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);?>
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)
PDO::query — Prepares and executes an SQL statement without placeholders
$query, ?int $fetchMode = PDO::FETCH_COLUMN, int $colno): PDOStatement|false$query,$fetchMode = PDO::FETCH_CLASS,$classname,$constructorArgs$query, ?int $fetchMode = PDO::FETCH_INTO, object $object): PDOStatement|falsePDO::query() prepares and executes an SQL statement in a single function call, returning 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().
Nota:
If the
querycontains placeholders, the statement must be prepared and executed separately using PDO::prepare() and PDOStatement::execute() methods.
queryThe SQL statement to prepare and execute.
If the SQL contains placeholders, PDO::prepare() and PDOStatement::execute() must be used instead. Alternatively, the SQL can be prepared manually before calling PDO::query(), with the data properly formatted using PDO::quote() if the driver supports it.
fetchMode
The default fetch mode for the returned PDOStatement.
It must be one of the PDO::FETCH_* constants.
If this argument is passed to the function, the remaining arguments will be treated as though PDOStatement::setFetchMode() was called on the resultant statement object. The subsequent arguments vary depending on the selected fetch mode.
Returns a PDOStatement object o false in caso di fallimento.
Emits an error with level E_WARNING if the attribute PDO::ATTR_ERRMODE is set
to PDO::ERRMODE_WARNING.
Throws a PDOException if the attribute PDO::ATTR_ERRMODE
is set to PDO::ERRMODE_EXCEPTION.
Example #1 SQL with no placeholders can be executed using PDO::query()
<?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 $row['calories'] . "\n";
}
?>Il precedente esempio visualizzerà:
apple red 150 banana yellow 250 kiwi brown 75 lemon yellow 25 orange orange 300 pear green 150 watermelon pink 90
The handling of errors by this function is controlled by the attribute PDO::ATTR_ERRMODE.Use the following to make it throw an exception:<?php$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);?>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 errorTrying 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 = $db->query('SELECT * FROM `mytable` WHERE true', PDO::FETCH_ASSOC);?>After a lot of hours working with DataLink on Oracle->MySQL and PDO we (me and Adriano Rodrigues, that solve it) discover that PDO (and oci too) need the attribute AUTOCOMMIT set to FALSE to work correctly with.There's 3 ways to set autocommit to false: On constructor, setting the atribute after construct and before query data or initiating a Transaction (that turns off autocommit mode)The examples:<?php// First way - On PDO Constructor$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$pdo->beginTransaction();// now we are ready to query DataLinks?>To use DataLinks on oci just use OCI_DEFAULT on oci_execute() function;I would like to mention fetching rows from SQL query using PDO:<?php$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 = $stm->fetchAll();// iterate over array by index and by nameforeach($rows as $row) { printf("$row[0] $row[1] $row[2]\n"); printf("$row['id'] $row['name'] $row['population']\n");}?>> 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);