Question

我班上有一个元素集合：

public class InstancePdo implements Comparable<InstancePdo> {

  @Id
  @Column(name = COLUMN_NAME_ID, columnDefinition = "UUID")
  private UUID id;

  @Id
  @Column(name = COLUMN_NAME_VERSION, columnDefinition = "int")
  private int version = -1;

  @ElementCollection(fetch = FetchType.LAZY)
  @CollectionTable(name = "settings", joinColumns = {
      @JoinColumn(name = COLUMN_NAME_ID, referencedColumnName = COLUMN_NAME_ID, nullable = false, updatable = true),
      @JoinColumn(name = "COLUMN_NAME_VERSION", referencedColumnName = COLUMN_NAME_VERSION, nullable = false, updatable = true) })
  private Set<SettingPdo> settings;
}

现在，设置如下：

@Embeddable
@Table(
    name = "settings",
    uniqueConstraints = @UniqueConstraint(
        columnNames = { "id", "version", "key", "type" }))
public class SettingPdo implements Comparable<SettingPdo> {

  @Column(name = "type", nullable = false)
  private String type;

  @Column(name = "key", nullable = false)
  private String key;


  @Column(name = "value", columnDefinition = "CLOB NOT NULL", )
  @Lob
  @Convert(converter = JsonNodeStringConverter.class)
  private String value;
}

现在，如果我用一个Merge操作替换一个instancePDO，就会生成一个删除语句，如下所示：

Error Code: 932
Call: DELETE FROM settings WHERE ((((((key = ?)) AND (type = ?)) AND (value = ?)) AND (id = ?)) AND (version = ?))
        bind => [4 parameters bound]

现在，问题是Oracle不接受CLOB（或任何其他LOB）列上的WHERE子句。我把所有类似的线程都读取了所有堆栈溢出，如下所示：https://stackoverflow.com/a/33833399/1549977

如果使用Set并使元素Column不为null，则 hibernate将使用join列和元素创建主键列。

如您所见，Eclipselink仍会生成包含CLOB字段比较的删除语句。

等于的Hashcode也是正确的。

我不知道下一步该做什么。我的课程（或数据库）有什么问题？由于我遇到了Oracle，如何强制JPA不在delete语句中包含某些特定的列？

提前致谢！

Eclipselink：JPA＆lt; DELETE FROM语句包括与CLOB的比较

0 个答案: