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Executes an SQL statement, returning a result set as a PDOStatement object


PDO::query

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

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

Description

PDOStatement PDO::query ( string $statement )
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 )

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.

Data inside the query should be properly escaped.

Return Values

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

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, 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";
    }
}
?>

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 

See Also



Content

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

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