fans/hx-sale/src/main/resources/mapper/contract/ContractProductBomMapper.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.fjhx.sale.mapper.contract.ContractProductBomMapper">
    <select id="getContractProductBomQuantitySum" resultType="com.fjhx.sale.entity.contract.po.ContractProductBom">
        SELECT sum(cpb.quantity * cp.quantity) AS quantity,
               cpb.*
        FROM contract_product_bom cpb
                 LEFT JOIN contract_product cp ON cpb.contract_product_id = cp.id
        WHERE cpb.contract_id = #{contractId}
        GROUP BY contract_id,
                 material_id
    </select>
</mapper>