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# PDO::query

(no version information, might be only in CVS)

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

## Leírás

PDOStatement PDO::query ( string statement )
bool PDO::query ( string statement, int PDO::FETCH_COLUMN, int colno )
bool PDO::query ( string statement, int PDO::FETCH_CLASS, string classname, array ctorargs )
bool 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().

> Megjegyzés: 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.

## Paraméterek

statement

  The SQL statement to prepare and execute.

## Visszatérési értékek

PDO::query() returns a PDOStatement object.

## Példák

Példa 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"; } } ?>`
A fenti példa a következő kimenetet adja:
    apple   red     150
    banana  yellow  250
    kiwi    brown   75
    lemon   yellow  25
    orange  orange  300
    pear    green   150
    watermelon      pink    90

## Lásd még

PDO::exec()
PDO::prepare()
PDOStatement::execute()

Előző | Tartalom | Következő
PDO::prepare | Fel | PDO::quote