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Fetches the next row from a result set


PDOStatement::fetch

(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)

PDOStatement::fetch Fetches the next row from a result set

Description

mixed PDOStatement::fetch ([ int $fetch_style [, int $cursor_orientation = PDO::FETCH_ORI_NEXT [, int $cursor_offset = 0 ]]] )

Fetches a row from a result set associated with a PDOStatement object. The fetch_style parameter determines how PDO returns the row.

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 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. 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_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

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.

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\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");
?>

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_NUMPDO::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_NUMPDO::FETCH_ORI_LAST);
    do {
      
$data $row[0] . "\t" $row[1] . "\t" $row[2] . "\n";
      print 
$data;
    } while (
$row $stmt->fetch(PDO::FETCH_NUMPDO::FETCH_ORI_PRIOR));
    
$stmt null;
  }
  catch (
PDOException $e) {
    print 
$e->getMessage();
  }
}

print 
"Reading forwards:\n";
readDataForwards($conn);

print 
"Reading backwards:\n";
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 

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