public function indexes($table_name)
{
$sql = sprintf("PRAGMA INDEX_LIST(%s);", $this->quote_table_name($table_name));
$result = $this->select_all($sql);
$indexes = array();
foreach ($result as $row) {
$indexes[] = array('name' => $row['name'], 'unique' => $row['unique'] ? true : false);
}
return $indexes;
}