Question

我一直在寻找使用CodeIgniter的多个数据库。如果我提前知道数据库是什么，那么我可以在配置文件中设置信息，然后调用我需要的任何数据库组。

但是，在我的情况下，我需要将该数据库信息存储在另一个数据库中。它是一种主数据库，包含有关客户的一般信息，包括存储客户数据的数据库和凭据。然后，该供应商可以随时添加客户，并将每个客户的数据分隔在不同的数据库中。

如何根据我在CodeIgniter中从master数据库返回的值设置数据库和凭据，还是有办法做到这一点？

有人能指出我正确的方向吗？提前感谢任何建议。

Answer 1

来自文档（https://www.codeigniter.com/user_guide/database/connecting.html）：

此函数的第一个参数可以选择用于指定您的配置文件中的特定数据库组，您甚至可以提交未在您的数据库中指定的数据库的连接值配置文件。

所以你会做这样的事情，用主数据库中的值替换值：

$config['hostname'] = "localhost";
$config['username'] = "myusername";
$config['password'] = "mypassword";
$config['database'] = "mydatabase";
$config['dbdriver'] = "mysql";
$config['dbprefix'] = "";
$config['pconnect'] = FALSE;
$config['db_debug'] = TRUE;
$config['cache_on'] = FALSE;
$config['cachedir'] = "";
$config['char_set'] = "utf8";
$config['dbcollat'] = "utf8_general_ci";

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

如果您需要保持与主数据库和客户数据库的连接，请将最后一行更改为：

$customer_db = $this->load->database($config, TRUE);

// to use the master database:
$this->db->query("SELECT * FROM my_table");

// to then use the customer database:
$customer_db->query("SELECT * FROM whatever");

Answer 2

使master成为默认数据库，使第二个数据库的客户成为 $ active_group ='default'; $ active_record = TRUE;

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

您可以通过

在控制器或模型中加载第二个数据库

$DB2 = $this->load->database('secondDatabase', TRUE);

Answer 3

/ ** config / database.php ** /

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

$db['default']['hostname'] = '';
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['dbdriver'] = '';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = (ENVIRONMENT !== 'production');
$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;

/ **您的控制器或型号** /

//by default the master database will be loaded and you can directly access db using      $this->db 
   $result = $this->db->query("SELECT * FROM `your_table`")->limit(1)->get()->result();



$config['dbxyz']['hostname'] = $result->hostname;
$config['dbxyz']['username'] = $result->username;
$config['dbxyz']['password'] = $result->password;
$config['dbxyz']['dbdriver'] = '';
$config['dbxyz']['dbprefix'] = '';
$config['dbxyz']['pconnect'] = TRUE;
$config['dbxyz']['db_debug'] = (ENVIRONMENT !== 'production');
$config['dbxyz']['cache_on'] = FALSE;
$config['dbxyz']['cachedir'] = '';
$config['dbxyz']['char_set'] = 'utf8';
$config['dbxyz']['dbcollat'] = 'utf8_general_ci';
$config['dbxyz']['swap_pre'] = '';
$config['dbxyz']['autoinit'] = TRUE;
$config['dbxyz']['stricton'] = FALSE;

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

//Set database config dynamically        
$this->config->set_item('dbxyz', $config);

//Now you can load the new database using
$this->dbxyz = $this->load->database('dbxyz');

注意：有关详细信息，请参阅Config Class Codeigniter documentation

Answer 4

在application \ config \ database.php

中添加以下行

$sql = '';
$text = file_get_contents('keywords.txt');
foreach (explode($text, PHP_EOL) as $keyword)
    $sql .= "INSERT INTO tmpText (keyword) VALUES ('$keyword'); ";
if (mysqli_multi_query($conn, $sql)) {
    echo "New records created successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
// Now run this query:
//   SELECT keyword, COUNT(description) AS Matches 
//   FROM tmpText, items 
//   WHERE  description LIKE CONCAT('%',keyword,'%')
//   GROUP BY keyword

现在我们在Controller和model中使用我们的第二个数据库，如下所示。

$db['mydb2']['hostname'] = 'localhost';
$db['mydb2']['username'] = 'root';
$db['mydb2']['password'] = '';
$db['mydb2']['database'] = 'ci2';
$db['mydb2']['dbdriver'] = 'mysql';
$db['mydb2']['dbprefix'] = '';
$db['mydb2']['pconnect'] = TRUE;
$db['mydb2']['db_debug'] = TRUE;
$db['mydb2']['cache_on'] = FALSE;
$db['mydb2']['cachedir'] = '';
$db['mydb2']['char_set'] = 'utf8';
$db['mydb2']['dbcollat'] = 'utf8_general_ci';
$db['mydb2']['swap_pre'] = '';
$db['mydb2']['autoinit'] = TRUE;
$db['mydb2']['stricton'] = FALSE;

我参考了http://www.tutsway.com/use-multiple-db-connections-in-codeigniter.php。它为我工作。

CodeIgniter：多个数据库 - 在第二个数据库中访问数据库配置

4 个答案: