405 行
8.8 KiB
PHP
405 行
8.8 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Database Result Class
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*
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* This is the platform-independent result class.
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* This class will not be called directly. Rather, the adapter
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* class for the specific database will extend and instantiate it.
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*
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_result {
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var $conn_id = NULL;
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var $result_id = NULL;
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var $result_array = array();
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var $result_object = array();
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var $custom_result_object = array();
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var $current_row = 0;
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var $num_rows = 0;
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var $row_data = NULL;
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/**
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* Query result. Acts as a wrapper function for the following functions.
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*
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* @access public
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* @param string can be "object" or "array"
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* @return mixed either a result object or array
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*/
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function result($type = 'object')
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{
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if ($type == 'array') return $this->result_array();
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else if ($type == 'object') return $this->result_object();
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else return $this->custom_result_object($type);
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}
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// --------------------------------------------------------------------
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/**
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* Custom query result.
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*
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* @param class_name A string that represents the type of object you want back
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* @return array of objects
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*/
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function custom_result_object($class_name)
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{
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if (array_key_exists($class_name, $this->custom_result_object))
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{
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return $this->custom_result_object[$class_name];
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}
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if ($this->result_id === FALSE OR $this->num_rows() == 0)
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{
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return array();
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}
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// add the data to the object
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$this->_data_seek(0);
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$result_object = array();
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while ($row = $this->_fetch_object())
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{
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$object = new $class_name();
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foreach ($row as $key => $value)
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{
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$object->$key = $value;
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}
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$result_object[] = $object;
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}
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// return the array
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return $this->custom_result_object[$class_name] = $result_object;
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}
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/**
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* Query result. "object" version.
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*
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* @access public
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* @return object
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*/
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function result_object()
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{
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if (count($this->result_object) > 0)
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{
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return $this->result_object;
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}
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// In the event that query caching is on the result_id variable
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// will return FALSE since there isn't a valid SQL resource so
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// we'll simply return an empty array.
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if ($this->result_id === FALSE OR $this->num_rows() == 0)
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{
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return array();
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}
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$this->_data_seek(0);
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while ($row = $this->_fetch_object())
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{
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$this->result_object[] = $row;
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}
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return $this->result_object;
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}
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// --------------------------------------------------------------------
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/**
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* Query result. "array" version.
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*
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* @access public
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* @return array
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*/
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function result_array()
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{
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if (count($this->result_array) > 0)
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{
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return $this->result_array;
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}
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// In the event that query caching is on the result_id variable
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// will return FALSE since there isn't a valid SQL resource so
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// we'll simply return an empty array.
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if ($this->result_id === FALSE OR $this->num_rows() == 0)
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{
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return array();
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}
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$this->_data_seek(0);
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while ($row = $this->_fetch_assoc())
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{
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$this->result_array[] = $row;
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}
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return $this->result_array;
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}
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// --------------------------------------------------------------------
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/**
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* Query result. Acts as a wrapper function for the following functions.
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*
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* @access public
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* @param string
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* @param string can be "object" or "array"
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* @return mixed either a result object or array
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*/
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function row($n = 0, $type = 'object')
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{
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if ( ! is_numeric($n))
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{
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// We cache the row data for subsequent uses
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if ( ! is_array($this->row_data))
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{
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$this->row_data = $this->row_array(0);
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}
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// array_key_exists() instead of isset() to allow for MySQL NULL values
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if (array_key_exists($n, $this->row_data))
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{
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return $this->row_data[$n];
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}
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// reset the $n variable if the result was not achieved
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$n = 0;
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}
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if ($type == 'object') return $this->row_object($n);
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else if ($type == 'array') return $this->row_array($n);
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else return $this->custom_row_object($n, $type);
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}
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// --------------------------------------------------------------------
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/**
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* Assigns an item into a particular column slot
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*
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* @access public
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* @return object
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*/
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function set_row($key, $value = NULL)
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{
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// We cache the row data for subsequent uses
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if ( ! is_array($this->row_data))
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{
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$this->row_data = $this->row_array(0);
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}
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if (is_array($key))
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{
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foreach ($key as $k => $v)
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{
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$this->row_data[$k] = $v;
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}
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return;
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}
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if ($key != '' AND ! is_null($value))
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{
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$this->row_data[$key] = $value;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Returns a single result row - custom object version
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*
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* @access public
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* @return object
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*/
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function custom_row_object($n, $type)
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{
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$result = $this->custom_result_object($type);
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if (count($result) == 0)
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{
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return $result;
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}
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if ($n != $this->current_row AND isset($result[$n]))
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{
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$this->current_row = $n;
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}
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return $result[$this->current_row];
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}
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/**
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* Returns a single result row - object version
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*
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* @access public
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* @return object
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*/
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function row_object($n = 0)
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{
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$result = $this->result_object();
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if (count($result) == 0)
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{
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return $result;
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}
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if ($n != $this->current_row AND isset($result[$n]))
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{
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$this->current_row = $n;
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}
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return $result[$this->current_row];
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}
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// --------------------------------------------------------------------
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/**
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* Returns a single result row - array version
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*
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* @access public
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* @return array
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*/
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function row_array($n = 0)
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{
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$result = $this->result_array();
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if (count($result) == 0)
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{
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return $result;
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}
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if ($n != $this->current_row AND isset($result[$n]))
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{
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$this->current_row = $n;
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}
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return $result[$this->current_row];
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}
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// --------------------------------------------------------------------
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/**
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* Returns the "first" row
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*
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* @access public
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* @return object
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*/
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function first_row($type = 'object')
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{
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$result = $this->result($type);
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if (count($result) == 0)
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{
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return $result;
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}
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return $result[0];
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}
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// --------------------------------------------------------------------
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/**
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* Returns the "last" row
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*
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* @access public
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* @return object
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*/
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function last_row($type = 'object')
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{
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$result = $this->result($type);
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if (count($result) == 0)
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{
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return $result;
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}
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return $result[count($result) -1];
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}
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// --------------------------------------------------------------------
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/**
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* Returns the "next" row
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*
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* @access public
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* @return object
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*/
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function next_row($type = 'object')
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{
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$result = $this->result($type);
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if (count($result) == 0)
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{
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return $result;
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}
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if (isset($result[$this->current_row + 1]))
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{
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++$this->current_row;
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}
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return $result[$this->current_row];
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}
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// --------------------------------------------------------------------
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/**
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* Returns the "previous" row
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*
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* @access public
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* @return object
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*/
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function previous_row($type = 'object')
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{
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$result = $this->result($type);
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if (count($result) == 0)
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{
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return $result;
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}
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if (isset($result[$this->current_row - 1]))
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{
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--$this->current_row;
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}
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return $result[$this->current_row];
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}
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// --------------------------------------------------------------------
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/**
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* The following functions are normally overloaded by the identically named
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* methods in the platform-specific driver -- except when query caching
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* is used. When caching is enabled we do not load the other driver.
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* These functions are primarily here to prevent undefined function errors
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* when a cached result object is in use. They are not otherwise fully
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* operational due to the unavailability of the database resource IDs with
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* cached results.
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*/
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function num_rows() { return $this->num_rows; }
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function num_fields() { return 0; }
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function list_fields() { return array(); }
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function field_data() { return array(); }
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function free_result() { return TRUE; }
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function _data_seek() { return TRUE; }
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function _fetch_assoc() { return array(); }
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function _fetch_object() { return array(); }
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}
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// END DB_result class
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/* End of file DB_result.php */
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/* Location: ./system/database/DB_result.php */
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