| Re: Clean PDO-MySQL Statement [message #177683 is a reply to message #177682] |
Fri, 13 April 2012 12:42   |
M. Strobel
Messages: 386
Registered: December 2011
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From: "M. Strobel" <sorry_no_mail_here(at)nowhere(dot)dee>
Newsgroups: comp.lang.php
Subject: Re: Clean PDO-MySQL Statement
Date: Fri, 13 Apr 2012 14:42:26 +0200
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Am 13.04.2012 13:30, schrieb Alexandra Herzog:
> Hi everyone,
>
> I am using the PDO with MySQL for the first time and created a statement. Besides from individual input validation (which I always do), I would like to know, if you consider the following to be a clean statement:
>
> That's what I figured from googled examples:
>
> include ("pdoconnect.php");
> $stmt = $dbh->prepare("SELECT firstname, name FROM telephonebook WHERE from_work = :workstatus ORDER BY :mywish ASC");
prepare will give you bool(false) if something is wrong. If you do not test for this
your $stmt->bindParam() can fail. Either always test it, wrap the call, or use
exception mode (see below).
> $stmt->bindParam(':workstatus', $n, PDO::PARAM_INT);
> $stmt->bindParam(':mywish', $value, PDO::PARAM_STR);
> $n = 1; $order = "firstname";
> $stmt->execute();
>
> echo "<u>".$stmt->rowCount()."</u>\r\n";
> while ($row = $stmt->fetch())
> echo $row['firstname']." ".$row['name']."<br>";
> $stmt->closeCursor();
> $dbh = null;
>
>
> in pdoconnect.php:
> -----------------------
> try
> { $dbh = new PDO('mysql:host=host1.myhost.com;dbname=mydb1', alex, mypass);
Those making use of the OO goodies would define their own wrapper class where they
put all the db helpers, like this:
class Dbman extends PDO {
function __construct($dburl) {
parent::__construct($dburl);
# $this->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
# $this->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION );
}
}
Errormode exception tells PDO to thow an exception on errors. This makes it easy to
frame your code with try - catch without testing every single database request.
A lot more can be said to this subject...
/Str.
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