在Codeigniter中从其他DB切换动态数据库

Question

配置文件config.php为:

$active_group = 'default';
$active_record = TRUE;

db master是唯一的

$db['master']['hostname'] = "localhost";
$db['master']['username'] = "root"; 
$db['master']['password'] = ""; 
$db['master']['database'] = "admin_nb";
$db['master']['dbdriver'] = "mysqli"; 
$db['master']['dbprefix'] = ''; 
$db['master']['pconnect'] = FALSE; 
$db['master']['db_debug'] = TRUE; 
$db['master']['cache_on'] = FALSE; 
$db['master']['cachedir'] = ""; 
$db['master']['char_set'] = "utf8"; 
$db['master']['dbcollat'] = "utf8_general_ci";

db app是DYNAMIC db

$db['app']['hostname'] = 'localhost';
$db['app']['username'] = 'root';
$db['app']['password'] = '';
$db['app']['database'] = $my_bd_dynamic;
$db['app']['dbdriver'] = 'mysqli';
$db['app']['dbprefix'] = '';
$db['app']['pconnect'] = TRUE;
$db['app']['db_debug'] = TRUE;
$db['app']['cache_on'] = FALSE;
$db['app']['cachedir'] = '';
$db['app']['char_set'] = 'utf8';
$db['app']['dbcollat'] = 'utf8_general_ci';
$db['app']['swap_pre'] = '';
$db['app']['autoinit'] = TRUE;
$db['app']['stricton'] = FALSE;

根据主数据库的登录，我获得了数据库的名称，并且必须将值分配给变量美元My_bd_dynamic

"bd_dynamic's"无法手动写入，因为许多数据库

我正在测试这个在我的控制器:

class Trabajador extends CI_Controller {
public function __construct()
{
    parent::__construct();
    $this->load->driver('cache');
    $this->load->helper(array('form', 'url','otros_helper','fechas_helper','imagen_helper'));
    // Se le asigna a la informacion a la variable $user.
    $this->abbost_hotel = @$this->session->userdata('sess_abbost_hotel_'.substr(base_url(),-8,7));
        $my_bd_dynamic= $this->abbost_hotel->nombre_bd; /*var session*/
        $config_app['hostname'] = 'localhost';
        $config_app['username'] = 'root';
        $config_app['password'] = '';
        $config_app['database'] = $my_bd_dynamic;
        $config_app['dbdriver'] = 'mysqli';
        $config_app['dbprefix'] = '';
        $config_app['pconnect'] = FALSE;
        $config_app['db_debug'] = TRUE;
        $this->load->model('model_tareas','',$config_app);
}
public function index()
{
    //...
}

，我的Model_tarea是:…

 public function m_cargar_tareas_activas()
    {
        $estado = 1;
        $this->db->select("colum1,colum2");
        $this->db->from('tarea');
        $query = $this->db->get();
        return $query->result_array();
    }

…但是，读数据库master而不是读数据库$my_bd_dynamic。请帮助,没有办法这样操纵吗?

$this->set->database = $my_dinamic_bd;

我必须改变编码器核心的哪个部分来解决问题?

Answer 1

谢谢thiagobraga。但是…

public function m_cargar_tareas_activas($group_name)
{
    ...

它的参数$group_name，将不得不使用我的所有方法我的解决方案是:

database.php

$active_group = 'master';
$active_record = TRUE;
$db['master']['hostname'] = "localhost";
$db['master']['username'] = "root"; 
$db['master']['password'] = ""; 
$db['master']['database'] = "admin_nb";
$db['master']['dbdriver'] = "mysqli"; 
$db['master']['dbprefix'] = ''; 
$db['master']['pconnect'] = FALSE; 
$db['master']['db_debug'] = TRUE; 
$db['master']['cache_on'] = FALSE; 
$db['master']['cachedir'] = ""; 
$db['master']['char_set'] = "utf8"; 
$db['master']['dbcollat'] = "utf8_general_ci";

