运行时的CodeIgniter数据库连接

时间：2011-08-30 18:45:37

标签： php database connection codeigniter-datamapper

我仍然遇到在运行时手动连接数据库的麻烦。我打开一个新问题因为还没有找到答案。

就是这样，

我使用连接用户连接到数据库，以验证使用表单输入的用户名和密码。然后使用这个新信息，如果用户有效，我必须使用这个新的用户名和密码连接到数据库。外观包含以下内容：

配置/ database.php中

    $active_record = TRUE;
    $db['default']['hostname'] = 'host';
    $db['default']['username'] = 'username';
    $db['default']['password'] = 'pwd';
    $db['default']['database'] = 'dbname';
    $db['default']['dbdriver'] = 'oci8';
    $db['default']['dbprefix'] = '';
    $db['default']['pconnect'] = FALSE;
    $db['default']['db_debug'] = TRUE;
    $db['default']['cache_on'] = FALSE;
    $db['default']['cachedir'] = '';
    $db['default']['char_set'] = 'WE8ISO8859P1';
    $db['default']['dbcollat'] = '';
    $db['default']['swap_pre'] = '';
    $db['default']['autoinit'] = FALSE;
    $db['default']['stricton'] = FALSE;

然后在登录控制器中：controllers / login.php 

public function __construct(){
    parent::__construct();
    $this->output->enable_profiler(TRUE);

    $this->CI =& get_instance();
    $this->db_con = $this->CI->load->database('default', FALSE, TRUE);

    $this->load->model('Login_model');
    session_start();

}

public function index(){                
    if (isset($_POST['ingresar'])){

        $d['data'] = $this->Login_model->Obtener_usuario($_POST['usuario']);

        $_SESSION['logueo'] = $d['data']->row();

        if (empty($_SESSION['logueo'])){
            $d['error'] = 2;
        }
        else{
            if (is_null($_SESSION['logueo']->USER_ORACLE)){
                $d['error'] = 1;
            }
            if (!is_null($_SESSION['logueo']->N_SECUENCIA)){
                cargar_var_sesion($_POST['usuario'], $_SESSION['logueo']->USER_ORACLE, $_SESSION['logueo']->N_SECUENCIA, $_SESSION['logueo']->C_USR_NOM_APE);

                $db['limited']['hostname'] = 'samehost';
                $db['limited']['username'] = $_POST['usuario'];
                $db['limited']['password'] = $_POST['clave'];
                $db['limited']['database'] = 'samedbname';
                $db['limited']['dbdriver'] = 'oci8';
                $db['limited']['dbprefix'] = '';
                $db['limited']['pconnect'] = FALSE;
                $db['limited']['db_debug'] = TRUE;
                $db['limited']['cache_on'] = FALSE;
                $db['limited']['cachedir'] = '';
                $db['limited']['char_set'] = 'WE8ISO8859P1';
                $db['limited']['dbcollat'] = '';
                $db['limited']['swap_pre'] = '';
                $db['limited']['autoinit'] = FALSE;
                $db['limited']['stricton'] = FALSE;

                $active_group = 'limited';

                $this->db = $this->CI->load->database('limited', FALSE, TRUE);                  
                redirect('inicio', 'location');
            }
            else{
                $d['error'] = 2;    
            }
        }           
    }
    else{
        $d['error'] = 0;    
    }

    $this->load->view('/componentes/header');
    $this->load->view('/componentes/menu_sin_login');
    $this->load->view('/login/login', $d);
    $this->load->view('/componentes/footer');       
}

在此控制器中一切正常但是当执行重定向（加载不同的模型）时，例如tareas_model.php我在第一行继续收到相同的错误：

模型/ tareas_model.php 

function __construct()
{
    parent::__construct();
    $query = $this->db->query('ALTER SESSION SET nls_sort = \'SPANISH\'');
}

错误是：

A PHP Error was encountered
Severity: Notice
Message: Undefined property: Inicio::$db
Filename: core/Model.php
Line Number: 50
Fatal error: Call to a member function query() on a non-object in /var/www/crm/application/models/tareas_model.php on line 8

我也尝试将$ this-＆gt; db设置为会话变量，但我一直收到同样的错误而且我开车很疯狂。我尝试过网上找到的所有东西都没有运气。

任何帮助？

2 个答案:

答案 0 :(得分：1)

那么，对于那些在这个问题下运行的人，我想我找到了解决方案。我按如下方式修改了文件：

配置/ database.php中

$active_record = TRUE;
$db['default']['hostname'] = 'localhost';
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['database'] = '';
$db['default']['dbdriver'] = 'oci8';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'WE8ISO8859P1';
$db['default']['dbcollat'] = '';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = FALSE;
$db['default']['stricton'] = FALSE;

然后，首先接收POST用户名和密码的控制器为： 控制器/ login.php中

public function __construct()
{
    parent::__construct();
    $this->output->enable_profiler(TRUE);
    session_start();

