如何使用 SqlResultSetMapping 将 JPA NativeQuery 的结果集映射到 POJO [英] How to map the result set of a JPA NativeQuery to a POJO using SqlResultSetMapping
问题描述
我正在尝试使用 @SqlResultSetMapping 和 @ConstructorResult 将本机查询的结果映射到 POJO.这是我的代码:
I am attempting to map the results of a Native query to a POJO using @SqlResultSetMapping with @ConstructorResult. Here is my code:
@SqlResultSetMapping(name="foo",
classes = {
@ConstructorResult(
targetClass = Bar.class,
columns = {
@ColumnResult(name = "barId", type = Long.class),
@ColumnResult(name = "barName", type = String.class),
@ColumnResult(name = "barTotal", type = Long.class)
})
})
public class Bar {
private Long barId;
private String barName;
private Long barTotal;
...
然后在我的 DAO 中:
And then in my DAO:
Query query = em.createNativeQueryBar(QUERY, "foo");
... set some parameters ...
List<Bar> list = (List<Bar>) query.getResultList();
我已经读到此功能仅在 JPA 2.1 中受支持,但这就是我正在使用的.这是我的依赖:
I have read that this functionality is only supported in JPA 2.1, but that is what I am using. Here's my dependency:
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
我找到了一些资源,包括这个:@ConstructorResult mapping in jpa 2.1.但我仍然没有任何运气.
I found a couple of resources, including this one: @ConstructorResult mapping in jpa 2.1. But I am still not having any luck.
我错过了什么?为什么找不到SqlResultSetMapping?
What am I missing? Why can't the SqlResultSetMapping be found?
javax.persistence.PersistenceException: org.hibernate.MappingException: Unknown SqlResultSetMapping [foo]
推荐答案
@SqlResultSetMapping
注释不应放在 POJO 上.把它放在(任何)@Entity
类中.Unknown SqlResultSetMapping [foo]"告诉您,JPA 提供程序在名称foo"下看不到任何映射.请参阅我的另一个答案以获取正确示例
@SqlResultSetMapping
annotation should not be put on a POJO. Put it at (any) @Entity
class. "Unknown SqlResultSetMapping [foo]" tells you, that JPA provider doesn't see any mapping under name 'foo'. Please see another answer of mine for the correct example
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