PDOStatement->fetch
PLEASE BE AWARE: If you do an OUTER LEFT JOIN and set PDO FetchALL to PDO::FETCH_ASSOC, any primary key you used in the OUTER LEFT JOIN will be set to a blank if there are no records returned in the JOIN.
For example:
<?php
//query the product table and join to the image table and return any images, if we have any, for each product
$sql = "SELECT * FROM product, image
LEFT OUTER JOIN image ON (product.product_id = image.product_id)";
$array = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($array);
?>
The resulting array will look something like this:
Array
(
[0] => Array
(
[product_id] =>
[notes] => "this product..."
[brand] => "Best Yet"
...
The fix is to simply specify your field names in the SELECT clause instead of using the * as a wild card, or, you can also specify the field in addition to the *. The following example returns the product_id field correctly:
<?php
$sql = "SELECT *, product.product_id FROM product, image
LEFT OUTER JOIN image ON (product.product_id = image.product_id)";
$array = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($array);
?>
The resulting array will look something like this:
Array
(
[0] => Array
(
[product_id] => 3
[notes] => "this product..."
[brand] => "Best Yet"
...
PDOStatement->fetchAll
(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)
PDOStatement->fetchAll — Returns an array containing all of the result set rows
Description
array PDOStatement::fetchAll
([ int $fetch_style= PDO::FETCH_BOTH
[, int $column_index
[, array $ctor_args= array()
]]] )
Parameters
- 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.
- ctor_args
-
Arguments of custom class constructor.
Return Values
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.
Examples
Example #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);
?>
The above example will output:
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
)
)
Example #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);
?>
The above example will output:
Array(3)
(
[0] =>
string(5) => apple
[1] =>
string(4) => pear
[2] =>
string(10) => watermelon
)
Example #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(array('apple', 'green'));
$insert->execute(array('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));
?>
The above example will output:
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"
}
}
See Also
- PDO::query() - Executes an SQL statement, returning a result set as a PDOStatement object
- PDOStatement::fetch() - Fetches the next row from a result set
- PDOStatement::fetchColumn() - Returns a single column from the next row of a result set
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::setFetchMode() - Set the default fetch mode for this statement
add a note
User Contributed NotesPDOStatement->fetchAll
Daniel Hofmann
05-May-2009 07:21
05-May-2009 07:21
Ant P.
04-Feb-2009 02:37
04-Feb-2009 02:37
You might find yourself wanting to use FETCH_GROUP and FETCH_ASSOC at the same time, to get your table's primary key as the array key:
<?php
// $stmt is some query like "SELECT rowid, username, comment"
$results = $stmt->fetchAll(PDO::FETCH_GROUP|PDO::FETCH_ASSOC);
// It does work, but not as you might expect:
$results = array(
1234 => array(0 => array('username' => 'abc', 'comment' => '[...]')),
1235 => array(0 => array('username' => 'def', 'comment' => '[...]')),
);
// ...but you can at least strip the useless numbered array out easily:
$results = array_map('reset', $results);
?>
davey at php dot net
03-Nov-2008 02:54
03-Nov-2008 02:54
When passing PDO::FETCH_CLASS as the first argument, this method will accept the class name as the second option:
<?php
$query = $pdo->prepare($sql);
$result = $query->execute($values);
if ($result && $query->rowCount() > 0) {
$records = $query->fetchAll(PDO::FETCH_CLASS, 'Some_Class');
// $record is now an array of Some_Class objects
}
?>
- Davey
mrshelly at hotmail dot com
31-Oct-2008 03:27
31-Oct-2008 03:27
PHP fetchAll Data From SQL Server 2005
if field's data type is varchar(nvarchar), only fetch 255 chars. but the "text" data type is ok.
so, notice! to change the 'varchar' or 'nvarchar' (length > 255) to 'text' data type..
hope to help u.
<?php
$user = 'sa';
$pass = 'pass';
$conn = new PDO('mssql:host=127.0.0.1; dbname=tempdb;', $user, $pass);
$mainSQL = "SELECT field_varchar, field_text FROM table1";
$sth = $conn->prepare($mainSQL);
$sth->setFetchMode(PDO::FETCH_ASSOC);
$sth->execute();
$retRows = $sth->fetchAll();
// the field_varchar field only to fetch 255 chars(max)
// the field_text is ok.
var_dump($retRows);
unset($sth); unset($conn);
?>
harlequin2 at gmx dot de
10-Jun-2008 12:01
10-Jun-2008 12:01
There is also another fetch mode supported on Oracle and MSSQL:
PDO::FETCH_ASSOC
> fetches only column names and omits the numeric index.
If you would like to return all columns from an sql statement with column keys as table headers, it's as simple as this:
<?php
$dbh = new PDO("DS", "USERNAME", "PASSWORD");
$stmt = $dbh->prepare("SELECT * FROM tablename");
$stmt->execute();
$arrValues = $stmt->fetchAll(PDO::FETCH_ASSOC);
// open the table
print "<table wdith=\"100%\">\n";
print "<tr>\n";
// add the table headers
foreach ($arrValues[0] as $key => $useless){
print "<th>$key</th>";
}
print "</tr>";
// display data
foreach ($arrValues as $row){
print "<tr>";
foreach ($row as $key => $val){
print "<td>$val</td>";
}
print "</tr>\n";
}
// close the table
print "</table>\n";
?>
stas at metalinfo dot ru
18-Oct-2006 01:37
18-Oct-2006 01:37
Note, that you can use PDO::FETCH_COLUMN|PDO::FETCH_GROUP pair only while selecting two columns, not like DB_common::getAssoc(), when grouping is set to true.