数据库批量写入判断问题
我所做的功能是一个订单导入的功能,就把xls里面的数据导入到mysql,每次1000条左右.
现在的问题是,每一条记录有个编码,我先要查一下这个编码系统中有没有建好,建好的,就导入,如果没有建好就这一整批都不导入系统,请问应该怎么做呢??
------解决方案--------------------
没看明白,每条记录一个编码,但是这个编码没有建好,怎么就一整批不能导入,不是这条不能导入吗?
如果是我想的那一条不能导入,可以这样做:
先把那1000条数据从XLS文件里读出,同时把编码表从数据库读出,以编码为主键建立一个数组,然后循环读取你那1000条数据,每次用这条数据的编码查找编码数组中是否存在,不存在则跳过,存在则保存入数据库。当然你可以编写SQL语句最后一次性保存。
------解决方案--------------------
纯粹是没事找事,自找麻烦!
实现起来很简单,对于每条内容
先检查编码是否存在(select)
根据结果再插入(insert)
显然你们的系统使用了外键(纯属自己给自己造麻烦)
其实直接插入也没有关系,反正不是出错就是插入无效

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