The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 3: Accessing FILESTREAM Data from Client ApplicationsSqlTransaction trn = con.BeginTransaction("ItemTran");cmd.Transaction = trn;SqlDataReader reader;reader = cmd.ExecuteReader();// Retrieve the FilePath() of the image fileif (reader.Read()){txContext = (reader["txContext"] as byte[]);filePath = reader["filePath"].ToString();}reader.Close();Listing 3-18:Retrieving the FILESTREAM logical path name and transaction context.We can now go ahead and open the FILESTREAM data file. The sample code inListing 3-19 opens a FILESTREAM data file for read operation.//Open the FILESTREAM data fileSqlFileStream fs = new SqlFileStream(filePath, txContext, FileAccess.Read);Listing 3-19:Opening a FILESTREAM data file for read operation.Next, we open the target file into which we will write the data being read from theFILESTREAM data file (Listing 3-20).//Create the target data fileFileStream localFile = new FileStream("C:\\temp\\MicrosoftMouse2.jpg",FileMode.CreateNew);Listing 3-20:Creating a disk file to store the BLOB data.In Listing 3-21, we read from the FILESTREAM data file and write into the disk file we justcreated.110