Call to a member function bind_param() on a non-object

Well, one reason prepare() can fail is if the sql statement sent to it is not valid in the current DB.

prepare() will then return false.

Eg - if the table name is not correct or one or more field in the query does not exist.

as the error-message says, $qSelect seems to be not an object. try to debug this by using var_dump($qSelect); right after your prepare-call. also check if getDBH() returns what you need.

sounds like the prepare-call fails (don't know why) and so it returns false - false is not an object, so you can't call bind_param() on that.

EDIT: you havn't given the info, but it looks like you're using PHP's PDO. In that case, take a look at the documentation.

If the database server successfully prepares the statement, PDO::prepare() returns a PDOStatement object. If the database server cannot successfully prepare the statement, PDO::prepare() returns FALSE or emits PDOException (depending on error handling).

You should configure your server to return those PDO-Exceptions, which would tell you why the prepare call fails.

i'm using the mysqli approach as well and got the same error when I created another instance of mysqli before closing the first instance. So its important to use close() before starting the same piece of code. For example:

$DBH = getDBH();
$qSelect = $DBH->prepare("SELECT * FROM users WHERE username = ?");
$qSelect->bind_param("s", $username);
$qSelect->close();  // <--- use close before calling the same function( wich contains $DBH code) again;