PDOStatement::fetch
(no version information, might be only in CVS)
PDOStatement::fetch --
Fetches the next row from a result set
Description
mixed
PDOStatement::fetch ( [int fetch_style [, int cursor_orientation [, int cursor_offset]]] )
Ðñïåéäïðïßçóç |
Αυτή η συνάρτηση είναι ΔΟΚΙΜΑΣΤΙΚΗ. Η συμπεριφορά της, το όνομα της και οτιδήποτε άλλο είναι τεκμηριωμένο σχετικά με αυτή την συνάρτηση μπορεί να αλλάξει χωρίς ειδοποίηση σε μελλοντικές εκδόσεις της PHP.
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Fetches a row from a result set associated with a PDOStatement object.
Parameters
- 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 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_LAZY: combines
PDO_FETCH_BOTH and PDO_FETCH_OBJ,
creating the object variable names as they are accessed
PDO_FETCH_OBJ: returns an anonymous object with
property names that correspond to the column names returned in your
result set
PDO_FETCH_NUM: returns an array indexed by column
number as returned in your result set, starting at column 0
- 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.
- 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.
Παραδείγματα
ÐáñÜäåéãìá 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 $result->NAME; print("\n"); ?>
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The above example will output: PDO_FETCH_ASSOC: Return next row as an array indexed by column name
Array
(
[NAME] => apple
[COLOUR] => red
)
PDO_FETCH_BOTH: Return next row as an array indexed by both column name and number
Array
(
[NAME] => banana
[0] => banana
[COLOUR] => yellow
[1] => yellow
)
PDO_FETCH_LAZY: Return next row as an anonymous object with column names as properties
PDORow Object
(
[NAME] => orange
[COLOUR] => orange
)
PDO_FETCH_OBJ: Return next row as an anonymous object with column names as properties
kiwi |
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ÐáñÜäåéãìá 2. Fetching rows with a scrollable cursor
<?php function readDataForwards($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); ?>
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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 |
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Δείτε επίσης
PDO::query() |
PDOStatement::fetchAll() |
PDOStatement::fetchSingle() |
PDOStatement::prepare() |
PDOStatement::setFetchMode() |