<?php
/**
* A base model with a series of CRUD functions (powered by CI's query builder),
* validation-in-model support, event callbacks and more.
*
* @link http://github.com/jamierumbelow/codeigniter-base-model
* @copyright Copyright (c) 2012, Jamie Rumbelow <http://jamierumbelow.net>
*/
class MY_Model extends CI_Model
{
/* --------------------------------------------------------------
* VARIABLES
* ------------------------------------------------------------ */
/**
* This model's default database table. Automatically
* guessed by pluralising the model name.
*/
protected $_table;
/**
* Database conn object; will use default connection
* unless overridden
*/
protected $_db;
/**
* This model's default primary key or unique identifier.
* Used by the get(), update() and delete() functions.
*/
protected $primary_key = 'id';
/**
* Support for soft deletes and this model's 'deleted' key
*/
protected $soft_delete = FALSE;
protected $soft_delete_key = 'deleted';
protected $_temporary_with_deleted = FALSE;
/**
* The various callbacks available to the model. Each are
* simple lists of method names (methods will be run on $this).
*/
protected $before_create = array();
protected $after_create = array();
protected $before_update = array();
protected $after_update = array();
protected $before_get = array();
protected $after_get = array();
protected $before_delete = array();
protected $after_delete = array();
protected $callback_parameters = array();
/**
* Protected, non-modifiable attributes
*/
protected $protected_attributes = array();
/**
* Relationship arrays. Use flat strings for defaults or string
* => array to customise the class name and primary key
*/
protected $belongs_to = array();
protected $has_many = array();
protected $_with = array();
/**
* An array of validation rules. This needs to be the same format
* as validation rules passed to the Form_validation library.
*/
protected $validate = array();
/**
* Optionally skip the validation. Used in conjunction with
* skip_validation() to skip data validation for any future calls.
*/
protected $skip_validation = FALSE;
/**
* By default we return our results as objects. If we need to override
* this, we can, or, we could use the `as_array()` and `as_object()` scopes.
*/
protected $return_type = 'object';
protected $_temporary_return_type = NULL;
protected $select_field = FALSE;
/* --------------------------------------------------------------
* GENERIC METHODS
* ------------------------------------------------------------ */
/**
* Initialise the model, tie into the CodeIgniter superobject and
* try our best to guess the table name.
*/
public function __construct()
{
parent::__construct();
$this->load->helper('inflector');
$this->_set_database();
$this->_fetch_table();
array_unshift($this->before_create, 'protect_attributes');
array_unshift($this->before_update, 'protect_attributes');
$this->_temporary_return_type = $this->return_type;
}
/* --------------------------------------------------------------
* CRUD INTERFACE
* ------------------------------------------------------------ */
/**
* Fetch a single record based on the primary key. Returns an object.
*/
public function get($primary_value)
{
$this->trigger('before_get');
if($this->select_field)
{
$this->db->select($this->select_field);
}
if ($this->soft_delete && $this->_temporary_with_deleted !== TRUE)
{
$this->db->where($this->soft_delete_key, FALSE);
}
$row = $this->db->where($this->primary_key, $primary_value)
->get($this->_table)
->{$this->_return_type()}();
$this->_temporary_return_type = $this->return_type;
$row = $this->trigger('after_get', $row);
$this->_with = array();
return $row;
}
/**
* 条件查询指定字段方法
* @param string $key 字段值
* @param string $val 字段名
* @param string $select_field 查询值
* @return Ambiguous
*/
public function getfield_by($key,$val,$select_field=FALSE)
{
if($select_field)
{
$this->select_field = $select_field;
}
return $this->get_by($key,$val);
}
/**
* Fetch a single record based on an arbitrary WHERE call. Can be
* any valid value to $this->db->where().
*/
public function get_by()
{
$where = func_get_args();
$this->_set_where($where);
if ($this->soft_delete && $this->_temporary_with_deleted !== TRUE)
{
$this->db->where($this->soft_delete_key, FALSE);
}
$this->trigger('before_get');
if($this->select_field)
{
$this->db->select($this->select_field);
}
$row = $this->db->get($this->_table)
->{$this->_return_type()}();
$this->_temporary_return_type = $this->return_type;
$row = $this->trigger('after_get', $row);
$this->_with = array();
return $row;
}
/**
* Fetch an array of records based on an array of primary values.
