mirror of
https://github.com/dg/dibi.git
synced 2025-02-24 19:02:36 +01:00
575 lines
14 KiB
PHP
575 lines
14 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, 2008 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://dibiphp.com/
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*
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* @copyright Copyright (c) 2005, 2008 David Grudl
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* @license http://dibiphp.com/license dibi license
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* @link http://dibiphp.com/
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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, 2008 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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* Translate table
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* @var array
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*/
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private $xlat;
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/**
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* Cache for $driver->getColumnsMeta()
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* @var array
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*/
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private $metaCache;
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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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private $fetched = FALSE;
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/**
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* Qualifiy each column name with the table name?
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* @var array|FALSE
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*/
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private $withTables = FALSE;
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private static $types = array(
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dibi::FIELD_TEXT => 'string',
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dibi::FIELD_BINARY => 'string',
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dibi::FIELD_INTEGER => 'int',
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dibi::FIELD_FLOAT => 'float',
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dibi::FIELD_COUNTER => 'int',
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);
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public function __construct($driver)
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{
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$this->driver = $driver;
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}
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/**
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* Automatically frees the resources allocated for this result set
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*
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* @return void
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*/
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public function __destruct()
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{
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@$this->free();
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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 $this->getDriver()->getResultResource();
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}
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/**
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* Moves cursor position without fetching row
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*
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* @param int the 0-based cursor pos to seek to
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* @return boolean TRUE on success, FALSE if unable to seek to specified record
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* @throws DibiException
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*/
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final public function seek($row)
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{
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return ($row !== 0 || $this->fetched) ? (bool) $this->getDriver()->seek($row) : TRUE;
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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 $this->getDriver()->rowCount();
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}
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/**
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* Frees the resources allocated for this result set
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*
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* @return void
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*/
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final public function free()
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{
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if ($this->driver !== NULL) {
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$this->driver->free();
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$this->driver = NULL;
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}
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}
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/**
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* Qualifiy each column name with the table name?
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*
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* @param bool
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* @return void
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* @throws DibiException
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*/
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final public function setWithTables($val)
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{
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if ($val) {
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if ($this->metaCache === NULL) {
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$this->metaCache = $this->getDriver()->getColumnsMeta();
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}
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$cols = array();
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foreach ($this->metaCache as $col) {
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// intentional ==
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$name = $col['table'] == '' ? $col['name'] : ($col['table'] . '.' . $col['name']);
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if (isset($cols[$name])) {
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$fix = 1;
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while (isset($cols[$name . '#' . $fix])) $fix++;
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$name .= '#' . $fix;
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}
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$cols[$name] = TRUE;
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}
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$this->withTables = array_keys($cols);
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} else {
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$this->withTables = FALSE;
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}
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}
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/**
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* Qualifiy each key with the table name?
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*
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* @return bool
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*/
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final public function getWithTables()
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{
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return (bool) $this->withTables;
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}
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/**
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* Fetches the row at current position, process optional type conversion
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* and moves the internal cursor to the next position
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*
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* @return array|FALSE array on success, FALSE if no next record
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*/
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final public function fetch()
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{
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if ($this->withTables === FALSE) {
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$row = $this->getDriver()->fetch(TRUE);
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if (!is_array($row)) return FALSE;
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} else {
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$row = $this->getDriver()->fetch(FALSE);
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if (!is_array($row)) return FALSE;
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$row = array_combine($this->withTables, $row);
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}
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$this->fetched = TRUE;
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// types-converting?
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if ($this->xlat !== NULL) {
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foreach ($this->xlat as $col => $type) {
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if (isset($row[$col])) {
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$row[$col] = $this->convert($row[$col], $type);
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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 = $this->getDriver()->fetch(TRUE);
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if (!is_array($row)) return FALSE;
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$this->fetched = TRUE;
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$value = reset($row);
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// types-converting?
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$key = key($row);
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if (isset($this->xlat[$key])) {
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return $this->convert($value, $this->xlat[$key]);
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}
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return $value;
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}
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/**
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* Fetches all records from table.
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*
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* @return array
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*/
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final function fetchAll()
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{
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$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,=,assoc3,@
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* builds a tree: $data[assoc1][index][assoc2]['assoc3']->value = {record}
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*
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* @param string associative descriptor
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* @return array
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* @throws InvalidArgumentException
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*/
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final function fetchAssoc($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(',', $assoc);
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// check columns
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foreach ($assoc as $as) {
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if ($as !== '#' && $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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// strip leading = and @
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$assoc[] = '='; // gap
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$last = count($assoc) - 1;
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while ($assoc[$last] === '=' || $assoc[$last] === '@') {
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$leaf = $assoc[$last];
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unset($assoc[$last]);
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$last--;
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if ($last < 0) {
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$assoc[] = '#';
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break;
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}
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}
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// make associative tree
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do {
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$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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} elseif ($as === '@') { // "object" node
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if ($x === NULL) {
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$x = (object) $row;
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$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) { // build leaf
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if ($leaf === '=') $x = $row; else $x = (object) $row;
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}
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} while ($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 ($key !== NULL) {
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throw new InvalidArgumentException("Either none or both columns must be specified");
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}
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if (count($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 $data;
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}
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final public function setType($col, $type = NULL)
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{
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if (is_array($col)) {
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$this->xlat = $col;
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} else {
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$this->xlat[$col] = $type;
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}
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}
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final public function getType($col)
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{
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return isset($this->xlat[$col]) ? $this->xlat[$col] : 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);
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}
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if ($type === dibi::FIELD_BOOL) {
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return ((bool) $value) && $value !== 'f' && $value !== 'F';
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}
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return $value;
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}
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/**
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* Gets an array of meta informations about column
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*
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* @return array
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*/
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final public function getColumnsMeta()
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{
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if ($this->metaCache === NULL) {
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$this->metaCache = $this->getDriver()->getColumnsMeta();
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}
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$cols = array();
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foreach ($this->metaCache as $col) {
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$name = (!$this->withTables || $col['table'] === NULL) ? $col['name'] : ($col['table'] . '.' . $col['name']);
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$cols[$name] = $col;
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}
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return $cols;
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}
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/**
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* Displays complete result-set as HTML table for debug purposes
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*
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* @return void
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*/
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final public function dump()
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{
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$none = TRUE;
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foreach ($this as $i => $row) {
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if ($none) {
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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 ($row as $col => $foo) {
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echo "\t\t<th>" . htmlSpecialChars($col) . "</th>\n";
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}
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echo "\t</tr>\n</thead>\n<tbody>\n";
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$none = FALSE;
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}
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echo "\t<tr>\n\t\t<th>", $i, "</th>\n";
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foreach ($row as $col) {
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//if (is_object($col)) $col = $col->__toString();
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echo "\t\t<td>", htmlSpecialChars($col), "</td>\n";
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}
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echo "\t</tr>\n";
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}
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if ($none) {
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echo '<p><em>empty resultset</em></p>';
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} else {
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echo "</tbody>\n</table>\n";
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}
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}
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/**
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* Required by the IteratorAggregate interface
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* @param int offset
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* @param int limit
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* @return ArrayIterator
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*/
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final public function getIterator($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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* Safe access to property $driver
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*
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* @return DibiDriverInterface
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* @throws DibiException
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*/
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private function getDriver()
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{
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if ($this->driver === NULL) {
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throw new DibiException('Resultset was released from memory');
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}
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return $this->driver;
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}
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}
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