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<?php
namespace ipl\Sql;
/**
* Interface for the ORDER BY part of a query
*/
interface OrderByInterface
{
/**
* Get whether a ORDER BY part is configured
*
* @return bool
*/
public function hasOrderBy();
/**
* Get the ORDER BY part of the query
*
* @return array|null
*/
public function getOrderBy();
/**
* Set the ORDER BY part of the query - either plain columns or expressions or scalar subqueries
*
* Note that this method does not override an already set ORDER BY part. Instead, each call to this function
* appends the specified ORDER BY part to an already existing one.
*
* This method does NOT quote the columns you specify for the ORDER BY.
* If you allow user input here, you must protected yourself against SQL injection using
* {@link Connection::quoteIdentifier()} for the field names passed to this method.
* If you are using special field names, e.g. reserved keywords for your DBMS, you are required to use
* {@link Connection::quoteIdentifier()} as well.
*
* @param string|int|array $orderBy The ORDER BY part. The items can be in any format of the following:
* ['column', 'column' => 'DESC', 'column' => SORT_DESC, ['column', 'DESC']]
* @param string|int $direction The default direction. Can be any of the following:
* 'ASC', 'DESC', SORT_ASC, SORT_DESC
*
* @return $this
*/
public function orderBy($orderBy, $direction = null);
/**
* Reset the ORDER BY part of the query
*
* @return $this
*/
public function resetOrderBy();
}
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