ibatis中iterate的用法[转载]

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:

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

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