從數據庫中獲取最大值並添加一個

Question

我有一個包含這樣的序列的表B05/FDH/CN/NM/00001，B05/FDH/CN/NM/00002 我需要獲取最大值從DB並將添加到序列。下一個數字是B05/FDH/CN/NM/00003

我如何做到這一點

SQL並即時得到最大值爲B05/FDH/CN/NM/00002

select MAX(`coverNoteNo`) as cnumber from covernotenonmotor where users_idusers = 8 

Answer 1

將結果保存成一個字符串，然後嘗試這個..

$string = 'B05/FDH/CN/NM/00002'; 

$stringpart = substr($string, 0, -5);      // "B05/FDH/CN/NM/" 
$numberpart = (integer) substr($string, -5);    // "2" 
$numberpart = $numberpart+1;        // "3" 
$numberpart = str_pad($numberpart, 5, "0", STR_PAD_LEFT); // "00003" 

echo $result = $stringpart.$numberpart;      // "B05/FDH/CN/NM/00003" 

Answer 2

如果從數據庫中，你可以獲取數據陣列也試試這個 -

假設你已經賺得即$設置ARR比你可以在一個循環中增加一個陣列結果 -

$arr = array('B05/FDH/CN/NM/00001', 'B05/FDH/CN/NM/00002'); //values from db 

     $b =array(); 
     foreach($arr as $a) 
     { 
     $str = substr($a, 0, -5); 
     $b[] .= $str.str_pad(substr($a, -5) + 1, 5, "0", STR_PAD_LEFT); 

     } 
     print_r($b); //Array ([0] = B05/FDH/CN/NM/00002 [1] = B05/FDH/CN/NM/00003) 

Answer 3

在DATABSE級別試試這個。這可以幫助你在代碼優化:)

select max(coverNoteNo), (SUBSTRING(max(coverNoteNo),0 , 15))+cast(cast((SUBSTRING(max(coverNoteNo),15 ,20)) as int)+1 as varchar) from covernotenonmotor