我有1個實體呼叫項目,我希望能夠鏈接父項與兒童。使用連接表來創建父/子關係。我一直沒有得到任何好的文檔。所以,如果任何人有任何想法,我都耳朵。JPA自我加入使用JoinTable
這就是我所擁有的......大部分時間都在工作。
public class Item implements java.io.Serializable {
@Id
private Long id;
@ManyToOne(optional = true, fetch = FetchType.LAZY)
@JoinTable(name = "ITEMTOITEM", joinColumns = { @JoinColumn(name = "ITEMID") }, inverseJoinColumns = { @JoinColumn(name = "PARENTITEMID") })
private Item parent;
@OneToMany(mappedBy = "parent", fetch = FetchType.LAZY)
private List<Item> children;
}
有時,當我想帶回被綁定到這個項目表我得到以下的錯誤對象:
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.webflow.engine.ActionExecutionException: Exception thrown executing [[email protected] targetAction = [email protected], attributes = map['method' -> 'handleEntry']] in state 'oneTimeChargesAndFeesView' of flow 'in-flow' -- action execution attributes were 'map['method' -> 'handleEntry']'; nested exception is Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.0.1 (Build b04-fcs (04/11/2008))): oracle.toplink.essentials.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: ORA-00904: "PARENTITEM_ITEMID": invalid identifier
Error Code: 904
Call: SELECT ITEMID, ITEMSHORTDESC, EFFENDDATE, ITEMDESC, PARENTITEM_ITEMID, ITEMTYPECODE FROM ITEM WHERE (ITEMID = ?)
bind => [1250]
Query: ReadObjectQuery(com.domain.Item)
任何幫助,將不勝感激。
在這裏,我已經把表圖[點擊這裏](http://dbdsgnr.appspot.com/app#agdkYmRzZ25ycg8LEgZTY2hlbWEY0riZAQw)。 – jtoepfer 2013-03-05 15:36:04
最後一點需要注意的是我需要使用eclipselink和toplink-essentials。所以我只能使用JPA 1.0映射。 – jtoepfer 2013-03-05 16:04:22