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# PDOStatement->fetch()

(no version information, might be only in CVS)

PDOStatement->fetch() -- Fetches the next row from a result set

## Descrição

class PDOStatement {
mixed fetch ( [int fetch_style [, int cursor_orientation [, int cursor_offset]]] )
}

Fetches a row from a result set associated with a PDOStatement object. The `fetch_style` parameter determines how PDO returns the row.

## Parâmetros

`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 0-indexed 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_CLASS`: returns a new instance of the requested class, mapping the columns of the result set to named properties in the class. If `fetch_style` includes PDO::FETCH_CLASSTYPE (e.g. `PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE`) then the name of the class is determined from a value of the first column.

  - `PDO::FETCH_INTO`: updates an existing instance of the requested class, mapping the columns of the result set to named properties in the class

  - `PDO::FETCH_LAZY`: combines `PDO::FETCH_BOTH` and `PDO::FETCH_OBJ`, creating the object variable names as they are accessed

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

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

`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`. To request a scrollable cursor for your PDOStatement object, you must set the `PDO::ATTR_CURSOR` attribute to `PDO::CURSOR_SCROLL` when you prepare the SQL statement with PDO->prepare().

`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.

## Exemplos

Exemplo 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"); ?>`
O exemplo acima irá imprimir:
    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

Exemplo 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); ?>`
O exemplo acima irá imprimir:
    Reading forwards:
    21    10    5
    16    0     5
    19    20    10

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

## Veja também

PDO->query()
PDOStatement->fetchAll()
PDOStatement->fetchColumn()
PDO->prepare()
PDOStatement->setFetchMode()

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