PDOSTATEMENT.SETFETCHMODE(3) 1 PDOSTATEMENT.SETFETCHMODE(3)PDOStatement::setFetchMode - Set the default fetch mode for this statement
SYNOPSIS
public bool PDOStatement::setFetchMode (int $mode)
DESCRIPTION
bool PDOStatement::setFetchMode (int $PDO::FETCH_COLUMN, int $colno) bool PDOStatement::setFetchMode (int $PDO::FETCH_CLASS, string
$classname, array $ctorargs) bool PDOStatement::setFetchMode (int $PDO::FETCH_INTO, object $object)
PARAMETERS
o $mode
- The fetch mode must be one of the PDO::FETCH_* constants.
o $colno
- Column number.
o $classname
- Class name.
o $ctorargs
- Constructor arguments.
o $object
- Object.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
Setting the fetch mode
The following example demonstrates how PDOStatement.setFetchMode(3) changes the default fetch mode for a PDOStatement object.
<?php
$sql = 'SELECT name, colour, calories FROM fruit';
try {
$stmt = $dbh->query($sql);
$result = $stmt->setFetchMode(PDO::FETCH_NUM);
while ($row = $stmt->fetch()) {
print $row[0] . " " . $row[1] . " " . $row[2] . "
";
}
}
catch (PDOException $e) {
print $e->getMessage();
}
?>
The above example will output:
apple red 150
banana yellow 250
orange orange 300
kiwi brown 75
lemon yellow 25
pear green 150
watermelon pink 90
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PDOSTATEMENT.FETCH(3) 1 PDOSTATEMENT.FETCH(3)PDOStatement::fetch - Fetches the next row from a result set
SYNOPSIS
public mixed PDOStatement::fetch ([int $fetch_style], [int $cursor_orientation = PDO::FETCH_ORI_NEXT], [int $cursor_offset])
DESCRIPTION
Fetches a row from a result set associated with a PDOStatement object. The $fetch_style parameter determines how PDO returns the row.
PARAMETERS
o $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).
o PDO::FETCH_ASSOC: returns an array indexed by column name as returned in your result set
o PDO::FETCH_BOTH (default): returns an array indexed by both column name and 0-indexed column number as returned in your
result set
o 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(3) method
o 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.
o PDO::FETCH_INTO: updates an existing instance of the requested class, mapping the columns of the result set to named prop-
erties in the class
o PDO::FETCH_LAZY: combines PDO::FETCH_BOTH and PDO::FETCH_OBJ, creating the object variable names as they are accessed
o 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
o PDO::FETCH_NUM: returns an array indexed by column number as returned in your result set, starting at column 0
o PDO::FETCH_OBJ: returns an anonymous object with property names that correspond to the column names returned in your result
set
o $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(3).
o $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 PDOState-
ment 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(3) was called.
RETURN VALUES
The return value of this function on success depends on the fetch type. In all cases, FALSE is returned on failure.
EXAMPLES
Example #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
");
$result = $sth->fetch(PDO::FETCH_ASSOC);
print_r($result);
print("
");
print("PDO::FETCH_BOTH: ");
print("Return next row as an array indexed by both column name and number
");
$result = $sth->fetch(PDO::FETCH_BOTH);
print_r($result);
print("
");
print("PDO::FETCH_LAZY: ");
print("Return next row as an anonymous object with column names as properties
");
$result = $sth->fetch(PDO::FETCH_LAZY);
print_r($result);
print("
");
print("PDO::FETCH_OBJ: ");
print("Return next row as an anonymous object with column names as properties
");
$result = $sth->fetch(PDO::FETCH_OBJ);
print $result->name;
print("
");
?>
The above example will output:
PDO::FETCH_ASSOC: Return next row as an array indexed by column name
Array
(
[name] => apple
[colour] => red
)
PDO::FETCH_BOTH: Return next row as an array indexed by both column name and number
Array
(
[name] => banana
[0] => banana
[colour] => yellow
[1] => yellow
)
PDO::FETCH_LAZY: Return next row as an anonymous object with column names as properties
PDORow Object
(
[name] => orange
[colour] => orange
)
PDO::FETCH_OBJ: Return next row as an anonymous object with column names as properties
kiwi
Example #2
Fetching rows with a scrollable cursor
<?php
function readDataForwards($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] . " " . $row[1] . " " . $row[2] . "
";
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] . " " . $row[1] . " " . $row[2] . "
";
print $data;
} while ($row = $stmt->fetch(PDO::FETCH_NUM, PDO::FETCH_ORI_PRIOR));
$stmt = null;
}
catch (PDOException $e) {
print $e->getMessage();
}
}
print "Reading forwards:
";
readDataForwards($conn);
print "Reading backwards:
";
readDataBackwards($conn);
?>
The above example will output:
Reading forwards:
21 10 5
16 0 5
19 20 10
Reading backwards:
19 20 10
16 0 5
21 10 5
SEE ALSO PDO.prepare(3), PDOStatement.execute(3), PDOStatement.fetchAll(3), PDOStatement.fetchColumn(3), PDOStatement.fetchObject(3), PDOState-
ment.setFetchMode(3).
PHP Documentation Group PDOSTATEMENT.FETCH(3)