问题描述
我有一个大型数据库，其中包含带有<a>标记的记录，我想删除它们.当然，有一种方法可以创建一个全选，使用strip_tags并更新数据库的PHP脚本，但这需要很长时间.那么如何通过简单(或复杂)的MySQL查询来做到这一点?
I have a large database which contains records that have <a> tags in them and I would like to remove them. Of course there is the method where I create a PHP script that selects all, uses strip_tags and updates the database, but this takes a long time. So how can I do this with a simple (or complicated) MySQL query?
推荐答案
我认为，仅在MySQL中，没有任何有效的方法可以做到这一点.
I don't believe there's any efficient way to do this in MySQL alone.
MySQL确实具有REPLACE()函数，但是它只能替换常量字符串，不能替换模式.您可能会编写一个MySQL存储函数来搜索和替换标签，但是那时候最好写一个PHP脚本来完成这项工作. 相当可能不快，但是编写起来可能会更快.
MySQL does have a REPLACE() function, but it can only replace constant strings, not patterns. You could possibly write a MySQL stored function to search for and replace tags, but at that point you're probably better off writing a PHP script to do the job. It might not be quite as fast, but it will probably be faster to write.
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