相关疑难解决方法(0)

我JpaSpecificationExecutor用于创建自定义查询.如何为以下SQL创建规范？

select * from employee e, address a where e.id=23415 and e.name="Deepak" and a.city="Leeds";

Java类:

public static Specification<Employee> searchEmployee(final Map<String,String> myMap) {

    return new Specification<Employee>(){
        @Override
        public Predicate toPredicate(Root<Employee> root, CriteriaQuery<?> query, CriteriaBuilder cb) {

             //Need to query two tables Employee and Address  

           }
      }

在使用 JPA 接口时JpaSpecificationExecutor，我创建了以下代码，但它抛出错误：“至少提供了 2 个参数，但查询中仅存在 1 个参数”。

调用代码

@Override
public Result findSightsWithConditions(String cityId, Map<String, String> filter_map) {
  //scoreOrder priceOrder minScore maxScore minPrice maxPrice
  Specification<Sight> specification = new Specification<Sight>() {

    @Override
    public Predicate toPredicate(Root<Sight> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
      List<Predicate> predicates = Lists.newArrayList();
      //predicates.add(criteriaBuilder.equal(root.get("cityId"), cityId));
      if (null != filter_map.get("maxScore")) {
        double max = Integer.parseInt(filter_map.get("maxScore"));
        predicates.add(criteriaBuilder.lessThanOrEqualTo(root.get("score"), max));
      }
      if (null != filter_map.get("maxPrice")) {
        double max = Integer.parseInt(filter_map.get("maxPrice"));
        predicates.add(criteriaBuilder.lessThanOrEqualTo(root.get("price"), max));
      }
      if (null != filter_map.get("minScore")) {
        double min = Double.parseDouble(filter_map.get("minScore")); …