mysql 多个或不喜欢

Question

我有一个 wordpress 插件，它实际上创建了一个 mysql 查询并将结果返回给 wordpress。

它是用户驱动的，因此最终可能会出现包含多个 NOT LIKE 的大型查询，这会导致查询非常缓慢。

我可以用来改进的任何建议:

SELECT field1,field2,field3,field4 
from datatable 
WHERE (title NOT LIKE '%word%' AND title NOT LIKE '%word2%'
AND title NOT LIKE '%word3%' AND title NOT LIKE '%word4%' 
AND title NOT LIKE '%word5%' AND title NOT LIKE '%word6%' 
AND title NOT LIKE '%word7%' AND title NOT LIKE '%word8%' 
AND title NOT LIKE '%word9%') 
AND MATCH (title) AGAINST ("\"brandname\" " IN BOOLEAN MODE) 
ORDER BY total ASC LIMIT 0,60

客户正在向 wordpress 插件添加大量否定关键字，这导致查询比上面的查询更大。

Answer 1

使用 REGEXP 最容易做到这一点.对于多个单词，使用像 (one|two|three)

这样的组

SELECT 
  field1,
  field2,
  field3,
  field4
from datatable
WHERE 
  title NOT REGEXP '(word1|word2|word3|word4|word5...|word9)'
  AND MATCH (title) AGAINST ("\"brandname\" " IN BOOLEAN MODE)
ORDER BY total ASC
LIMIT 0,60