用於將資料庫查詢到的資料打包成臨時的包裝類，結合EL表示式來展示，例如報表什麼的。

基本就分兩種，寫法如下：

hql：Query query = session.createQuery("select id , account , password  from User")

                .setResultTransformer(Transformers.aliasToBean(U.class));

例如：

1. sqlQuery.addScalar("id"
   ,StandardBasicTypes.INTEGER);  

使用方法舉例如下：

 public List findByOid(Object oid) {
  log.debug("finding all WatershedAnalyse instances");
  Session session=getSessionFactory().openSession();
  SQLQuery query=null;
  try {
   String queryString = "SELECT oid,bdatetime,basin_code,p,e FROM basin_in WHERE oid="+oid;
   query=session.createSQLQuery(queryString);
   query.addScalar("oid", Hibernate.INTEGER);
   query.addScalar("bdatetime", Hibernate.STRING);
   query.addScalar("basin_code", Hibernate.STRING);
   query.addScalar("p", Hibernate.DOUBLE);
   query.addScalar("e", Hibernate.DOUBLE);

   query.setResultTransformer(Transformers.aliasToBean(BasinIn.class));  
   return query.list();
  } catch (RuntimeException re) {
   log.error("find all failed", re);
   throw re;
  }finally{
   session.close();
  }
 } 

使用setResultTransformer  要使用query.addScalar("oid", Hibernate.INTEGER)指定
返回型別 否則會丟擲以下異常。

Caused by: org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.serialssoloutions.database.entity.ProductInfo.id

Caused by: java.lang.IllegalArgumentException: argument type mismatch

BasinIn  bean如下

public class BasinIn  implements java.io.Serializable {
     private Integer oid;
     private String bdatetime;
     private String basin_code;
     private Double p;
     private Double e;
    public BasinIn() {
    }

public String getBasin_code() {
 return basin_code;
}

public void setBasin_code(String basin_code) {
 this.basin_code = basin_code;
}

public Integer getOid() {
 return oid;
}

public void setOid(Integer oid) {
 this.oid = oid;
}

public Double getP() {
 return p;
}

public void setP(Double p) {
 this.p = p;
}

public Double getE() {
 return e;
}

public void setE(Double e) {
 this.e = e;
}

public String getBdatetime() {
 return bdatetime;
}

public void setBdatetime(String bdatetime) {
 this.bdatetime = bdatetime;
}  

}