如何解决JDBI 3:嵌套 SQLObject
我尝试使用 jdbi 3 收集存储在连接表中的复合对象。实体 event 1 -> n author 是数据结构的一个例子。它们通过保存在事件列中的 author_id 连接。
通过 join 可以轻松查询它们,但我无法使用 jdbi 的给定注释创建对象。你能告诉我我在使用 jdbi 时的错误,并给我机会用 jdbi 处理“复杂”的对象吗?
DAO 代码
@sqlQuery("SELECT e.id as e_id,e.name as e_name,e.start_time as e_start_time,e.lastupdated as e_lastupdated,a.id as a_id,a.name as a_name,a.mail_address as a_mail_address FROM event e INNER JOIN author a ON(e.author_id = a.id) WHERE e.id = :event_id")
@RegisterBeanMapper(value = Event.class,prefix = "e")
@RegisterBeanMapper(value = Author.class,prefix = "a")
List<Event> getFeedbackByEventId(@Bind("author_id") int authorId,@Bind("event_id") int eventId);
Event.java
@Data
public class Event {
private int id;
@NonNull
private String name;
private LocalDateTime startTime;
private LocalDateTime lastUpdated;
@NonNull
@nested("a")
private Author author;
private Feedback Feedback;
private List<Valuedindicator> valuedindicators;
}
作者.java
public class Author {
private static final Logger LOGGER = LoggerFactory.getLogger(Author.class);
private int id;
@NonNull
private String name;
@NonNull
private String mailAddress;
}
Result
[
{
"id": 1,"name": "Testveranstaltung","startTime": "1970-01-01T01:16:40","lastUpdated": "2021-01-14T17:15:09","author": null,"Feedback": null,"valuedindicators": null
}
]
如您所见,作者为空。所以我猜@nested 注释没有正确使用。
解决方法
在这种情况下,@Nested 应该不带 ("a") 使用。那行得通。
Event.java
@Data
public class Event {
private int id;
@NonNull
private String name;
private LocalDateTime startTime;
private LocalDateTime lastUpdated;
@Nested
private Author author;
private Feedback feedback;
private List<ValuedIndicator> valuedIndicators;
}
DAO
@SqlQuery("SELECT e.id as e_id,e.name as e_name,e.start_time as e_start_time,e.lastupdated as e_lastupdated,a.id as a_id,a.name as a_name,a.mail_address as a_mail_address FROM event e INNER JOIN author a ON(e.author_id = a.id) WHERE e.id = :event_id")
@RegisterBeanMapper(value = Event.class,prefix = "e")
@RegisterBeanMapper(value = Author.class,prefix = "a")
List<Event> getFeedbackByEventId(@Bind("author_id") int authorId,@Bind("event_id") int eventId);
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