mysql LOAD DATA INFILE更新 [英] mysql LOAD DATA INFILE update

问题描述

我当前正在使用mySQL LOAD DATA INFILE将csv文件插入到我的数据库中.每天将此csv文件下载到服务器，以保持产品数据为最新.

I am currently using mySQL LOAD DATA INFILE to insert a csv file into my database. This csv file is downloaded to the server on a daily basis in order to keep product data up-to-date.

我想知道的是如何使用新的csv更新表并在没有区别的地方保存现有数据?

What I want to know is how can I update the table with the new csv and preserve the existing data where it's not different?

这是我当前的声明:

LOAD DATA LOCAL INFILE '$file' REPLACE INTO TABLE products FIELDS TERMINATED BY ',' ENCLOSED BY '\"' ESCAPED BY '\\\' IGNORE 1 LINES (aw_product_id,merchant_id,merchant_image_url,aw_deep_link,description,in_stock,merchant_name,brand_name,display_price,product_name,rrp_price,merchant_category

这很好用，但是它用一个全新的集替换了ID列，并且还将我要忽略的列恢复为默认状态.例如，我有一个名为"Published"的列，其值为0或1.如果使用REPLACE，它将将该列设置回0.

This works fine but it replaces the ID column with a completely new set and also reverts columns that I want to ignore, back to the default state. For example I have a column called 'Published' with a value of 0 or 1. If I use REPLACE it sets that column back to 0.

如何使用REPLACE但忽略一些列?

How can I use REPLACE but ignore some columns?

推荐答案

如何使用REPLACE但忽略某些列?的答案是您不能: REPLACE始终替换完整的行，而不是该行的单个字段值.

The answer to How can I use REPLACE but ignore some columns? is you can't: REPLACE allways replaces a complete row, not the single field values of that row.

尽管是，我仍然可以实现我的目标的答案是:是:我的建议是将LOAD DATA LOCAL INFILE插入另一个表，然后使用存储过程或查询来INSERT和UPDATE(与REPLACE相对)主表.如果您向我们提供更多信息(表结构，哪一列将加载的数据与现有数据进行匹配)，我们也许可以为您提供进一步的帮助.

The answer to Can I still achieve my goal though is Yes: My recommendation would be to LOAD DATA LOCAL INFILE into another table, then use a stored procedure or query to INSERT and UPDATE (as opposed to REPLACE) your main table. If you give us a bit more information (table structure, which column matches the loaded data with the existing data) we might be able to help you further.

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