Question

查看：尝试根据长度，宽度和高度检索项目。

<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 file：

$("#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：我不知道如何构建它。如果只输入一个值，它应该查找它，如果它应该匹配具有两个维度的行，并且如果所有三个都存在则相同。我是否检查并查看给出了哪个值并创建多个模型函数？

我似乎也对下面的foreach声明有疑问。它不会返回多行。

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();
        }

}

型号：以下功能仅用于测试。

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;
    }
}

* 编辑

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;
    }
}

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

本节存在问题

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

每次初始化变量$html

所以进行更新

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

Answer 2

就查询而言，您可以根据参数创建查询字符串，例如：

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 */

}

确保至少有一个参数具有有效值

使用数据库中的ajax返回多行 - Codeigniter

2 个答案: