我想在 codeigniter 模型中创建一个 SQL 视图。最好的方法是什么？
我根据需要工作的桌子使用多个模型
应用程序/核心/MY_model.php
<?php
/**
* CRUD Model
* A base model providing CRUD, pagination and validation.
*/
class MY_Model extends CI_Model
{
public $table;
public $primary_key;
public $default_limit = 15;
public $page_links;
public $query;
public $form_values = array();
protected $default_validation_rules = 'validation_rules';
protected $validation_rules;
public $validation_errors;
public $total_rows;
public $date_created_field;
public $date_modified_field;
public $native_methods = array(
'select', 'select_max', 'select_min', 'select_avg', 'select_sum', 'join',
'where', 'or_where', 'where_in', 'or_where_in', 'where_not_in', 'or_where_not_in',
'like', 'or_like', 'not_like', 'or_not_like', 'group_by', 'distinct', 'having',
'or_having', 'order_by', 'limit'
);
function __construct()
{
parent::__construct();
}
public function __call($name, $arguments)
{
call_user_func_array(array($this->db, $name), $arguments);
return $this;
}
/**
* Sets CI query object and automatically creates active record query
* based on methods in child model.
* $this->model_name->get()
*/
public function get($with = array(), $include_defaults = true)
{
if ($include_defaults) {
$this->set_defaults();
}
foreach ($with as $method) {
$this->$method();
}
$this->query = $this->db->get($this->table);
return $this;
}
/**
* Query builder which listens to methods in child model.
* @param type $exclude
*/
private function set_defaults($exclude = array())
{
$native_methods = $this->native_methods;
foreach ($exclude as $unset_method) {
unset($native_methods[array_search($unset_method, $native_methods)]);
}
foreach ($native_methods as $native_method) {
$native_method = 'default_' . $native_method;
if (method_exists($this, $native_method)) {
$this->$native_method();
}
}
}
/**
* Call when paginating results.
* $this->model_name->paginate()
*/
public function paginate($with = array())
{
$uri_segment = '';
$offset = 0;
$per_page = $this->default_limit;
$this->load->helper('url');
$this->load->library('pagination');
$this->set_defaults();
foreach ($with as $method) {
$this->$method();
}
$this->total_rows = $this->db->count_all_results($this->table);
$uri_segments = $this->uri->segment_array();
foreach ($uri_segments as $key => $segment) {
if ($segment == 'page') {
$uri_segment = $key + 1;
if (isset($uri_segments[$uri_segment])) {
$offset = $uri_segments[$uri_segment];
}
unset($uri_segments[$key], $uri_segments[$key + 1]);
$base_url = site_url(implode('/', $uri_segments) . '/page/');
}
}
if (!$uri_segment) {
$base_url = site_url($this->uri->uri_string() . '/page/');
}
$config = array(
'base_url' => $base_url,
'uri_segment' => $uri_segment,
'total_rows' => $this->total_rows,
'per_page' => $per_page
);
if ($this->config->item('pagination_style')) {
$config = array_merge($config, $this->config->item('pagination_style'));
}
$this->pagination->initialize($config);
$this->page_links = $this->pagination->create_links();
/**
* Done with pagination, now on to the paged results
*/
$this->set_defaults();
foreach ($with as $method) {
$this->$method();
}
$this->db->limit($per_page, $offset);
$this->query = $this->db->get($this->table);
return $this;
}
function paginate_api($limit, $offset)
{
$this->set_defaults();
if (empty($limit)) {
$limit = $this->default_limit;
}
if (empty($offset)) {
$offset = 0;
}
$this->db->limit($limit, $offset);
return $this->db->get($this->table)->result();
}
/**
* Retrieves a single record based on primary key value.
