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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