Question

現在，該公司的空位數爲3。我希望它停止在0

減去這是我的代碼：

$result4 = mysqli_query($con,"SELECT no_of_vacancy FROM job_details WHERE jobscope= 'Information Technology' AND job_title='Oak 3 Films Pte Ltd (Sales Marketing Department)';"); 

$result5 = mysqli_query($con, "SELECT COUNT(company) FROM student_details WHERE jobscope1 = 'myJobScope' AND company = 'myCompany';"); 
while ($row5 = mysqli_fetch_assoc($result5)) 
{ 
    $result6 = mysqli_query($con, "UPDATE `job_details` SET `no_of_vacancy`= `no_of_vacancy` - 2 WHERE `job_title` = 'myCompany';")); 
} 

我想從公司沒有空位的一次學生被分配給它減去一個值。

Company | Vacancy| 

ABC  | 3 

我想讓它顯示0，一旦3名學生被分配給它。現在它每次運行代碼時都會持續到-1。

Answer 1

你停止while循環中斷; 你可以用退出來阻止所有事情;

這段代碼有什麼意義？

Answer 2

要停止循環執行：

while ($row5 = mysqli_fetch_assoc($result5)) 
{ 
    $result6 = mysqli_query([...]); 
    if(condition) 
     break; 
} 

要跳過當前執行：

while ($row5 = mysqli_fetch_assoc($result5)) 
{ 
    if(condition) 
     continue; 
    $result6 = mysqli_query([...]); 
} 

Answer 3

你已經嘗試使用 「破發」？

例如，你可以使用你的代碼，以下列方式：

$result4 = mysqli_query($con,"SELECT no_of_vacancy FROM job_details WHERE jobscope= 'Information Technology' AND job_title='Oak 3 Films Pte Ltd (Sales Marketing Department)';"); 

$result5 = mysqli_query($con, "SELECT COUNT(company) FROM student_details WHERE jobscope1 = 'Information Technology' AND company = 'Oak 3 Films Pte Ltd (Sales Marketing Department)';"); 
while ($row5 = mysqli_fetch_assoc($result5)) 
{ 


$result6 = mysqli_query($con, "UPDATE `job_details` SET `no_of_vacancy`= `no_of_vacancy` - 2 WHERE `job_title` = 'Oak 3 Films Pte Ltd (Sales Marketing Department)';")); 

if ($result6 == 0) 
{ 
break; 
} 

我希望它可以幫助。