将图像存储在数据库中
本文关键字:数据库 存储 图像 | 更新日期: 2023-09-27 18:35:18
>我在带有文件类型的输入中显示图像,然后我想将此图像保存到数据库.我知道如何将varbinary或图像存储到数据库,但我不知道如何访问输入文件?
SqlConnection con = new SqlConnection(stcon);
SqlCommand command = new SqlCommand();
string path = "";
System.Drawing.Image img = System.Drawing.Image.FromFile(path);
MemoryStream tmpStream = new MemoryStream();
img.Save(tmpStream, ImageFormat.Png); // change to other format
tmpStream.Seek(0, SeekOrigin.Begin);
byte[] imgBytes = new byte[100000];
tmpStream.Read(imgBytes, 0, 100000);
command.CommandText = "INSERT INTO image(image) VALUES (:image)";
IDataParameter par = command.CreateParameter();
par.ParameterName = "image";
par.DbType = DbType.Binary;
par.Value = imgBytes;
command.Parameters.Add(par);
command.ExecuteNonQuery();
您可以简单地使用System.IO.File.ReadAllBytes
方法来读取二进制文件:
byte[] imgBytes = System.IO.File.ReadAllBytes(@"c:'temp'capture.png");
所以在你的情况下,你可以这样使用它(替换路径):
string path = @"c:'temp'capture.png";
byte[] imgBytes = System.IO.File.ReadAllBytes(path);
command.CommandText = "INSERT INTO image(image) VALUES (:image)";
IDataParameter par = command.CreateParameter();
par.ParameterName = "image";
par.DbType = DbType.Binary;
par.Value = imgBytes;
command.Parameters.Add(par);
command.ExecuteNonQuery();
你有例子在 http://csharpdotnetfreak.blogspot.com/2009/07/display-images-gridview-from-database.html
顺便说一句,不要将图像保存在数据库中,而是将文件的路径保存在数据库中并将图像保存到磁盘。
有了您的问题,我认为您已将图像插入表中,现在想要检索插入的图像。 如果是这样,那么您可以尝试为
string sql = "";
string address = "";
SqlConnection con = new SqlConnection(ConnectionString);
sql = "SELECT Image from ImageTable where imageId=1";
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataAdapter adp = new SqlDataAdapter();
adp.SelectCommand = cmd;
adp.Fill(ds,"Data");
address = "C:''Users''CARDIT''Desktop''Imag1.jpeg";
byte[] bytes = (byte[])ds.Tables["Data"].Rows[i][0];
MemoryStream ms = new MemoryStream(bytes);
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);
Bitmap bmSave = new Bitmap(returnImage);
Bitmap bmTemp = new Bitmap(bmSave);
Graphics grSave = Graphics.FromImage(bmTemp);
grSave.DrawImage(returnImage, 0, 0, returnImage.Width, returnImage.Height);
bmTemp.Save(address); //If You want to save in Specific location
pictureBox1.Image = bmSave; //if you want to use Image in Picturebox Control;