Question

由于某些奇怪的原因，当我尝试加载数据库时，没有返回任何结果。

class Customer_model extends CI_Model {

    public function fetch_email_list() {
        $DB1 = $this->load->database('orders', TRUE);

        if ( $this->load->database('orders') === FALSE ){
            echo 'no database';
        }

        $results = $DB1->query("SELECT * FROM email_list");

       return $results->result_array();

   }
}

我已经检查了我的数据库配置

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

我如何解决？

Answer 1

database.php中未添加任何数据库。如果我们只有多个数据库，则使用$DB1 = $this->load->database('orders', TRUE);。

设置默认数据

$db['orders']['database'] = 'orders';

代码

public function fetch_email_list() {
    $this->load->database();

    $query = $this->db->query("SELECT * FROM email_list");
    $result = $query->result_array();
    return $result
}

Codeigniter - multiple database connections

Answer 2

您可以在模型中全局定义数据库实例，以便您可以跨方法访问它，如下所示：

class Some_model extends CI_Model {

    // Our 2nd database
    protected $DB2;

    public function __construct () {
        parent::__construct();
        $this->DB2 =  $this->load->database('orders', TRUE);
    }

    public function some_method () {
        $q = $this->DB2->query('...');
    }

    public function some_other_method () {
        $q = $this->DB2->query('...');
    }   
}

Answer 3

试试这个

$query = $this->db->get('email_list');
return $query->result_array();

Codeigniter $ this-＆gt; load-＆gt;数据库不返回结果

3 个答案: