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sqlserver数据库的image字段存入方法 ,读取

发布时间:2020-12-12 13:24:54 所属栏目:MsSql教程 来源:网络整理
导读: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.openFi


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();
                    //获取文件对话框中选定的文件名的字符串,包括文件路径 

                    FileStream fs = new FileStream(strimg,FileMode.Open,FileAccess.Read);
                    BinaryReader br = new BinaryReader(fs);
                    imgBytesIn = br.ReadBytes((int)fs.Length);
                    //fs.Length文件流的长度,用字节表示 
                    //从当前流中将count个字节读入字节数组中
                    //打开数据库
                    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 xytp=@Image",con);
                    cmd.Parameters.Add("@Image",SqlDbType.Image);
                    cmd.Parameters["@Image"].Value = imgBytesIn;
                    cmd.ExecuteNonQuery();

                    con.Close();
                    MessageBox.Show("图片上传成功"); 

                }
                catch
                {
                    MessageBox.Show("您选择的图片不能被读取或文件类型不对!","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
                    this.pictureBox1.Image = null;
                }
               
            }
        }      


读取:http://www.cnblogs.com/samcn/articles/1275072.html

准备工作,在库Im_Test中建立一张表Im_Info,此表中有两个字段,分别为Pr_Id (INT),Pr_Info (IMAGE),用来存储图形编号及图形信息。其语法如下: 
CREATE TEALE Im_Info ( 
 Pr_Id INT NULL , 
 Pr_Info IMAGE NULL 
 ) 

 第一步: 往表中插入一条记录,并初始化PR_INFO字段。其语法如下: 
INSERT INTO Im_Info VALUES (1 ,0xFFFFFFFF) 


 第二步往表中写入图形信息。其语法如下: 
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….. 为图形的十六进制数据,可以通过C 、Java等工具获得。

 

注意在写入图形信息前必须先将此数据库的 'select into/bulkcopy' 属性设置为 True ,其语法如下: 
use master 
 exec sp_dboption Im_Test,'select into/bulkcopy',True 

 

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",FileAccess.Read);
             Byte[] btye2 = new byte[fs.Length];
             fs.Read(btye2,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:0.jpg",FileMode.OpenOrCreate,FileAccess.Write);
                 fs.Write(MyData,ArraySize);
                 fs.Close();   //-- 写入到c:0.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

<img src="picshow.aspx" width="500" height="300" />
  (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,FileAccess.Write);
                 BinaryWriter BW = new BinaryWriter(fs);
                 BW.BaseStream.Write(Image_img,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();
                 
             }
         }

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