Retrieve image from Oracle DB

Question

So, i am using a web api to retrieve a image!! But, at the DB the image is a LongRaw. Im seeing at the google that i need to use the OracleDbType.Blob But, when i try to use th

Answer 1

I'm not sure what lretorno.Load(...) is doing to read the data, but this sudo code sample using a select statement might help you... I've always had to specifically get the blob and read it out to get the bytes in the past.

Example for retrieving a LONG RAW DataType

var imgCmd = new OracleCommand("SELECT photo FROM photos WHERE photo_id = 1", _con);
imgCmd.InitialLONGFetchSize = -1; // Retrieve the entire image during select instead of possible two round trips to DB
var reader = imgCmd.ExecuteReader();
if (reader.Read()) {
    // Fetch the LONG RAW
    OracleBinary imgBinary = reader.GetOracleBinary(0);
    // Get the bytes from the binary obj
    byte[] imgBytes = imgBinary.IsNull ? null : imgBinary.Value;
}
reader.Close();

Example for retrieving a BLOB DataType

var imgCmd = new OracleCommand("SELECT photo FROM photos WHERE photo_id = 1", _con);
var reader = imgCmd.ExecuteReader();
if (reader.Read()) {
    // Fetch the blob
    OracleBlob imgBlob = reader.GetOracleBlob(0);
    // Create byte array to read the blob into
    byte[] imgBytes = new byte[imgBlob.Length];
    // Read the blob into the byte array
    imgBlob.Read(imgBytes, 0, imgBlob.Length);
}
reader.Close();