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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().

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 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