我有实体时间表：
@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;
}
}
和一个实体的时间表单元：
@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,还设置了所有字段.
tiMetableRepository.save(tiMetable);
调试结果显示如下
最佳答案
1)tiMetableCells仅用以下级联类型标记：
@OneToMany(mappedBy = "tiMetable",CascadeType.PERSIST})
2)周和小时部门只有以下几点：
@ManyToOne(cascade = CascadeType.PERSIST)
3)如果您在此处传递时间表以保存方法,并且该方法之前一直存在：
tiMetableRepository.save(tiMetable);
Spring Data JPA不会调用持久化,而是合并.
为什么级联不起作用可能是这种情况.如果将其添加到配置中,则可能会得到所需的内容：
cascade = {CascadeType.REMOVE,CascadeType.PERSIST,CascadeType.MERGE})
