JPA配置左连接

model层：

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Integer id         ;      
 private Integer client_type;      
                                   
 private String versionid   ;      
 private String down_url    ;      
                                   
 private Timestamp addtime  ;
  @ManyToOne
  @JoinColumn(name="client_type",updatable = false,insertable = false)
    private CntvClientServer cntvClientServer;
 

 
 @Transient
 private String servername;//临时字符串 

 

 public CntvSoftVersion(){}
 
 public CntvSoftVersion(CntvSoftVersion cn,String servername){
  super();
  this.id=cn.getId();
  this.client_type=cn.getClient_type();
  this.versionid=cn.getVersionid();
  this.down_url=cn.getDown_url();
  this.addtime=cn.getAddtime();
  
  this.servername=servername; 
 
  
 }

dto层：

StringBuffer hql_sb = new StringBuffer(" select new CntvSoftVersion(a,b.servername) from CntvSoftVersion a left join a.cntvClientServer b  where 1=1 ");