*/
public function get_many($values)
{
if($this->select_field)
{
$this->db->select($this->select_field);
}
$this->db->where_in($this->primary_key, $values);
return $this->get_all();
}
/**
* Fetch an array of records based on an arbitrary WHERE call.
*/
//两个参数 get_many_by($key,$value);
public function get_many_by()
{
$where = func_get_args();
$this->_set_where($where);
return $this->get_all();
}
/**
* Fetch all the records in the table. Can be used as a generic call
* to $this->db->get() with scoped methods.
*/
public function get_all()
{
$this->trigger('before_get');
if ($this->soft_delete && $this->_temporary_with_deleted !== TRUE)
{
$this->db->where($this->soft_delete_key, FALSE);
}
if($this->select_field)
{
$this->db->select($this->select_field);
}
$result = $this->db->get($this->_table)
->{$this->_return_type(1)}();
$this->_temporary_return_type = $this->return_type;
foreach ($result as $key => &$row)
{
$row = $this->trigger('after_get', $row, ($key == count($result) - 1));
}
$this->_with = array();
return $result;
}
/**
* Insert a new row into the table. $data should be an associative array
* of data to be inserted. Returns newly created ID.
*/
public function insert($data, $skip_validation = FALSE)
{
$valid = TRUE;
if ($skip_validation === FALSE)
{
$data = $this->validate($data);
}
if ($data !== FALSE)
{
$data = $this->trigger('before_create', $data);
$this->db->insert($this->_table, $data);
$insert_id = $this->db->insert_id();
$this->trigger('after_create', $insert_id);
return $insert_id;
}
else
{
return FALSE;
}
}
/**
* Insert multiple rows into the table. Returns an array of multiple IDs.
*/
public function insert_many($data, $skip_validation = FALSE)
{
$ids = array();
foreach ($data as $key => $row)
{
$ids[] = $this->insert($row, $skip_validation, ($key == count($data) - 1));
}
return $ids;
}
/**
* Updated a record based on the primary value.
*/
public function update($primary_value, $data, $skip_validation = FALSE)
{
$valid = TRUE;
$data = $this->trigger('before_update', $data);
if ($skip_validation === FALSE)
{
$data = $this->validate($data);
}
if ($data !== FALSE)
{
$result = $this->db->where($this->primary_key, $primary_value)
->set($data)
->update($this->_table);
$this->trigger('after_update', array($data, $result));
return $result;
}
else
{
return FALSE;
}
}
/**
* Update many records, based on an array of primary values.
*/
public function update_many($primary_values, $data, $skip_validation = FALSE)
{
$data = $this->trigger('before_update', $data);
if ($skip_validation === FALSE)
{
$data = $this->validate($data);
}
if ($data !== FALSE)
{
$result = $this->db->where_in($this->primary_key, $primary_values)
->set($data)
->update($this->_table);
$this->trigger('after_update', array($data, $result));
return $result;
}
else
{
return FALSE;
}
}
/**
* Updated a record based on an arbitrary WHERE clause.
*/
public function update_by()
{
$args = func_get_args();
$data = array_pop($args);
$this->_set_where($args);
$data = $this->trigger('before_update', $data);
if ($this->validate($data) !== FALSE)
{
$result = $this->db->set($data)
->update($this->_table);
$this->trigger('after_update', array($data, $result));
return $result;
}
else
{
return FALSE;
}
}
/**
* Update all records
*/
public function update_all($data)
{
$data = $this->trigger('before_update', $data);
$result = $this->db->set($data)
->update($this->_table);
$this->trigger('after_update', array($data, $result));
return $result;
}
/**
* Delete a row from the table by the primary value
*/
public function delete($id)
{
$this->trigger('before_delete', $id);
$this->db->where($this->primary_key, $id);
if ($this->soft_delete)
{
$result = $this->db->update($this->_table, array( $this->soft_delete_key => TRUE ));
}
else
{
$result = $this->db->delete($this->_table);
}
$this->trigger('after_delete', $result);
return $result;
}
/**
* Delete a row from the database table by an arbitrary WHERE clause
*/
