我在使用HQL查询时遇到了一些问题:
@Query("Select s from Sport s JOIN s.categories as c where s.sportId = :sportId and c.categoryId = :categoryId")
Iterable<Sport> findByCategoryIdAndSportId(@Param("sportId")Long sportId, @Param("categoryId")Long categoryId);
此查询返回所有类别(似乎忽略第二个AND子句),但仅返回与sportId匹配的运动。
这些是代表体育和类别的课程:
@Entity
@Table(name = "Sports")
public class Sport implements Serializable
{
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long sportId;
@OneToMany(mappedBy = "sportId")
@ApiModelProperty(required = true)
@JsonManagedReference
private Set<Category> categories;
@Column
private String sportName;
....get and set
和
@Entity
@Table(name = "Categories")
public class Category implements Serializable
{
@ManyToOne
@JoinColumn(name = "sportId", nullable = false)
@JsonBackReference
private Sport sportId;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long categoryId;
..get and set
修改
假设:
Sport:
|sportId | SportName
|1 |Rugby
|2 |Basket
|3 |Tennis
和类别:
|categoryId | CategoryName | sportId|
|1 |Italy |1 |
|2 |England |2 |
|3 |USA |1 |
|1 |Spain |2 |
我想用我的查询获取(假设sportId = 1且categoryId = 1):
| sportId | SportName | categoryId | CategoryName |
1 Rugby 1 Italy
有人可以帮帮我吗?
提前致谢
答案 0 :(得分:0)
那不行。请看this。
您可以反转查询以获取具有某些特定运动的类别:
Select c from Categories c JOIN Sport s where c.categoryId = :categoryId and s.sportId = :sportId