Method: Get prepared LIMIT clause for items query

Method: Returns the number of items to offset/skip for this current view.

Method: Get prepared OFFSET clause for items query

Method: Prepares the ORDER BY sql statement. It uses `$this->sort_by` to know which columns are sortable. This requests validates the orderby $_GET parameter is a valid column and sortable. It will also use order (ASC|DESC) using DESC by default.

Method: Return the sortable column specified for this request to order the results by, if any.

Method: Return the sortable column order specified for this request.

Method: Return the status filter for this request, if any.

Method: Return the search filter for this request, if any.

Method: Process and return the columns name. This is meant for using with SQL, this means it always includes the primary key.

Method: Check if the current request is doing a “full text” search. If that is the case prepares the SQL to search texts using LIKE.