springmvc+mybatis 做分页sql 语句实例代码

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://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 !='' ">
 t1.userName like '%'||#{userName,jdbcType=VARCHAR}||'%'
 </if>
 </where>
 ) t2
 <where>
 <if test ="start !=null and start !=''">
 <![CDATA[and t2.rn >=#{start}]]>
 </if>
 <if test ="size !=null and size !=''">
 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 !='' ">
 userName like '%'||#{userName,jdbcType=VARCHAR}||'%'
 </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>