public function delete_by()
{
$where = func_get_args();
$this->_set_where($where);
$where = $this->trigger('before_delete', $where);
if ($this->soft_delete)
{
$result = $this->db->update($this->_table, array( $this->soft_delete_key => TRUE ));
}
else
{
$result = $this->db->delete($this->_table);
}
$this->trigger('after_delete', $result);
return $result;
}
/**
* Delete many rows from the database table by multiple primary values
*/
public function delete_many($primary_values)
{
$primary_values = $this->trigger('before_delete', $primary_values);
$this->db->where_in($this->primary_key, $primary_values);
if ($this->soft_delete)
{
$result = $this->db->update($this->_table, array( $this->soft_delete_key => TRUE ));
}
else
{
$result = $this->db->delete($this->_table);
}
$this->trigger('after_delete', $result);
return $result;
}
/**
* Truncates the table
*/
public function truncate()
{
$result = $this->db->truncate($this->_table);
return $result;
}
/* --------------------------------------------------------------
* RELATIONSHIPS
* ------------------------------------------------------------ */
public function with($relationship)
{
$this->_with[] = $relationship;
if (!in_array('relate', $this->after_get))
{
$this->after_get[] = 'relate';
}
return $this;
}
public function relate($row)
{
foreach ($this->belongs_to as $key => $value)
{
if (is_string($value))
{
$relationship = $value;
$options = array( 'primary_key' => $value . '_id', 'model' => $value . '_model' );
}
else
{
$relationship = $key;
$options = $value;
}
if (in_array($relationship, $this->_with))
{
$this->load->model($options['model']);
if (is_object($row))
{
$row->{$relationship} = $this->{$options['model']}->get($row->{$options['primary_key']});
}
else
{
$row[$relationship] = $this->{$options['model']}->get($row[$options['primary_key']]);
}
}
}
foreach ($this->has_many as $key => $value)
{
if (is_string($value))
{
$relationship = $value;
$options = array( 'primary_key' => singular($this->_table) . '_id', 'model' => singular($value) . '_model' );
}
else
{
$relationship = $key;
$options = $value;
}
if (in_array($relationship, $this->_with))
{
$this->load->model($options['model']);
if (is_object($row))
{
$row->{$relationship} = $this->{$options['model']}->get_many_by($options['primary_key'], $row->{$this->primary_key});
}
else
{
$row[$relationship] = $this->{$options['model']}->get_many_by($options['primary_key'], $row[$this->primary_key]);
}
}
}
return $row;
}
/* --------------------------------------------------------------
* UTILITY METHODS
* ------------------------------------------------------------ */
/**
* Retrieve and generate a form_dropdown friendly array
*/
function dropdown()
{
$args = func_get_args();
if(count($args) == 2)
{
list($key, $value) = $args;
}
else
{
$key = $this->primary_key;
$value = $args[0];
}
$this->trigger('before_dropdown', array( $key, $value ));
if ($this->soft_delete && $this->_temporary_with_deleted !== TRUE)
{
$this->db->where($this->soft_delete_key, FALSE);
}
$result = $this->db->select(array($key, $value))
->get($this->_table)
->result();
$options = array();
foreach ($result as $row)
{
$options[$row->{$key}] = $row->{$value};
}
$options = $this->trigger('after_dropdown', $options);
return $options;
}
/**
* Fetch a count of rows based on an arbitrary WHERE call.
*/
public function count_by()
{
$where = func_get_args();
$this->_set_where($where);
return $this->db->count_all_results($this->_table);
}
/**
* Fetch a total count of rows, disregarding any previous conditions
*/
public function count_all()
{
//echo $this->_table;exit;
return $this->db->count_all($this->_table);
}
/**
* Tell the class to skip the insert validation
*/
public function skip_validation()
{
$this->skip_validation = TRUE;
return $this;
}
/**
* Get the skip validation status
*/
public function get_skip_validation()
{
return $this->skip_validation;
}
/**
* Return the next auto increment of the table. Only tested on MySQL.
