Compzone.Org :: Podręcznik PHP :: PDOStatement::fetchAll

Podręcznik PHP
Poprzedni		Następny

PDOStatement::fetchAll

(no version information, might be only in CVS)

PDOStatement::fetchAll -- Returns an array containing all of the result set rows

Opis

array PDOStatement::fetchAll ( [int fetch_style [, int column_index]] )

Parametry

fetch_style

Controls the contents of the returned array as documented in PDOStatement::fetch(). Defaults to PDO::FETCH_BOTH.

To return an array consisting of all values of a single column from the result set, specify PDO::FETCH_COLUMN. You can specify which column you want with the column-index parameter.

To fetch only the unique values of a single column from the result set, bitwise-OR PDO::FETCH_COLUMN with PDO::FETCH_UNIQUE.

To return an associative array grouped by the values of a specified column, bitwise-OR PDO::FETCH_COLUMN with PDO::FETCH_GROUP.

column_index

Returns the indicated 0-indexed column when the value of fetch_style is PDO::FETCH_COLUMN. Defaults to 0.

Zwracane wartości

PDOStatement::fetchAll() returns an array containing all of the remaining rows in the result set. The array represents each row as either an array of column values or an object with properties corresponding to each column name.

Using this method to fetch large result sets will result in a heavy demand on system and possibly network resources. Rather than retrieving all of the data and manipulating it in PHP, consider using the database server to manipulate the result sets. For example, use the WHERE and SORT BY clauses in SQL to restrict results before retrieving and processing them with PHP.

Przykłady

Przykład 1. Fetch all remaining rows in a result set

<?php

                $sth = $dbh->prepare("SELECT name, colour FROM fruit");

                $sth->execute();

                
/* Fetch all of the remaining rows in the result set */

                print("Fetch all of the remaining rows in the result set:\n");

                $result = $sth->fetchAll();
print_r($result);
?>

Powyższy przykład wyświetli:

Fetch all of the remaining rows in the result set:
Array
(
    [0] => Array
        (
            [NAME] => pear
            [0] => pear
            [COLOUR] => green
            [1] => green
        )

    [1] => Array
        (
            [NAME] => watermelon
            [0] => watermelon
            [COLOUR] => pink
            [1] => pink
        )

)

Przykład 2. Fetching all values of a single column from a result set

The following example demonstrates how to return all of the values of a single column from a result set, even though the SQL statement itself may return multiple columns per row.

<?php

                $sth = $dbh->prepare("SELECT name, colour FROM fruit");

                $sth->execute();

                
/* Fetch all of the values of the first column */

                $result = $sth->fetchAll(PDO::FETCH_COLUMN, 0);
var_dump($result);
?>

Powyższy przykład wyświetli:

Array(3)
(
    [0] =>
    string(5) => apple
    [1] =>
    string(4) => pear
    [2] =>
    string(10) => watermelon
)

Przykład 3. Grouping all values by a single column

The following example demonstrates how to return an associative array grouped by the values of the specified column in the result set. The array contains three keys: values apple and pear are returned as arrays that contain two different colours, while watermelon is returned as an array that contains only one colour.

<?php

                $insert = $dbh->prepare("INSERT INTO fruit(name, colour) VALUES (?, ?)");

                $insert->execute('apple', 'green');
$insert->execute('pear', 'yellow');

                
$sth = $dbh->prepare("SELECT name, colour FROM fruit");

                $sth->execute();

                
/* Group values by the first column */

                var_dump($sth->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
?>

Powyższy przykład wyświetli:

array(3) {
  ["apple"]=>
  array(2) {
    [0]=>
    string(5) "green"
    [1]=>
    string(3) "red"
  }
  ["pear"]=>
  array(2) {
    [0]=>
    string(5) "green"
    [1]=>
    string(6) "yellow"
  }
  ["watermelon"]=>
  array(1) {
    [0]=>
    string(5) "green"
  }
}

Patrz także

PDO::query()

PDOStatement::fetch()

PDOStatement::fetchColumn()

PDOStatement::prepare()

PDOStatement::setFetchMode()

Poprzedni	Spis treści	Następny
PDOStatement::fetch	Początek rozdziału	PDOStatement::fetchColumn