我的新文件助手:

db_dinamic_helper

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
function switch_db_dinamico($name_db)
{
    $config_app['hostname'] = 'localhost';
    $config_app['username'] = 'root';
    $config_app['password'] = '';
    $config_app['database'] = $name_db;
    $config_app['dbdriver'] = 'mysqli';
    $config_app['dbprefix'] = '';
    $config_app['pconnect'] = FALSE;
    $config_app['db_debug'] = TRUE;
    return $config_app;
}

trabajador.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Trabajador extends CI_Controller {
    public function __construct()
    {
        parent::__construct();
        $this->load->driver('cache');
        $this->load->helper(array('form', 'url','otros_helper','fechas_helper','imagen_helper','config_helper','permisos_helper'));
        $this->abbost_hotel = @$this->session->userdata('sess_abbost_hotel_'.substr(base_url(),-8,7));
        if(!@$this->abbost_hotel->usuario_id) redirect ('acceso');
            $nombre_bd = $this->abbost_hotel->nombre_bd;
            $config_app = switch_db_dinamico($nombre_bd);
            $this->load->model(array('model_producto','model_trabajadores','model_habitacion','model_tareas','model_notif'));
            $this->model_trabajadores->app_db = $this->load->database($config_app,TRUE);
            $this->model_habitacion->app_db = $this->load->database($config_app,TRUE);
            $this->model_producto->app_db = $this->load->database($config_app,TRUE);
            $this->model_tareas->app_db = $this->load->database($config_app,TRUE);
            $this->model_notif->app_db = $this->load->database($config_app,TRUE);
         date_default_timezone_set("America/Lima");
        //if(!@$this->user) redirect ('inicio/login');
        //$permisos = cargar_permisos_del_usuario($this->user->idusuario);
    }
    public function index()
    {
        //...
    }

…和我的模型:

model_tareas.php

<?php
class Model_tareas extends CI_Model {
    public $app_db;
    public function __construct()
    {
        parent::__construct();
    }
    public function m_cargar_tareas_activas()
    {
        $estado = 1;
        $this->app_db->select("tarea_id, prioridad");
        $this->app_db->from('tarea');
        $query = $this->app_db->get();
        return $query->result_array();
    }

重要的一项在autolload .php文件中初始化文件db_dinamic_helper.php谢谢. .¡¡:)

Answer 2

database.php

$active_group  = 'master';
$active_record = TRUE;
// SQL Server
$db['master']['hostname'] = "localhost";
$db['master']['username'] = "root"; 
$db['master']['password'] = ""; 
$db['master']['database'] = "admin_nb";
$db['master']['dbdriver'] = "mysqli"; 
$db['master']['dbprefix'] = ''; 
$db['master']['pconnect'] = FALSE; 
$db['master']['db_debug'] = TRUE; 
$db['master']['cache_on'] = FALSE; 
$db['master']['cachedir'] = ""; 
$db['master']['char_set'] = "utf8"; 
$db['master']['dbcollat'] = "utf8_general_ci";

trabajador.php

class Trabajador extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->driver('cache');
        $this->load->helper(array(
            'form',
            'url',
            'otros_helper',
            'fechas_helper',
            'imagen_helper'
        ));
        // Se le asigna a la informacion a la variable $user.
        $this->abbost_hotel = @$this->session->userdata(
            'sess_abbost_hotel_' . substr(base_url(), -8, 7)
        );
        $database_name = $this->abbost_hotel->nombre_bd; /*var session*/
        $config_app = array(
            'hostname' => 'localhost',
            'username' => 'root',
            'password' => '',
            'database' => $database_name,
            'dbdriver' => 'mysqli',
            'dbprefix' => '',
            'pconnect' => FALSE,
            'db_debug' => TRUE
        );
        $this->load->model('model_tareas');
        $result = Model_tareas::m_cargar_tareas_activas($config_app);
        var_dump($result);
    }
}

model_tareas.php

class Model_tareas extends CI_Model
{
    public function m_cargar_tareas_activas($group_name)
    {
        $server = $this->load->database($group_name);
        $estado = 1;
        $server->select("colum1,colum2");
        $server->from('tarea');
        $query = $server->get();
        return $query->result_array();
    }
}

查看数据库部分的CodeIgniter文档:
https://ellislab.com/codeigniter/user-guide/database/connecting.html

手动连接数据库

该函数的第一个参数可用于从配置文件中指定特定的数据库组，或者您甚至可以提交配置文件中未指定的数据库的连接值。例子:

要从配置文件中选择一个特定的组，可以这样做:

<>之前$ this ->加载->数据库("group_name");之前其中group_name是配置文件中连接组的名称。