Hibernate 如何在EntityManager createNativeQuery中使用resultclass？

查看EntityManager的接口，我看到有一个用于创建带有结果类的本机查询的签名

/**
 * Create an instance of <code>Query</code> for executing
 * a native SQL query.
 * @param sqlString a native SQL query string
 * @param resultClass the class of the resulting instance(s)
 * @return the new query instance
 */
public Query createNativeQuery(String sqlString, Class resultClass);

经过大量研究，我仍然不清楚如何使用resultClass参数。 通常，本机查询的结果集与实体不同；它们通常是由多个函数/连接等组合而成的/派生的结果。那么有没有办法创建这样的类

public class MyCustomResultRow {
private String propa;
private String propb;
private UUID id;
...
}

然后像这样运行代码

List<MyCustomResultRow> results = createNativeQuery("some query", MyCustomResultRow.class).getResultList();

导入java.time.Instant

公共类代码SupportandCapacityResult{

private String waste_disposal_facility_id;
private String waste_code;
private Long latest_support_entry_id;
private Instant latest_support_entry_created;
private String latest_support_entry_comment;
private Long latest_capacity_entry_id;
private String latest_capacity_entry_type;
private String latest_capacity_entry_comment;
private Instant latest_capacity_entry_created;


public String getWaste_disposal_facility_id() {
    return waste_disposal_facility_id;
}

public void setWaste_disposal_facility_id(String waste_disposal_facility_id) {
    this.waste_disposal_facility_id = waste_disposal_facility_id;
}

public String getWaste_code() {
    return waste_code;
}

public void setWaste_code(String waste_code) {
    this.waste_code = waste_code;
}

public Long getLatest_support_entry_id() {
    return latest_support_entry_id;
}

public void setLatest_support_entry_id(Long latest_support_entry_id) {
    this.latest_support_entry_id = latest_support_entry_id;
}

public Instant getLatest_support_entry_created() {
    return latest_support_entry_created;
}

public void setLatest_support_entry_created(Instant latest_support_entry_created) {
    this.latest_support_entry_created = latest_support_entry_created;
}

public String getLatest_support_entry_comment() {
    return latest_support_entry_comment;
}

public void setLatest_support_entry_comment(String latest_support_entry_comment) {
    this.latest_support_entry_comment = latest_support_entry_comment;
}

public Long getLatest_capacity_entry_id() {
    return latest_capacity_entry_id;
}

public void setLatest_capacity_entry_id(Long latest_capacity_entry_id) {
    this.latest_capacity_entry_id = latest_capacity_entry_id;
}

public String getLatest_capacity_entry_type() {
    return latest_capacity_entry_type;
}

public void setLatest_capacity_entry_type(String latest_capacity_entry_type) {
    this.latest_capacity_entry_type = latest_capacity_entry_type;
}

public String getLatest_capacity_entry_comment() {
    return latest_capacity_entry_comment;
}

public void setLatest_capacity_entry_comment(String latest_capacity_entry_comment) {
    this.latest_capacity_entry_comment = latest_capacity_entry_comment;
}

public Instant getLatest_capacity_entry_created() {
    return latest_capacity_entry_created;
}

public void setLatest_capacity_entry_created(Instant latest_capacity_entry_created) {
    this.latest_capacity_entry_created = latest_capacity_entry_created;
}

}

然后我得到这个

javax.persistence.PersistenceException: org.hibernate.MappingException: Unknown entity: com.wastecenter.portal.backend.admin.CodeSupportAndCapacityResult

---

我认为，只要JPA提供者能够创建

MyCustomResultRow

的实例，并且能够将SQL结果的列映射到

MyCustomResultRow

bean的属性，这应该是可行的。如果映射不直接，可以使用

@SqlResultSetMapping

定义自定义映射。到底什么对您不起作用？根据我上面的编辑，我得到javax.persistence.PersistenceException:org.hibernate.MappingException:Unknown entity:com.wastecenter.portal.backend.admin.CodeSupportAndCapacityResult

javax.persistence.PersistenceException: org.hibernate.MappingException: Unknown entity: com.wastecenter.portal.backend.admin.CodeSupportAndCapacityResult