Question

我希望创建一个简单的查询，显示类别ID与数据库中的“category”或“category_2”列匹配的所有产品，同时匹配品牌。

我需要在同一个查询中使用OR和AND。

这是我当前的查询工作正常：

$all="SELECT * FROM models WHERE category = " . $category['id'] . " AND brand = ". $brand_name['id'] ." ORDER BY year DESC, month DESC";

这是我想要实现的目标：

$all="SELECT * FROM models WHERE category = " . $category['id'] . " OR category_2 = " . $category['id'] . " AND brand = ". $brand_name['id'] ." ORDER BY year DESC, month DESC";

然而，根据我的新查询，AND品牌部分无效。

Answer 1

这很容易sql注入你应该使用mysqli。试试这个：

true

Answer 2

您需要对逻辑进行分组：

$all="SELECT * FROM models 
WHERE (category = " . $category['id'] . " OR category_2 = " . $category['id'] . ")
AND brand = ". $brand_name['id'] ." ORDER BY year DESC, month DESC";

Answer 3

尝试添加()

$all="SELECT * 
FROM models 
WHERE (category = " . $category['id'] . " OR category_2 = " . $category['id'] . ")
AND brand = ". $brand_name['id'] ." 
ORDER BY year DESC, month DESC";

Answer 4

您需要做的就是在OR条件周围放置括号。

$all="SELECT * FROM models WHERE (category = " . $category['id'] . " OR category_2 = " . $category['id'] . ") AND brand = ". $brand_name['id'] ." ORDER BY year DESC, month DESC";

Answer 5

只需将.WithMany(e => e.Locations)条件放在or内，这样就可以将它们视为一个条件，然后将brackets视为第二个条件

AND

在同一查询中使用OR和AND查询问题

5 个答案: