GetSQLiteBlob(Int32) Method
Gets the value of the specified column as a
SQLiteBlob object.
'Declaration
Public Overloads Function GetSQLiteBlob( _
ByVal As Integer _
) As SQLiteBlob
Parameters
- i
- The zero-based column ordinal.
Return Value
The value of the specified column as a
SQLiteBlob object.
This example shows how to download a BLOB field from a table using
GetSQLiteBlob method.
public void DownloadBlob(SQLiteConnection sqConnection)
{
SQLiteCommand sqCommand = new SQLiteCommand("SELECT * FROM Pictures", sqConnection);
sqConnection.Open();
SQLiteDataReader sqReader = sqCommand.ExecuteReader(System.Data.CommandBehavior.Default);
try
{
while (sqReader.Read())
{
SQLiteBlob myBlob = sqReader.GetSQLiteBlob(sqReader.GetOrdinal("Picture"));
if(!myBlob.IsNull)
{
string FN = sqReader.GetString(sqReader.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
{
sqReader.Close();
sqConnection.Close();
}
}
Public Sub DownloadBlob(ByVal sqConnection As SQLiteConnection)
Dim sqCommand As New SQLiteCommand("SELECT * FROM Pictures", sqConnection)
sqConnection.Open()
Dim sqReader As SQLiteDataReader = sqCommand.ExecuteReader(System.Data.CommandBehavior.Default)
Try
While sqReader.Read()
Dim myBlob As SQLiteBlob = sqReader.GetSQLiteBlob(sqReader.GetOrdinal("Picture"))
If Not myBlob.IsNull Then
Dim FN As String = sqReader.GetString(sqReader.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
sqReader.Close()
sqConnection.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