擇的圖片不能被讀取或檔案型別不對!", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Warning); this.pictureBox1.Image = null; } } }

準備工作,在庫Im_Test中建立一張表Im_Info,此表中有兩個欄位,分別為Pr_Id (INT),Pr_Info (IMAGE),用來儲存圖形編號及圖形資訊。其語法如下: 
CREATE TEALE Im_Info ( 
 Pr_Id INT NULL , 
 Pr_Info IMAGE NULL 
 ) 

 第一步: 往表中插入一條記錄,並初始化PR_INFO欄位。其語法如下: 
INSERT INTO Im_Info VALUES (1 ,0xFFFFFFFF) 


 第二步往表中寫入圖形資訊。其語法如下: 
DECLARE @@ptrval varbinary(16) 
 SELECT @@ptrval = TEXTPTR(Pr_Info) 
 FROM Im_Info 
 WHERE Pr_Id = 1 
 WRITETEXT Im_Text.Im_Info 
 @@ptrval 0x624fd543fd….. 

 其中0x624fd543fd….. 為圖形的十六進位制資料,可以通過C 、Java等工具獲得。

 

注意在寫入圖形資訊前必須先將此資料庫的 'select into/bulkcopy' 屬性設定為 True ,其語法如下: 
use master 
 exec sp_dboption Im_Test ,'select into/bulkcopy' ,True 

 

C#讀取Image資料型別:

 

(1)控制檯應用程式下演示插入圖片

public void InsertIMG()
         {

            //將需要儲存的圖片讀取為資料流
             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)控制檯應用程式下讀出並生成圖片到物理位置

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"];//讀取第一個圖片的位流
                 int ArraySize= MyData.GetUpperBound(0);//獲得資料庫中儲存的位流陣列的維度上限,用作讀取流的上限

                FileStream fs = new FileStream(@"c:\00.jpg", FileMode.OpenOrCreate, FileAccess.Write);
                 fs.Write(MyData, 0, ArraySize);
                 fs.Close();   //-- 寫入到c:\00.jpg。
                 conn.Close();
                 Console.WriteLine("讀取成功");//檢視硬碟上的檔案
             }
         }

(3)Web下picshow.aspx頁將圖片讀取出來並寫入到瀏覽器上呈現

    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("讀取成功");
         }

(4)在web中可以如上picshow.aspx頁面讀取並顯示圖片,而真正引用該圖片時如下示例

<img src="picshow.aspx" width="500" height="300" />
  (5)Winform下將圖片寫入到sql資料庫image型別欄位中的方法和以上方法基本一致,僅區別於可以利用多個對話方塊來幫助選取儲存圖片等,各個屬性可以方便的利用上

(6)Winform下讀取圖片在picturebox控制元件中顯示出來

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);
                 //用指定的資料流來建立一個image圖片
                 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:將流直接讀取成圖片並寫入到物理位置,然後再行利用該圖片呈現

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();
                 
                 //為picbox新增圖片方法一
                 //picbox.ImageLocation = myUrl;
                 //picbox.Width = 800;
                 //picbox.Height = 300;

 

                //為picbox新增圖片方法二
                 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();
                 
             }
         }