Catchable fatal error: Object of class stdClass could not be converted to string in <filename>

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Catchable fatal error: Object of class stdClass could not be converted
to string in on line

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****

**************************************************

I can only find the change log for PHP 5.2 identifying this type of
error, nothing on how to fix it. I have updated PHP to 5.2.3 on Apache
2.2.x on a BSD Box 6.x If some one could explain to me what I am doing
wrong, and what I need to do to fix it that would be swell.

A point of note is that my $dbh is being created in my class constructor
as a private. The method that is calling the prepare and execute
statements is a public. I don't thing I'm trying to do anything new or
exotic, I don't think I'm trying to convert the object to a string, just
execute the query statement....

$begin =3D $this->dbh->beginTransaction();

if (!$begin) throw new HWIException(ERR0023,23);

$outdc =3D "";

$outliid =3D "";

$prep_users =3D $this->dbh->prepare($sql_users);

if (!$prep_users) {

$msg =3D $this->dbh->errorInfo();

throw new HWIException(ERR0021 . " " .

$msg[2], 21);

}

$prep_users->bindParam(':username',

$this->userObj->hwi_username,

PDO::PARAM_STR, 16);

$prep_users->bindParam(':title',
$this->userObj->hwi_title, PDO::PARAM_STR, 4);

$prep_users->bindParam(':firstname',

$this->userObj->hwi_firstname,

PDO::PARAM_STR, 30);

$prep_users->bindParam(':midinit',

$this->userObj->hwi_midinit,

PDO::PARAM_STR, 1);

$prep_users->bindParam(':lastname',

$this->userObj->hwi_lastname,

PDO::PARAM_STR, 45);

$prep_users->bindParam(':priphone',

$this->userObj->hwi_priphone,

PDO::PARAM_STR, 30);

$prep_users->bindParam(':priext',
$this->userObj->hwi_priext, PDO::PARAM_STR, 10);

$prep_users->bindParam(':secphone',

$this->userObj->hwi_secphone,

PDO::PARAM_STR, 30);

$prep_users->bindParam(':secext',
$this->userObj->hwi_secext, PDO::PARAM_STR, 10);

$prep_users->bindParam(':fax',
$this->userObj->hwi_fax, PDO::PARAM_STR, 30);

$prep_users->bindParam(':isPI',
$this->userObj->hwi_ispi, PDO::PARAM_INT);

$prep_users->bindParam(':date_returned', $outdc,
PDO::PARAM_STR);

$prep_users->bindParam(':liid', $outliid,
PDO::PARAM_STR);

##################### PROBLEM LINE OF CODE ###################

$exec =3D $prep_users->execute();
############################################################ #####

if(!$exec) {

$msg =3D $prep_users->errorInfo();

throw new HWIException(ERR0022 . " " .

$msg[2], 22);

}


Max H. Thayer
Software Developer
Center for High-Throughput Structural Biology
=20
Hauptman-Woodward Medical Research Inst.
700 Ellicott St.
Buffalo, NY 14203
Phone: 716-898-8637
Fax: 716-898-8660
http://www.chtsb.org =20
http://www.hwi.buffalo.edu =20


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RE: Catchable fatal error: Object of class stdClass could not be converted to string in <filenam

Edit: I've added usage example and a clearer explanation of the code
snippet.

Catchable fatal error: Object of class stdClass could not be converted
to string in on line

************************************************************ *****

I can only find the change log for PHP 5.2 identifying this type of
error, nothing on how to fix it. I have updated PHP to 5.2.3 on Apache
2.2.x on a BSD Box 6.x If some one could explain to me what I am doing
wrong, and what I need to do to fix it that would be swell.

A point of note is that my $dbh is being created in my class constructor
as a private. The method that is calling the prepare and execute
statements is a public. I don't thing I'm trying to do anything new or
exotic, I don't think I'm trying to convert the object to a string, just
execute the query statement....

