需要在 CodeIgniter 3 中使用 MySQL table 创建图表

Question

我需要使用以下 table 创建一个动态 table。不管是来自 ChartJS 还是 Google Chart。我需要将 Y 轴的“血型”作为标签，对于 X 轴，我需要为“isAvailable”等于 1 的每种血型取行数。

Table

我试过上面的方法，它获取数据到视图但是需要为每种血型重写代码所以它不是很有效。我想知道有没有更好的方法？

控制器

public function bloodTypesChart()
    {
        $query =  $this->db->query("SELECT COUNT(PacketID) as count,(BloodType) as blood_type FROM packets WHERE (isAvailable) = '1'");

        $packetCount = $this->db->count_all_results();

        $record = $query->result();
        $chartData = [];

        foreach($record as $row) {
            $chartData['label'][] = 'O+';
            $chartData['data'][] = $packetCount;
        }
        $chartData['chart_data'] = json_encode($chartData);
        $this->load->view('insight',$chartData);
    }

Answer 1

这可能不是最有效的解决方案，但一定能帮您完成工作。

public function bloodTypesChart()
{ 
   $totalPackets = $this->db->count_all_results();
 
   $chartData = [];
   $blood_types = $this->db->query("SELECT (BloodType) as blood_type FROM packets WHERE (isAvailable) = '1' GROUP BY blood_type")
                       ->result_array();

   foreach($blood_types as $bt)
   {
      $record =  $this->db->query("SELECT COUNT(PacketID) as count FROM packets WHERE BloodType = '{$bt['blood_type']}'")
                      ->result_array();

      foreach($record as $row) {
         $chartData['label'][] = $bt['blood_type'];
         $chartData['data'][] = $row['count'];
      }
   }
$chartData['chart_data'] = json_encode($chartData);
$this->load->view('insight',$chartData);
}

推荐：您也可以尝试这样的操作

$record =  $this->db->from('packets')
                ->select('count(PacketID) count, BloodType blood_type')
                ->group_by('blood_type')
                ->get()
                ->result_array();

foreach($record as $row) {
   $chartData['label'][] = $row['blood_type'];
   $chartData['data'][] = $row['count'];
}

当然，您仍然可以使用 query() 方法并手动编写查询。

我还没有测试过这些中的任何一个，但它应该能让你知道下一步该去哪里。

Answer 2

这是一个更好、更简单的解决方案。避免使用 php 循环获取数据。

public function bloodTypesChart()
    {
        $query=" SELECT BloodType as blood_type, COUNT(PacketID) as mycount 
            FROM packets 
            WHERE isAvailable = 1 
            GROUP BY blood_type
         ";    

        $chartData = [];
        $blood_types = $this->db->query($query)->result_array();

        foreach($blood_types as $row)
        {
                $chartData['label'][] = $row['blood_type'];
                $chartData['data'][] = $row['mycount'];
        }
        $chartData['chart_data'] = json_encode($chartData);
        $this->load->view('insight',$chartData);
    }

需要在 CodeIgniter 3 中使用 MySQL table 创建图表

Need to create a chart using a MySQL table in CodeIgniter 3

php

mysql

codeigniter

codeigniter-3