Spring Data:JPA 存储库 findAll() 返回 *Map 而不是 List? [英] Spring Data: JPA repository findAll() to return *Map instead of List?

问题描述

我有一个看起来像这样的 Spring Data JPA 存储库接口:

I have a Spring Data JPA repository interface that looks something like this:

@Repository
public interface DBReportRepository extends JpaRepository<TransactionModel, Long> {

    List<TransactionModel> findAll();
    List<TransactionModel> findByClientId(Long id);
}

除了要返回 HashMap 类型的集合之外，是否有其他解决方法?我查看了 Spring Data 类，除了 List<> 返回值之外找不到任何其他内容.

Is there a workaround to make the same but for a Collection to be returned of type HashMap<K, V>? I've looked through the Spring Data classes and couldn't find anything other than List<> return values.

推荐答案

我不认为您会找到一个更简单的解决方案，即创建一个简单的单线来将您的结果转换为地图.使用 java 8 lambdas 既简单又快速:

I dont think you will find an easier solution as to create a simple one liner to convert your result to a map. It is simple and fast with java 8 lambdas:

Map<Long, Transaction> transactionMap = transactionList.stream()
         .collect(Collectors.toMap(Transaction::getId, Function.identity()));

这篇关于Spring Data:JPA 存储库 findAll() 返回 *Map 而不是 List?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！