CI扩展类的问题求助各位大神

吃货 · 发表于 2013-7-31 14:12:37

这个是我application/libraries/MY_MODEL.php的代码

PHP复制代码

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Extended Model Class
*
* Provides a number of useful functions to generate model specific queries.
* Takes inspiration from CakePHP's implementation of Model and keeps the function
* names pretty same.
*
* A list of functions would be:
*
* - loadTable
* - find
* - findAll
* - findCount
* - field
* - generateList
* - generateSingleArray
* - getAffectedRows
* - getID
* - getInsertID
* - getNumRows
* - insert
* - read
* - save
* - remove
* - query
* - lastQuery
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author Md Emran Hasan (phpfour@gmail.com)
* @link http://phpfour.com
*/
class MY_Model extends CI_Model
{

/**
* Value of the primary key ID of the record that this model is currently pointing to
*
* @var unknown_type
* @access public
*/
var $id = null;

/**
* Container for the data that this model gets from persistent storage (the database).
*
* @var array
* @access public
*/
var $data = array();

/**
* The name of the associate table name of the Model object
* @var string
* @access public
*/
var $_table;

/**
* The name of the ID field for this Model.
*
* @var string
* @access public
*/
var $primaryKey = 'id';

/**
* Container for the fields of the table that this model gets from persistent storage (the database).
*
* @var array
* @access public
*/
var $fields = array();

/**
* The last inserted ID of the data that this model created
*
* @var int
* @access private
*/
var $__insertID = null;

/**
* The number of records returned by the last query
*
* @access private
* @var int
*/
var $__numRows = null;

/**
* The number of records affected by the last query
*
* @access private
* @var int
*/
var $__affectedRows = null;

/**
* Tells the model whether to return results in array or not
*
* @var string
* @access public
*/
var $returnArray = TRUE;

/**
* Prints helpful debug messages if asked
*
* @var string
* @access public
*/
var $debug = FALSE;

/**
* Constructor
*
* @access public
*/
public function __construct()
{
parent::__construct();
log_message('debug', "Extended Model Class Initialized");
}

/**
* Load the associated database table.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @access public
*/

public function loadTable($table, $fields = array())
{
if ($this->debug) log_message('debug', "Loading model table: $table");

$this->_table = $table;
$this->fields = (!empty($fields)) ? $fields : $this->db->list_fields($table);

if ($this->debug)
{
log_message('debug', "Successfully Loaded model table: $table");
}
}

/**
* Returns a resultset array with specified fields from database matching given conditions.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return query result either in array or in object based on model config
* @access public
*/

function findAll($conditions = NULL, $fields = '*', $order = NULL, $start = 0, $limit = NULL)
{
if ($conditions != NULL)
{
if(is_array($conditions))
{
$this->db->where($conditions);
}
else
{
$this->db->where($conditions, NULL, FALSE);
}
}

if ($fields != NULL)
{
$this->db->select($fields);
}

if ($order != NULL)
{
$this->db->orderby($order);
}

if ($limit != NULL)
{
$this->db->limit($limit, $start);
}

$query = $this->db->get($this->_table);
$this->__numRows = $query->num_rows();

return ($this->returnArray) ? $query->result_array() : $query->result();
}

/**
* Return a single row as a resultset array with specified fields from database matching given conditions.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return single row either in array or in object based on model config
* @access public
*/

function find($conditions = NULL, $fields = '*', $order = NULL)
{
$data = $this->findAll($conditions, $fields, $order, 0, 1);

if ($data)
{
return $data[0];
}
else
{
return false;
}
}

/**
* Returns contents of a field in a query matching given conditions.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return string the value of the field specified of the first row
* @access public
*/

function field($conditions = null, $name, $fields = '*', $order = NULL)
{
$data = $this->findAll($conditions, $fields, $order, 0, 1);

if ($data)
{
$row = $data[0];

if (isset($row[$name]))
{
return $row[$name];
}
else
{
return false;
}
}
else
{
return false;
}

}

/**
* Returns number of rows matching given SQL condition.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return integer the number of records returned by the condition
* @access public
*/

function findCount($conditions = null)
{
$data = $this->findAll($conditions, 'COUNT(*) AS count', null, 0, 1);

if ($data)
{
return $data[0]['count'];
}
else
{
return false;
}
}

/**
* Returns a key value pair array from database matching given conditions.
*
* Example use: generateList(null, '', 0. 10, 'id', 'username');
* Returns: array('10' => 'emran', '11' => 'hasan')
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return array a list of key val ue pairs given criteria
* @access public
*/

function generateList($conditions = null, $order = 'id ASC', $start = 0, $limit = NULL, $key = null, $value = null)
{
$data = $this->findAll($conditions, "$key, $value", $order, $start, $limit);

if ($data)
{
foreach ($data as $row)
{
$keys[] = ($this->returnArray) ? $row[$key] : $row->$key;
$vals[] = ($this->returnArray) ? $row[$value] : $row->$value;
}

if (!empty($keys) && !empty($vals))
{
$return = array_combine($keys, $vals);
return $return;
}
}
else
{
return false;
}
}

