PDO::query
(PHP 5 >= 5.1.0, PECL pdo:0.2-1.0.3)
PDO::query —
Executes an SQL statement, returning a result set as a PDOStatement object
Description
PDOStatement PDO::query
(
string $statement
,
int $PDO::FETCH_COLUMN
,
int $colno
)
PDOStatement PDO::query
(
string $statement
,
int $PDO::FETCH_CLASS
,
string $classname
,
array $ctorargs
)
PDOStatement PDO::query
(
string $statement
,
int $PDO::FETCH_INTO
,
object $object
)
For a query that you need to issue multiple times, you will realize better
performance if you prepare a PDOStatement object using
PDO::prepare() and issue the statement with multiple
calls to PDOStatement::execute().
If you do not fetch all of the data in a result set before issuing your
next call to PDO::query(), your call may fail. Call
PDOStatement::closeCursor() to release the database
resources associated with the PDOStatement object before issuing your
next call to PDO::query().
Note:
Although this function is only documented as having a single
parameter, you may pass additional arguments to this function.
They will be treated as though you called
PDOStatement::setFetchMode() on the resultant statement
object.
Parameters
-
statement
-
The SQL statement to prepare and execute.
Return Values
PDO::query() returns a PDOStatement object.
Examples
Example #1 Demonstrate PDO::query
A nice feature of PDO::query() is that it
enables you to iterate over the rowset returned by a
successfully executed SELECT statement.
<?php
function getFruit($conn) {
$sql = 'SELECT name, colour, calories FROM fruit ORDER BY name';
foreach ($conn->query($sql) as $row) {
print $row['NAME'] . "\t";
print $row['COLOUR'] . "\t";
print $row['CALORIES'] . "\n";
}
}
?>
The above example will output:
apple red 150
banana yellow 250
kiwi brown 75
lemon yellow 25
orange orange 300
pear green 150
watermelon pink 90
PDO::prepare
