ibatis中iterate的用法

PersonDaoImp如下:

   /**
    * 删除性别为man,年龄为 11,12 的Person记录
    */
  public int deletePerson(Map<String, Object> map) {
         
         List<Person> personList=new ArrayList<Person>();

         Person p1=new Person(11);
         person p2=new Person(12);
         personList.add(p1);
         personList.add(p2);

         map.put("personList", personList);

         map.put("sex",'man');
         return getSqlMapClientTemplate().delete(
                                 "person.deletePerson", map);
     }

person.xml如下:

<!-- 删除相应的person记录 -->
  <delete id="deletePerson" parameterClass="map">

    delete from 表名 where      sex=#sex#         
        <iterate prepend="and" property="personList" open="("
          close=")" conjunction="or">
          age=$personList[].age$
        </iterate> 
       
  </delete>

输出sql如下:
delete from 表名 where sex='man' and (age =11 or age=12)

当然你也可以这么写:
person.xml如下:

<!-- 删除相应的person记录 -->
  <delete id="deletePerson" parameterClass="map">

    delete from 表名 where      sex=#sex#     and age in   
        <iterate property="personList" open="("
          close=")" conjunction=",">
          $personList[].age$
        </iterate> 
       
  </delete>

输出sql如下:
delete from 表名 where sex='man' and  age in (11 ,12)

最后Person代码大致如下:[size=medium][/size]

public class Person{
  public Person(int age){
      this.age=age;
  }
  /**
    * 年龄
    */
  private int age;
  /**
    * 性别
    */
  private String sex;
  
   //get/set方法略
   ...
 }//end of Person

本文出自 “sunfish 翻车鱼” 博客，请务必保留此出处http://sunfish.blog.51cto.com/417500/108315