GetSQLiteBlob(Int32) Method

In This Topic

Gets the value of the specified column as a SQLiteBlob object.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Function GetSQLiteBlob( _
   ByVal i As Integer _
) As SQLiteBlob

public SQLiteBlob GetSQLiteBlob( 
   int i
)

Parameters

i: The zero-based column ordinal.

Return Value

The value of the specified column as a SQLiteBlob object.

Example

This example shows how to download a BLOB field from a table using GetSQLiteBlob method.

csharp

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();
  }
}

Visual Basic

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

Requirements

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

Reference

SQLiteDataReader Class
SQLiteDataReader Members
Overload List
SQLiteBlob Class

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