//code snip of public function insertUser()
$begin =3D $this->dbh->beginTransaction();

if (!$begin) throw new HWIException(ERR0023,23);

$outdc =3D "";

$outliid =3D "";

$prep_users =3D $this->dbh->prepare($sql_users);
if (!$prep_users) {
$msg =3D $this->dbh->errorInfo();
throw new HWIException(ERR0021 . " " . $msg[2], 21);
}
$prep_users->bindParam(':username', $this->userObj->hwi_username,
PDO::PARAM_STR, 16);

$prep_users->bindParam(':title', $this->userObj->hwi_title,
PDO::PARAM_STR, 4);

$prep_users->bindParam(':firstname', $this->userObj->hwi_firstname,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':midinit', $this->userObj->hwi_midinit,
PDO::PARAM_STR, 1);

$prep_users->bindParam(':lastname', $this->userObj->hwi_lastname,
PDO::PARAM_STR, 45);

$prep_users->bindParam(':priphone', $this->userObj->hwi_priphone,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':priext', $this->userObj->hwi_priext,
PDO::PARAM_STR, 10);

$prep_users->bindParam(':secphone', $this->userObj->hwi_secphone,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':secext', $this->userObj->hwi_secext,
PDO::PARAM_STR, 10);

$prep_users->bindParam(':fax', $this->userObj->hwi_fax, PDO::PARAM_STR,
30);

$prep_users->bindParam(':isPI', $this->userObj->hwi_ispi,
PDO::PARAM_INT);

$prep_users->bindParam(':date_returned', $outdc, PDO::PARAM_STR);

$prep_users->bindParam(':liid', $outliid, PDO::PARAM_STR);

##################### PROBLEM LINE OF CODE ###################
$exec =3D $prep_users->execute();
############################################################ #####

if(!$exec) {
$msg =3D $prep_users->errorInfo();
throw new HWIException(ERR0022 . " " . $msg[2], 22);
}

************************************************************ ****
USAGE
test.php
************************************************************ ****
$userobject->username =3D 'mysuername';
$userobject->lastname =3D 'mylastname';
// continue on w/ each property as described in the bindParam statements
in the insertUser() method.

//class MyUser extends PDO (I started out extending PDO, changed to code
to debug it by creating a $dbh object in the constructor, and switched
back to extending PDO. Nothing works.

$userObj =3D new MyUser($userObject);
$userObj->insertUser();

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Re: Catchable fatal error: Object of class stdClass could not be converted to string in <filenam

Hi
Seeing as no-one else has replied to this, I'll make a comment. First
off let me state I don't use PDO so I am not familiar with it.

It would appear to me that your "problem" line is NOT the problem. It is
only where the error is reported from. That line is a call to an object
method, so the problem is in that method. As you haven't supplied the
code for that method, no one is able to help.

> A point of note is that my $dbh is being created in my class constructor
> as a private. The method that is calling the prepare and execute
> statements is a public. I don't thing I'm trying to do anything new or
> exotic, I don't think I'm trying to convert the object to a string, just
> execute the query statement....

Probably not relevant, although it likely would be better to assign by
reference.

$prep_users =& $this->dbh->prepare($sql_users);

The main problem is we don't know what your $dbh is. We can guess it's a
database handle, but that really doesn't tell us anything useful, like
how it is constructed, and what the method you try calling is trying to
do

We need to see the code for the method:

$prep_users->execute();

as that is where the error is occurring, and possibly the constructor and
prepare methods also.


Niel

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RE: Catchable fatal error: Object of class stdClass could not be converted to string in <filenam

Thank you for responding to my requests for assistance.

Actually, the $dbh is the db handler object as stated in other PHP/PDO
examples $this->dbh =3D new PDO(...), that wasn't the area of issue,
however "the problem NOT being the problem..." was correct.

The issue with the code was subsequently one of the last bindParam()
calls. The error message, "Catchable Fatal Error: Object of class
stdClass could not be converted to string in on line ." was
behaving exactly as it should. =20

The variable $this->userObj->hwi_ispi sent to the bindParam() was in
fact an object not a string. The change in PHP 5.2 which prevents magic
conversion of object to string puked at me with the error message
mentioned on the line in which PDO was actually taking my bound
variables and attempting to execute the statement.
PDOStatement::execute() failed when it could not magically convert the
object to string (or insert an object when it expected a string or
integer?) This is where references to "__toStrint()" comes into play.
Without testing this, my assumption is that an earlier version of PHP
would have converted the object to string, and the string to an integer
representation, completing the code execution but inserting invalid data
to my database?

If it even got that far, would PDO have puked because the bindParam()
for $hwi_ispi was typed as PDO::PARAM_INT?

My next question now lies herein with PDOStatement::bindParam()...how do
we get PDO to respond a little smarter on a bindParam() failure?

Apparently each PDOStatement::bindParam() needs an error check on it?

if(!PDOStatement::bindParam()) throw new MyException("bindparam failed",
9999); (this doesn't seam to fail if the data-type isn't what was
expected, based on PDO::PARAM_xxx)

So it looks like it is my responsibility to verify the variable is what
I said it is, before I do my PDOStatement::bindParam() on it.

I have since "fixed" my code to do a data-type check on the variable
being bound, and low and behold it works now.

I realize that many of these questions are rhetorical, and many do not
NEED to be answered. However, if I have misrepresented something or if
I am completely off base with my understanding of PDO please comment.
My goal here is to provide more documentation for the "Catchable Fatal
Error:" for which I have fought so hard to resolve.

Max H. Thayer
Software Developer
Center for High-Throughput Structural Biology
=20
Hauptman-Woodward Medical Research Inst.
700 Ellicott St.
Buffalo, NY 14203
Phone: 716-898-8637
Fax: 716-898-8660
http://www.chtsb.org
http://www.hwi.buffalo.edu

-----Original Message-----
From: Niel Archer [mailto:Niel Archer] On Behalf Of Niel Archer
Sent: Monday, June 25, 2007 11:40 AM
To: php-db@lists.php.net
Subject: Re: [PHP-DB] Catchable fatal error: Object of class stdClass
could not be converted to string in on line

Hi=20
Seeing as no-one else has replied to this, I'll make a comment. First
off let me state I don't use PDO so I am not familiar with it.

It would appear to me that your "problem" line is NOT the problem. It is
only where the error is reported from. That line is a call to an object
method, so the problem is in that method. As you haven't supplied the
code for that method, no one is able to help.

> A point of note is that my $dbh is being created in my class
constructor
> as a private. The method that is calling the prepare and execute
> statements is a public. I don't thing I'm trying to do anything new or
> exotic, I don't think I'm trying to convert the object to a string,
just
> execute the query statement....

Probably not relevant, although it likely would be better to assign by
reference.

$prep_users =3D& $this->dbh->prepare($sql_users);

The main problem is we don't know what your $dbh is. We can guess it's a
database handle, but that really doesn't tell us anything useful, like
how it is constructed, and what the method you try calling is trying to
do

We need to see the code for the method:

$prep_users->execute();

as that is where the error is occurring, and possibly the constructor
and
prepare methods also.


Niel

--=20
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php

################### ORIGINAL MESSAGE #################

//code snip of public function insertUser() $begin =3D
$this->dbh->beginTransaction();

if (!$begin) throw new HWIException(ERR0023,23);

$outdc =3D "";

$outliid =3D "";

$prep_users =3D $this->dbh->prepare($sql_users); if (!$prep_users) { =
$msg
=3D $this->dbh->errorInfo(); throw new HWIException(ERR0021 . " " .
$msg[2], 21); } $prep_users->bindParam(':username',
$this->userObj->hwi_username, PDO::PARAM_STR, 16);

$prep_users->bindParam(':title', $this->userObj->hwi_title,
PDO::PARAM_STR, 4);

$prep_users->bindParam(':firstname', $this->userObj->hwi_firstname,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':midinit', $this->userObj->hwi_midinit,
PDO::PARAM_STR, 1);

$prep_users->bindParam(':lastname', $this->userObj->hwi_lastname,
PDO::PARAM_STR, 45);

$prep_users->bindParam(':priphone', $this->userObj->hwi_priphone,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':priext', $this->userObj->hwi_priext,
PDO::PARAM_STR, 10);

$prep_users->bindParam(':secphone', $this->userObj->hwi_secphone,
PDO::PARAM_STR, 30);

$prep_users->bindParam(':secext', $this->userObj->hwi_secext,
PDO::PARAM_STR, 10);

$prep_users->bindParam(':fax', $this->userObj->hwi_fax, PDO::PARAM_STR,
30);

$prep_users->bindParam(':isPI', $this->userObj->hwi_ispi,
PDO::PARAM_INT);

$prep_users->bindParam(':date_returned', $outdc, PDO::PARAM_STR);

$prep_users->bindParam(':liid', $outliid, PDO::PARAM_STR);

##################### PROBLEM LINE OF CODE ################### $exec =3D
$prep_users->execute();
############################################################ #####

if(!$exec) {
$msg =3D $prep_users->errorInfo();
throw new HWIException(ERR0022 . " " . $msg[2], 22); }

************************************************************ **** USAGE
test.php
************************************************************ ****
$userobject->username =3D 'mysuername'; $userobject->lastname =3D
'mylastname'; // continue on w/ each property as described in the
bindParam statements in the insertUser() method.

//class MyUser extends PDO (I started out extending PDO, changed to code
to debug it by creating a $dbh object in the constructor, and switched
back to extending PDO. Nothing works.

$userObj =3D new MyUser($userObject);
$userObj->insertUser();

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