mirror of
https://github.com/dg/dibi.git
synced 2025-02-23 10:26:21 +01:00
489 lines
11 KiB
PHP
489 lines
11 KiB
PHP
<?php
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/**
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* dibi - tiny'n'smart database abstraction layer
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* ----------------------------------------------
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*
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* Copyright (c) 2005, 2007 David Grudl aka -dgx- (http://www.dgx.cz)
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*
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* This source file is subject to the "dibi license" that is bundled
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* with this package in the file license.txt.
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*
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* For more information please see http://php7.org/dibi/
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*
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @license http://php7.org/dibi/license dibi license
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* @link http://php7.org/dibi/
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* @package dibi
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*/
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/**
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* dibi result-set abstract class
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*
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* <code>
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* $result = dibi::query('SELECT * FROM [table]');
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*
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* $row = $result->fetch();
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* $value = $result->fetchSingle();
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* $table = $result->fetchAll();
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* $pairs = $result->fetchPairs();
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* $assoc = $result->fetchAssoc('id');
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* $assoc = $result->fetchAssoc('active', 'id');
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*
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* unset($result);
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* </code>
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*
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* @author David Grudl
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @package dibi
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* @version $Revision$ $Date$
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*/
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class DibiResult extends NObject implements IteratorAggregate, Countable
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{
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/**
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* DibiDriverInterface
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* @var array
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*/
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private $driver;
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/**
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* Describes columns types
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* @var array
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*/
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protected $convert;
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/**
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* Describes columns types
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* @var array
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*/
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protected $meta;
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/**
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* Already fetched? Used for allowance for first seek(0)
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* @var bool
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*/
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protected $fetched = FALSE;
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private static $types = array(
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dibi::FIELD_TEXT => 'string',
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dibi::FIELD_BINARY => 'string',
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dibi::FIELD_BOOL => 'bool',
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dibi::FIELD_INTEGER => 'int',
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dibi::FIELD_FLOAT => 'float',
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dibi::FIELD_COUNTER => 'int',
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);
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public function __construct($driver)
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{
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$this->driver = $driver;
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}
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/**
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* Returns the resultset resource
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*
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* @return mixed
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*/
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final public function getResource()
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{
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return $this->driver->getResultResource();
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}
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/**
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* Moves cursor position without fetching row
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*
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* @param int the 0-based cursor pos to seek to
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* @return void
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* @throws DibiException
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*/
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final public function seek($row)
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{
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if ($row === 0 && !$this->fetched) {
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return TRUE;
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}
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$this->driver->seek($row);
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}
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/**
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* Returns the number of rows in a result set
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*
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* @return int
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*/
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final public function rowCount()
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{
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return $this->driver->rowCount();
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}
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/**
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* Fetches the row at current position, process optional type conversion
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* and moves the internal cursor to the next position
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*
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* @return array|FALSE array on success, FALSE if no next record
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*/
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final public function fetch()
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{
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$row = $this->driver->fetch();
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if (!is_array($row)) return FALSE;
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$this->fetched = TRUE;
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// types-converting?
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if ($t = $this->convert) { // little speed-up
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foreach ($row as $key => $value) {
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if (isset($t[$key])) {
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$row[$key] = $this->convert($value, $t[$key]);
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}
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}
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}
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return $row;
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}
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/**
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* Like fetch(), but returns only first field
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*
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* @return mixed value on success, FALSE if no next record
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*/
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final function fetchSingle()
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{
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$row = $this->driver->fetch();
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if (!is_array($row)) return FALSE;
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$this->fetched = TRUE;
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// types-converting?
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if ($t = $this->convert) { // little speed-up
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$value = reset($row);
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$key = key($row);
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return isset($t[$key])
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? $this->convert($value, $t[$key])
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: $value;
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}
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return reset($row);
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}
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/**
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* Fetches all records from table.
