这HQL导致极大帮助的“错误命名查询”消息HQL错误命名查询子查询
"FROM courseform c WHERE c.application.application IN
(SELECT a.application FROM application a WHERE a.applicant=: applicant)"
的CourseForm具有与该应用程序OneToOne单向关系(如果它会这个可能就是双向的帮帮我)。反过来,申请人与申请人具有相同的单向OneToOne关系。一个申请人可以有很多申请。
下面是(删节)定义
CourseForm
@Entity
@NamedQueries({
@NamedQuery(name = "CourseForm.findByApplicant",
query = "FROM courseform c WHERE c.application.application IN
(SELECT a.application FROM application a WHERE a.applicant=: applicant)") })
public class CourseForm implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
long id;
@Enumerated(EnumType.STRING)
private Career career;
private String academicPlan;
private String courseName;
@Enumerated(EnumType.STRING)
private ModeOfAttendance modeOfAttendance;
@OneToOne
@JoinColumn(name = "application_fk")
private Application application;
...
}
应用
@Entity
public class Application implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
long applicationNumber;
@OneToOne
@JoinColumn(name = "applicant_fk")
private Applicant applicant;
@Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDateTime")
private LocalDateTime lastUpdate = LocalDateTime.now();
@Type(type = "org.jadira.usertype.dateandtime.joda.PersistentLocalDateTime")
private LocalDateTime submitted = null;
public Application() {
}
申请人
@Entity
@NamedQueries({ @NamedQuery(name = "Applicant.findByApplicantID",
query = "FROM Applicant a WHERE a.applicantID= :applicantID") })
public class Applicant implements Serializable {
private static final long serialVersionUID = -7210042752148566673L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
long id;
private String applicantID;
Applicant() {
}
我也引用了CourseForm到应用程序关系中的列名称,并且向Applicant申请了一个ManyToOne关系,也引用了列名。 –