GetMySqlBlob(String) Method
Gets the value of the specified column as a
MySqlBlob object.
'Declaration
Public Overloads Function GetMySqlBlob( _
ByVal As String _
) As MySqlBlob
Parameters
- name
- The name of the column to get value of.
Return Value
The value of the specified column as a
MySqlBlob object.
This example shows how to download a BLOB field from a table using
GetMySqlBlob method.
public void DownloadBlob(MySqlConnection myConnection)
{
MySqlCommand myCommand = new MySqlCommand("SELECT * FROM Test.Pictures", myConnection);
myConnection.Open();
MySqlDataReader myReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default);
try
{
while (myReader.Read())
{
MySqlBlob myBlob = myReader.GetMySqlBlob(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 MySqlConnection)
Dim myCommand As New MySqlCommand("SELECT * FROM Test.Pictures", myConnection)
myConnection.Open()
Dim myReader As MySqlDataReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default)
Try
While myReader.Read()
Dim myBlob As MySqlBlob = myReader.GetMySqlBlob(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