Question

我有一个wordpress插件，它本质上创建了一个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多个NOT LIKE的大型查询，从而导致查询速度非常慢。

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

客户在wordpress插件中添加了大量否定关键字，导致查询次数大于上述查询。

Answer 1

使用REGEXP最容易做到这一点。对于多个字词，请使用(one|two|three)

之类的组

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

Answer 2

您可以使用REGEXP操作一次比较所有模式。

您的查询将类似于：

SELECT field1,field2,field3,field4 
  FROM data table
 WHERE title NOT REGEXP '^word[0-9]?$'
   AND MATCH(title) ("\"brandname\" " IN BOOLEAN MODE)
 ORDER BY total ASC LIMIT 0,60

mysql多个或不喜欢

2 个答案: