initializes our documents object and underlying database connection . concode_field_sep Connection con concode_elem_sep PreparedStatement findByFileNameSQL concode_elem_sep PreparedStatement findByIDSQL concode_elem_sep PreparedStatement deleteItemSQL concode_elem_sep PreparedStatement newItemSQL concode_elem_sep PreparedStatement listSQL concode_elem_sep PreparedStatement updateItemSQL concode_field_sep Document newItem concode_elem_sep void deleteItem concode_elem_sep void deleteItem concode_elem_sep Document findByID concode_elem_sep Document fromResultSet concode_elem_sep Document findByFileName concode_elem_sep boolean exists concode_elem_sep boolean exists concode_elem_sep void updateItem concode_elem_sep void createDb concode_elem_sep List<Document> list