2016-01-20 53 views
0

当前我正在尝试使用hibernate(版本4.3.Final)检索包含另一个hibernate bean关联的组合主键的对象。我使用的标准如下:Hibernate复合键嵌套对象标准从条款中缺失

session.createCriteria(IdentityIdentifierHibernateBean.class) 
     .setFetchMode("key.type", FetchMode.JOIN); 
     .createAlias("key.type","typeAlias",JoinType.INNER_JOIN); 
     .add(Restrictions.and(
       Restrictions.eq("key.value", "value"), 
       Restrictions.eq("typeAlias.id", "id value"))) 
     .list(); 

当运行此我得到的误差:

1. SQL Error: 0, SQLState: 42P01 
2. missing FROM-clause entry for table "typealias1_" 

其原因是显而易见的,当我查看生成的SQL,如下所示:

select 
    this_.type as type4_4_0_, 
    this_.value as value1_4_0_, 
    this_.id as id2_4_0_, this_.scope as scope3_4_0_ 
from 
    identityIdentifier this_ 
where 
    (this_.value=? and typealias1_.id=?) 

当运行createAlias(或createCritera)不休眠假设生成一个连接语句?我已经尝试了这两种方法,并尝试为复合主键创建别名。无论哪种方式,这些方法都不起作用,因为连接语句从不创建。这是一个解决嵌入式复合主键引用的嵌套hibernate bean的错误吗?还是我失去了一些东西....

仅供参考这里的Hibernate类的简化版本(的hashCode,equals和未列入制定者):

@Entity 
@Table(name = "identityIdentifier") 
public class IdentityIdentifierHibernateBean implements Serializable { 
    private IdentityIdentifierPrimaryKey key; 

    @EmbeddedId 
    public IdentityIdentifierPrimaryKey getKey() { 
     return key; 
    } 
} 

@Embeddable 
public class IdentityIdentifierPrimaryKey implements Serializable { 
    private String value; 
    private IdentityIdentifierTypeHibernateBean type; 

    @ManyToOne(fetch = FetchType.LAZY) 
    @JoinColumn(name = "type", referencedColumnName="id", unique = true, nullable = false) 
    public IdentityIdentifierTypeHibernateBean getType() { 
     return type; 
    } 

    @Column(name = "value", unique = false, nullable = false, length = 255) 
    public String getValue() { 
     return value; 
    } 
} 

@Entity 
@Table(name = "identityIdentifierType") 
public class IdentityIdentifierTypeHibernateBean implements Serializable { 
    private String id; 

    @Id 
    @Column(name = "id", unique = true, nullable = false, length=38) 
    public String getId() { 
     return id; 
    } 
} 

回答

0

试图获得API标准经过无数小时工作(我真的相信这是复合键破碎)我决定改用HQL查询来代替。大约20分钟后,我很容易得到一个工作查询。聪明的词,不要使用组合键和标准API。

Query query=session.createQuery(
      "select distinct identity from IdentityIdentifierHibernateBean as identity " 
      + "inner join identity.key.type as type " 
      + "where (identity.key.value=:value and type.id=:typeid)") 
      .setParameter("value", type.getIdentityIdentifierValue()) 
      .setParameter("typeid", type.getTypeOfIdentityIdentifier()); 

beanList = (List<IdentityIdentifierHibernateBean>) query.list();