fm-basics/fm-mybatis/src/main/resources/mapper/SimpleTreeCodeDao.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.persagy.fm.mybatis.dao.SimpleTreeCodeDao">
	<select id="getMaxCode" resultType="java.lang.String">
		select max(${innerCodeField}) as code
		from ${tableName}
		where ${innerCodeField} like '${parentCode}_____'
	</select>

	<select id="updateSubTreeCode">
		update ${tableName} set ${innerCodeField} = (concat('${parentCode}',substr(${innerCodeField},${oldParentCode.length()+1})))
		where ${innerCodeField} like '${oldParentCode}%'
	</select>
</mapper>