*/
public function get_next_id()
{
return (int) $this->db->select('AUTO_INCREMENT')
->from('information_schema.TABLES')
->where('TABLE_NAME', $this->_table)
->where('TABLE_SCHEMA', $this->db->database)->get()->row()->AUTO_INCREMENT;
}
/**
* Getter for the table name
*/
public function table()
{
return $this->_table;
}
/* --------------------------------------------------------------
* GLOBAL SCOPES
* ------------------------------------------------------------ */
/**
* Return the next call as an array rather than an object
*/
public function as_array()
{
$this->_temporary_return_type = 'array';
return $this;
}
/**
* Return the next call as an object rather than an array
*/
public function as_object()
{
$this->_temporary_return_type = 'object';
return $this;
}
/**
* Don't care about soft deleted rows on the next call
*/
public function with_deleted()
{
$this->_temporary_with_deleted = TRUE;
return $this;
}
/* --------------------------------------------------------------
* OBSERVERS
* ------------------------------------------------------------ */
/**
* MySQL DATETIME created_at and updated_at
*/
public function created_at($row)
{
if (is_object($row))
{
$row->created_at = date('Y-m-d H:i:s');
}
else
{
$row['created_at'] = date('Y-m-d H:i:s');
}
return $row;
}
public function updated_at($row)
{
if (is_object($row))
{
$row->updated_at = date('Y-m-d H:i:s');
}
else
{
$row['updated_at'] = date('Y-m-d H:i:s');
}
return $row;
}
/**
* Serialises data for you automatically, allowing you to pass
* through objects and let it handle the serialisation in the background
*/
public function serialize($row)
{
foreach ($this->callback_parameters as $column)
{
$row[$column] = serialize($row[$column]);
}
return $row;
}
public function unserialize($row)
{
foreach ($this->callback_parameters as $column)
{
if (is_array($row))
{
$row[$column] = unserialize($row[$column]);
}
else
{
$row->$column = unserialize($row->$column);
}
}
return $row;
}
/**
* Protect attributes by removing them from $row array
*/
public function protect_attributes($row)
{
foreach ($this->protected_attributes as $attr)
{
if (is_object($row))
{
unset($row->$attr);
}
else
{
unset($row[$attr]);
}
}
return $row;
}
/* --------------------------------------------------------------
* QUERY BUILDER DIRECT ACCESS METHODS
* ------------------------------------------------------------ */
/**
* A wrapper to $this->db->order_by()
*/
public function order_by($criteria, $order = 'ASC')
{
if ( is_array($criteria) )
{
foreach ($criteria as $key => $value)
{
$this->db->order_by($key, $value);
}
}
else
{
$this->db->order_by($criteria, $order);
}
return $this;
}
/**
* A wrapper to $this->db->limit()
*/
public function limit($limit, $offset = 0)
{
$this->db->limit($limit, $offset);
return $this;
}
/* --------------------------------------------------------------
* INTERNAL METHODS
* ------------------------------------------------------------ */
/**
* Trigger an event and call its observers. Pass through the event name
* (which looks for an instance variable $this->event_name), an array of
* parameters to pass through and an optional 'last in interation' boolean
*///$$this->trigger('after_delete', $result);
public function trigger($event, $data = FALSE, $last = TRUE)
{
if (isset($this->$event) && is_array($this->$event))
{
foreach ($this->$event as $method)
{
if (strpos($method, '('))
{
preg_match('/([a-zA-Z0-9\_\-]+)(\(([a-zA-Z0-9\_\-\., ]+)\))?/', $method, $matches);
$method = $matches[1];
$this->callback_parameters = explode(',', $matches[3]);
}
$data = call_user_func_array(array($this, $method), array($data, $last));
}
}
return $data;
}
/**
* Run validation on the passed data
*/
public function validate($data)
{
if($this->skip_validation)
{
return $data;
}
if(!empty($this->validate))
{
foreach($data as $key => $val)
{
$_POST[$key] = $val;
}
$this->load->library('form_validation');
if(is_array($this->validate))
{
$this->form_validation->set_rules($this->validate);
if ($this->form_validation->run() === TRUE)
{
return $data;
}
else
{
return FALSE;
}
}
else
{
if ($this->form_validation->run($this->validate) === TRUE)
{
return $data;
}
else
{
return FALSE;
}
}
}
else
{
return $data;
}
}
/**
* Guess the table name by pluralising the model name
*/
private function _fetch_table()
{
if ($this->_table == NULL)
{
$this->_table = plural(preg_replace('/(_m|_model)?$/', '', strtolower(get_class($this))));
}
}
/* --------------------------------------------------------------
* MULTIPLE DB LOADING
* ------------------------------------------------------------ */
private function _set_database()
{
if (!$this->_db)
{
$this->load->database();
}
else
{
$this->db = $this->load->database($this->_db, TRUE);
}
}
/**
* Set WHERE parameters, cleverly
*/
protected function _set_where($params)
{
if (count($params) == 1)
{
$this->db->where($params[0]);
}
else
{
$this->db->where($params[0], $params[1]);
}
}
/**
* Return the method name for the current return type
*/
protected function _return_type($multi = FALSE)
{
$method = ($multi) ? 'result' : 'row';
return $this->_temporary_return_type == 'array' ? $method . '_array' : $method;
}
}
来源：https://www.cnblogs.com/jphp/archive/2013/04/21/3034635.html