reading tile-data from mbtiles generates "RangeError: Error #2006: The supplied index is out of bounds." - sqlite

Question

I am trying to read imagedata from a sqlite database ( it is a mbtiles map tiles file )
for that i tried to convert this php code
$sql = "SELECT * FROM tiles WHERE zoom_level = $zoom AND tile_column = $column AND tile_row = $row";
$q = $conn->prepare($sql);
$q->execute();
$q->bindColumn(1, $zoom_level);
$q->bindColumn(2, $tile_column);
$q->bindColumn(3, $tile_row);
$q->bindColumn(4, $tile_data, PDO::PARAM_LOB);
while($q->fetch())
{
header("Content-Type: image/png");
echo $tile_data;
}
to as3 using
_conn = new SQLConnection();
_conn.addEventListener(SQLEvent.OPEN, openHandler);
_conn.addEventListener(SQLErrorEvent.ERROR, errorHandler);
var folder:File = File.applicationDirectory;
var dbFile:File = folder.resolvePath("test.mbtiles");
_conn.openAsync(dbFile, SQLMode.READ);
function openHandler(event:SQLEvent):void
{
trace("db opened");
var selectStmt:SQLStatement = new SQLStatement();
selectStmt.sqlConnection = _conn;
selectStmt.text = "SELECT * FROM tiles WHERE zoom_level = 5 AND tile_column = 17 AND tile_row = 20";
selectStmt.execute();
}
but i am getting "RangeError: Error #2006: The supplied index is out of bounds."
Any ideas on how to solve this?
Thanks!

Answer 1

aha, nerver mind.
query should be
"SELECT CAST(tile_data AS ByteArray) as data " +
"FROM tiles WHERE " +
"zoom_level = 5 " +
"and tile_column = 17 " +
"and tile_row = 20";