我有一个实体时间表:
@Entity @Table(name = TableUtils.TIMETABLE)public class Timetable {
private static final long serialVersionUID = -1307879048598194633L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = ColumnUtils.ID)
private long id;
@OneToMany(mappedBy = "timetable", cascade = {CascadeType.REMOVE, CascadeType.PERSIST})
private List<TimetableCell> timetableCells;
public List<TimetableCell> getTimetableCells() {
return timetableCells;
}
public void setTimetableCells(List<TimetableCell> timetableCells) {
this.timetableCells = timetableCells;
}
}
和实体时间表单元:
@Entity
@Table(name = TableUtils.TIMETABLE_CELL)
public class TimetableCell extends AbstractElement {
private static final long serialVersionUID = -8083688091896353882L;
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(name = ColumnUtils.WEEK_DAY_ID, nullable = false)
private WeekDay weekDay;
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(name = ColumnUtils.LESSON_HOUR_ID, nullable = false)
private LessonHour lessonHour;
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(name = ColumnUtils.TIMETABLE_ID, nullable = false)
private Timetable timetable;
...
}
首先,我使用weekDay和LessonHours创建时间表单元格。在将此列表设置为时间表并尝试保存之后。但是所有时间表单元格都使用空的weekDay和空的LessonHour保存。 我调试了在保存之前,还必须设置所有字段。
timetableRepository.save(timetable);
调试结果显示如下
答案 0 :(得分:1)
1) timetableCells
仅用以下级联类型标记:
@OneToMany(mappedBy = "timetable", cascade = {CascadeType.REMOVE, CascadeType.PERSIST})
2)周和小时的深度只有以下内容:
@ManyToOne(cascade = CascadeType.PERSIST)
3):如果您通过Timetable
在此处保存方法,并且该方法以前一直存在:
timetableRepository.save(timetable);
Spring Data JPA不会调用persist
,而是调用merge
。
级联不起作用可能是这种情况。如果将此添加到配置中,则可能会得到所需的内容:
cascade = {CascadeType.REMOVE, CascadeType.PERSIST, CascadeType.MERGE})
答案 1 :(得分:1)
我从TimetableCell的字段中删除了Cascade.Persist
。它对我有用,但我不知道这是什么问题。