PHP PDO, Object, bindParam - php

Question

I don't manage to fill a table with a PHP Object with PDO and an object created from a JSON file. Do you see where the error comes from?
I use PHP5 & PostgreSQL
The code I wrote sucessfully adds the lines, but only the first column (field) of each row is filled, the others remain white.
My table structure looks like this:
CREATE TABLE ' . $infoTableName . ' (field text,type text,expefactor boolean,iduser boolean,idcontext boolean,idaction boolean,params boolean,comment text)
My object looks like this:
object(stdClass)[3]
public 'timestamp' =>
object(stdClass)[4]
public 'idagent' => boolean false
public 'idcontext' => boolean false
public 'idaction' => boolean false
public 'comment' => string 'ffff' (length=4)
public 'order' =>
object(stdClass)[5]
public 'idagent' => boolean false
public 'idcontext' => boolean false
public 'idaction' => boolean false
public 'comment' => string 'none' (length=4)
public 'test' =>
object(stdClass)[6]
public 'idagent' => boolean false
public 'idcontext' => boolean true
public 'idaction' => boolean false
public 'comment' => string 'y' (length=1)
And finally the PHP code:
$structure = json_decode($_POST['structure']);
$query = "INSERT INTO " . $infoTableName . " (field, iduser, idcontext, idaction, comment) VALUES (:field, :idagent, :idcontext, :idaction, :comment)"; //Prequery
$stmt = $db->prepare($query);
$stmt->bindParam(':field', $key);
$stmt->bindParam(':idagent', $value->idagent);
$stmt->bindParam(':idcontext', $value->idcontext);
$stmt->bindParam(':idaction', $value->idaction);
$stmt->bindParam(':comment', $value->comment);
foreach ($structure as $key => &$value) {
try {
var_dump($stmt->execute());
} catch (PDOException $e) {
var_dump($e->getMessage());
}
}
Do you see the error?
Thanks a lot.
EDIT: It looks like I am asking a too much with object in binding functions, still, here is a little workaround:
$stmt->bindParam(':field', $key);
$stmt->bindParam(':idagent', $idagent);
$stmt->bindParam(':idcontext', $idcontext);
$stmt->bindParam(':idaction', $idaction);
$stmt->bindParam(':comment', $comment);
foreach ($structure as $key => &$value) {
$idagent = $value->idagent;
$idcontext = $value->idcontext;
$idaction = $value->idaction;
$comment = $value->comment;
try {
var_dump($stmt->execute());
} catch (PDOException $e) {
var_dump($e->getMessage());
}
}
The reason bindParam() doesn't work is when I iterate thru the $structure, $value is reinstanciated, resulting in the references being changed... I first thought &$value would help, but it looks like not.

Answer 1

Like they do here: ...
No, they do not. Look again:
$stmt->bindParam(':name', $name);
$name = 'one';
$stmt->execute();
They are binding the variable $name by reference and then assign a value to $name.
You on the other hand are doing:
$stmt->bindParam(':idagent', $value->idagent);
foreach ($structure as $key => &$value) {
$stmt->execute();
}
You are binding $value->idagent by reference (I'm not actually sure if that works, creating an implicit object...?!), and then you're reference-overwriting $value. If at all, you should be assigning a value to $value->idagent, which was bound. Just replacing the $value object is not the same thing at all. PHP isn't so intelligent that it tracks that you bound the idagent attribute of that object and will reconstruct that after you have switched the underlying object. That's a little too meta.
I think in this case it's most useful to use bindValue inside your foreach loop and bind the existing values there.
$stmt = $db->prepare($query);
foreach ($structure as $key => $value) {
$stmt->bindValue(':field', $key);
$stmt->bindValue(':idagent', $value->idagent);
$stmt->bindValue(':idcontext', $value->idcontext);
$stmt->bindValue(':idaction', $value->idaction);
$stmt->bindValue(':comment', $value->comment);
$stmt->execute()
}

Answer 2

It looks like I am asking a too much with object in binding functions, still, here is a little workaround:
$stmt->bindParam(':field', $key);
$stmt->bindParam(':idagent', $idagent);
$stmt->bindParam(':idcontext', $idcontext);
$stmt->bindParam(':idaction', $idaction);
$stmt->bindParam(':comment', $comment);
foreach ($structure as $key => &$value) {
$idagent = $value->idagent;
$idcontext = $value->idcontext;
$idaction = $value->idaction;
$comment = $value->comment;
try {
var_dump($stmt->execute());
} catch (PDOException $e) {
var_dump($e->getMessage());
}
}
The reason bindParam() doesn't work is when I iterate thru the $structure, $value is reinstanciated, resulting in the references being changed... I first thought &$value would help, but it looks like not.