我有一个具有文件属性的 Post 实体:
@Entity
public class Post extends Model {
@Id
private long id;
@ManyToOne
private PostType postType;
@ManyToOne
private User user;
@ManyToOne
private Category category;
@OneToMany (cascade = CascadeType.PERSIST)
private List<ImageLink> files;
private String description;
private int likes;
private int messages;
private boolean liked;
private boolean saved;
private Date timesTamp;
//getters and setters
}
我尝试在传递 RawSql 后获取属性文件(我还获取其他属性):
public Result test(){
long user_id = 1;
String sql =
"SELECT p.id, p.description, p.likes, p.times_tamp, u.id, " +
"u.name, u.phone, u.profile_url, u.rate, u.rate_count, c.id, " +
"EXISTS ( " +
"SELECT * " +
"FROM likes " +
"WHERE p.id = likes.post_id " +
"AND likes.user_id = "+user_id +
") AS liked "+
"FROM post p " +
"JOIN user_ u ON u.id = p.user_id "+
"JOIN category c ON c.id = p.category_id";
RawSql rawSql = RawSqlBuilder
.parse(sql)
.tableAliasMapping("u", "user")
.columnMapping("c.id", "category.id")
.create();
List<TestEntity> data = TestEntity.finder
.query()
.setRawSql(rawSql)
.fetch("files.image", "url")
.findList();
return ok(Ebean.json().toJson(data));
}
问题是,当我使用 Ebean.json().tojson(data) 返回查询结果时,未返回 files 属性。 这是返回的结果:
{
"id": 1,
"user": {
"id": 18,
"name": "smozi_shop",
"phone": "+22969298229",
"profileUrl": null,
"rate": 0.0,
"rateCount": 0
},
"category": {
"id": 1
},
"description": "smozi",
"likes": 1,
"liked": false,
"timesTamp": 1575956493968
}
注意到,当我使用 json.toJson(data) 返回结果时,它返回了 Post 实体的所有属性 我可以使用 json.toJson(data) 但在网络上加载数据会很繁重。
我只想检索(选择)所需的属性(包括文件属性)。
谢谢
最佳答案
您还需要在 ImageLink 上进行 JOIN,以将其包含在结果集中。
关于java - Ebean无法获取oneToMany关系,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59490802/