/**
* Obtain DBMS specific SQL code portion needed to set an index
* declaration to be used in statements like CREATE TABLE.
*
* @return string
* @override
*/
public function getIndexFieldDeclarationListSql(array $fields)
{
$declFields = array();
foreach ($fields as $fieldName => $field) {
$fieldString = $fieldName;
if (is_array($field)) {
if (isset($field['length'])) {
$fieldString .= '(' . $field['length'] . ')';
}
if (isset($field['sorting'])) {
$sort = strtoupper($field['sorting']);
switch ($sort) {
case 'ASC':
case 'DESC':
$fieldString .= ' ' . $sort;
break;
default:
throw DoctrineException::unknownIndexSortingOption($sort);
}
}
} else {
$fieldString = $field;
}
$declFields[] = $fieldString;
}
return implode(', ', $declFields);
}