Mybatis 批量insert

<insert id="insert" parameterType="ArrayList">

     insert into XXX(id,name,type)

      <foreach collection="list" item="item" index="index" separator="union all">

          select  #{item.id,jdbcType=INTEGER},#{item.name,jdbcType=VARCHAR},#{item.type,jdbcType=INTEGER} from dual

      </foreach>

</insert>

dao:

public Integer insert(List<User> list){

   return sqlSession.insert("userMapper.insert",list);

}