Question

我使用codeigniter 2.1.4。我将会话记录到database1，然后查询database2数据。但是会话找不到database2表。我不想将会话记录到database2。

错误消息。

A Database Error Occurred

Error Number: 1146

Table 'database2.sessions' doesn't exist

SELECT * FROM (`sessions`) WHERE `session_id` = 'fd384ac44b1fe1c073cfc23185esdfda' AND `user_agent` = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36'

Filename: libraries/Session.php

Line Number: 213

我的database.php。

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

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'root';
$db['default']['password'] = 'password';
$db['default']['database'] = 'database1';
$db['default']['dbdriver'] = 'mysql';
$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['database2']['hostname'] = 'localhost';
$db['database2']['username'] = 'root';
$db['database2']['password'] = 'password';
$db['database2']['database'] = 'database2';
$db['database2']['dbdriver'] = 'mysql';
$db['database2']['dbprefix'] = '';
$db['database2']['pconnect'] = TRUE;
$db['database2']['db_debug'] = TRUE;
$db['database2']['cache_on'] = FALSE;
$db['database2']['cachedir'] = '';
$db['database2']['char_set'] = 'utf8';
$db['database2']['dbcollat'] = 'utf8_general_ci';
$db['database2']['swap_pre'] = '';
$db['database2']['autoinit'] = FALSE;
$db['database2']['stricton'] = FALSE;

我的config.php

$config['sess_cookie_name']     = 'ci_session';
$config['sess_expiration']      = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = TRUE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']      = 'sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;

这是我的查询database2代码。

  function ip_get($ip) {
    $db_rentcar = $this->load->database('rent_car', TRUE);
    $db_rentcar->from('ip');
    $db_rentcar->where('ip_ip', $ip);
    if($db_rentcar->count_all_results() == 1) {
      $query = $db_rentcar->get_where('ip', array('ip_ip' => $ip));
      return $query->row_array();
    } else {
      return array('ip_name' => 'user1', 'ip_type' => 1);
    }
  }

我尝试将此代码添加到Session.php。

$this->CI->load->database('database1', TRUE);

错误变成了。如何解决问题？感谢。

An Error Was Encountered

You have specified an invalid database connection group.

Answer 1

您的活动数据库是您在database.php中最后定义的最后一个数据库要连接下一个，请手动连接，或者如果您总是需要连接，请将其放入My_Controller。

$this->db2 = $this->CI->load->database('db2', TRUE);

供参考，详细了解here

Answer 2

连接到多个数据库

如果您需要同时连接到多个数据库，可以按照以下步骤操作：

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

注意：更改单词＆＃34; group_one＆＃34;和＆＃34; group_two＆＃34;到您要连接的特定组名（或者您可以传递上面指出的连接值）。

通过将第二个参数设置为TRUE（布尔值），该函数将返回数据库对象。

以这种方式连接时，您将使用对象名称来发出命令，而不是本指南中使用的语法。换句话说，而不是发出命令：

$this->db->query();
$this->db->result();
etc...

您将使用：

$DB1->query();
$DB1->result();
etc...

查看官方文档https://www.codeigniter.com/userguide3/database/connecting.html#connecting-to-multiple-databases

Answer 3

我找到了答案。

function simple_query($sql)
{
    if ( ! $this->conn_id)
    {
        $this->initialize();
    }

    $this->db_select();  // Add this code

    return $this->_execute($sql);
}

参考here

codeigniter连接两个数据库

3 个答案: