從數據庫返回帶有ajax的多行 - Codeigniter

Question

視圖：試圖根據長度，寬度和高度檢索項目。

<form method="post" action=""> 

    <label for="title">L</label> 
    <input type="text" name="length" id="length" value="" /> 
</br> 
    <label for="title">W</label> 
    <input type="text" name="width" id="width" value="" /> 
</br> 
    <label for="title">H</label> 
    <input type="text" name="height" id="height" value="" /> 

    <input type="submit" name="submit" id="submit" /> 
</form> 

js文件：

$("#submit").click(function (e) { 
event.preventDefault(); 

    var length = $('#length').val(); 
    var width = $('#width').val(); 
    var height = $('#height').val(); 

    $.ajax({ 
     url: "http://domain.com/index.php/welcome/get_items", 
     data: { 
      length: length, width: width, height: height 
     } 
    }).done(function(data) { 
     $('div#cont').text(data.content); 
    }).fail(function() { 
     alert('Failed!') 
    }); 

}); 

控制器：我不知道如何來構建這個。如果只輸入一個值，則應該查找該值，如果兩個值匹配具有兩個維度的行，並且如果全部三個都存在，則相同。我是否檢查並查看給定的值，並創建多個模型函數？

我似乎也有一個問題，下面的foreach語句。它不會返回多行。

public function get_items() 
{ 
     $this->load->model('home_model'); 

      $this->load->library('form_validation'); 
      $this->form_validation->set_rules('length', 'Length', 'trim|required|xss_clean'); 
      $this->form_validation->set_rules('width', 'Width', 'trim|required|xss_clean'); 
      $this->form_validation->set_rules('height', 'Height', 'trim|required|xss_clean'); 

      $length = $_GET['length']; 
      $width = $_GET['width']; 
      $height = $_GET['height']; 

      $one_exp = $this->home_model->one_exp($length, $width, $height); 

     if($one_exp != false){ 
       //$html = '<ul>'; 
       foreach($one_exp as $exp) { 
         $html = $exp->width . $exp->color . $exp->filename; 
       } 
       //$html .= '</ul>'; 
       $result = array('status' => 'ok', 'content' => $html); 
       header('Content-type: application/json'); 
       echo json_encode($result); 
       exit(); 
     }else{ 
       $result = array('status' => 'no', 'content' => 'nothing here'); 
       header('Content-type: application/json'); 
       echo json_encode($result); 
       exit(); 
     } 

} 

型號：以下功能僅供測試。

function one_exp($length, $width, $height) { 
     $query_str = "SELECT * FROM files WHERE length =? || width=? || height=?"; 
     $query = $this->db->query($query_str, array($length, $width, $height)); 

    if($query->num_rows() > 0) { 
     foreach($query->result() as $item) { 
      $data[] = $item; 
     } 
      return $data; 
    } else { 
      return false; 
    } 
} 

*編輯

function one_exp($length, $width, $height) { 
     //$query_str = "SELECT * FROM files WHERE length =? || width=? || height=?"; 
$query_str = "SELECT * FROM files WHERE "; 

$query_and=array(); 

    if(!empty($length)){ 
     $query_and[]= ' length =?'; 
    } 
    if(!empty($width)){ 
     $query_and[]= ' width=?'; 
    } 
    if(!empty($height)){ 
     $query_and[]= ' height=?'; 
    } 

$query_str .= implode(' AND ', $query_and); 

    $query = $this->db->query($query_str, array($length, $width, $height)); 

    if($query->num_rows() > 0) { 
     foreach($query->result() as $item) { 
      $data[] = $item; 
     } 
      return $data; 
    } else { 
      return false; 
    } 
} 

響應

Array 
(
[0] => width=? 
[1] => height=? 
) 
string(7) "Width50" 
string(8) "Height60" 
SELECT * FROM files WHERE width=''AND height='50'{"status":"no","content":"nothing here"} 

Answer 1

至於查詢轉到您可以創建基於參數的查詢字符串，喜歡的東西：

function one_exp($length, $width, $height) { 
    $query_str = "SELECT * FROM files WHERE "; 

    $query_and=array(); 
     if(!empty($length)){ 
      $query_and[]= ' length =?'; 
     } 
     if(!empty($width)){ 
      $query_and[]= ' width=?'; 
     } 
     if(!empty($height)){ 
      $query_and[]= ' height=?'; 
     } 
    $query_str .= implode(' AND ', $query_and); 
    /* do query */ 

} 

只要確保至少有一個參數有效值

Answer 2

有這部分的問題

foreach($one_exp as $exp) { 
    $html = $exp->width . $exp->color . $exp->filename; 
} 

的varriable $html每次重新初始化

所以做一個更新

foreach($one_exp as $exp) { 
    $html .= $exp->width . $exp->color . $exp->filename."<br>"; 
}