php - 总结特定学生支付的所有金额

Question

我有一个表名:

Fee_payment
payment_id  student_id  name    class_id  term         year     amount creation_timestamp
         1           7  john    JHS2A     second_term  20014    34     1416610800
         2           5  Grace   JHS2B     second_term  20014    34     1416610856
         3           6  john    JHS2A     second_term  20014    56     1416610800

如果用户点击费用记录，我想计算 john 支付的总金额。我只能获取当前支付的金额，但无法汇总学生支付的所有金额。

我正在寻找的是，如果例如 john 出现两次，我应该能够根据 term 和 creation_timestamp 将 john 支付的款项加在一起。

我尝试过的:

 <div class="box-content">
        <?php foreach($edit_data as $row):?>


        <div class="pull-left">

            <span style="font-size:20px;font-weight:100;">

            <?php echo get_phrase('payment_to');?>
            <img width="50" height="30" src="<?php echo base_url();?>uploads/logo.png" style="max-height:100px;margin:20px 0px;" />
            </span>
            <br />
            <?php echo $system_name;?>
            <br />
            <?php echo $this->db->get_where('settings' , array('type'=>'address'))->row()->description;?>
        </div>
        <div class="pull-right">
            <span style="font-size:20px;font-weight:100;">
                <?php echo get_phrase('credited_account:');?>
            </span>
            <br />
                <?php echo $this->db->get_where('student' , array('student_id'=>$row['student_id']))->row()->name;?>
            <br />
                <?php echo get_phrase('student_id');?> : 
                <?php echo "FAVECSID0000", $this->db->get_where('student' , array('student_id'=>$row['student_id']))->row()->student_id;?>
            <br />
                <?php echo get_phrase('class');?> : 
                <?php 
                $class_id   =   $this->db->get_where('student' , array('student_id'=>$row['student_id']))->row()->class_id;
                echo $this->db->get_where('class' , array('class_id'=>$class_id))->row()->name;
                ?>
        </div>
        <div style="clear:both;"></div>
        <hr />
        <table width="100%" background="http://localhost/schoolmanager/uploads/backlogos.png">
            <tr style="background-color:#7087A3; color:#fff; padding:5px;">
                <td style="padding:5px;"><?php echo get_phrase('payment_details');?></td>
                <td width="30%" style="padding:5px;">
                    <div class="pull-right">
                        <?php echo get_phrase('amount');?>
                    </div>
                </td>
            </tr>
            <tr>
                <td>
                    <span style="font-size:20px;font-weight:100;">
                        <?php echo get_phrase('payment_made');?>
                    </span>
                    <br />

                </td>
                <td width="30%" style="padding:5px;">
                    <div class="pull-right">
                        <span style="font-size:20px;font-weight:100;">
                        <?php echo "Gh", $row['amount'];?>  
                        </span>
                    </div>
                </td>
            </tr>

            <tr>

            <tr>
                <td>
                    <span style="font-size:20px;font-weight:100;">
                        <?php echo get_phrase('balance');?>
                    </span>
                    <br />
                    <?php echo $row['description'];?>
                    <?php 
                                $exams = $this->db->get_where('fee_payment', array('student_id'=>$row['student_id']))->result_array();
                                foreach($exams as $row):
                                ?>
                                <?php 

                                $ttpaid = sum($row['amount']);
                                echo $ttpaid;?>
                                 <?php
                                endforeach;
                                ?>
                </td>
                <td width="30%" style="padding:5px;">
                    <div class="pull-right">
                        <span style="font-size:20px;font-weight:100;">
                <?php 

                $tuition    =   $this->db->get_where('student' , array('student_id'=>$row['student_id']))->row()->tuition_fee;
                $status =   $this->db->get_where('student' , array('student_id'=>$row['student_id']))->row()->status_fee;
                $total_fees = $tuition + $status;
                $balance_fee = $total_fees - $row['amount'];
                echo "Gh", $balance_fee;
                ?>          
                        </span>
                    </div>
                </td>
            </tr>

            <tr>

                <td></td>
                <td width="30%" style="padding:5px;">
                    <div class="pull-right">
                    <hr />
                    <?php echo get_phrase('status');?> : <?php echo $row['status'];?>
                    <br />
                    <?php echo get_phrase('receipt_no:');?> : <?php echo "FAVECSFP0000",$row['payment_id'];?>
                    <br />
                    <?php echo get_phrase('date');?> : <?php echo date('m/d/Y', $row['creation_timestamp']);?>
                    </div>
                </td>
            </tr>
      </table>
<br />
<br />


        <?php endforeach;?>
    </div>
</div>

输出:

Payment To
FAIRVIEW EDUCATIONAL CENTER
P O BOX 126
Credited Account:
john
Student Id : FAVECSID00007
Class : JHS2A
Payment Details     
Amount
Payment Made Gh34
Balance 

Answer 1

MySQL 的好处在于它不像一张真正的纸，没有理由将自己限制在一个表上。在这种情况下，您有 Fee_payment 表，但似乎最好添加第二个表，例如 Students。

在那种情况下，您可能有一个如下所示的表格:

Students
id   name            account_created
 1   John            1416610800
 2   Grace           1416609200

所以在您的Fee_payment 表中，您不再需要存储学生的姓名。您只需使用 student_id 列来引用 Students 表中的 id 列。然后，当 John 登录时(或者有人根据 Students 表中存在的行查找 John)，您需要做的就是搜索 Fee_payment 表对于匹配 John 的 student_id。

在这种情况下，查询将类似于:

SELECT sum(amount) FROM Fee_payment WHERE student_id = 1

这将返回 John 支付的总金额，并为您提供您正在寻找的内容。