Question

我正在尝试通过扩展CI_Model并根据数据库是否已定义设置正确的数据库来向我的应用程序添加单独的报告数据库。出于性能原因，报告数据库将是常规数据库的复制版本。

这是正确的方法吗？

在application / core / MY_Model中：

<?php
class MY_Model extends CI_Model
{
    function __construct()
    {
        parent::__construct();
        include APPPATH.'config/database.php';

        //If we have a reporting database load it and use it for all reporting functions
        if (isset($db['reports']))
        {
            $this->report_db = $this->load->database('reports', TRUE);  
        }
        else
        {
            $this->report_db = $this->load->database('default', TRUE);  
        }
    }

}

?>

Answer 1

您可以在代码中使用这两个数据库。您必须在config/database.php

中定义

<强> database.php中

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

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'username';
$db['default']['password'] = 'password';
$db['default']['database'] = 'database1';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

$db['reports']['hostname'] = 'localhost';
$db['reports']['username'] = 'username';
$db['reports']['password'] = 'password';
$db['reports']['database'] = 'database2';
$db['reports']['dbdriver'] = 'mysqli';
$db['reports']['dbprefix'] = '';
$db['reports']['pconnect'] = TRUE;
$db['reports']['db_debug'] = TRUE;
$db['reports']['cache_on'] = FALSE;
$db['reports']['cachedir'] = '';
$db['reports']['char_set'] = 'utf8';
$db['reports']['dbcollat'] = 'utf8_general_ci';
$db['reports']['swap_pre'] = '';
$db['reports']['autoinit'] = TRUE;
$db['reports']['stricton'] = FALSE;

<强> reports_model.php

<?php
class Reports_model extends CI_Model
{
    public function __construct()
    {
       parent::__construct();
       $this->db_reports = $this->load->database('reports', TRUE);
    }

    public function reports_list()
    {
        $this->db_reports->get('some_table');
    }
}

<强> other_model.php

<?php
class Other_model extends CI_Model
{
    public function __construct()
    {
       parent::__construct();
    }

    public function xyz()
    {
        $this->db->get('some_table');
    }
}

<强>解释

由于您已将default定义为有效群组，因此无论您在database中定义了哪些default group，都可以在模型中使用以下内容 -

$this->db->get('some_table');   // as we defined normally

你还有其他数据库，你可以拥有另一组数据库。我们在reports group中定义了它们。所以我们在_reports之后添加了额外的db -

$this->db_reports->get('some_table');

扩展CI_Model以用于报告数据库

1 个答案: