Codeigniter -多个数据库连接

wz1wpwve  于 2022-12-16  发布在  其他
关注(0)|答案(8)|浏览(146)

我必须从主数据库中检索MySQL数据库信息，然后连接到该数据库，并获取一些记录。
我的意思是，持有一个数据库，我想加载另一个数据库。
用Codeigniter可以吗？现在我在我的模型中使用下面几行代码。

function connectDb($credential)
{

    $config['hostname'] = $credential['server'];
    $config['username'] = $credential['username'];
    $config['password'] = $credential['password'];
    $config['database'] = $credential['database'];
    $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";

    $DB2=$this->load->database($config);

    $DB2->db->select('first_name,last_name');
    $query = $DB2->db->get('person');
    print_r($query);

}

不行，还有别的办法吗？

codeigniter

8条答案

按热度按时间
cgfeq70w

cgfeq70w1#

您应该在“application/config/database.php”中提供第二个数据库信息
通常，您将设置default数据库组，如下所示：

$db['default']['hostname'] = "localhost";
$db['default']['username'] = "root";
$db['default']['password'] = "";
$db['default']['database'] = "database_name";
$db['default']['dbdriver'] = "mysql";
$db['default']['dbprefix'] = "";
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = FALSE;
$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;

请注意，登录信息和设置在名为$db['default']的数组中提供。
然后，您可以在新数组中添加另一个数据库-我们将其命名为“otherdb”。

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

现在，要实际使用第二个数据库，您必须将连接发送到另一个可以在模型中使用的变量：

function my_model_method()
{
  $otherdb = $this->load->database('otherdb', TRUE); // the TRUE paramater tells CI that you'd like to return the database object.

  $query = $otherdb->select('first_name, last_name')->get('person');
  var_dump($query);
}

这样就可以了。连接多个数据库的文档可以在这里找到：http://codeigniter.com/user_guide/database/connecting.html

赞(0）分享  回复(0）举报  2022-12-16
ktca8awb

ktca8awb2#

最好的方法是使用不同的数据库组。如果你想继续使用主数据库（$this-〉db），只需关闭辅助数据库的persistent connexion配置选项。只有主数据库才能使用持久连接：
主数据库

$db['default']['hostname'] = "localhost";
$db['default']['username'] = "root";
$db['default']['password'] = "";
$db['default']['database'] = "database_name";
$db['default']['dbdriver'] = "mysql";
$db['default']['dbprefix'] = "";
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = FALSE;
$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;

辅助数据库（注意pconnect设置为false）

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

然后，您可以将辅助数据库用作数据库对象，同时照常使用主数据库：

// use master dataabse
$users = $this->db->get('users');

// connect to secondary database
$otherdb = $this->load->database('otherdb', TRUE);
$stuff = $otherdb->get('struff');
$otherdb->insert_batch('users', $users->result_array());

// keep using master database as usual, for example insert stuff from other database
$this->db->insert_batch('stuff', $stuff->result_array());
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6ie5vjzr

6ie5vjzr3#

用这个。

$dsn1 = 'mysql://user:password@localhost/db1';
$this->db1 = $this->load->database($dsn1, true);     

$dsn2 = 'mysql://user:password@localhost/db2';
$this->db2= $this->load->database($dsn2, true);     

$dsn3 = 'mysql://user:password@localhost/db3';
$this->db3= $this->load->database($dsn3, true);

用途

$this->db1 ->insert('tablename', $insert_array);
$this->db2->insert('tablename', $insert_array);
$this->db3->insert('tablename', $insert_array);
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ee7vknir

ee7vknir4#

对我来说很好用（Codeigniter 3）...

这是默认数据库：

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'mydatabase',
    '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
);

在database.php文件的底部添加另一个数据库

$db['second'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'mysecond',
    '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
);

在autoload.php配置文件中

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

默认数据库通过自动加载数据库库可以正常工作，但是第二个数据库通过使用模型和控制器中的构造函数加载和连接。

<?php
    class Seconddb_model extends CI_Model {
        function __construct(){
            parent::__construct();
            //load our second db and put in $db2
            $this->db2 = $this->load->database('second', TRUE);
        }
 
        public function getsecondUsers(){
            $query = $this->db2->get('members');
            return $query->result(); 
        }
 
    }
?>
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d8tt03nd

d8tt03nd5#

在查看代码时，我发现唯一的错误是当您尝试加载第二个数据库时：

$DB2=$this->load->database($config);

当您想要检索数据库对象时，必须在第二个参数中传递TRUE。
从Codeigniter User Guide：
通过将第二个参数设置为TRUE（布尔值），函数将返回数据库对象。
因此，您的代码应该改为：

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

这样就行了。

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6tr1vspr

6tr1vspr6#

default database
$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'test',
    '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
);
another db
$db['database2'] = array(
    'dsn' => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'test_2', // Database name
    '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
   );

在模型中你必须调用

public function getRecords(){
    // Load database
    $db2 = $this->load->database('database2', TRUE);  

   // Select records from 1st database
   $this->db->select('*');
   $query = $this->db->get('record1');
   $result1 = $query->result_array();  

// Select records from 2nd database
   $db2->select('*');
   $query = $db2->get('record2');
   $result2 = $query->result_array();
   $response = array("response1"=>$result1,"response2"=>$result2);
   return $response;
 }
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2sbarzqh

2sbarzqh7#

If you need to connect to more than one database simultaneously you can do so as follows:

$DB1 = $this->load->database('group_one', TRUE);
$DB2 = $this->load->database('group_two', TRUE);

注意：将单词“group_one”和“group_two”更改为您要连接到的特定组名称（或者您可以如上所述传递连接值）。
通过将第二个参数设置为TRUE（布尔值），函数将返回数据库对象。
请访问https://www.codeigniter.com/userguide3/database/connecting.html了解更多信息。

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jjjwad0x

jjjwad0x8#

作为对其他答案的补充，如果您想在模型本身内更改活动数据库组，从而不需要使用其他数据库连接，请在模型类内使用以下代码：

public function set_database($database)
{
    $CI =& get_instance();
    $CI->db = null;
    $this->load->database($database);
}

从控制器调用后，例如：

$this->my_model->set_database('other_db');

然后，您可以使用其他模型方法来处理新指定的数据库组，例如：

$this->my_model->insert($data);

注：目前仅使用codeigniter 3进行测试。

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