Question

我的mysql过滤器有问题。如果用户有空字段，则查询不起作用。我该如何解决这个问题，我尝试过发送＆＃39; NULL＆＃39;在类型中如果未选择类型，但这也不起作用。

$STH = $DBH->query("
SELECT * 
WHERE store ='$type' and sdn='$status' and price>='$price_s' and price<='$price_e' ORDER BY id DESC LIMIT $setlimit");


$STH = $DBH->query("
SELECT * 
WHERE store ='$type' and sdn='$status' and price>='$price_s' and price<='$price_e' ORDER BY id DESC LIMIT $setlimit");

Answer 1

似乎缺少来自，例如如果表是销售，请尝试

$STH = $DBH->query("
SELECT * from sales 
WHERE store='$type' and sdn='$status' and price>='$price_s' and price<='$price_e' 
ORDER BY id DESC LIMIT $setlimit");


$STH = $DBH->query("
SELECT * from sales
WHERE store='$type' and sdn='$status' and price>='$price_s' and price<='$price_e' 
ORDER BY id DESC LIMIT $setlimit");

Answer 2

您错过了FROM your_table指令

$STH = $DBH->query("
SELECT *

FROM table

WHERE store ='$type' and sdn='$status' and price>='$price_s' and price<='$price_e' ORDER BY id DESC LIMIT $setlimit");

只需输入表格的名称即可（如果字段存在）

MySQL过滤器，WHERE

2 个答案: