无法连接到数据库

无法连接到数据库

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Codeigniter：无法连接到数据库，服务器错误

本文介绍了Codeigniter：无法连接到数据库，服务器错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个codeigniter web应用程序，它在灯工作，但不工作在wamp。当我尝试访问该网站时会出现以下错误

 无法使用提供的设置连接到数据库服务器。 
 
文件名：E：\wamp\www\CI\system\database\DB_driver.php 
 
行号：114 
  
 
 
我在应用程序中使用了mysql和sqlite。
 
 
 
 php 
 
 
 
  $ active_group ='default'; 
 $ active_record = TRUE; 
 
 $ db ['login'] ['hostname'] ='localhost'; 
 $ db ['login'] ['username'] ='root'; 
 $ db ['login'] ['password'] =''; 
 $ db ['login'] ['database'] ='login'; 
 $ db ['login'] ['dbdriver'] ='mysql'; 
 $ db ['login'] ['dbprefix'] =''; 
 $ db ['login'] ['pconnect'] = TRUE; 
 $ db ['login'] ['db_debug'] = TRUE; 
 $ db ['login'] ['cache_on'] = FALSE; 
 $ db ['login'] ['cachedir'] =''; 
 $ db ['login'] ['char_set'] ='utf8'; 
 $ db ['login'] ['dbcollat​​'] ='utf8_general_ci'; 
 $ db ['login'] ['swap_pre'] =''; 
 $ db ['login'] ['autoinit'] = TRUE; 
 $ db ['login'] ['stricton'] = FALSE; 
 
 $ db ['pm'] ['hostname'] ='localhost'; 
 $ db ['pm'] ['username'] ='root'; 
 $ db ['pm'] ['password'] =''; 
 $ db ['pm'] ['database'] ='password_manager'; 
 $ db ['pm'] ['dbdriver'] ='mysql'; 
 $ db ['pm'] ['dbprefix'] =''; 
 $ db ['pm'] ['pconnect'] = TRUE; 
 $ db ['pm'] ['db_debug'] = TRUE; 
 $ db ['pm'] ['cache_on'] = FALSE; 
 $ db ['pm'] ['cachedir'] =''; 
 $ db ['pm'] ['char_set'] ='utf8'; 
 $ db ['pm'] ['dbcollat​​'] ='utf8_general_ci' 
 $ db ['pm'] ['swap_pre'] =''; 
 $ db ['pm'] ['autoinit'] = TRUE; 
 $ db ['pm'] ['stricton'] = FALSE; 
 
 $ db ['user'] ['hostname'] ='localhost'; 
 $ db ['user'] ['username'] ='root'; 
 $ db ['user'] ['password'] =''; 
 $ db ['user'] ['database'] ='user_info'; 
 $ db ['user'] ['dbdriver'] ='mysql'; 
 $ db ['user'] ['dbprefix'] =''; 
 $ db ['user'] ['pconnect'] = TRUE; 
 $ db ['user'] ['db_debug'] = TRUE; 
 $ db ['user'] ['cache_on'] = FALSE; 
 $ db ['user'] ['cachedir'] =''; 
 $ db ['user'] ['char_set'] ='utf8'; 
 $ db ['user'] ['dbcollat​​'] ='utf8_general_ci'; 
 $ db ['user'] ['swap_pre'] =''; 
 $ db ['user'] ['autoinit'] = TRUE; 
 $ db ['user'] ['stricton'] = FALSE; 
 
 $ db ['transaction'] ['hostname'] ='localhost'; 
 $ db ['transaction'] ['username'] ='root'; 
 $ db ['transaction'] ['password'] =''; 
 $ db ['transaction'] ['database'] ='user_transactions'; 
 $ db ['transaction'] ['dbdriver'] ='mysql'; 
 $ db ['transaction'] ['dbprefix'] =''; 
 $ db ['transaction'] ['pconnect'] = TRUE; 
 $ db ['transaction'] ['db_debug'] = TRUE; 
 $ db ['transaction'] ['cache_on'] = FALSE; 
 $ db ['transaction'] ['cachedir'] =''; 
 $ db ['transaction'] ['char_set'] ='utf8'; 
 $ db ['transaction'] ['dbcollat​​'] ='utf8_general_ci'; 
 $ db ['transaction'] ['swap_pre'] =''; 
 $ db ['transaction'] ['autoinit'] = TRUE; 
 $ db ['transaction'] ['stricton'] = FALSE; 
  
 
 
 
 SQLITE PDO 
 
 
 
  class CI_Appdb {
 
 var $ conDb; 
 
 public function __construct（$ userId = NULL）{
 $ this-> db（$ userId ['user_id']）; 
} 
 
 public function close（）{
 $ this-> conDb-> close（）; 
} 
 
私人函数db（$ userId）{
 if（$ userId）{
 $ this-> conDb = new PDO（sqlite：。 BASEPATH。sqlitedb /。$ userId。/app_data.db）; 
} 
} 
 
 public function query（$ query）{
 return $ this-> conDb-> query（$ query）; 
} 
 
} 
  
 
 
解决方案
您已定义 $ active_group ='default'，但您的数据库设置中没有默认组。
 
I have a codeigniter web application which is working in lamp but not working in wamp. When I try to access the site it gives the following error
 Unable to connect to your database server using the provided settings.

 Filename: E:\wamp\www\CI\system\database\DB_driver.php

 Line Number: 114

I have used mysql and sqlite in my application.
Database.php
  $active_group = 'default';
  $active_record = TRUE;

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

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

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

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

SQLITE PDO
class CI_Appdb {

    var $conDb;

    public function __construct($userId = NULL) {
        $this->db($userId['user_id']);
    }

    public function close() {
        $this->conDb->close();
    }

    private function db($userId) {
        if ($userId) {
            $this->conDb = new PDO("sqlite:" . BASEPATH . "sqlitedb/" . $userId . "/app_data.db");
        }
    }

    public function query($query) {
        return $this->conDb->query($query);
    }

}

 解决方案 
You have defined the $active_group = 'default' But there is no default group in your DB settings.
                        
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08-13 15:32
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