mysql-为“ WHERE”条件设置多个值

Question

I have the following query:

  $select_query = "SELECT * FROM users WHERE userName='$user_name', password='$password'";

The problem is that the query always fail, so how can I fix the ' WHERE ' condition?

Answer 1

您需要使用AND

$select_query = "SELECT * FROM users WHERE userName='$user_name' AND password='$password'";

Answer 2

You'll need boolean logic for it:

$select_query = "SELECT * FROM users WHERE userName='$user_name' AND password='$password'";

Of course, this assumes you want the username and password to match. If you want either to match, you should use OR . This is all quite basic database stuff. Please read the documentation or get yourself a good book.

Answer 3

you need to use AND to separate your conditions.

where username ='$user_name' and password='$password'

Also, be aware that coding this way may make you vulnerable to SQL injection bugs/attacks.