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*
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* @return array
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*/
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final function fetchAll()
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{
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$this->seek(0);
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$row = $this->fetch();
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if (!$row) return array(); // empty resultset
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$data = array();
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if (count($row) === 1) {
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$key = key($row);
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do {
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$data[] = $row[$key];
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} while ($row = $this->fetch());
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} else {
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do {
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$data[] = $row;
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} while ($row = $this->fetch());
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}
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return $data;
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}
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/**
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* Fetches all records from table and returns associative tree
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* Associative descriptor: assoc1,*,assoc2,#,assco3
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* builds a tree: $data[value1][index][value2]['assoc3'][value3] = {record}
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*
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* @param string associative descriptor
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* @return array
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* @throws InvalidArgumentException
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*/
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final function fetchAssoc($assoc)
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{
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$this->seek(0);
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$row = $this->fetch();
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if (!$row) return array(); // empty resultset
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$data = NULL;
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$assoc = explode(',', $assoc);
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// check fields
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foreach ($assoc as $as) {
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if ($as !== '*' && $as !== '#' && !array_key_exists($as, $row)) {
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throw new InvalidArgumentException("Unknown column '$as' in associative descriptor");
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}
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}
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if (count($assoc) === 1) { // speed-up
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$as = $assoc[0];
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do {
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$data[ $row[$as] ] = $row;
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} while ($row = $this->fetch());
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return $data;
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}
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$last = count($assoc) - 1;
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if ($assoc[$last] === '#') unset($assoc[$last]);
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// make associative tree
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do {
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$x = & $data;
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// iterative deepening
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foreach ($assoc as $i => $as) {
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if ($as === '*') { // indexed-array node
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$x = & $x[];
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} elseif ($as === '#') { // "record" node
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if ($x === NULL) {
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$x = $row;
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$x = & $x[ $assoc[$i+1] ];
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$x = NULL; // prepare child node
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} else {
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$x = & $x[ $assoc[$i+1] ];
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}
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} else { // associative-array node
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$x = & $x[ $row[ $as ] ];
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}
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}
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if ($x === NULL) $x = $row; // build leaf
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} while ($row = $this->fetch());
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unset($x);
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return $data;
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}
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/**
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* Fetches all records from table like $key => $value pairs
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*
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* @param string associative key
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* @param string value
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* @return array
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* @throws InvalidArgumentException
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*/
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final function fetchPairs($key = NULL, $value = NULL)
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{
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$this->seek(0);
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$row = $this->fetch();
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if (!$row) return array(); // empty resultset
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$data = array();
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if ($value === NULL) {
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if ($key !== NULL) {
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throw new InvalidArgumentException("Either none or both fields must be specified");
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}
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if (count($row) < 2) {
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throw new LoginException("Result must have at least two columns");
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}
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// autodetect
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$tmp = array_keys($row);
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$key = $tmp[0];
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$value = $tmp[1];
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} else {
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if (!array_key_exists($value, $row)) {
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throw new InvalidArgumentException("Unknown value column '$value'");
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}
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if ($key === NULL) { // indexed-array
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do {
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$data[] = $row[$value];
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} while ($row = $this->fetch());
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return $data;
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}
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if (!array_key_exists($key, $row)) {
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throw new InvalidArgumentException("Unknown key column '$key'");
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}
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}
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do {
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$data[ $row[$key] ] = $row[$value];
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} while ($row = $this->fetch());
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return $data;
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}
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/**
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* Automatically frees the resources allocated for this result set
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*
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* @return void
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*/
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public function __destruct()
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{
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@$this->driver->free();
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}
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final public function setType($field, $type = NULL)
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{
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if ($field === TRUE) {
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$this->buildMeta();
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} elseif (is_array($field)) {
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$this->convert = $field;
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} else {
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$this->convert[$field] = $type;
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}
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}
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/** is this needed? */
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final public function getType($field)
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{
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return isset($this->convert[$field]) ? $this->convert[$field] : NULL;
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}
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final public function convert($value, $type)
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{
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if ($value === NULL || $value === FALSE) {
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return $value;
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}
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if (isset(self::$types[$type])) {
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settype($value, self::$types[$type]);
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return $value;
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}
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if ($type === dibi::FIELD_DATE || $type === dibi::FIELD_DATETIME) {
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return strtotime($value); // !!! not good
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}
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return $value;
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}
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/**
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* Gets an array of field names
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*
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* @return array
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*/
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final public function getFields()
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{
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$this->buildMeta();
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return array_keys($this->meta);
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}
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/**
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* Gets an array of meta informations about column
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*
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* @param string column name
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* @return array
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*/
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final public function getMetaData($field)
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{
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$this->buildMeta();
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return isset($this->meta[$field]) ? $this->meta[$field] : FALSE;
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}
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/**
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* Acquires ....
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*
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* @return void
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*/
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final protected function buildMeta()
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{
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if ($this->meta === NULL) {
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$this->meta = $this->driver->buildMeta();
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foreach ($this->meta as $name => $info) {
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$this->convert[$name] = $info['type'];
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}
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}
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}
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/**
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* Displays complete result-set as HTML table for debug purposes
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*
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* @return void
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*/
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public function dump()
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{
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echo "\n<table class=\"dump\">\n<thead>\n\t<tr>\n\t\t<th>#row</th>\n";
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foreach ($this->getFields() as $field) {
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echo "\t\t<th>" . htmlSpecialChars($field) . "</th>\n";
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}
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echo "\t</tr>\n</thead>\n<tbody>\n";
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foreach ($this as $row => $fields) {
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echo "\t<tr>\n\t\t<th>", $row, "</th>\n";
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foreach ($fields as $field) {
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//if (is_object($field)) $field = $field->__toString();
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echo "\t\t<td>", htmlSpecialChars($field), "</td>\n";
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}
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echo "\t</tr>\n";
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}
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echo "</tbody>\n</table>\n";
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}
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/**
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* Required by the IteratorAggregate interface
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* @param int offset
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* @param int limit
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* @return ArrayIterator
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*/
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final public function getIterator($offset = NULL, $limit = NULL)
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{
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return new DibiResultIterator($this, $offset, $limit);
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}
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/**
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* Required by the Countable interface
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* @return int
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*/
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final public function count()
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{
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return $this->rowCount();
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}
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}
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