「消息：未定義的變量：查詢」加入兩個表的錯誤codeigniter mysql php

Question

我有兩個名爲'addexpense'和'addcategory'的表。 我已成功加入每個表格，但在我的查看頁面上數據未查看，並且錯誤消息在屏幕上傳遞。請幫忙。

這是我的模型

public function getExpenses(){ 
$this->db->select("addexpense.exp_date, addexpense.exp_amount, addexpense.exp_note, addexpense.exp_created, addcategory.category_name"); 
$this->db->from('addexpense'); 
$this->db->join('addcategory', 'addcategory.category_id = addexpense.category_id'); 
$query = $this->db->get(); 
return $query->result(); 
} 

這是我的控制器

public function join(){ 
    $query = $this->base_model->getExpenses(); 
    //$data['result'] = null; 
    if($query) 
    { 
     $data['query'] = $query; 
    } 
    $this->load->view('listexpense', $data); 
} 

這是我的看法代碼

<tr> 
    <td><strong>Date</strong></td> 
    <td><strong>Amount</strong></td> 
    <td><strong>Note</strong></td> 
    <td><strong>Created</strong></td> 
    <td><strong>Category Name</strong></td> 
</tr> 
<?php foreach($query as $expenses){?> 
<tr> 
    <td><?=$expenses->exp_date;?></td> 
    <td><?=$expenses->exp_amount;?></td> 
    <td><?=$expenses->exp_note;?></td> 
    <td><?=$expenses->exp_created;?></td> 
    <td><?=$expenses->category_name;?></td> 
</tr>  
<?php }?> 

Answer 1

組控制器功能這樣

public function join(){ 
     $data['query'] = $this->base_model->getExpenses(); 
     $this->load->view('listexpense', $data); 
    } 

Answer 2

請您可以檢查你的數據上查看文件會或不會被你的看法開始打印出來

<?php echo '<pre>'; 
print_r($query); 
?> 

Answer 3

好像你還沒有初始化modelcontroller。

在您的controller中，您需要先使用它的properties加載model。請檢查以下您的控制器方法。

public function join() { 
    $this->load->model('base_model'); 
    $query = $this->base_model->getExpenses(); 
    $data = array(); 
    if ($query) { 
     $data['query'] = $query; 
    } 
    $this->load->view('listexpense', $data); 
} 

讓我知道它仍然不起作用。

Answer 4

型號變更結果（）來result_array（）

public function getExpenses(){ 
    $this->db->select("addexpense.exp_date, addexpense.exp_amount, addexpense.exp_note, addexpense.exp_created, addcategory.category_name"); 
    $this->db->from('addexpense'); 
    $this->db->join('addcategory', 'addcategory.category_id = addexpense.category_id'); 
    $query = $this->db->get(); 
    return $query->result_array(); 
} 

控制器試試下面

public function join() 
{ 
    $results = $this->base_model->getExpenses(); 

    $data['expenses'] = array(); 

    foreach ($results as $result) { 
     $data['expenses'][] = array(
      'exp_date' => $result['exp_date'], 
      'exp_amount' => $result['exp_amount'], 
      'exp_note' => $result['exp_note'], 
      'exp_created' => $result['exp_created'], 
      'category_name' => $result['category_name'] 
     ); 
    } 

    $this->load->view('listexpense', $data); 

} 

查看代碼，確保是正確的觀點

<table> 
<thead> 
</thead> 
<tbody> 
<?php foreach($expenses as $expense){?> 
<tr> 
    <td><?php echo $expense['exp_date'];?></td> 
    <td><?php echo $expense['exp_amount'];?></td> 
    <td><?php echo $expense['exp_note'];?></td> 
    <td><?php echo $expense['exp_created'];?></td> 
    <td><?php echo $expense['category_name'];?></td> 
</tr>  
<?php }?> 
</tbody> 
</table> 

Answer 5

下面是代碼，請檢查並更新 型號

public function getExpenses(){ 
    $this->db->select("addexpense.exp_date, addexpense.exp_amount, addexpense.exp_note, addexpense.exp_created, addcategory.category_name"); 
    $this->db->from('addexpense'); 
    $this->db->join('addcategory', 'addcategory.category_id = addexpense.category_id'); 
    $query = $this->db->get(); 
    $query_rows = $query->num_rows(); 
    if($query_rows > 0){ 
      return $query->result(); 
    } else{ 
      return 0; 
    } 
} 

對於控制器

public function join(){ 
    $this->load->model('base_model'); 
    $query = $this->base_model->getExpenses(); 
    //print_r($query);die(); 
    $data['query'] = ''; 
    if($query != 0){ 
      $data['query'] = $query; 
    } 

    $this->load->view('listexpense', $data); 
} 

對於瀏覽

<tr> 
    <td><strong>Date</strong></td> 
    <td><strong>Amount</strong></td> 
    <td><strong>Note</strong></td> 
    <td><strong>Created</strong></td> 
    <td><strong>Category Name</strong></td> 
</tr> 
<?php 
    if($query != ''){ 
    foreach($query as $expenses){?> 
     <tr> 
     <td><?=$expenses->exp_date;?></td> 
     <td><?=$expenses->exp_amount;?></td> 
     <td><?=$expenses->exp_note;?></td> 
     <td><?=$expenses->exp_created;?></td> 
     <td><?=$expenses->category_name;?></td> 
    </tr>  
<?php } }?> 

刪除註釋 「//的print_r（$查詢）;模具（）;」並檢查模型是否正在發送數據，並請更新。