MyBatis排序时使用order by 动态参数时需要注意，用$而不是# 用$传参时，直接将参数的值放在sql语句中，如：
<select id="getOpenSourceApkList" resultType="OpenSourceApkInfo" parameterType="Map" >
<![CDATA[
SELECT * FROM
(SELECT A.*, ROWNUM RN FROM
(SELECT * FROM t_OPENSOURCEAPKINFO where RECOMMEND =1 and VISIBILITY=2 ORDER BY ${orderKey} desc,ID)
A WHERE ROWNUM <= #{endNo})
WHERE RN >= #{beginNo}
]]>
</select>
Sql语句打印:SELECT * FROM (SELECT A.*, ROWNUM RN FROM (SELECT * FROM t_OPENSOURCEAPKINFO where RECOMMEND =1 and VISIBILITY=2 ORDER BY averagegrade desc) A WHERE ROWNUM <= ?) WHERE RN >= ?
参数：24(Integer), 1(Integer)
用#传参时，不会将参数直接放在sql中，如：
<select id="getOpenSourceApkList" resultType="OpenSourceApkInfo" parameterType="Map" >
<![CDATA[
SELECT * FROM
(SELECT A.*, ROWNUM RN FROM
(SELECT * FROM t_OPENSOURCEAPKINFO where RECOMMEND =1 and VISIBILITY=2 ORDER BY #{orderKey} desc,ID)
A WHERE ROWNUM <= #{endNo})
WHERE RN >= #{beginNo}
]]>
</select>
Sql语句打印:SELECT * FROM (SELECT A.*, ROWNUM RN FROM (SELECT * FROM t_OPENSOURCEAPKINFO where RECOMMEND =1 and VISIBILITY=2 ORDER BY ? desc) A WHERE ROWNUM <= ?) WHERE RN >= ?
参数：averagegrade(String), 24(Integer), 1(Integer)
最后执行的是order by 'averagegrade'
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