hibernate注解生成表的繼承

在生成表的時候遇到了這樣一個問題，將主鍵放到父類中去，其他的實體表繼承主鍵

@Entity
@Table(name = "base_table")
public class BaseEntity {

	public BaseEntity() {
	}

	@Id
	@GenericGenerator(name = "idGenerator", strategy = "uuid")
	@GeneratedValue(generator = "idGenerator")
	@Column(name = "id", unique = true, nullable = false)
	protected String id;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

 如果這樣，那么生成的主表，會包含其他被繼承的表的所有不重復的字段

應改成：

@Entity
@Table(name = "base_table")
@MappedSuperclass
public class BaseEntity {

	public BaseEntity() {
	}

	@Id
	@GenericGenerator(name = "idGenerator", strategy = "uuid")
	@GeneratedValue(generator = "idGenerator")
	@Column(name = "id", unique = true, nullable = false)
	protected String id;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

 僅僅多加了一個

@MappedSuperclass