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    PDO::query

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

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

    Descrierea

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

    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().

    Notă:

    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.

    Parametri

    statement

    The SQL statement to prepare and execute.

    Data inside the query should be properly escaped.

    Valorile întoarse

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

    Exemple

    Example #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";
    }
    ?>

    Exemplul de mai sus va afișa:

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

    A se vedea și

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    User Contributed Notes 6 notes

    up
    42
    fredrik at NOSPAM dot rambris dot com
    17 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
    2
    Ilyas Bakirov
    3 years 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
    3
    stefano[dot]bertoli [at] gmail[dot]com
    10 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
    1
    JJimenez
    1 year ago
    When you make a wraper for PDO:query, you must define the method like this:

    public function query( string $sql,  ?int $fetchMode = null, mixed ...$fetchModeArgs) : \PDOStatement|false
       
    if you delete one of the parameters or use one of the oficials parameters you get a Fatal error
    up
    0
    dozoyousan at gmail dot com
    18 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);
    up
    -2
    marcos at marcosregis dot com
    16 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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