How do I reuse a parameter witha Spring-Data-JPA Repository?

问题

In looking at the Query Creation for the Spring Data JPA Repositories, I'm wondering how I would reuse a parameter. For example, how would I name the method if I wanted to do something like:

@Query("select c from #{#entityName} c where c.lower <= ?1 and c.upper >= ?1")
E findByConversionFor(Double amount);

Can that query be converted to a SpEL method name (to be used by the query builder)?

It seems like a kludge to require the same value to be passed twice:

E findByLowerLessThanOrEqualAndUpperGreaterThanOrEqual(Double a, Double b); // where a==b

回答1:

Just mark your parameter with @Param("amount") and then will be able to use it by name:

@Query("select c from #{#entityName} c where c.lower <= :amount and c.upper >= :amount")

来源：https://stackoverflow.com/questions/44661123/how-do-i-reuse-a-parameter-witha-spring-data-jpa-repository