Question

我想创建一个由4位数年份和5位自动增量字段组成的学生ID编号。例如：2013-00001，当年末结束时，5位数字将重新开始为零（0）例如：2014-00001。

谢谢，Metta

Answer 1

create Table width two columns: Year,LatestNumber 

function generateStudentId(){
    $year = date("Y");
    $latestNumber = 0;
    $res = mysql_query("select * from myTable where Year=$year");
    $result = mysql_fetch_array($res);
    if($result)
        $latestNumber = $result['LatestNumber'];
    $latestNumber++;
    if($result){
        mysql_query("update myTable set LatestNumber=$latestNumber where Year=$year");
    }
    else
        mysql_query("insert into myTable values($year,$latestNumber)");

    $fiveDigitNumber = return str_pad((int) $latestNumber,5,"0",STR_PAD_LEFT);
    $studentId = $year.$fiveDigitNumber;
    return $studentId;
}

Answer 2

您可以在存储所有数据的地方使用StudentId表。

select LatestNumber from StudentIds where Year=2013 ORDER BY LatestNumber DESC LIMIT 1;

保持号码与年份分开，因此您可以通过添加虚拟年份= 2014，LatestNumber = 0来重置新年度

$LatestNumber = $result['LatestNumber'];
$LatestNumber++;

insert into StudentIds (Year, LatestNumber, ...) values (2013, $LastestNumber, ...)

在多次查询等情况下添加错误处理...

创建由当前年份编号和自动递增值组成的唯一ID

2 个答案: