JPA同时支持精准搜索和模糊搜索

先上效果图

1、复杂查询需要继承 JpaSpecificationExecutor

public interface DrugBaseInfoRepository extends JpaRepository<DrugBaseInfoEntity,Long>, JpaSpecificationExecutor<DrugBaseInfoEntity> {
}

　　

 2、关键代码，查询实体类中增加自定义注解@NotCondition 用来标识哪些是不需要拼接成查询条件的字段。 然后实现类中通过反射查询实体类进行拼接。其中需要注意的是

@Data
public class DrugBaseInfoQuery {
    //是否模糊搜索
    @NotCondition
    private Boolean isFuzzySearch =false;
    private String genericName;
    private String rememberCode;
    private String manufacture;
    @NotCondition
    private Date beginDate;
    @NotCondition
    private Date endDate;
}

　　

 private Page<DrugBaseInfoEntity> getDataList(DrugBaseInfoQuery query, Pageable pageable) {
        Specification<DrugBaseInfoEntity> querySpecifi = new Specification<DrugBaseInfoEntity>() {
            public Predicate toPredicate(Root<DrugBaseInfoEntity> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {

                List<Predicate> predicates = new ArrayList<>();
                if (!StringUtils.isEmpty(query.getBeginDate())) {
                    //大于或等于传入时间
                    predicates.add(criteriaBuilder.greaterThanOrEqualTo(root.get("orderTime").as(Date.class), query.getBeginDate()));
                }
                if (!StringUtils.isEmpty(query.getEndDate())) {
                    //小于或等于传入时间
                    predicates.add(criteriaBuilder.lessThanOrEqualTo(root.get("orderTime").as(Date.class), query.getEndDate()));
                }
                if (query != null) {
                    Class<? extends DrugBaseInfoQuery> clazz = query.getClass();
                    Field[] fields = clazz.getDeclaredFields();
                    for (Field tmpField : fields) {
                        tmpField.setAccessible(true);
                        try {
                            NotCondition annotation = (NotCondition) tmpField.getDeclaredAnnotation(NotCondition.class);
                            if (tmpField.get(query) != null && annotation == null) {
                                String name = tmpField.getName();
                                if(query.getIsFuzzySearch()){
//                                    模糊匹配
                                    predicates.add(criteriaBuilder.like(root.get(name).as(String.class), "%"+ tmpField.get(query) + "%"));
                                }else{  //精准查找
                                    predicates.add(criteriaBuilder.equal(root.get(name), tmpField.get(query)));
                                }

                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
                // and到一起的话所有条件就是且关系，or就是或关系
                return criteriaBuilder.and(predicates.toArray(new Predicate[predicates.size()]));
            }
        };
        return drugBaseInfoRepository.findAll(querySpecifi, pageable);