数据库没有返回结果

Question

我最近从完美运行的 CodeIgniter v2.2.0 升级到 CodeIgniter v3.0.1 以获得更好的会话处理。这样做时，所有对数据库的调用，无论使用哪个 $database['dbdriver'] return 都没有。我也试过像这样将 $config 数组直接输入数据库加载器：$this->load->database($config); 但这也不起作用。我试过使用 PDO 和 MySQLi 驱动程序，两者 return 是一样的：

MySQLi:

string 'SELECT *
FROM `ns_users`' (length=24)
object(CI_DB_mysqli_result)[26]
  public 'conn_id' => 
    object(mysqli)[24]
      public 'affected_rows' => null
      public 'client_info' => null
      public 'client_version' => null
      public 'connect_errno' => null
      public 'connect_error' => null
      public 'errno' => null
      public 'error' => null
      public 'error_list' => null
      public 'field_count' => null
      public 'host_info' => null
      public 'info' => null
      public 'insert_id' => null
      public 'server_info' => null
      public 'server_version' => null
      public 'stat' => null
      public 'sqlstate' => null
      public 'protocol_version' => null
      public 'thread_id' => null
      public 'warning_count' => null
  public 'result_id' => 
    object(mysqli_result)[25]
      public 'current_field' => null
      public 'field_count' => null
      public 'lengths' => null
      public 'num_rows' => null
      public 'type' => null
  public 'result_array' => 
    array (size=0)
      empty
  public 'result_object' => 
    array (size=0)
      empty
  public 'custom_result_object' => 
    array (size=0)
      empty
  public 'current_row' => int 0
  public 'num_rows' => null
  public 'row_data' => null

PDO:

string 'SELECT *
FROM `ns_users`' (length=24)
object(CI_DB_pdo_result)[26]
  public 'conn_id' => 
    object(PDO)[23]
  public 'result_id' => 
    object(PDOStatement)[25]
      public 'queryString' => string 'SELECT *
FROM `ns_users`' (length=24)
  public 'result_array' => 
    array (size=0)
      empty
  public 'result_object' => 
    array (size=0)
      empty
  public 'custom_result_object' => 
    array (size=0)
      empty
  public 'current_row' => int 0
  public 'num_rows' => null
  public 'row_data' => null

我正在尝试运行的简单查询是，这样我就可以看到正在从数据库中提取数据：

SELECT * FROM `ns_users`

table绝对不是空的，它包含超过300万条登录记录，我什至尝试将限制设置为1以防records/data的数量太多.

我是否遗漏了我的配置中应该包含的任何内容？以下是我的配置（请记住，我已 CI 设置为在同一 CI 安装中处理多个应用程序）

config/database.php

<?php
$db['users'] = array(
    'dsn'      => 'mysql:host=localhost;dbname=apps_control',
    'hostname' => 'localhost',
    'username' => '***********',
    'password' => '***********',
    'database' => 'apps_control',
    'dbdriver' => 'pdo',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => TRUE,
    'failover' => array(),
    'save_queries' => TRUE
);
define('USERS_DB_GROUP', 'users');

controllers/test.php

<?php
class Test extends CI_Controller {
    public function __construct() {
        parent::__construct();
    }
    public function index(){
        $this->load->model('Users');
        var_dump($this->Users->get_all_users());
        exit;
    }
}

models/users.php

<?php
class Users extends CI_Model {

    private $table_name;
    private $udb;

    public function __construct() {
        parent::__construct();
    }
    public function init($config = null){
        if(!empty($config) && is_array($config))
            $this->udb = $this->load->database($config, TRUE);
        else
            $this->udb = $this->load->database(USERS_DB_GROUP, TRUE);
        if(!$this->table_name)
            $this->table_name = $this->udb->dbprefix('ns_users');
    }
    public function get_all_users(){
        $this->init();
        $result = $this->udb->get($this->table_name);
        var_dump($this->udb->last_query());
        var_dump($result);exit;
        if($result && $result->num_rows > 0){
            return $result->result_array();
        }
        return false;
    }
}

感谢任何帮助，我只是不知道我在这里缺少什么。

Answer 1

不确定为什么 var_dump($result) 显示您的 num_rows 0

尝试使用 num_rows()（作为函数）

比较您的结果

if($result && $result->num_rows() > 0){

但我会这样写函数

public function get_all_users()
{
    $this->init();
    $result = $this->udb->get($this->table_name)->result_array();

    if($result)//check if our array empty or not.
    {
        return $result;
    }
    return false;
}

数据库没有返回结果

Database Returning no results

php

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