}

public function index()
{               
    if (isset($_POST['ingresar'])){

        if (!empty($_POST['usuario']) && !empty($_POST['clave'])){

            $c['hostname'] = "myhost";
            $c['username'] = strtoupper($_POST['usuario']);
            $c['password'] = $_POST['clave'];
            $c['database'] = "dbname";
            $c['dbdriver'] = "oci8";
            $c['dbprefix'] = "";
            $c['pconnect'] = TRUE;
            $c['db_debug'] = TRUE;
            $c['cache_on'] = FALSE;
            $c['cachedir'] = "";
            $c['char_set'] = "WE8ISO8859P1";
            $c['dbcollat'] = ""; 
            $active_record = TRUE;

            $_SESSION['c'] = $c;

            $this->db = $this->load->database($_SESSION['c'], TRUE, TRUE);
            $this->load->model('Login_model');

            $d['data'] = $this->Login_model->Obtener_usuario($_POST['usuario']);

            $_SESSION['logueo'] = $d['data']->row(); //print_r($_SESSION['logueo']);
            cargar_var_sesion($_SESSION['logueo']->C_USUARIO_WEB, $_SESSION['logueo']->USER_ORACLE, $_SESSION['logueo']->C_USR_NOM_APE, $this->db->conn_id, $_SESSION['c']);
            redirect('inicio', 'location');

        }
        else{
            $d['error'] = 1;

            $this->load->view('/componentes/header');
            $this->load->view('/componentes/menu_sin_login');
            $this->load->view('/login/login', $d);
            $this->load->view('/componentes/footer');
        }           
    }
    else{
        $d['error'] = 0;

        $this->load->view('/componentes/header');
        $this->load->view('/componentes/menu_sin_login');
        $this->load->view('/login/login', $d);
        $this->load->view('/componentes/footer');   
    }

}

然后，在模型中：models / login_model.php 

function __construct()
{
    parent::__construct();
    $CI =& get_instance();
}
function Obtener_usuario($usuario) 
{
    $CI =& get_instance();
    $query_logueo = $CI->db->query('SELECT....');
    return $query_logueo;
}

然后在每个控制器中我重新加载数据库，如：

public function __construct()
{
    parent::__construct();
    $this->output->enable_profiler(TRUE);

    session_start();

    $this->db = $this->load->database($_SESSION['c'], TRUE, TRUE);
    $this->load->model('Any_model');
}

轻微，每个控制器中只有少数几个，模型中没有，所以很棒！

干杯， V

答案 1 :(得分：1)

这是针对更改运行时数据库配置....似乎假设您正在从url中捕获主机名....并且根据您必须更改数据库配置...

第一GT＆; 

class yourcontrollername extends CI_Controller 

{

public function index($do='')
    {

//declare seesion or catch a url parameter's value in session

      if(isset($_GET['qual']))  //Qual is parameter name which is supplied in url
    {
       session_start();
       $_SESSION['Company'] = $_GET['qual'];


    }

public function delx($id)
    {
        session_start();
        $Scompany = $_SESSION['Company'];

    $this->load->helper('url');
    $server_url = site_url('api');

    $this->load->library('xmlrpc');

    $this->xmlrpc->server($server_url, 80);
    $this->xmlrpc->method('delx_order_delete');
    $request = array();
    $request = array("id"=>$id , "Param"=>$Scompany);


    $this->xmlrpc->request(array(array($request,'struct')));

    $this->load->library('session');

    $sess = array();

    if ( ! $this->xmlrpc->send_request()){
        $sess['err'] = $this->xmlrpc->display_error();
    }else{
        $resl = $this->xmlrpc->display_response();
        if($resl['failure'] != ''){
            $sess['err'] = $resl['failure'];
        }
        if($resl['success'] != ''){
            $sess['succ'] = $resl['success'];
            $output = $this->session->userdata('output');
            if(is_array($output)){
                foreach($output as $key=>$valo){
                    if($valo['ID'] == $id){
                        unset($output[$key]);
                    }
                }
            }
        }
        $this->session->set_userdata($sess);
        $this->session->set_userdata(array('output'=>$output));
    }


}


     }



}

现在，在Api.model上

function x_order_delete($params)
{
    $compname = $params['Param'];

    if($compname == 'xyz.con')

    {

        $c['hostname'] = $compname;
        $c['username'] = "username";
        $c['password'] = "password";
        $c['database'] = "db name";
        $c['dbdriver'] = "mysql";
        $c['dbprefix'] = "";
        $c['pconnect'] = TRUE;
        $c['db_debug'] = TRUE;
        $c['cache_on'] = FALSE;
        $c['cachedir'] = '';
        $c['char_set'] = 'utf8';
        $c['dbcollat'] = 'utf8_general_ci';
        $c['swap_pre'] = '';
        $c['autoinit'] = TRUE;
        $c['stricton'] = FALSE;

        $_SESSION['c'] = $c;


        $this->db = $this->load->database($_SESSION['c'], TRUE, TRUE);

        //$this->load->database();

    if($query = $this->db->query('DELETE FROM table
                               Where ID = '.$params['id'])){

        return array("Successfully deleted record.","");
    } else {
        return array("","Error deleting record.");
    }
    return $query;
  }
}

就是这样....我希望这会对你有所帮助....祝你好运

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