JPA@OneToMany和复合PK
我正在做一个JPA项目。我需要在一个有三个主键的类上使用@OneToMany映射。您可以在此之后找到错误和类JPA@OneToMany和复合PK,jpa,persistence,primary-key,many-to-one,Jpa,Persistence,Primary Key,Many To One,我正在做一个JPA项目。我需要在一个有三个主键的类上使用@OneToMany映射。您可以在此之后找到错误和类 javax.persistence.PersistenceException: No Persistence provider for EntityManager named JTA_pacePersistence: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exce
javax.persistence.PersistenceException: No Persistence provider for EntityManager named JTA_pacePersistence: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory:
javax.persistence.PersistenceException
javax.persistence.PersistenceException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [JTA_pacePersistence] failed.
Internal Exception: Exception [TOPLINK-7220] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: The @JoinColumns on the annotated element [private java.util.Set isd.pacepersistence.common.Action.permissions] from the entity class [class isd.pacepersistence.common.Action] is incomplete. When the source entity class uses a composite primary key, a @JoinColumn must be specified for each join column using the @JoinColumns. Both the name and the referenceColumnName elements must be specified in each such @JoinColumn.
at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:643)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:196)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at isd.pacepersistence.common.DataMapper.(Unknown Source)
at isd.pacepersistence.server.MainServlet.getDebugCase(Unknown Source)
at isd.pacepersistence.server.MainServlet.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:290)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
以下是我的类的源代码:
行动:
@Entity
@Table(name="action")
public class Action {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int num;
@ManyToOne(cascade= { CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.REFRESH })
@JoinColumn(name="domain_num")
private Domain domain;
private String name;
private String description;
@OneToMany
@JoinTable(name="permission", joinColumns= { @JoinColumn(name="action_num", referencedColumnName="action_num", nullable=false, updatable=false) }, inverseJoinColumns= { @JoinColumn(name="num") })
private Set<Permission> permissions;
public Action() {
}
许可证PK:
@SuppressWarnings("serial")
@Entity
@Table(name="permission")
public class Permission implements Serializable {
@EmbeddedId
private PermissionPK primaryKey;
@ManyToOne
@JoinColumn(name="action_num", insertable=false, updatable=false)
private Action action;
@ManyToOne
@JoinColumn(name="entity_num", insertable=false, updatable=false)
private isd.pacepersistence.common.Entity entity;
@ManyToOne
@JoinColumn(name="class_num", insertable=false, updatable=false)
private Clazz clazz;
private String kondition;
public Permission() {
}
错误消息似乎很清楚:您需要将复合PK的三列声明为
@joincolm
,并且必须为每一列指定名称和引用列名称。我没有测试映射,但尝试以下操作:
@OneToMany
@JoinTable(name="permission", joinColumns= {
@JoinColumn(name="col1", referencedColumnName="col1", nullable=false, updatable=false),
@JoinColumn(name="col2", referencedColumnName="col2", ...),
@JoinColumn(name="col3", referencedColumnName="col3", ...)
}, inverseJoinColumns= { @JoinColumn(name="num") })
private Set<Permission> permissions;
@OneToMany
@JoinTable(name=“permission”,joinColumns={
@JoinColumn(name=“col1”,referencedColumnName=“col1”,nullable=false,updateable=false),
@JoinColumn(name=“col2”,referencedColumnName=“col2”,…),
@JoinColumn(name=“col3”,referencedColumnName=“col3”,…)
},inverseJoinColumns={@JoinColumn(name=“num”)})
私有设置权限;
早上好
在花了一整天的时间研究JPA和@OneToMany如何使用复合PK之后,我找到了一个解决方案。为了让它工作,我使用了@OneToMany的参数mappedBY。正如您在代码示例中看到的,我将权限集映射为类权限的属性action。就这样!知道就简单
FF
动作类:
@Entity
@Table(name="action")
public class Action {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int num;
@ManyToOne(cascade= { CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.REFRESH })
@JoinColumn(name="domain_num")
private Domain domain;
private String name;
private String description;
@OneToMany(mappedBy="action")
private Set<Permission> permissions;
谢谢你的回答,但我试图将我的复合PK的三列声明为@joincolm,它也给了我一个错误。错误与第一个相反。它要求使用@JoinColumn声明一个主键,而不是三个。无论如何,我找到了解决办法!我现在要发布一个带有代码示例的答案。看起来您复制了“PermissionPK”列表中的“Permission”源代码。
@Entity
@Table(name="action")
public class Action {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int num;
@ManyToOne(cascade= { CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.REFRESH })
@JoinColumn(name="domain_num")
private Domain domain;
private String name;
private String description;
@OneToMany(mappedBy="action")
private Set<Permission> permissions;
@SuppressWarnings("serial")
@Entity
@Table(name="permission")
public class Permission implements Serializable {
@EmbeddedId
private PermissionPK primaryKey;
@ManyToOne
@JoinColumn(name="action_num", insertable=false, updatable=false)
private Action action;