Question

我想为我的应用程序创建一个简单的安装程序。我创建了一个名为＆＃34; installer＆＃34; 的库，它将检查数据库＆＃39;数据库＆＃39; =＆gt; 变量。如果未定义数据库字段，它将重定向到安装文件夹。这是我的剧本：

<?php
class Installer {
    public function __construct() {
        //get the CI instance
        $CI =& get_instance();
        $CI->load->database();


    //check if databse config set
       if ($CI->db->database == "") {
            redirect('install');
        } else {
        if (is_dir('install')) {
                echo '<i>Plese delete or rename <b>Install</b> folder</i>';
                exit;
            }
        }
    }
}

我已使用数据库和会话库

在自动加载中设置了库

$autoload['libraries'] = array('database','session','installer');

它在我的localhost上运行良好。但是当我第一次将它上传到我的网络服务器时，我得到404错误（因为控制器文件的第一个字母应该是资本），那么我已经纠正了这一点。但是当我到达我的网址http://example.com/demo（我在 public_html / demo / 目录中的文件）时，它会显示一些错误，例如

A PHP Error was encountered

Severity: Notice

Message: Uninitialized string offset: 0

Filename: mysqli/mysqli_driver.php

Line Number: 109

Backtrace:

File: /home/xxxxx/public_html/demo/application/controllers/Home.php
Line: 25
Function: __construct

File: /home/xxxxx/public_html/demo/index.php
Line: 292
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: mysqli::real_connect(): (HY000/1045): Access denied for user ''@'localhost' (using password: NO)

Filename: mysqli/mysqli_driver.php

Line Number: 161

Backtrace:

File: /home/xxxxx/public_html/demo/application/controllers/Home.php
Line: 25
Function: __construct

File: /home/xxxx/public_html/demo/index.php
Line: 292
Function: require_once


A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/demo/system/core/Exceptions.php:272)

Filename: core/Common.php

Line Number: 568

Backtrace:

File: /home/xxxxxx/public_html/demo/application/controllers/Home.php
Line: 25
Function: __construct

File: /home/xxxxxx/public_html/demo/index.php
Line: 292
Function: require_once

A Database Error Occurred

Unable to connect to your database server using the provided settings.

Filename: controllers/Home.php

Line Number: 25

当我使用localhost时它运行良好。但是当我在我的服务器上使用它时，我收到了这个错误。我的数据库配置文件：

$db['default'] = array(
    'dsn'   => '',
    'hostname' => '',
    'username' => '',
    'password' => '',
    'database' => '',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

Answer 1

错误＆＃34; mysqli :: real_connect（）:( HY000 / 1045）：拒绝用户访问＆＃39;＆＃39; localhost＆＃39; （使用密码：否）＆＃34;您已经设置了＃34;数据库＆＃34;自动加载配置中的库，未在数据库配置文件中提供数据库主机，用户名和密码。

您可以尝试删除＆＃34;数据库＆＃34;从autoload配置和检查数据库详细信息，方法是加载数据库配置并在脚本中检查其值，如下所示：

git add . 
git commit -m "changed xyz" 
git push (name of branch?)

Answer 2

请在database.php中设置实时服务器的详细信息，这不应该是空白的。

'hostname' => '',
'username' => '',
'password' => '',
'database' => '',

Answer 3

CodeIgniter有一个配置文件，可以存储数据库连接值（用户名，密码，数据库名称等）。配置文件位于application / config / database.php。您还可以通过将database.php放在相应的环境配置文件夹中来为特定环境设置数据库连接值。

因此，您需要将数据库凭据保存在该文件中以使其正常工作。

像这样：

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost', // The hostname of your database server. Often this is ‘localhost’.
    'username' => 'root', //user name of the database account
    'password' => '', // password
    'database' => 'database_name', // name of the database
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => TRUE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array()
);

请参阅他们的手册here。希望它有所帮助。

Answer 4

修改您的C:\xampp\htdocs\.. application\config\database.php

$active_group = 'default';

$query_builder = TRUE;

$db['default'] = array(

    'dsn'   => '',

    'hostname' => 'localhost',

    'username' => 'root',

    'password' => '',

    'database' => 'your_database_name',

    'dbdriver' => 'mysqli',

    'dbprefix' => '',

    'pconnect' => TRUE,

    'db_debug' => (ENVIRONMENT !== 'production'),

    'cache_on' => FALSE,

    'cachedir' => '',

    'char_set' => 'utf8',

    'dbcollat' => 'utf8_general_ci',

    'swap_pre' => '',

    'encrypt' => FALSE,

    'compress' => FALSE,

    'stricton' => FALSE,

    'failover' => array(),

    'save_queries' => TRUE

);

Codeigniter库正在使用localhost但不在Web服务器上

4 个答案: