java - Hibernate 使用 where 子句中的连接列创建查询

Question

我有一个表，其表结构如下

package com.abc.domain;


@Entity
@Table(
    name = "ENTITY_DTL"
)

public class MyEntityDtl implements Serializable {

    private static final long serialVersionUID = 1L;
    private static final int NATLTY_CD_LENGTH = 3;


    @Id
    @Column(
        name = "MY_ENTITY_DTL_ID",
        unique = true,
        nullable = false
    )
    @GeneratedValue(
        strategy = GenerationType.SEQUENCE,
        generator = "myEntityDtlIdSeq"
    )
    @SequenceGenerator(
        name = "myEntityDtlIdSeq",
        sequenceName = "MY_ENTITY_DTL_ID_SEQ",
        allocationSize = 1
    )
    private Long MyEntityDtlId;



    @ManyToOne(
        fetch = FetchType.LAZY
    )
    @JoinColumns({@JoinColumn(
    name = "ENTITY_ID",
    referencedColumnName = "ENTITY_ID",
    nullable = false
), @JoinColumn(
    name = "ENTITY_TYPE_CD",
    referencedColumnName = "ENTITY_TYPE_CD",
    nullable = false
)})
    private MyEntity myEntity;


    /* 
    other columns and their getter setter 
    */


}

这里-我想要实现的是-类似这样的

使用此列 - ENTITY_ID 和 ENTITY_TYPE_CD 将 MyEntityDtl 表与 Abc 表连接起来。

如何在查询中不使用 MyEntity 表来实现它。

因为在这种情况下我需要额外加入

感谢任何帮助，提前谢谢

Answer 1

由于获取类型是惰性的，我直接使用连接列来创建连接，不会因为获取类型lzay而影响查询性能 -

 Query query = getEntityManager().createQuery("SELECT abc FROM ABC abc, MyEntityDtl medtl join medtl.myEntity  me " +
                        " WHERE vsf.rqstId = me.entityId AND  " +
                        " me.entityTypeCd = '?' AND " +
                        " medtl.SOME_OTHER_COLUMN= '?' " ;
                query.setParameter("entityTypeCd", VALUE);
                query.setParameter("SOME_OTHER_COLUMN", VALUE);