'Declaration Public Class UniBlob Implements System.IDisposable
public class UniBlob : System.IDisposable
'Declaration Public Class UniBlob Implements System.IDisposable
public class UniBlob : System.IDisposable
See article Working with BLOB Data for detailed information.
public void DownloadBlob(UniConnection myConnection) { UniCommand myCommand = new UniCommand("SELECT * FROM Test.Pictures", myConnection); myConnection.Open(); UniDataReader myReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default); try { while (myReader.Read()) { UniBlob myBlob = myReader.GetUniBlob(myReader.GetOrdinal("Picture")); if(!myBlob.IsNull) { string FN = myReader.GetString(myReader.GetOrdinal("PicName")); FileStream fs = new FileStream("D:\\Tmp\\"+FN+".bmp", FileMode.Create); BinaryWriter w = new BinaryWriter(fs); w.Write(myBlob.Value); w.Close(); fs.Close(); Console.WriteLine(FN+" downloaded."); } } } finally { myReader.Close(); myConnection.Close(); } } public void UploadBlob(UniConnection myConnection) { FileStream fs = new FileStream("D:\\Tmp\\_Water.bmp", FileMode.Open, FileAccess.Read); BinaryReader r = new BinaryReader(fs); UniBlob myBlob = new UniBlob(r.ReadBytes((int)fs.Length)); UniCommand myCommand = new UniCommand("INSERT INTO Test.Pictures (ID, PicName, Picture) VALUES(1,'Water',:Pictures)", myConnection); myCommand.Parameters.Add("Pictures",myBlob); myConnection.Open(); try { Console.WriteLine(myCommand.ExecuteNonQuery()+" rows affected."); } finally { myConnection.Close(); r.Close(); } }
Public Sub DownloadBlob(ByVal myConnection As UniConnection) Dim myCommand As New UniCommand("SELECT * FROM Test.Pictures", myConnection) myConnection.Open() Dim myReader As UniDataReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default) Try While myReader.Read() Dim myBlob As UniBlob = myReader.GetUniBlob(myReader.GetOrdinal("Picture")) If Not myBlob.IsNull Then Dim FN As String = myReader.GetString(myReader.GetOrdinal("PicName")) Dim fs As FileStream = New FileStream("D:\Tmp\" + FN + ".bmp", FileMode.Create) Dim w As BinaryWriter = New BinaryWriter(fs) w.Write(myBlob.Value) w.Close() fs.Close() Console.WriteLine(String.Concat(FN, " downloaded.")) End If End While Finally myReader.Close() myConnection.Close() End Try End Sub Public Sub UploadBlob(ByVal myConnection As UniConnection) Dim fs As FileStream = New FileStream("D:\Tmp\_Water.bmp", FileMode.Open, FileAccess.Read) Dim r As BinaryReader = New BinaryReader(fs) Dim myBlob As UniBlob = New UniBlob(r.ReadBytes(Convert.ToInt32(fs.Length))) Dim myCommand As UniCommand = New UniCommand("INSERT INTO Test.Pictures (ID, PicName, Picture) VALUES(2,'Water',:Pictures)", myConnection) myCommand.Parameters.Add("Pictures", myBlob) myConnection.Open() Try Console.WriteLine(String.Concat(myCommand.ExecuteNonQuery(), " rows affected.")) Finally myConnection.Close() r.Close() End Try End Sub
System.Object
Devart.Data.Universal.UniBlob
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2