Mybatis Oracle数据库分页的两种Mapper写法(mysql分页转oracle分页)

我们都知道mysql分页很简单,limit语句即可。

select * from student limit pageNo,pageSize

但是oracle分页有点特殊，下面给出两种oracle分页mapper文件的写法，功能和上面mysql分页相同，可以互相转化。
1.第一种 CDATA方式

<select id="selectAllByPage" resultMap="BaseResultMap" parameterType="map">
	select * from (select TMP_PAGE.*,ROWNUM ROW_ID from (
	select * from student
	<if test="pageNo!=null and pageSize!=null">
	<![CDATA[)TMP_PAGE) where ROW_ID <=${pageSize*pageNo} AND ROW_ID > ${pageSize*(pageNo-1)}]]>
	</if>
</select>

2.第二种方式

<select id="selectAllByPage" resultMap="BaseResultMap" parameterType="map">
	select * from 
	<choose>
			<when test="pageNo!=null and pageSize!=null">
				(select t1.*,rownum rn from
				(select * from student
				<where>
						<if test="country!=null">
						country=#{country,jdbc=VARCHAR}
						</if>
				</where>
			)t1
			where rownum<=(#{pageNo,jdbc=INTEGER}*#{pageSize,jdbc=INTEGER})
			where rn>(#{pageNo,jdbc=INTEGER}-1)*#{pageSize,jdbc=INTEGER}
			<when>
			<otherwise>
			student
			</otherwish>
	</choose>
</select>