注意以下几点:一，CreateFilter()方法返回的是Query对象；二，createFilter()方法的{dy}个参数为一个持久化对象，比如Team对象是临时或脱管状态都不行)的集合.

(2) 使用filter-def和filter来定义一个过滤器，如下：(类级别的过滤器)----查询Student时候过滤
<hibernate-mapping>
   <!--把类和数表关联起来-->
   <hibernate-mapping package="pojo">
         <class name="Student" table="student" lazy="true">
              <id name="id" type="integer" column="id">
                   <generator class="native"/>
              </id>

              <property name="name" column="name" type="string" not-null="true" length="255"/>
  
              <many-to-one name="clazz" column="class_id" class="Classes"/>
  
             <filter name="studentFilter" condition=":name=name"></filter>
  
           </class>

           <query name="queryStudent_byName">
                     <![CDATA[
                              from Student s where s.name like :name       
                      ]]>
           </query>

          <!-- filter-def是公用的别的映射文件中也可以使用 -->
           <filter-def name="studentFilter">
                    <filter-param name="name" type="string"/>
            </filter-def>

</hibernate-mapping>

session.enableFilter("studentFilter").setParameter("name", "stu 19");
String hql = "from Student";
   Student student = (Student)session.createQuery(hql).uniqueResult();
   Assert.assertEquals("stu 19", student.getName());
   Assert.assertEquals(10, student.getClazz().getId().intValue());

（3）集合过滤器---对Classes中Student的过滤

<set name="students" table="student" cascade="all" inverse="true" lazy="true">
      <key column="class_id"/>
      <one-to-many class="pojo.Student"/>
      <filter name="studentFilter" condition=":name=name"></filter>
   </set>

session.enableFilter("studentFilter").setParameter("name", "stu 19");
   String hql = "from Classes";
   List<Classes> classesList = session.createQuery(hql).list();
   for (Classes classes : classesList) {
           Set<Student> students = classes.getStudents();
           if (students.size() == 0) {
                  System.out.println(classes.getName());
          } else {
                  for (Student student : students) {
                 Assert.assertEquals("stu 19", student.getName());
            }
      }

}

(4)编码形式

Classes classes = (Classes) session.get(Classes.class, 10);
Student student = (Student) session.createFilter(classes.getStudents(), "where this.name = 'stu 19'").uniqueResult();
   Assert.assertEquals(10, student.getClazz().getId().intValue());