Question

我将Spring Boot 2与jpa和hibernate实现一起使用

我的某些实体

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Samplings {

    @Id
    @GenericGenerator(name = "samplings_id_seq", strategy = "com.permacon.lcm.model.SamplingSequenceGenerator")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "samplings_id_seq")
    private Integer id;

    @OneToMany(mappedBy = "sampling", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Samples> samples = new ArrayList<>();

    ...
}


@Entity
public class Samples {
    @EmbeddedId
    private SampleId id;

    @MapsId("samplingId")
    @ManyToOne(optional = false)
    private Samplings sampling;

    @OneToOne(mappedBy = "sample", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
    private TestSamples testSamples;

    ...
}

@Entity
public class TestSamples {
    @Id
    @SequenceGenerator(name = "test_samples_id_seq", sequenceName = "test_samples_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "test_samples_id_seq")
    private Integer id;

    @OneToOne(fetch = FetchType.LAZY)
    private Samples sample;


    @OneToOne(mappedBy = "testSample", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private Absorptions absorptionTest;

    @OneToOne(mappedBy = "testSample", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private Compressions compressionTest;

}

ALTER TABLE ONLY test_samples
    ADD CONSTRAINT test_samples_id_constraint FOREIGN KEY (sample_sample_letter, sample_sampling_id) REFERENCES samples(sample_letter, sampling_id);

实际上，要删除示例，我使用迭代器，然后删除所需的一个。

for (Iterator iterator = samples.iterator(); iterator.hasNext();) {
    Samples next = (Samples) iterator.next();

    ...
     iterator.remove();
}

如果我删除不带TestSamples的样本，则工作正常，如果存在，则失败，并出现违规约束（test_samples_id_constraint）

然后我看到休眠状态对采样表进行了更新，在采样表中进行了删除，但是它与TestSamples无关，与absorptionTest和compressionTest无关。

有什么主意吗？

我需要手动执行某些操作还是删除操作应该是自动的？

我全都掌握了。

Answer 1

让我们添加有关TestSample实体中外键中的列的信息

@OneToOne(fetch = FetchType.LAZY)    
@JoinColumns({
        @JoinColumn(name="sample_sample_letter", referencedColumnName="sample_letter"),
        @JoinColumn(name="sample_sampling_id", referencedColumnName="sampling_id")
    })
private Samples sample;

enter link description here

全部删除对象

1 个答案: