PHP Data Objects

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User Contributed Notes 15 notes

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133
djlopez at gmx dot de
16 years ago
Please note this:

Won't work:
$sth = $dbh->prepare('SELECT name, colour, calories FROM ?  WHERE calories < ?');

THIS WORKS!
$sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < ?');

The parameter cannot be applied on table names!!
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13
wiserufferto at gmail dot com
1 year ago
This is a little late... but I'm old and slow.......
Regarding Extending PDOStatement and PDO I found that sending the PDOExtended class by reference helps:
    In the constructor after parent::__construct() :
$this->setAttribute(\PDO::ATTR_STATEMENT_CLASS,array('PDOStatementExtended', [&$this]));}

And in
class PDOStatementExtended extends \PDOStatement
{
 
  protected function __construct
  (
    \PDO &$PDO,
   )
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10
pokojny at radlight dot com
16 years ago
I wanted to extend PDO class to store statistics of DB usage, and I faced some problems. I wanted to count number of created statements and number of their executings. So PDOStatement should have link to PDO that created it and stores the statistical info. The problem was that I didn't knew how PDO creates PDOStatement (constructor parameters and so on), so I have created these two classes:

<?php
/**
* PHP Document Object plus
*
* PHP Document Object plus is library with functionality of PDO, entirely written
* in PHP, so that developer can easily extend it's classes with specific functionality,
* such as providing database usage statistics implemented in v1.0b
*
* @author Peter Pokojny
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*/
   
class PDOp {
        protected
$PDO;
        public
$numExecutes;
        public
$numStatements;
        public function
__construct($dsn, $user=NULL, $pass=NULL, $driver_options=NULL) {
           
$this->PDO = new PDO($dsn, $user, $pass, $driver_options);
           
$this->numExecutes = 0;
           
$this->numStatements = 0;
        }
        public function
__call($func, $args) {
            return
call_user_func_array(array(&$this->PDO, $func), $args);
        }
        public function
prepare() {
           
$this->numStatements++;
           
           
$args = func_get_args();
           
$PDOS = call_user_func_array(array(&$this->PDO, 'prepare'), $args);
           
            return new
PDOpStatement($this, $PDOS);
        }
        public function
query() {
           
$this->numExecutes++;
           
$this->numStatements++;
           
           
$args = func_get_args();
           
$PDOS = call_user_func_array(array(&$this->PDO, 'query'), $args);
           
            return new
PDOpStatement($this, $PDOS);
        }
        public function
exec() {
           
$this->numExecutes++;
           
           
$args = func_get_args();
            return
call_user_func_array(array(&$this->PDO, 'exec'), $args);
        }
    }
    class
PDOpStatement implements IteratorAggregate {
        protected
$PDOS;
        protected
$PDOp;
        public function
__construct($PDOp, $PDOS) {
           
$this->PDOp = $PDOp;
           
$this->PDOS = $PDOS;
        }
        public function
__call($func, $args) {
            return
call_user_func_array(array(&$this->PDOS, $func), $args);
        }
        public function
bindColumn($column, &$param, $type=NULL) {
            if (
$type === NULL)
               
$this->PDOS->bindColumn($column, $param);
            else
               
$this->PDOS->bindColumn($column, $param, $type);
        }
        public function
bindParam($column, &$param, $type=NULL) {
            if (
$type === NULL)
               
$this->PDOS->bindParam($column, $param);
            else
               
$this->PDOS->bindParam($column, $param, $type);
        }
        public function
execute() {
           
$this->PDOp->numExecutes++;
           
$args = func_get_args();
            return
call_user_func_array(array(&$this->PDOS, 'execute'), $args);
        }
        public function
__get($property) {
            return
$this->PDOS->$property;
        }
        public function
getIterator() {
            return
$this->PDOS;
        }
   }
?>

Classes have properties with original PDO and PDOStatement objects, which are providing the functionality to PDOp and PDOpStatement.
From outside, PDOp and PDOpStatement look like PDO and PDOStatement, but also are providing wanted info.
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-1
bart at mediawave dot nl
15 years ago
It seems MySQL doesn't support scrollable cursors. So unfortunately PDO::CURSOR_SCROLL wont work.
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-6
lkmorlan at uwaterloo dot ca
11 years ago
You may also have to edit /etc/freetds.conf. Make sure the TDS version is recent, e.g., "tds version = 8.0".
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-11
matthew at button-mashers dot net
8 years ago
When using prepared statements there is no official PDO feature to show you the final query string that is submitted to a database complete with the parameters you passed.

