<?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="cn.wise.sc.acquisition.business.mapper.TWeightMapper">
<!-- 根据条件求和某字段 --> <select id="getSumByCondition" resultType="Double"> SELECT sum(${condition}) FROM T_Weight a <where> ${ew.sqlSegment} </where> </select>
</mapper>