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需求：二维码能扫出，合同打印的次数，求记录打印次数方法，谢谢！
你可以在单据上添加字段来保存打印次数，然后生成的二维码是可以返回这个打印次数的链接。 不知道你这个需求的本意，查询打印次数主要为了什么呢?