Use this simple function for debugging. The values you are passing may not be what you expect.

<?php
//Sample query string
$query = "UPDATE users SET name = :user_name WHERE id = :user_id";

//Sample parameters
$params = [':user_name' => 'foobear', ':user_id' => 1001];

function
build_pdo_query($string, $array) {
   
//Get the key lengths for each of the array elements.
   
$keys = array_map('strlen', array_keys($array));

   
//Sort the array by string length so the longest strings are replaced first.
   
array_multisort($keys, SORT_DESC, $array);

    foreach(
$array as $k => $v) {
       
//Quote non-numeric values.
       
$replacement = is_numeric($v) ? $v : "'{$v}'";

       
//Replace the needle.
       
$string = str_replace($k, $replacement, $string);
    }

    return
$string;
}

echo
build_pdo_query($query, $params);    //UPDATE users SET name = 'foobear' WHERE id = 1001
?>
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-9
paulius_k at yahoo dot com
16 years ago
If you need to get Output variable from MSSQL stored procedure, try this :

-- PROCEDURE
CREATE PROCEDURE spReturn_Int @err int OUTPUT
AS
SET @err = 11
GO

$sth = $dbh->prepare("EXECUTE spReturn_Int ?");
$sth->bindParam(1, $return_value, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT);
$sth->execute();
print "procedure returned $return_value\n";
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-6
neonmandk at gmail dot com
14 years ago
If you will make a OBJ row from PDO you can use this eg.

$resKampange = $dbc->prepare( "SELECT * FROM Table LIMIT 1" );
$resKampange->execute();
$rowKampange = $resKampange->fetch( PDO::FETCH_OB );

echo $rowKampange->felt1;

Good lock :0)
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-7
www.navin.biz
16 years ago
Below is an example of extending PDO & PDOStatement classes:

<?php

class Database extends PDO
{
    function
__construct()
    {
       
parent::__construct('mysql:dbname=test;host=localhost', 'root', '');
       
$this->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('DBStatement', array($this)));
    }
}

class
DBStatement extends PDOStatement
{
    public
$dbh;

    protected function
__construct($dbh)
    {
       
$this->dbh = $dbh;
       
$this->setFetchMode(PDO::FETCH_OBJ);
    }
   
    public function
foundRows()
    {
       
$rows = $this->dbh->prepare('SELECT found_rows() AS rows', array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE));
       
$rows->execute();
       
$rowsCount = $rows->fetch(PDO::FETCH_OBJ)->rows;
       
$rows->closeCursor();
        return
$rowsCount;
    }
}

?>
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-11
Sbastien Gourmand
9 years ago
Merge the prepare() and execute() in one function like a sprintf().
And like sprintf, I choose to use unnamed args (?) ;)

you could still use old insecure query() ( not prepared ) with renamed function :)

<?php
class MyPDO extends PDO{

    const
PARAM_host='localhost';
    const
PARAM_port='3306';
    const
PARAM_db_name='test';
    const
PARAM_user='root';
    const
PARAM_db_pass='';

    public function
__construct($options=null){
       
parent::__construct('mysql:host='.MyPDO::PARAM_host.';port='.MyPDO::PARAM_port.';dbname='.MyPDO::PARAM_db_name,
MyPDO::PARAM_user,
MyPDO::PARAM_db_pass,$options);
    }

    public function
query($query){ //secured query with prepare and execute
       
$args = func_get_args();
       
array_shift($args); //first element is not an argument but the query itself, should removed

       
$reponse = parent::prepare($query);
       
$reponse->execute($args);
        return
$reponse;

    }

    public function
insecureQuery($query){ //you can use the old query at your risk ;) and should use secure quote() function with it
       
return parent::query($query);
    }

}

$db = new MyPDO();
$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);

$t1 = isset($_GET["t1"])?$_GET["t1"]:1; // need to be securised for injonction
$t2 = isset($_GET["t2"])?$_GET["t2"]:2; // need to be securised for injonction
$t3 = isset($_GET["t3"])?$_GET["t3"]:3; // need to be securised for injonction

$ret = $db->query("SELECT * FROM table_test WHERE t1=? AND t2=? AND t3=?",$t1,$t2,$t3);
//$ret = $db->insecureQuery("SELECT * FROM table_test WHERE t1=".$db->quote($t1));

while ($o = $ret->fetch())
{
    echo
$o->nom.PHP_EOL;
}
?>
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anton dot clarke at sonikmedia dot com
15 years ago
Not all PDO drivers return a LOB as a file stream; mysql 5 is one example. Therefore when streaming a mime typed object from the database you cannot use fpassthru.

The following is a modified example that works with a mysql database. (Tested FreeBSD v 6.2 with mysql 5.0.45 and php 5.2.3)

<?php
ob_start
();
$db = new PDO('mysql:host=localhost;dbname=<SOMEDB>', '<USERNAME>', 'PASSWORD');
$stmt = $db->prepare("select contenttype, imagedata from images where id=?");
$stmt->execute(array($_GET['id']));
$stmt->bindColumn(1, $type, PDO::PARAM_STR, 256);
$stmt->bindColumn(2, $lob, PDO::PARAM_LOB);
$stmt->fetch(PDO::FETCH_BOUND);
ob_clean();
header("Content-Type: $type");
echo
$lob; // fpassthru reports an error that $lob is not a stream so echo is used in place.
ob_end_flush();
?>

Please note the inclusion of buffer control. I only needed this when using 'include','include_once','require', or 'require_once' - my feeling is there is a subtle issue with those options as even an empty include file caused a buffer issue for me. === AND YES, I DID CHECK MY INCLUDE FILES DID NOT HAVE SPURIOUS WHITESPACE ETC OUTSIDE THE <?php ?> DELIMITERS! ===
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-11
webform at aouie dot website
16 years ago
If you use $dbh = new PDO('pgsql:host=localhost;dbname=test_basic01', $user, $pass); and you get the following error:
PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[08006] [7] could not connect to server: Connection refused\n\tIs the server running on host "localhost" and accepting\n\tTCP/IP connections on port 5432?'
then as pointed out under pg_connect at: http://www.php.net/manual/en/function.pg-connect.php#38291
******
you should try to leave the host= and port= parts out of the connection string. This sounds strange, but this is an "option" of Postgre. If you have not activated the TCP/IP port in postgresql.conf then postgresql doesn't accept any incoming requests from an TCP/IP port. If you use host= in your connection string you are going to connect to Postgre via TCP/IP, so that's not going to work. If you leave the host= part out of your connection string you connect to Postgre via the Unix domain sockets, which is faster and more secure, but you can't connect with the database via any other PC as the localhost.
******
Sincerely,
Aouie
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-19
lkmorlan at uwaterloo dot ca
12 years ago
This works to get UTF8 data from MSSQL:

<?php
$db
= new PDO('dblib:host=your_hostname;dbname=your_db;charset=UTF-8', $user, $pass);
?>
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-13
Konstantin at Tokar dot ru
15 years ago
Example 5:
<?php
try {
 
$dbh = new PDO('odbc:SAMPLE', 'db2inst1', 'ibmdb2',
      array(
PDO::ATTR_PERSISTENT => true));
.......
} catch (
Exception $e) {
 
$dbh->rollBack();
  echo
"Failed: " . $e->getMessage();
}
?>

We must change the last two lines to catch the error connecting to the database:

} catch (Exception $e) {
  echo "Failed: " . $e->getMessage();
  $dbh->rollBack();
}
?>
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-8
shaolin at adf dot nu
16 years ago
If your having problems re-compiling PHP with PDO as shared module try this.

--enable-pdo=shared
--with-pdo-mysql=shared,/usr/local/mysql
--with-sqlite=shared
--with-pdo-sqlite=shared

1. If PDO is built as a shared modules, all PDO drivers must also be
built as shared modules.
2. If ext/pdo_sqlite is built as a shared module, ext/sqlite must also
be built as a shared module.
3. In the extensions entries, if ext/pdo_sqlite is built as a shared
module, php.ini must specify pdo_sqlite first, followed by sqlite.
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