小编Nee*_*eel的帖子

我正在尝试使用hibernate 3.3.2.GA执行sql本机查询.

我有以下查询.

session.createSQLQuery("SELECT {dept1.*}, {dept2.*} FROM Dept d1, Dept d2 WHERE d1.deptId = d2.deptId").
   addEntity("dept1",com.test.pojo.Dept.class).
   addEntity("dept2",com.test.pojo.Dept.class).
   list();

Dept类的映射文件是

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.test.pojo.Dept">
  <id column="deptId" name="deptId" type="long">
   <generator class="native"/>
  </id>
  <version name="version" access="field" column="version"></version>
  <property  name="deptName" type="string" column="deptName"/>

  <set name="emps" cascade="all" inverse="true">
     <key column="deptId"></key>
     <one-to-many class="com.test.pojo.Emp"/>
  </set>
</class>
</hibernate-mapping>

但为什么我得到以下错误？它将我的查询转换为

SELECT dept1.**deptId as deptId1_0_,**dept1.**version as version__0,**dept1.**deptName as deptName1_0 _,**dept2.**deptId as deptId1_1 _,**dept2.**version as version1_1 _,**dept2.**deptName as deptName1_1_**FROM Dept d1,Dept d2 WHERE …

我遵循该类的定义.

public class Test2<T extends Test3> {

     private T t ;


     public T foo() {
         Test3 test3 = new Test3();
         t = test3;  // I get compilation error here.**
         return t;
     }

}

class Test3 {

}

我在第t = test3行得到编译错误,说"类型不匹配无法从Test3转换为T;有什么问题？