Question

执行此查询时，我总是收到错误太多列。

SELECT o FROM Overlay o WHERE ( :coordinate ) IN ELEMENTS(o.blocksCoordinates)

如果我在sql中这样做，它可以工作：

Select * from Overlay overlay0_ where (0,0) in (select x, y from ...

Coordinate是一个带有x和y值的简单嵌入式实体。

@ElementCollection
private Set<Coordinate> blocksCoordinates = new HashSet<Coordinate>();

我的坐标实体：

@Embeddable
public class Coordinate implements Serializable {
    private static final long serialVersionUID = -5866341829302555966L;

    protected int x;
    protected int y;

我做错了什么？

Answer 1

反过来试试：

select o from Overlay o left outer join o.blocksCoordinates as c where c = :coordinate

或使用with关键字：

select o from Overlay o join o.blocksCoordinates as c with c = :coordinate

使用该查询应该返回任何叠加，其中c =坐标上的连接成功。

编辑：或者，尝试使用x和y值：

select o from Overlay o join o.blocksCoordinates as c with c.x = :x and c.y = :y

HQL子查询查询选择

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