新手问题：PDO和MYSQL INSERT查询问题

Question

I'm attempting to be more secure and start using PDO and prepared statements. This had been recommended to me and I've read up on these two websites: http://net.tutsplus.com/tutorials/php/why-you-should-be-using-phps-pdo-for-database-access/ and http://webdevrefinery.com/forums/topic/1272-your-mysql-code-sucks

I've hit a brick wall and I can't understand why the following doesn't work. I am trying to insert a row (to log a 404 error). I have read up about named and unnamed placeholders and I think the named placeholder method will be easier to maintain. I've also tried using "try" and "catch" for the first time. All of this is completely new to me, so please be kind! I don't get any errors but the code doesn't update the database- I get zero rows returned.

Here is the code:

$referer = $_SERVER['HTTP_REFERER'];
$domainName = "http://domain.com";
$_dtNow = date("d-m-Y H:i:s");
$_referer = $domainName.$_SERVER['REQUEST_URI'];
$_thisPage = $domainName.$url;
$_ip = $_SERVER['REMOTE_ADDR'];
$_host = $_SERVER['REMOTE_HOST'];
if(isset($_SERVER['HTTP_USER_AGENT'])) {$_ua = $_SERVER['HTTP_USER_AGENT'];} else {$_ua = "unset";}

$host =     'localhost';
$port =     3306; // This is the default port for MySQL
$database = 'databaseName';
$username = 'username';
$password = 'password';
  // Construct the DSN, or "Data Source Name".  Really, it's just a fancy name
  // for a string that says what type of server we're connecting to, and how
  // to connect to it.  As long as the above is filled out, this line is all
  // you need :)
  $dsn = "mysql:host=$host;port=$port;dbname=$database";

try {
  // Connect!
  $db = new PDO($dsn, $username, $password);  
  $data = array( 
                'dateTime' =>   $_dtNow, 
                'referer' =>    $_referer, 
                'page' =>       $_thisPage,
                'ip' =>         $_ip,
                'host' =>       $_host,
                'ua' =>         $_ua
                );  
  $statement = $db->prepare("INSERT INTO 404s (dateTime, referer, page, ip, host, ua) value (:dateTime, :referer, :page, :ip, :host, :ua)");
  $statement->execute($data);
}
catch(PDOException $e) {  
    echo $e->getMessage();  
}  



?>

Answer 1

Are you sure of the table name is 404s it sound like an incorrect identifier.

 INSERT INTO 404s (dateTime, referer, page, ip, host, ua) value (:dateTime, :referer, :page, :ip, :host, :ua)

Try :

 INSERT INTO `404s` (dateTime, referer, page, ip, host, ua) value (:dateTime, :referer, :page, :ip, :host, :ua)

Use backquote around `404s`

Note Keep in mind that construct such as :

create table `404` ( `33` integer);

Are valid .

When you build complex request use of ` is very useful to avoid some kind of painful SQL errors especially when you format request from an introspection algorithm.

Like table, columns and database have to be protected.