codeigniter中的多个数据库

Question

我正在尝试在 CI 中实现多个数据库。我的代码在这里：

//database.php
$active_group = "default";
$active_record = TRUE;

$db['default']['hostname'] = "localhost";
$db['default']['username'] = "root";
$db['default']['password'] = "root";
$db['default']['database'] = "ravelex";
$db['default']['dbdriver'] = "mysql";
$db['default']['dbprefix'] = "rvx_";
$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['smf']['hostname'] = "localhost";
$db['smf']['username'] = "root";
$db['smf']['password'] = "root";
$db['smf']['database'] = "smf";
$db['smf']['dbdriver'] = "mysql";
$db['smf']['dbprefix'] = "smf_";
$db['smf']['pconnect'] = TRUE;
$db['smf']['db_debug'] = TRUE;
$db['smf']['cache_on'] = FALSE;
$db['smf']['cachedir'] = "";
$db['smf']['char_set'] = "utf8";
$db['smf']['dbcollat'] = "utf8_general_ci";

模型是

//user_model.php
class user_model extends Model {
    private $ravelex_db;
    function user_model() {
        parent::Model();
        $this->ravelex_db = $this->load->database('default', TRUE);
    }

    function find_all() {
        print_r($this->ravelex_db);
        $q = $this->ravelex_db->get('users');
        return $q->result();
    }
}

//smf_user_model.php
class smf_user_model extends Model {
    private $smf_db;

    function smf_user_model() {
        parent::Model();
        $this->smf_db = $this->load->database('smf', TRUE);
    }

    function find_all() {
        $q = $this->smf_db->get('members');
        return $q->result();
    }
}

控制器测试员

    class mutipledb extends Controller {

    function mutipledb() {
        parent::Controller();
        $this->load->database();
        $this->load->model('user_model');
        $this->load->model('smf_user_model');
    }

    function index() {
        print_r($this->user_model->find_all());
        print_r($this->smf_user_model->find_all());
    }
}

有一些错误，第一个数据库使用第二个数据库名称。但它仍然使用它的前缀。

错误是

A Database Error Occurred
Error Number: 1146
Table 'smf.rvx_users' doesn't exist
SELECT * FROM (`rvx_users`)

Answer 1

在控制器测试器文件中，请注释以下行： $this->load->database();

解决问题

Answer 2

codeigniter 中有一个错误。在类中插入一行将解决整个问题。以下是原文出处：http://koorb.wordpress.com/2007/11/16/codeigniter-connect-to-multiple-databases/

这是一个副本，以防万一该网站出现故障。

行号已更改。这是来自 codeigniter 的错误修复：

----- 开始修正错误-----

说明

所有数据库调用都转到同一个数据库（最后一个已初始化）

要解决这个问题，请更改 /system/database/DB_driver.php 中的 simple_query 函数：

function simple_query($sql)
{
    if ( ! $this->conn_id)
    {
        $this->initialize();
    }

    $this->db_select(); //<-----------------  Added this line
    return $this->_execute($sql);
}

--- 结束修正 ----

这完全解决了问题，所以你可以在模型中做这样的事情

$this->legacy_db = $this->load->database('legacy', true);