unable to update value in mysql database using php

Question

I am not able to update MySQL table using PHP. How can I do that?

I have tried by changing the order of double quotes.

$name=mysql_real_escape_string($_POST["steel"]);
$db->execute("UPDATE order SET need=$name WHERE raw-id='1'");

It should store $name in the database.

Answer 1

您应将$ name用单引号引起来，因为您正在尝试将字符串传递到SQL中

$db->execute("UPDATE order SET need='$name' WHERE `raw-id`='1'");

Answer 2

您需要将列名包装在反引号中，因为其中包含破折号，例如：

$db->execute("UPDATE order SET need = '$name' WHERE `raw-id` = 1");

Answer 3

By referring to the manual I think you should first prepare your query and then use execute() method. Something like this:

$query = "INSERT INTO myCity (Name, CountryCode, District) VALUES (?,?,?)";
$stmt = $mysqli->prepare($query);
$stmt->execute();

Answer 4

您应该用单引号和括号将{$name}括起来，因为需要行是SQL中的字符串

$db->execute("UPDATE order SET need='{$name}' WHERE `raw-id`='1'");