Spring 用于比较日期的引导 JPA 规范

Question

我需要找到 table 记录，这些记录将出现在用户传递的日期之间。我正在尝试为此编写一个规范，但它显示编译时错误如下：

The method between(Expression<? extends Y>, Expression<? extends Y>, Expression<? extends Y>) 
in the type CriteriaBuilder 
is not applicable for the arguments (Expression<Date>, Object, Object)

我已经尝试在各个论坛上进行搜索，但无法找到解决此问题的方法，可能是我做错了什么。请帮我解决这个问题。

规格Class

public class ScheduleClassSpecification implements Specification<ScheduleClassInformation> {

private SearchCriteria criteria;

@Override
public Predicate toPredicate(Root<ScheduleClassInformation> root,
        CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
    Expression<String> expression;
    Predicate predicate =null;

    if((criteria.getKey().equalsIgnoreCase("student"))){
         expression = root.join("course").join("student").get("student");
         predicate = criteriaBuilder.equal(expression, criteria.getValue());
    }else if(criteria.getKey().equalsIgnoreCase("startDate") || criteria.getKey().equalsIgnoreCase("endDate")){
        predicate = criteriaBuilder.between
                        (root.<Date>get(criteria.getKey()).as(java.util.Date.class), 
                                criteria.getValue(), 
                                criteria.getValue());  // Compile Time Error on this line

    }

    return predicate;
}

条件Class

public class SearchCriteria {
    private String key;
    private String operation;
    private Object value;}

从存储库中提取记录的服务

if(!Utility.isNull(Id)){
                idSpec = new ScheduleClassSpecification(new SearchCriteria("Student",":",Id));
            }

            Page<SCOutput>  listreturn = scRepo.findAll(Specification.where(idSpec), SCOutput.class,new PageRequest(0, 100));

Answer 1

因为编译器错误告诉您需要 Expression.

您可以通过将 criteria.getValue() 替换为 criteriaBuilder.literal(criteria.getValue())

来轻松做到这一点

Spring 用于比较日期的引导 JPA 规范

Spring Boot JPA Specification for Compare Dates

jpa

predicate

criteria-api

spring-data-jpa

spring-boot