php - 在同一查询中使用 AND & OR LIKE 时，Mysql 排除第一个参数？

Question

我试图执行这个非常简单的查询。

links_public 1 = 显示

links_public 0 = 不显示

但是，当运行下面的查询时，它仍会返回 links_public 设置为 0 的所有行。

 SELECT *
 FROM links
 WHERE links_public = '1'
 AND links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%'
 OR links_link LIKE '%$filter%'
 ORDER BY links_created DESC

Answer 1

尝试使用一些括号。

就像是

 SELECT *
 FROM links
 WHERE links_public = '1'
 AND (links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%'
 OR links_link LIKE '%$filter%')
 ORDER BY links_created DESC

你拥有它的方式，它被视为

SELECT *
 FROM links
 WHERE (links_public = '1'
 AND links_description LIKE '%$filter%')
 OR links_created_by LIKE '%$filter%'
 OR links_link LIKE '%$filter%'
 ORDER BY links_created DESC

看看12.3.1。运算符优先级

Answer 2

改变

SELECT *
 FROM links
 WHERE links_public = '1'
 AND links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%'
 OR links_link LIKE '%$filter%'
 ORDER BY links_created DESC

至

SELECT *
 FROM links
 WHERE links_public = '1'
 AND ( links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%' OR links_link LIKE '%$filter%' )
 ORDER BY links_created DESC

Answer 3

手术室正在制造问题。您需要使用 () 对条件进行分组。你应该使用： -

SELECT *
 FROM links
 WHERE links_public = '1'
 AND (links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%' OR links_link LIKE '%$filter%' )
 ORDER BY links_created DESC

Answer 4

放置括号，然后尝试：

SELECT *
 FROM links
 WHERE (links_public = '1')
 AND (links_description LIKE '%$filter%'
 OR links_created_by LIKE '%$filter%'
 OR links_link LIKE '%$filter%')
 ORDER BY links_created DESC