Spring JPA存储库动态查询

Question

目前我一直在使用以下Spring JPA存储库自定义查询,

 @Query("SELECT usr FROM User usr  WHERE usr.configurable = TRUE "
              + "AND (" +
                        "lower(usr.name) like lower(:filterText) OR lower(usr.userType.classType.displayName) like lower(:filterText) OR lower(usr.userType.model) like lower(:filterText)"
              +      ")"
              + "")
  public List<User> findByFilterText(@Param("filterText") String filterText, Sort sort);

我需要修改这个查询时，筛选文本将是逗号分隔的值。但按照以下方式，它将是一个动态查询，我如何执行它。

我需要构建动态查询,

String sql = "SELECT usr FROM User usr WHERE usr.configurable = TRUE";

for(String word : filterText.split(",")) {
                sql += " AND (lower(usr.name) like lower(:" + word + ") OR lower(usr.userType.classType.displayName) like lower(:" + word + ") OR lower(usr.userType.model) like lower(:" + word + "))";
}

Answer 1

根据JB Nizet和spring-data文档，您应该使用自定义接口+存储库实现。

使用以下方法创建接口：

public interface MyEntityRepositoryCustom {
    List<User> findByFilterText(Set<String> words);
}

创建实现：

@Repository
public class MyEntityRepositoryImpl implements MyEntityRepositoryCustom {
    @PersistenceContext
    private EntityManager entityManager;

    public List<User> findByFilterText(Set<String> words) {
        // implementation below
    }
}

public interface MyEntityRepository extends JpaRepository<MyEntity, Long>, MyEntityRepositoryCustom {
    // other query methods
}

dao.findByFilterText(new HashSet<String>(Arrays.asList(filterText.split(","))));

您要连接的字必须是有效的JPQL标识符，即:后跟一个java标识符开始，也可以后跟某个java标识符部分。这意味着如果您的CSV包含foo bar,baz，您将尝试使用foo bar作为标识符，您将得到一个异常。

您可以使用criteriaBuilder以安全的方式构造查询：

public List<User> findByFilterText(Set<String> words) {
    CriteriaBuilder cb = entityManager.getCriteriaBuilder();
    CriteriaQuery<User> q = cb.createQuery(User.class);
    Root<User> user = q.from(User.class);

    Path<String> namePath = user.get("name");
    Path<String> userTypeClassTypeDisplayName = 
                     user.get("userType").get("classType").get("displayName");
    Path<String> userTypeModel = user.get("userType").get("model");
    List<Predicate> predicates = new ArrayList<>();
    for(String word : words) {
        Expression<String> wordLiteral = cb.literal(word);
        predicates.add(
                cb.or(
                    cb.like(cb.lower(namePath), cb.lower(wordLiteral)),
                    cb.like(cb.lower(userTypeClassTypeDisplayName),
                            cb.lower(wordLiteral)),
                    cb.like(cb.lower(userTypeModel), cb.lower(wordLiteral))
                )
        );
    }
    q.select(doc).where(
            cb.and(predicates.toArray(new Predicate[predicates.size()]))
    );

    return entityManager.createQuery(q).getResultList();
}