JPA简单分页条件查询

落日映苍穹つ 2024-04-23 21:16 73阅读 0赞

### 分页条件查询 ###

Controller层

@PostMapping("getUserPage")
        public Page getUserPage(@RequestBody Map<String,Object> map){
        
            return userService.getUserPage(map);
        }

Service层

public Page getUserPage(Map<String, Object> map) {
        
            String orderBy = "id";
            Boolean isAsc = true;
            Boolean isDel=null;
            int pages = Integer.valueOf(map.get("pages").toString());
            map.remove("pages");
            int size = Integer.valueOf(map.get("size").toString());
            map.remove("size");
            if (map.get("orderBy") != null) {
        
                orderBy = (String) map.get("orderBy");
                map.remove("orderBy");
            }
            if (map.get("isAsc") != null) {
        
                isAsc = (Boolean) map.get("isAsc");
                map.remove("isAsc");
            }
            if (map.get("isDel") != null) {
        
                isDel = (Boolean) map.get("isDel");
                map.remove("isDel");
            }
            Boolean finalIsDel = isDel;
            Specification<User> spec = new Specification<User>() {
        
                @Override
                public Predicate toPredicate(Root<User> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder cb) {
        
                    Predicate res = null;
                    if (finalIsDel!= null) {
        
                        res = cb.equal(root.get("isDel"), finalIsDel);
                    }
                    for (String entryKey : map.keySet()) {
        
                        Path<Object> fuck = root.get(entryKey);
                        Predicate temp = cb.like(fuck.as(String.class), "%" + (String) map.get(entryKey) + "%");
                        if (res == null) {
        
                            res = temp;
                            continue;
                        }
                        res = cb.and(res, temp);
                    }
                    return res;
                }
            };
    
            Sort sort = Sort.by(Sort.Direction.ASC, orderBy);
            if (!isAsc) {
        
                sort = Sort.by(Sort.Direction.DESC, orderBy);
            }
            PageRequest page = PageRequest.of(pages - 1, size, sort);
            Page<User> one = userRepository.findAll(spec, page);
            System.out.println(one.getTotalElements());
            return one;
        }

建议接参写个dto，别直接map  
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