无法在@onetomany关系中删除spring数据jpa

Question

在我的春季启动程序中，我下面有一个LineItem实体是代码

@Entity
@Table(name = "scenario_lineitem")
@Data
@NoArgsConstructor
public class LineItem implements Cloneable {

    private static Logger logger = LoggerFactory.getLogger(GoogleConfigConstant.class);

    @Id
    @GeneratedValue(strategy = IDENTITY)   
    private BigInteger lineItemId;

    @Column
    private String name; 

    @OneToMany(fetch = FetchType.LAZY, cascade = { CascadeType.ALL, CascadeType.PERSIST, CascadeType.MERGE })
    @JoinColumn(name = "line_item_meta_id")
    private List<QuickPopValue> quickPopValues;   
}

另一个实体是

@Entity
@Table(name = "quick_pop_value")
@Data
@NoArgsConstructor
public class QuickPopValue implements Cloneable {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "quick_pop_value_id", columnDefinition = "bigint(20)", unique = true, nullable = false)
    private BigInteger quickPopValueId;

    @Column(name = "column_name")
    private String columnName;

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

    @Column(name = "formula", columnDefinition = "longtext")
    private String formula;
}

现在，我试图一个一个地删除QuickPopValue，但是它没有被删除，也没有任何异常。

下面是删除代码：

List<QuickPopValue> quickPopValues = sheetRepository.findByColumnName(columnName);
for (QuickPopValue qpValue : quickPopValues) {
    quickPopValueRepository.delete(qpValue);
}                       

Answer 1

当已删除的对象在当前会话中保留时，会发生这种行为。

for (QuickPopValue qpValue : quickPopValues) {
    // Here you delete qpValue but this object persisted in `quickPopValues` array which is 
    quickPopValueRepository.delete(qpValue);
}   

要解决此问题，您可以尝试按ID删除

@Modifying
@Query("delete from QuickPopValue t where t.quickPopValueId = ?1")
void deleteQuickPopValue(Long entityId);

for (QuickPopValue qpValue : quickPopValues) {
    quickPopValueRepository.deleteQuickPopValue(qpValue.getQuickPopValueId());
}  

Answer 2

假设您正在使用Spring Data-CrudRepository提供了deleteAll(Iterable<? extends T> entities)更好地使用它，即

quickPopValueRepository.deleteAll(quickPopValues)