DictDao.xml

<?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="com.govmade.modules.system.dao.DictDao">

	<select id="selectChilds" resultType="DictEntity">
		select value,name from
		system_dicts where pid = (select id from system_dicts where value = #{pValue})
	</select>

</mapper>