我使用Hibernate来持久化继承的对象，但当我尝试将对象持久化到数据库中时，出现了以下错误信息：
org.springframework.dao.InvalidDataAccessResourceUsageException: Could not execute
JDBC batch update; SQL [update Widget set CONTAINER_ID=? where WIDGET_ID=?]; nested
exception is org.hibernate.exception.SQLGrammarException:
Could not execute JDBC batch update (...) Caused by: java.sql.BatchUpdateException: Table
'schema.widget' doesn't exist
这是我用来生成表格的类：
@Entity
@Table(name="CONTAINER")
public class Container {
(...)
private Set<Widget> widgets;
@OneToMany(targetEntity = Widget.class)
@JoinColumn(name="CONTAINER_ID", nullable=true)
public Set<Widget> getWidgets() {
return widgets;
}
public void setWidgets(Set<Widget> widgets) {
this.widgets = widgets;
}
}
@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public abstract class Widget {
private long id;
private int position;
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
@Column(name="WIDGET_ID")
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Column(name="POSITION")
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}
}
@Entity
@Table(name="TEXT_WIDGET")
public class TextWidget extends Widget {
(...)
}
@Entity
@Table(name="IMAGE_WIDGET")
public class ImageWidget extends Widget {
(...)
}
所以这意味着Hibernate正在寻找名为'widget'的表，但它没有被创建，这很合理，因为我选择了InheritanceType.TABLE_PER_CLASS选项，那么只有具体类才有一个表。在数据库中，我可以看到container、text_widget和image_widget表。然后当我尝试执行此代码并保存container时，就会出现上述错误：
Set<Widget> widgets = new HashSet<Widget>();
widgets.add(textw1); // instance of TextWidget
widgets.add(imgw1); // instance of ImageWidget
Container container1 = new Container();
container1.setWidgets(widgets);
感谢您的帮助！