Heim >Backend-Entwicklung >PHP-Tutorial >请指导,简单的数据库语句
请指点,简单的数据库语句
$query = "select orderid from orders where
customerid = $customerid and
amount > ".$_SESSION['total_price']."-.001 and //这句是什么意思? ."-.001 是什么意思?
amount date = '$date' and
order_status = 'PARTIAL' and
ship_name = '$ship_name' and
ship_address = '$ship_address' and
ship_city = '$ship_city' and
ship_state = '$ship_state' and
ship_zip = '$ship_zip' and
ship_country = '$ship_country'";
------解决方案--------------------
-0.001
+0.001
------解决方案--------------------
total_price 取值上下浮动 0.001饭碗内
例如
total_price = 1.001
取值 1.000 到 1.002
------解决方案--------------------
就是算术运算的-0.001 与 +0.001
例如$_SESSION['total_price'] 的值是 1
那么语句就相当于
$query = "select orderid from orders where
customerid = $customerid and
amount >0.999 and
amount
date = '$date' and
order_status = 'PARTIAL' and
ship_name = '$ship_name' and
ship_address = '$ship_address' and
ship_city = '$ship_city' and
ship_state = '$ship_state' and
ship_zip = '$ship_zip' and
ship_country = '$ship_country'";