如何在Spring数据中使用规范连接多个列？

Question

我正在尝试将查询转换为规范Spring数据，该查询包含具有OR条件的JOIN操作。

这里是查询：

select u from User u inner join Operation o on (u.id = o.verificateur1 or u.id = o.verificateur2) where o.id not in (:ids)

我试图编写一个规范，但是在如何使用OR条件连接多列时受阻。

public class UserSpecification {

    public static Specification<User> UsersNotInSelectedOperations(final List<Long> operationId ){

        return new Specification<User>() {
            @Override
            public Predicate toPredicate(Root<User> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                Join<User, Operation> userJoinOp = root.join("fk_user1_id");
                final Path<User> users = userJoinOp.get("id");
                return criteriaBuilder.not(users.in(operationId));
            }
        };
    }

}

用户实体：] >>

@Entity
@Table(name = "aigle_user")
public class User extends AbstractEntity implements UserDetails {

    private static final long serialVersionUID = 2840226091237599675L;

    @Column(name = "mail", nullable = true)
    private String mail;

    @Column(name = "password")
    private String password;

    @Column(name = "is_activated")
    private boolean isActivated;

    @Column(name = "is_admin")
    private boolean isAdmin;

    @ManyToMany(cascade = { CascadeType.PERSIST })
    @LazyCollection(LazyCollectionOption.FALSE)
    @JoinTable(name = "aigle_group_user", joinColumns = @JoinColumn(name = "fk_user_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "fk_group_id", referencedColumnName = "id"))
    private Set<Group> groups;

    @ManyToMany(cascade = { CascadeType.PERSIST })
    @LazyCollection(LazyCollectionOption.FALSE)
    @JoinTable(name = "aigle_role_user", joinColumns = @JoinColumn(name = "fk_user_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "fk_role_id", referencedColumnName = "id"))
    private Set<Role> roles;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "destinataire", orphanRemoval = true)
    private Set<Tache> taches;

    @Column(name = "last_name", unique = false)
    private String lastName;

    @Column(name = "first_name", unique = false)
    private String firstName;

    @Column(name = "telephone")
    private String telephone;

    private String salesforceId;

-----
}
操作实体

] >>

public class Operation extends OperationField {

...
    @ManyToOne(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
    @JoinColumn(name = "fk_user1_id")
    private User verificateur1;

    @ManyToOne(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
    @JoinColumn(name = "fk_user2_id")
    private User verificateur2;
.....
}
我期望有一个规范可以代替上面的查询

我正在尝试将查询转换为规范Spring数据，该查询包含具有OR条件的JOIN操作。这是查询：从用户u内部联接中选择u u（u.id = o ....

Answer 1

尝试这样的事情

public static Specification<User> UsersNotInSelectedOperations(final List<Long> operationId) {
        return (root, query, builder) -> {
                Subquery<Operation> subquery = query.subquery(Operation.class);
                Root<Operation> operation = subquery.from(Operation.class);

                Predicate predicate1_1 = builder.equal(operation.get("verificateur1").get("id"), root.get("id"));
                Predicate predicate1_2 = builder.equal(operation.get("verificateur2").get("id"), root.get("id"));

                Predicate predicate1 = builder.or(predicate1_1 , predicate1_2); 
                Predicate predicate2 = operation.get("id").in(operationId).not();

                subquery.select(operation).where(predicate1, predicate2);

                return builder.exists(subquery);
        };
    }