SringBoot 학습의 Jpa는 주로 사용자 정의 조회와 조건 결합과 페이지 나누기

/*
           
*/
@Query("select b from Book b where b.name like %?1%") //  hql（    ），Book    ，?1       ，    %            
public List findByName(String name);

/*
  sql
*/
@Query(value = "select * from book b where b.name=?1", nativeQuery = true)
List findByName(String name);

/*
             
*/
@Query(value="select * from t_book order by RAND() limit ?1",nativeQuery = true) //   false，      sql   
public List randomList(Integer n);

@Query(value = "select name,author,price from Book b where b.price>?1 and b.price2")
List findByPriceRange(long price1, long price2);

@Query(value = "select name,author,price from Book b where b.name like %:name%")
List findByNameMatch(@Param("name") String name);

@Query(value = "select * from book b where b.name=?1", nativeQuery = true)
List findByName(String name);

/*
  @Param      
*/
@Query("select name,author,price from Book b where b.name=:name and b.author=:author and b.price=:price")
List findByNamedParam(@Param("name")String name,@Param("author")String author,@Param("price")String price);

public ModelAndView list2(Book book){ //    
ModelAndView mav=new ModelAndView();
List bookList=bookDao.findAll(new Specification(){

    /*
        
     */
    @Override
    public Predicate toPredicate(Root root, CriteriaQuery> query, CriteriaBuilder cd) { //cb      ；query       ；root         
        Predicate predicate=cd.conjunction(); //conjunction：  
        //    null        
        if(book!=null){
            if(book.getName()!=null&&!"".equals(book.getName())){ //            
                predicate.getExpressions().add(cd.like(root.get("name"),"%"+book.getName()+"%")); //cb.like(root.get("name")：      ， like    ，     equal ；         
            }
            if(book.getAuthor()!=null&&!"".equals(book.getAuthor())){
                predicate.getExpressions().add(cd.like(root.get("author"),"%"+book.getAuthor()+"%"));
            }
        }
        return predicate; //          
    }

});

mav.addObject("bookList",bookList);
mav.setViewName("bookList");
return mav;

//    ，     
predicate.getExpressions().add(cd.greaterThanOrEqualTo(root.get("createDate"), document.getFirstDate()));
//    
predicate.getExpressions().add(cd.lessThanOrEqualTo(root.get("createDate"), document.getLastDate()));

//dao 
public interface DocumentRepository extends JpaRepository{

    Page findAll(Specification specification, Pageable pageable);
}

//service     
public interface DocumentService {

    public Page findAll(UsefulDocument document, int pageNum, int pageSize);

}

//service   
@Override
public Page findAll(UsefulDocument document, int pageNum, int pageSize) { //         

    List orders = new ArrayList(); //    
    //             
    if (document.getFirstDate() != null) { 
        orders.add(new Sort.Order(Sort.Direction.DESC, "createDate"));
    } else if (document.getLastDate() != null) {
        orders.add(new Sort.Order(Sort.Direction.DESC, "createDate"));
    } else { //   id 
        orders.add(new Sort.Order(Sort.Direction.ASC, "id"));
    }
    //      
    Sort sort = new Sort(orders); 
    //      ，    、           
    Pageable pageable=new PageRequest(pageNum,pageSize,sort);

    //  findAll        （             ）
    Page documentList = documentRepository.findAll(new Specification() { @Override …… }, pageable);

    //  ，     pageNum          
    return documentList;
}

Sort sort=new Sort(Sort.Direction.ASC,"age"); //            （          ）
//           String    

//    
Sort.Order order1=new Sort.Order(Sort.Direction.DESC,"age");
Sort.Order order2=new Sort.Order(Sort.Direction.ASC,"grade");
Sort.Order order3=new Sort.Order(Sort.Direction.DESC,"dnum");
//    
List list=new ArrayList<>();
list.add(order1);
list.add(order2);
list.add(order3);
//  Sort 
Sort sort=new Sort(list);

Iterable findAll(Sort sort);