java - 使用SpringData和QueryDSL-JPA查询 map 值

我得到以下数据结构

@Entity
public class Publication {
   private Map<Integer, Author> authors;
   // more stuff
}

@Entity
public class Author {
   private String name;
   // more stuff
}

我正在寻找一个查询dsl谓词，该谓词给出了我的所有出版物，其中任何Author.name包含某个字符串，例如“汉斯”

我试过了：

QPublication publication = QPublication.publication;
QAuthor author = QAuthor.author;
publication.authors.containsValue(JPAExpressions.selectFrom(author).where(author.lastName.containsIgnoreCase("Hans")));

但是，如果名称中包含“ Hans”的作者不止一个，这将引起抱怨。是否像Set一样有publication.authors.anyValue().name.equalsIgrnoreCase("Hans")这样的贴子？

最佳答案

我找到了一个具有联接和自定义存储库实现的解决方案：

public class PublicationRepositoryImpl extends QueryDslRepositorySupport
   implements PublicationRepositoryCustom {

@Override
public Page<Publication> findByAnyAuthorName(String name, PageRequest pageRequest) {
   QPublication publication = QPublication.publication;
   JPQLQuery<Publication> query = from(publication);
   QAuthor author = QAuthor.author;
   query.join(publication.authors, author);
   query.where(author.name.containsIgnoreCase(name);
   JPQLQuery<Publication> pagedQuery = getQuerydsl()
      .applyPagination(pageRequest, query);

   return PageableExecutionUtils.getPage(pagedQuery.fetch(), pageRequest,
    () -> query.fetchCount());
}