*/
public function get_by_id($id, $with = array())
{
foreach ($with as $method) {
$this->$method();
}
return $this->where($this->primary_key, $id)->get()->row();
}
public function save($id = NULL, $db_array = NULL)
{
if (!$db_array) {
$db_array = $this->db_array();
}
if (!$id) {
if ($this->date_created_field) {
$db_array[$this->date_created_field] = time();
}
$this->db->insert($this->table, $db_array);
// $this->session->set_flashdata('alert_success', 'Record successfully created.');
return $this->db->insert_id();
} else {
if ($this->date_modified_field) {
$db_array[$this->date_modified_field] = time();
}
$this->db->where($this->primary_key, $id);
$this->db->update($this->table, $db_array);
// $this->session->set_flashdata('alert_success', 'Record successfully updated.');
return $id;
}
}
/**
* Returns an array based on $_POST input matching the ruleset used to
* validate the form submission.
*/
public function db_array()
{
$db_array = array();
$validation_rules = $this->{$this->validation_rules}();
foreach ($this->input->post() as $key => $value) {
if (array_key_exists($key, $validation_rules)) {
$db_array[$key] = $value;
}
}
return $db_array;
}
/**
* Deletes a record based on primary key value.
* $this->model_name->delete(5);
*/
public function delete($id, $others = array())
{
if (!empty($others)) {
foreach ($others as $k => $v) {
$this->db->where($k, $v);
}
} else {
$this->db->where($this->primary_key, $id);
}
return $this->db->delete($this->table);
// $this->session->set_flashdata('alert_success', 'Record successfully deleted.');
}
/**
* Returns the CI query result object.
* $this->model_name->get()->result();
*/
public function result()
{
return $this->query->result();
}
/**
* Returns the CI query row object.
* $this->model_name->get()->row();
*/
public function row()
{
return $this->query->row();
}
/**
* Returns CI query result array.
* $this->model_name->get()->result_array();
*/
public function result_array()
{
return $this->query->result_array();
}
/**
* Returns CI query row array.
* $this->model_name->get()->row_array();
*/
public function row_array()
{
return $this->query->row_array();
}
/**
* Returns CI query num_rows().
* $this->model_name->get()->num_rows();
*/
public function num_rows()
{
return $this->query->num_rows();
}
/**
* Used to retrieve record by ID and populate $this->form_values.
* @param int $id
*/
public function prep_form($id = NULL)
{
if (!$_POST and ($id)) {
$this->db->where($this->primary_key, $id);
$row = $this->db->get($this->table)->row();
foreach ($row as $key => $value) {
$this->form_values[$key] = $value;
}
}
}
/**
* Performs validation on submitted form. By default, looks for method in
* child model called validation_rules, but can be forced to run validation
* on any method in child model which returns array of validation rules.
* @param string $validation_rules
* @return boolean
*/
public function run_validation($validation_rules = NULL)
{
if (!$validation_rules) {
$validation_rules = $this->default_validation_rules;
}
foreach (array_keys($_POST) as $key) {
$this->form_values[$key] = $this->input->post($key);
}
if (method_exists($this, $validation_rules)) {
$this->validation_rules = $validation_rules;
$this->load->library('form_validation');
$this->form_validation->set_rules($this->$validation_rules());
$run = $this->form_validation->run();
$this->validation_errors = validation_errors();
return $run;
}
}
/**
* Returns the assigned form value to a form input element.
* @param type $key
* @return type
*/
public function form_value($key)
{
return (isset($this->form_values[$key])) ? $this->form_values[$key] : '';
}
}
然后，当我需要特定数据库的模型时，我在模型中使用类
模型/content.php
class content_types extends MY_Model
{
function __construct()
{
parent::__construct();
$this->curentuserdata = $this->session->userdata('lg_result');
$this->userprofile = $this->session->userdata('user_profile');
}
public $table = 'content_types';
public $primary_key = 'id';
public $default_limit = 50;
public function default_order_by()
{
$this->db->order_by('id asc');
}
}
然后我需要在哪里调用模型
$this->modelname->save($id,array());
$this->modelname->where()->get()->row();
因此，为“视图表”创建一个，为插入表创建另一个