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PDO::query

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)

PDO::query Executes an SQL statement, returning a result set as a PDOStatement object

Beschreibung

public PDO::query ( string $query , int|null $fetchMode = null ) : PDOStatement|false
public PDO::query ( string $query , int|null $fetchMode = PDO::FETCH_COLUMN , int $colno ) : PDOStatement|false
public PDO::query ( string $query , int|null $fetchMode = PDO::FETCH_CLASS , string $classname , array $constructorArgs ) : PDOStatement|false
public PDO::query ( string $query , int|null $fetchMode = PDO::FETCH_INTO , object $object ) : PDOStatement|false

PDO::query() executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object.

For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO::prepare() and issue the statement with multiple calls to PDOStatement::execute().

If you do not fetch all of the data in a result set before issuing your next call to PDO::query(), your call may fail. Call PDOStatement::closeCursor() to release the database resources associated with the PDOStatement object before issuing your next call to PDO::query().

Hinweis:

If more than one argument is passed to this function, the remaining arguments will be treated as though you called PDOStatement::setFetchMode() on the resultant statement object.

Parameter-Liste

query

The SQL statement to prepare and execute.

Data inside the query should be properly escaped.

Rückgabewerte

PDO::query() returns a PDOStatement object, or false on failure.

Beispiele

Beispiel #1 Demonstrate PDO::query

A nice feature of PDO::query() is that it enables you to iterate over the rowset returned by a successfully executed SELECT statement.

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

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

Siehe auch

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User Contributed Notes 6 notes

up
42
fredrik at NOSPAM dot rambris dot com
14 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:
<?php
$dbh
->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
?>
up
1
Ilyas Bakirov
3 months ago
I would like to mention fetching rows from SQL query using PDO:

<?php

$dbh
= new PDO('mysql:host=localhost;dbname=test', $user, $pass);

// use the connection here
$sth = $dbh->query('SELECT * FROM countries');

// fetch all rows into array, by default PDO::FETCH_BOTH is used
$rows = $stm->fetchAll();

// iterate over array by index and by name
foreach($rows as $row) {

   
printf("$row[0] $row[1] $row[2]\n");
   
printf("$row['id'] $row['name'] $row['population']\n");

}
?>
up
6
dozoyousan at gmail dot com
15 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 );
$pdoObj->setAttribute("PDO::ATTR_ERRMODE", PDO::ERRMODE_EXCEPTION);
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5
marcos at marcosregis dot com
12 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:
<?php
// 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

?>

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

$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,FALSE);
// or
$pdo->beginTransaction();

// now we are ready to query DataLinks
?>

To use DataLinks on oci just use OCI_DEFAULT on oci_execute() function;
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2
stefano[dot]bertoli [at] gmail[dot]com
6 years ago
Trying to pass like second argument PDO::FETCH_ASSOC it still work.

So passing FETCH TYPE like argument seems work.

This save you from something like:

<?php
$result
= $stmt->setFetchMode(PDO::FETCH_NUM);
?>

Example:
<?php
$res
= $db->query('SELECT * FROM `mytable` WHERE true', PDO::FETCH_ASSOC);

?>
up
-21
Anonymous
2 years ago
The Documentation doesn’t mention this, but you can use a fetch style as a second parameter. For example:

<?php
    $data
=$pdo->query($sql,PDO::FETCH_NUM);
    foreach(
$data as $row) {
       
//    etc
   
}
?>
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