Руководство по PHP
Пред. |  | След.

# PDOStatement::fetch

(no version information, might be only in CVS)

PDOStatement::fetch -- Fetches the next row from a result set

## Описание

mixed PDOStatement::fetch ( [int fetch_style [, int cursor_orientation [, int cursor_offset]]] )

Внимание
Эта функция является ЭКСПЕРИМЕНТАЛЬНОЙ. Поведение этой функции, ее имя и относящаяся к ней документация могут измениться в последующих версиях PHP без уведомления. Используйте эту функцию на свой страх и риск.

Fetches a row from a result set associated with a PDOStatement object.

## Список параметров

fetch_style

  Controls how the next row will be returned to the caller. This value must be one of the PDO_FETCH_* constants, defaulting to PDO_FETCH_BOTH.

  - PDO_FETCH_ASSOC: returns an array indexed by column name as returned in your result set

  - PDO_FETCH_BOTH (default): returns an array indexed by both column name and column number as returned in your result set

  - PDO_FETCH_BOUND: returns `TRUE` and assigns the values of the columns in your result set to the PHP variables to which they were bound with the PDOStatement::bindParam() method

  - PDO_FETCH_LAZY: combines PDO_FETCH_BOTH and PDO_FETCH_OBJ, creating the object variable names as they are accessed

  - PDO_FETCH_OBJ: returns an anonymous object with property names that correspond to the column names returned in your result set

  - PDO_FETCH_NUM: returns an array indexed by column number as returned in your result set, starting at column 0

cursor_orientation

  For a PDOStatement object representing a scrollable cursor, this value determines which row will be returned to the caller. This value must be one of the PDO_FETCH_ORI_* constants, defaulting to PDO_FETCH_ORI_NEXT.

offset

  For a PDOStatement object representing a scrollable cursor for which the cursor_orientation parameter is set to PDO_FETCH_ORI_ABS, this value specifies the absolute number of the row in the result set that shall be fetched.

  For a PDOStatement object representing a scrollable cursor for which the cursor_orientation parameter is set to PDO_FETCH_ORI_REL, this value specifies the row to fetch relative to the cursor position before PDOStatement::fetch() was called.

## Примеры

Пример 1. Fetching rows using different fetch styles
`<?php $sth = $dbh->prepare("SELECT name, colour FROM fruit"); $sth->execute(); /* Exercise PDOStatement::fetch styles */ print("PDO_FETCH_ASSOC: "); print("Return next row as an array indexed by column name\n"); $result = $sth->fetch(PDO_FETCH_ASSOC); print_r($result); print("\n"); print("PDO_FETCH_BOTH: "); print("Return next row as an array indexed by both column name and number\n"); $result = $sth->fetch(PDO_FETCH_BOTH); print_r($result); print("\n"); print("PDO_FETCH_LAZY: "); print("Return next row as an anonymous object with column names as properties\n"); $result = $sth->fetch(PDO_FETCH_LAZY); print_r($result); print("\n"); print("PDO_FETCH_OBJ: "); print("Return next row as an anonymous object with column names as properties\n"); $result = $sth->fetch(PDO_FETCH_OBJ); print $result->NAME; print("\n"); ?>`
Результат выполнения данного примера:
    PDO_FETCH_ASSOC: Return next row as an array indexed by column name
    Array
    (
        [NAME] => apple
        [COLOUR] => red
    )

    PDO_FETCH_BOTH: Return next row as an array indexed by both column name and number
    Array
    (
        [NAME] => banana
        [0] => banana
        [COLOUR] => yellow
        [1] => yellow
    )

    PDO_FETCH_LAZY: Return next row as an anonymous object with column names as properties
    PDORow Object
    (
        [NAME] => orange
        [COLOUR] => orange
    )

    PDO_FETCH_OBJ: Return next row as an anonymous object with column names as properties
    kiwi

Пример 2. Fetching rows with a scrollable cursor
`<?php function readDataForwards($dbh) { $sql = 'SELECT hand, won, bet FROM mynumbers ORDER BY BET'; try { $stmt = $dbh->prepare($sql, array(PDO_ATTR_CURSOR, PDO_CURSOR_SCROLL)); $stmt->execute(); while ($row = $stmt->fetch(PDO_FETCH_NUM, PDO_FETCH_ORI_NEXT)) { $data = $row[0] . "\t" . $row[1] . "\t" . $row[2] . "\n"; print $data; } $stmt = null; } catch (PDOException $e) { print $e->getMessage(); } } function readDataBackwards($dbh) { $sql = 'SELECT hand, won, bet FROM mynumbers ORDER BY bet'; try { $stmt = $dbh->prepare($sql, array(PDO_ATTR_CURSOR, PDO_CURSOR_SCROLL)); $stmt->execute(); $row = $stmt->fetch(PDO_FETCH_NUM, PDO_FETCH_ORI_LAST); do { $data = $row[0] . "\t" . $row[1] . "\t" . $row[2] . "\n"; print $data; } while ($row = $stmt->fetch(PDO_FETCH_NUM, PDO_FETCH_ORI_PRIOR)); $stmt = null; } catch (PDOException $e) { print $e->getMessage(); } } print "Reading forwards:\n"; readDataForwards($conn); print "Reading backwards:\n"; readDataBackwards($conn); ?>`
Результат выполнения данного примера:
    Reading forwards:
    21    10    5
    16    0     5
    19    20    10

    Reading backwards:
    19    20    10
    16    0     5
    21    10    5

## Смотрите также

PDO::query()
PDOStatement::fetchAll()
PDOStatement::fetchSingle()
PDOStatement::prepare()
PDOStatement::setFetchMode()

Пред. | Начало | След.
PDOStatement::execute | Уровень выше | PDOStatement::fetchAll