拼团3

MySQL

<update id="updateAddLockCount" parameterType="java.lang.String">
    <![CDATA[
        update group_buy_order
        set lock_count = lock_count + 1, update_time= now()
        where team_id = #{teamId} and lock_count < target_count
    ]]>
</update>

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责任链模型结构