我认为这是滥用像ci这样的框架-我给你一些关于这个框架的见解-如果你愿意学习，研究这段代码，因为你几乎不使用他的任何内置功能
在我看来，您必须重新构造代码，以至于您甚至无法识别以前的尝试；）
我试着给你一个预感-但是为了理解-你必须使用这个代码
将下列模型放入“模型”文件夹中
数据库模型

class Database_model extends CI_Model
{

    private $objCollection;

    public function __construct()
    {
        $this->objCollection = new Database_Collection();
    }

    public function getCollection()
    {
        $this->benchmark->mark('code_start');
        $this->db->from('Databases');
        $this->objCollection->append($this->db->get()->result());
        $this->benchmark->mark('code_end');

        $this->objCollection->queryTime =  $this->benchmark->elapsed_time('code_start', 'code_end');

        return $this->objCollection;
    }

}

class Database_Collection extends ArrayObject
{
    public $queryTime = 0;
}

帐户模型

class Accounts_model extends CI_Model
{

    private $objCollection;

    public function __construct()
    {
        $this->objCollection = new Accounts_Collection();
    }

    public function getCollection()
    {
        $this->benchmark->mark('code_start');

        $this->db
            ->distinct()
            ->select('Username, Password, Email, FullName, IP, Phone, salt')
            ->from('Accounts');

        $this->objCollection->append($this->db->get()->result());
        $this->benchmark->mark('code_end');

        $this->objCollection->queryTime =  $this->benchmark->elapsed_time('code_start', 'code_end');

        return $this->objCollection;
    }

}

class Accounts_Collection extends ArrayObject
{
    public $queryTime = 0;
}

搜索模型

class Search_model extends CI_Model
{
    private $strSearchQuery = "";

    public function getSearchObject()
    {
        if ($this->isValidSearch())
        {
            $this->load->model("Database_Model");
            $this->load->model("Accounts_Model");

            $objSearch = new Search;

            $objDBCollection = $this->Database_Model->getCollection();

            foreach($objDBCollection AS $objItem)
            {
                $this->db
                    ->where("DatabaseID", $objItem->ID)
                    ->where($this->input->post("searchBy"), $this->strSearchQuery);

                $objItem->collection = $this->Accounts_Model->getCollection();

            }

            $objSearch->addResultCollection($objDBCollection);

            return $objSearch;
        }
        return false;
    }

    public function isValidSearch()
    {
        $strSearchQuery = $this->security->xss_clean($this->input->post('query'));
        $this->strSearchQuery = trim($strSearchQuery);
        if (empty($this->strSearchQuery))   return false;

        $arrValidSearchCriteria = array("Email", "Username", "IP", "FullName", "Phone");
        return (in_array($this->input->post("searchBy"),arrValidSearchCriteria));

    }
}

class Search
{
    public $queryTime = 0;

    private $objCollection;

    public function addResultCollection(Database_Collection $objCollection)
    {
        $this->objCollection = $objCollection;
    }

    public function getRenderedTime()
    {
        if ($this->queryTime == 0)
        {
            $this->queryTime += $this->objCollection->queryTime;

            foreach($this->objCollection AS $objItem)
            {
                if (isset($objItem->collection)
                {
                    $this->queryTime += $objItem->collection->queryTime;
                }
            }
        }

        return $this->queryTime;
    }
    public function getCountSearchResults()
    {
        if (!$this->countSearchResults)
        {
            $this->countSearchResults = 0;

            foreach($this->objCollection AS $objItem)
            {
                if (isset($objItem->collection)
                {
                    $this->countSearchResults += $objItem->collection->count();
                }
            }
        }

        return $this->countSearchResults;
    }
}

您的控制器

class Welcome extends CI_Controller 
{
    public function index() 
    {
        $this->load->model("Search_model");

        $data['title'] = "Welcome | randomsite";

        if ($this->Search_model->isValidSearch()
        {
            $objSearch = $this->Search_model->getSearchObject();
            $arrViewData = array("objSearch" => $objSearch);
            $this->load->view("list-search", $arrViewData);

        }

    }
}

ps：可能是因为我刚写了一些错字

你已经在你的代码里用过了，

$query->num_rows()

将为您提供从查询中获得的行数。