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PDO::query Ejecuta una sentencia SQL, devolviendo un conjunto de resultados como un objeto PDOStatement


public PDOStatement PDO::query ( string $statement )
public PDOStatement PDO::query ( string $statement , int $PDO::FETCH_COLUMN , int $colno )
public PDOStatement PDO::query ( string $statement , int $PDO::FETCH_CLASS , string $classname , array $ctorargs )
public PDOStatement PDO::query ( string $statement , int $PDO::FETCH_INTO , object $object )

PDO::query() ejecuta una sentencia SQL en una única llamada a función, devolviendo el conjunto de resultados (si los hay) que devuelve la sentencia como un objeto PDOStatement.

Para una consulta que se necesite ejecutar en múltiples ocasiones, se obtendrá una mejor rendimiento si se prepara un objeto PDOStatement usando PDO::prepare() y ejecutando la sentencia con múltiple llamadas a PDOStatement::execute().

Si no se buscan todos los datos del conjunto de resultados antes de ejecutar la siguiente llamada a PDO::query(), ésta puede fallar. Llamando a PDOStatement::closeCursor() se liberan los recursos de la base de datos asociados al objeto PDOStatement antes de ejecutar la siguiente llamada a PDO::query().


Aunque esta función está documentada solamente teniendo un único parámetro, se pueden pasar argumentos adicionales a esta función. Éstos serán tratados como si se llamase a PDOStatement::setFetchMode() con el objeto de la sentencia resultante.



La sentencia SQL a preparar y ejecutar.

Los datos dentro de la consulta deben ser debidamente escapados.

Valores devueltos

PDO::query() devuelve un objeto PDOStatement, o FALSE en caso de error.


Ejemplo #1 Demostración de PDO::query

Una buena característica de PDO::query() es que permite iterar sobre el conjunto de filas devueltos por una ejecución de una sentencia SELECT con éxito.

function getFruit($conn) {
$sql 'SELECT name, color, calories FROM fruit ORDER BY name';
    foreach (
$conn->query($sql) as $row) {
$row['name'] . "\t";
$row['color'] . "\t";
$row['calories'] . "\n";

El resultado del ejemplo sería:

apple   red     150
banana  yellow  250
kiwi    brown   75
lemon   yellow  25
orange  orange  300
pear    green   150
watermelon      pink    90

Ver también

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User Contributed Notes 8 notes

fredrik at NOSPAM dot rambris dot com
7 years ago
The handling of errors by this function is controlled by the attribute PDO::ATTR_ERRMODE.

Use the following to make it throw an exception:
dozoyousan at gmail dot com
8 years ago
> When query() fails, the boolean false is returned.

I think that is "Silent Mode".
If that set attribute ErrorMode "Exception Mode"
then that throw PDOException.
$pdoObj = new PDO( $dsn, $user, $pass );
jonmsawyer at gmail dot com
7 years ago
@ dozoyousan at gmail dot com
> 03-May-2006 05:26
> > When query() fails, the boolean false is returned.
> I think that is "Silent Mode".
> If that set attribute ErrorMode "Exception Mode"
> then that throw PDOException.
> $pdoObj = new PDO( $dsn, $user, $pass );
> $pdoObj->setAttribute("PDO::ATTR_ERRMODE",

What you say is correct, however, your PHP code is incorrect:

// This is fine
$pdoObj = new PDO( $dsn, $user, $pass );
// This line is wrong
// It should be:
// Parameter 1 should not be in quotes. PHP interprets
    // that as a string. Instead, internally, its represented
    // as type LONG INT. Try it :)

Hope this helps. Cheers.
marcos at marcosregis dot com
5 years ago
After a lot of hours working with DataLink on Oracle->MySQL and PDO we (me and Adriano Rodrigues, that solve it) discover that PDO (and oci too) need the attribute AUTOCOMMIT set to FALSE to work correctly with.
There's  3 ways to set autocommit to false: On constructor, setting the atribute after construct and before query data or initiating a Transaction (that turns off autocommit mode)

The examples:
// First way - On PDO Constructor
$options = array(PDO::ATTR_AUTOCOMMIT=>FALSE);

$pdo = new PDO($dsn,$user,$pass,$options);

// now we are ready to query DataLinks


// Second Way - Before create statements
$pdo = new PDO($dsn,$user,$pass);

// or

// now we are ready to query DataLinks

To use DataLinks on oci just use OCI_DEFAULT on oci_execute() function;
paolo at dellunto dot net
10 months ago
If you are using PDO to create an SQLite dbfile that will be used by an Android application, you can set common values via the $dbh->query("PRAGMA ...") statement;

a tipical example would be the user_version of the database or the page_size
$dbh = new PDO($PDO_DSN, null, null, null);
$dbh->query("PRAGMA page_size = 4096"); //Android match page size
$dbh->query("PRAGMA user_version = 2"); //This match super(context, DB_NAME, null, DB_VERSION) of the DatabaseOpenHelper
nicobn at gmail dot com
7 years ago
Please note that when Query() fails, it does not return a PDOStatement object . It simply returns false.
andrea at bhweb dot it
6 years ago
If someone is suffering of the "MySQL server has gone away" problem after executing multiple queries, this is a solution that solved it for me. It's similar to the one needed for the exact same problem in mysqli.

do {
$stmt->fetch(); $stmt->closeCursor(); ++$line; } while($stmt-

I found this only works using prepare and execute this way, not if you
directly execute the query with query().
6 years ago
I found this method extremely useful for getting the iteration count. Note the usage of "for" instead of "while" or "foreach". Just place the "$row = $query->fetch()" as the second condition of your for loop (which is do until). This is the best of both worlds IMHO. Criticism welcome.

try {
    $hostname = "servername";
    $dbname = "dbname";
    $username = "username";
    $pw = "password";
    $pdo = new PDO ("mssql:host=$hostname;dbname=$dbname","$username","$pw");
  } catch (PDOException $e) {
    echo "Failed to get DB handle: " . $e->getMessage() . "\n";
      $query = $pdo->prepare("select name FROM tbl_name");
      for($i=0; $row = $query->fetch(); $i++){
        echo $i." - ".$row['name']."<br/>";

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