/**
* Returns an array of the values of a specific column from database matching given conditions.
*
* Example use: generateSingleArray(null, 'name');
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return array a list of key value pairs given criteria
* @access public
*/

function generateSingleArray($conditions = null, $field = null, $order = 'id ASC', $start = 0, $limit = NULL)
{
$data = $this->findAll($conditions, "$field", $order, $start, $limit);

if ($data)
{
foreach ($data as $row)
{
$arr[] = ($this->returnArray) ? $row[$field] : $row->$field;
}

return $arr;
}
else
{
return false;
}
}

/**
* Initializes the model for writing a new record.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return boolean True
* @access public
*/

function create()
{
$this->id = false;
unset ($this->data);

$this->data = array();
return true;
}

/**
* Returns a list of fields from the database and saves in the model
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return array Array of database fields
* @access public
*/

function read($id = null, $fields = null)
{
if ($id != null)
{
$this->id = $id;
}

$id = $this->id;

if ($this->id !== null && $this->id !== false)
{
$this->data = $this->find($this->primaryKey . ' = ' . $id, $fields);
return $this->data;
}
else
{
return false;
}
}

/**
* Inserts a new record in the database.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return boolean success
* @access public
*/

function insert($data = null)
{
if ($data == null)
{
return FALSE;
}

$this->data = $data;
$this->data['create_date'] = date("Y-m-d H:i:s");

foreach ($this->data as $key => $value)
{
if (array_search($key, $this->fields) === FALSE)
{
unset($this->data[$key]);
}
}

$this->db->insert($this->_table, $this->data);

$this->__insertID = $this->db->insert_id();
return $this->__insertID;
}

/**
* Saves model data to the database.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return boolean success
* @access public
*/

function save($data = null, $id = null)
{
if ($data)
{
$this->data = $data;
}

foreach ($this->data as $key => $value)
{
if (array_search($key, $this->fields) === FALSE)
{
unset($this->data[$key]);
}
}

if ($id != null)
{
$this->id = $id;
}

$id = $this->id;

if ($this->id !== null && $this->id !== false)
{
$this->db->where($this->primaryKey, $id);
$this->db->update($this->_table, $this->data);

$this->__affectedRows = $this->db->affected_rows();
return $this->id;
}
else
{
$this->db->insert($this->_table, $this->data);

$this->__insertID = $this->db->insert_id();
return $this->__insertID;
}
}

/**
* Removes record for given id. If no id is given, the current id is used. Returns true on success.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return boolean True on success
* @access public
*/

function remove($id = null)
{
if ($id != null)
{
$this->id = $id;
}

$id = $this->id;

if ($this->id !== null && $this->id !== false)
{
if ($this->db->delete($this->_table, array($this->primaryKey => $id)))
{
$this->id = null;
$this->data = array();

return true;
}
else
{
return false;
}
}
else
{
return false;
}
}

/**
* Returns a resultset for given SQL statement. Generic SQL queries should be made with this method.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return array Resultset
* @access public
*/

function query($sql)
{
return $this->db->query($sql);
}

/**
* Returns the last query that was run (the query string, not the result).
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return string SQL statement
* @access public
*/

function lastQuery()
{
return $this->db->last_query();
}

/**
* This function simplifies the process of writing database inserts. It returns a correctly formatted SQL insert string.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return string SQL statement
* @access public
*/

function insertString($data)
{
return $this->db->insert_string($this->_table, $data);
}

/**
* Returns the current record's ID.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return integer The ID of the current record
* @access public
*/

function getID()
{
return $this->id;
}

/**
* Returns the ID of the last record this Model inserted.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return int
* @access public
*/

function getInsertID()
{
return $this->__insertID;
}

/**
* Returns the number of rows returned from the last query.
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return int
* @access public
*/

function getNumRows()
{
return $this->__numRows;
}

/**
* Returns the number of rows affected by the last query
*
* @author md emran hasan <emran@rightbrainsolution.com>
* @return int
* @access public
*/

function getAffectedRows()
{
return $this->__affectedRows;
}

}
// END Model Class

复制代码

吃货 · 发表于 2013-7-31 14:13:26

这个是我继承的model

PHP复制代码

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/*使用举例：
*
*比如我们建一个 product 的 model
*
*
*/

class Product extends MY_Model {

function __construct()
{
// Call the Model constructor
parent::__construct();
$this->load->database();
}

}

?>

复制代码

吃货 · 发表于 2013-7-31 14:18:32

手册上说放在application/libraries/xxxx.php目录下，我方在这个目录下报这个错误 ! ) Fatal error: Class 'MY_Model' not found in C:\wamp\www\app\application\models\product.php on line 而放在application/lcore/xxxx.php目录下就可以，为什么呢？

dren_a · 发表于 2013-7-31 15:18:08

你扩展的模块放在库目录下。。。

浪迹天涯 · 发表于 2013-7-31 17:00:52

放在application/core目录下

吃货 · 发表于 2013-7-31 20:37:17

浪迹天涯发表于 2013-7-31 17:00
放在application/core目录下

那手册写的放在application/libraries下

吃货 · 发表于 2013-7-31 20:37:36

dren_a 发表于 2013-7-31 15:18
你扩展的模块放在库目录下。。。

是CORE下吧。。。

浪迹天涯 · 发表于 2013-8-5 10:50:22

吃货发表于 2013-7-31 20:37
那手册写的放在application/libraries下

http://codeigniter.org.cn/user_guide/general/core_classes.html

		自动登录	找回密码
密码			入住 CI 中国社区