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PDO->query()
Executes an SQL statement, returning a result set as a PDOStatement object
()
PDO {
PDOStatement query(string statement);
}PDO {
PDOStatement query(string statement,
int PDO::FETCH_COLUMN,
int colno);
}PDO {
PDOStatement query(string statement,
int PDO::FETCH_CLASS,
string classname,
array ctorargs);
}PDO {
PDOStatement query(string statement,
int PDO::FETCH_INTO,
object object);
}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().
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.
Examples
Example 1765. 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