GetUniBlob(String) Method
Gets the value of the specified column as a
UniBlob object.
'Declaration
Public Overloads Function GetUniBlob( _
ByVal As String _
) As UniBlob
Parameters
- name
- The name of the column to get value of.
Return Value
The value of the specified column as a
UniBlob object.
This example shows how to download a BLOB field from a table using
GetUniBlob method.
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 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
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