Springmvc+mybatis example code for paging

springmvc+mybatis makes paging sql statement, the code is as follows:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="ssmy.dao.UserDao">
<resultMap type="ssmy.dto.User" id="User">
 <!--<resultMap type="User" id="User"> 如果在sprin文件里配置初始化  mybatis里配置了别名就是有-->
        <!-- 用id属性来映射主键字段 -->
        <id property="id" column="id" jdbcType="INTEGER"/>
        <!-- 用result属性来映射非主键字段 -->
        <result property="userName" column="userName" jdbcType="VARCHAR"/>
        <result property="password" column="password" jdbcType="VARCHAR"/>
        <result property="trueName" column="trueName" jdbcType="VARCHAR"/>
        <result property="email" column="email" jdbcType="VARCHAR"/>
        <result property="phone" column="phone" jdbcType="VARCHAR"/>
        <result property="roleName" column="roleName" jdbcType="VARCHAR"/>  
    </resultMap>
<!--分页返回类型list 可以使用map User对应的是resultMap size每页的大小-->
<select id="find" resultMap="User" parameterType="Map">
 select t2.* from 
 ( select t1.*,rownum rn from t_user t1 
 <where> 
 <if test ="userName !=null and userName !=&#39;&#39; ">
 t1.userName like  &#39;%&#39;||#{userName,jdbcType=VARCHAR}||&#39;%&#39;
 </if>
 </where>
 ) t2
<where>
<if test ="start !=null and start !=&#39;&#39;">
<![CDATA[and t2.rn >=#{start}]]>
</if>
<if test ="size !=null and size !=&#39;&#39;">
and  <![CDATA[t2.rn <=#{size}]]>
 </if>
   </where>
</select>
<!--获取总记录数 -->
<select id="getTotal" parameterType="Map" resultType="java.lang.Integer">
select count(1) from t_user
<where> 
     <if test ="userName !=null and userName !=&#39;&#39; ">
  userName like &#39;%&#39;||#{userName,jdbcType=VARCHAR}||&#39;%&#39;
 </if>
       </where>
</select>
<!--<insert id="createser" parameterType="User">
insert into NEWS_USER (id,username,password,email,usertype)
    values (#{id,jdbcType=NUMERIC},#{username,jdbcType=VARCHAR},
    #{password,jdbcType=VARCHAR},#{email,jdbcType=VARCHAR},1) 
    <selectKey resultType="int" order="BEFORE" keyProperty="id"> 
    select seq_id.nextval from dual 
    </selectKey>
</insert>-->
</mapper>

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