(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0)
PDOStatement::fetch — Fetches the next row from a result set
$fetch_style
[, int $cursor_orientation = PDO::FETCH_ORI_NEXT
[, int $cursor_offset = 0
]]] ) : mixed
Fetches a row from a result set associated with a PDOStatement object. The
fetch_style parameter determines how PDO returns
the row.
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 value of PDO::ATTR_DEFAULT_FETCH_MODE
(which defaults 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::bindColumn()
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, and calling the constructor afterwards, unless
PDO::FETCH_PROPS_LATE is also given.
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_NAMED: returns an array with the same
form as PDO::FETCH_ASSOC, except that if there are
multiple columns with the same name, the value referred to by that
key will be an array of all the values in the row that had that
column name
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
PDO::FETCH_PROPS_LATE: when used with
PDO::FETCH_CLASS, the constructor of the class is
called before the properties are assigned from the respective column
values.
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.
The return value of this function on success depends on the fetch type. In
all cases, FALSE is returned on failure.
Beispiel #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 $result->name;
print("\n");
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
PDO::FETCH_ASSOC: Return next row as an array indexed by column name
Array
(
[name] => apple
[colour] => red
)
PDO::FETCH_BOTH: Return next row as an array indexed by both column name and number
Array
(
[name] => banana
[0] => banana
[colour] => yellow
[1] => yellow
)
PDO::FETCH_LAZY: Return next row as an anonymous object with column names as properties
PDORow Object
(
[name] => orange
[colour] => orange
)
PDO::FETCH_OBJ: Return next row as an anonymous object with column names as properties
kiwi
Beispiel #2 Fetching rows with a scrollable cursor
<?php
function readDataForwards($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);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Reading forwards: 21 10 5 16 0 5 19 20 10 Reading backwards: 19 20 10 16 0 5 21 10 5
Beispiel #3 Construction order
When objects are fetched via PDO::FETCH_CLASS the object
properties are assigned first, and then the constructor of the class is
invoked. If PDO::FETCH_PROPS_LATE is also given, this
order is reversed, i.e. first the constructor is called, and afterwards the
properties are assigned.
<?php
class Person
{
private $name;
public function __construct()
{
$this->tell();
}
public function tell()
{
if (isset($this->name)) {
echo "I am {$this->name}.\n";
} else {
echo "I don't have a name yet.\n";
}
}
}
$sth = $dbh->query("SELECT * FROM people");
$sth->setFetchMode(PDO::FETCH_CLASS, 'Person');
$person = $sth->fetch();
$person->tell();
$sth->setFetchMode(PDO::FETCH_CLASS|PDO::FETCH_PROPS_LATE, 'Person');
$person = $sth->fetch();
$person->tell();
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
I am Alice. I am Alice. I don't have a name yet. I am Bob.