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Forum:
Object Relational Mapping
Outer join between 3 entities in HQL
Hajdu Attila
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Posts: 6
posted 12 years ago
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Hi,
I have 2 normal tables, and a view table.
Curse.java:
@Entity @Table(name = "CURSES") public class Curse implements Serializable { @EmbeddedId @AttributeOverrides( { @AttributeOverride(name = "curseId", column = @Column(name = "CURSE_ID", nullable = false, length = 16)), @AttributeOverride(name = "semesterId", column = @Column(name = "SEMESTER_ID", nullable = false, length = 10)) }) private CurseId id; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "SEMESTER_ID", nullable = false, insertable = false, updatable = false) private Semester semester; @ManyToOne(fetch = FetchType.LAZY) @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "curse") private List<UserCurse> users = new ArrayList<UserCurse>(); }
UserCurse.java:
@Entity @Table(name = "USERS_CURSES") public class UserCurse implements java.io.Serializable { @EmbeddedId @AttributeOverrides( { @AttributeOverride(name = "userId", column = @Column(name = "USER_ID", nullable = false, length = 16)), @AttributeOverride(name = "curseId", column = @Column(name = "CURSE_ID", nullable = false, length = 16)), @AttributeOverride(name = "semesterId", column = @Column(name = "SEMESTER_ID", nullable = false, length = 10)) }) private UserCurseId id; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "USER_ID", nullable = false, insertable = false, updatable = false) private User user; @ManyToOne(fetch = FetchType.LAZY) @JoinColumns(value = { @JoinColumn(name = "CURSE_ID", referencedColumnName = "CURSE_ID", nullable = false, insertable = false, updatable = false), @JoinColumn(name = "SEMESTER_ID", referencedColumnName = "SEMESTER_ID", nullable = false, insertable = false, updatable = false) }) private Curse curse; }
And a view table
SELECT CURSE_ID, SEMESTER_ID, COUNT(USER_ID) AS USER_COUNT FROM USERS_CURSES GROUP BY CURSE_ID, SEMESTER_ID
View table reprezenter class:
@Entity @Table(name = "CURSES_VIEW") public class CursesView implements Serializable { @Id @Column(name = "CURSE_ID", insertable = false, updatable = false, nullable = false, length = 16) private String curseId; @Column(name = "SEMESTER_ID", insertable = false, updatable = false,nullable = false, length = 10) private String semesterId; @Column(name = "USER_COUNT", insertable = false, updatable = false, nullable = false, precision = 22, scale = 0) private BigDecimal userCount; }
I want to
select cur, usCurs.id.userId, curView.userCount from Curse cur left outer join cur.users usCurs with usCurs.id.userId = :userId left outer join CursesView curView
I catch: database.DataAccessLayerException: org.hibernate.hql.ast.QuerySyntaxException: Path expected for join!
Thank you!
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