使用 SpringData 和 QueryDSL-JPA 查询地图值

Question

我得到了以下数据结构

@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，它提供我的所有出版物，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，如果有多个作者的名字中包含“Hans”，这会报错。有没有像 publication.authors.anyValue().name.equalsIgrnoreCase("Hans") 这样的东西？

Answer 1

我找到了一个带有连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());
}

Answer 2

我认为你错过了 BooleanBuilder

在您的存储库中 - 试试这个

QPublication publication = QPublication.publication;
QAuthor author = QAuthor.author;
BooleanBuilder where= new BooleanBuilder();
where.and(publication.author.name.containsIgnoreCase(textToSearch));

//pass the where condition to the desired Repo method
repo.findAll(where);