Question

我的英语很难以理解，因为我试图在最后给出一个例子。请帮助我，我是这个领域的新手。谢谢你。

我的表格如下

<form method="post">
<p>Amount:
<input type="text" name="receive" />
Registration:
<input type="text" name="reg_number" />
<input type="submit" name="submit_amount" value="Submit" /></p>
</form>

当我提交此表单时，将运行以下查询

if(isset($_POST['submit_amount']) && count($_POST)!==0){

                $receive=$_POST['receive'];
                $reg_number=$_POST['reg_number'];

                $sql="INSERT INTO `installments`(month, amount, receive, fk_users_id)
SELECT now(), installment, $receive, id
  FROM users
 WHERE reg_number = '$reg_number'";
                $result=mysqli_query($con,$sql);
                if($result){
                    echo "<script>
                    alert('amount inserted');
                    </script>";
                    }else{
                        die(mysqli_error($con));
                        }
                }

当此查询运行时，它会从用户表格和表格中的接收列中的amount列中插入值

像：

installment_id |   month    | prv_arrear | amount | total | receive | arrear | fk_user_id
        1        2014-09-13                 2500               2500                1

我想根据此公式在prv_arrear，total和arrear列中插入值

式：

prv_arrear + amount = total

total - reveive = arrear

参见示例

installment_id |    month    | prv_arrear | amount | total | receive | arrear | fk_user_id
1                 2014-09-12       0         2500     2500     1600     900        1
1                 2014-09-13      900        2500     3400     1600     900        1

注意：当所有值都插入列中时，拖欠列的值应该在prv_arrear中，如上例所示。

Answer 1

这个mysql语句应该这样做。或者非常接近。


INSERT INTO `installments`(month, amount, prv_arrear, total, arrear, receive, fk_users_id)
SELECT now(), installment, installments.arrear, installment+installments.arrear, installment+installments.arrear-$receive, $receive, id
  FROM users LEFT JOIN installments ON users.id=installments.fk_users_id 
 WHERE reg_number = '$reg_number'
 ORDER BY month DESC LIMIT 1"

Answer 2

请阅读评论

<form method="post">
<p>Amount:
<input type="text" name="receive" />
Registration:
<input type="text" name="reg_number" />
<input type="submit" name="submit_amount" value="Submit" /></p>
</form>
<?php 

$con=  mysqli_connect('localhost', 'root', '', '25796596') or die(mysqli_error($con));
if(isset($_POST['submit_amount']) && count($_POST)!==0){

                $receive=$_POST['receive'];
                $reg_number=$_POST['reg_number'];

                $sel="select * from installments";
                $result=mysqli_query($con,$sel) or die(mysqli_error($con));



                while($row=  mysqli_fetch_array($result))
                {
                    $date=$row['month'];
                    $installment_id=$row['installment_id'];
                    $amount=$row['amount'];

                }
                //This will update your table

                $arrear=$amount-$receive;
                $total=$arrear+$receive;
                $update="update installments SET receive=$receive, arrear=$arrear, total=$total WHERE installment_id='$installment_id'";
                $result_number=  mysqli_query($con, $update) or die(mysqli_error($con));
               $onemore="select * from installments";
                $result=  mysqli_query($con, $onemore)or die(mysqli_error($con));

               while($row=  mysqli_fetch_array($result))
                {
                    $amount=$row['amount'];
                    $installment_id=$row['installment_id'];
                    $receive=$row['receive'];

                    $total=$row['total'];
                    $arrear=$row['arrear'];

                }

                $prv_arrear=$arrear;


                $total=$amount+$prv_arrear;
               //This will insert the value in the table.
                $insert_query="insert into `installments`(installment_id,prv_arrear,amount,total,receive,arrear)
                        VALUES
                        ('','$prv_arrear','$amount','$total','$receive','$arrear')";

                $result=  mysqli_query($con, $insert_query)or die(mysqli_error($con));




                }

使用php表单或mysql查询对行执行计算

2 个答案: