<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
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<mapper namespace="com.mzl.flower.mapper.payment.CartMapper">
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<select id="getCartFlowerCount" resultType="java.lang.Integer">
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select sum(num) num
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from t_cart
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where create_by = #{userId}
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<if test="flowerId != null">
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AND flower_id = #{flowerId}
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</if>
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</select>
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</mapper>
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