Spring Data JPA可以通过Specification进行动态查询

Specification<DebtsEntity> specification = new Specification<DebtsEntity>() {
public Predicate toPredicate(Root<DebtsEntity> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
Predicate prd  = null;
Predicate p0 = cb.notEqual(root.get("key1").as(String.class),"1");
Predicate p1 = cb.notEqual(root.get("key2").as(String.class),"2");
Predicate p2 = cb.equal(root.get("key3").as(String.class), "3");
Predicate p3 = cb.like(root.get("key4").as(String.class),"%"+name+"%");
prd=cb.and(p0,p1,p2,p3);
query.where(prd);

// 添加排序的功能
query.orderBy(cb.desc(root.get("key5")));
return query.getRestriction();
}
};
Page<DebtsEntity> contactsPage = deptsDao.findAll(specification, pageable);