java - 带有空参数的 Spring 数据 jpa native 查询(PostgreSQL)

Question

问题是如何让我的原生查询接受空参数？

这是我的查询:

    @Query(value = "SELECT " +
            "   summaries.event_type as \"eventType\", " +
            "   summaries.institution_id as \"institutionId\", " +
            "   identifiers.id as \"studentIdentifierId\", " +
            "   identifiers.name as \"studentIdentifierName\" " +
            "FROM summaries " +
            "LEFT JOIN roles ON summaries.student_id=roles.id " +
            "LEFT JOIN identifiers ON roles.identifier_id=identifiers.id " +
            "WHERE " +
            "   summaries.student_id IS NOT NULL AND " +
            "   summaries.event_type IN (:eventTypes) AND " +
            "   (:identifierId IS NULL OR roles.identifier_id=:identifierId) " +
            "GROUP BY " +
            "   summaries.institution_id, " +
            "   summaries.student_id, " +
            "   identifiers.id, " +
            "   identifiers.name, " +
            "   summaries.event_type",
            nativeQuery = true)
    List<CustomProjection> findByCustomCondition(
            @Param("identifierId") Long identifierId,
            @Param("eventTypes") List<String> eventTypes);

现在，当我将 identifierId 作为 null 传递时，我收到错误消息:

InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet.
Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: bigint = bytea
  HINT: No operator matches the given name and argument types. You might need to add explicit type casts.

(:identifierId IS NULL OR roles.identifier_id=:identifierId) 行似乎在这里引起了问题，但无法真正找到好的解决方案，因为据我了解它应该有效通常(当我直接在 pgAdmin 上使用此查询时，它会正常工作，所以我很确定这是与映射相关的问题)。

我尝试转换标识符 (cast(:identifierId as bigint))，但没有成功。

附言。这是一个遗留项目，所以这些是我使用的版本:

compile group: 'org.springframework.data', name: 'spring-data-jpa', version: '1.11.6.RELEASE'
compile group: 'org.postgresql', name: 'postgresql', version: '42.2.2'
compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2.17.Final'

Answer 1

这是 Hibernate + PostgreSQL 的常见问题，解决方案是自己实现该方法，而不是让 Spring 为您实现。在实现中你必须做这样的事情

List<CustomProjection> findByCustomCondition(
        @Param("identifierId") Long identifierId,
        @Param("eventTypes") List<String> eventTypes) {
     // entityManager is acquired with the @PersistenceContext annotation as an injectable
     Query q = entityManager.createNativeQuery(..., CustomProjection.class);
     // the important part:
     q.setParameter("identifierId", 0L);
     q.setParameter("identifierId", identifierId);
     ...

第一次调用 setParameter 确保 Hibenate 使用正确的类型 setter ，第二次调用覆盖第一个值而不执行查询，并跳过类型检测。