Auto Insert into MySql Data Base - php

Question

When one User Enter all his/her details after enter he will get a message like his registration no /ID is Like:
A0001
2nd is
A0002
like this upto A1000
after this the registration no automaticaly change to B0001
Is It Possible!!!!!
for ($i = 'A'; $i != 'AA'; $i++)
{
$prefix = $i;
$id = $prefix.sprintf("%03s",$suffix);
for ($j=1;$j<=5;$j++)
{
$res = "$id"."$j";
echo "$res"."<br>";
}
}
this is the code only to A005 to Z005 but how can i able to pick A001 and insert into mysql database first column.

Answer 1

This is quite simple:
1st what you want to do is to query the database for the previous registration no /ID.
something like this:
$query = mysqli_query($connect,'SELECT regCode From data ORDER BY regCode DESC LIMIT 1');
then you check if there is any result like this:
$results = count(mysqli_num_rows($query));
if it $results returns 0 (it is a fresh database) do this:
$regCode = 'A0001';
else:
create an array of alphabets.
$alphabet = ['B','C','D','E']; #from B to Z (A is omitted because it is the default prefix)
retrieve previous regCode like this:
list($regCode) = mysqli_fetch_row($query);
From here seperate the alphabet from the numbers
$prefix = substr($regCode,0,1); //get prefix/alphabet
$storage_id = (int) substr($regCode,1,4) +1; //get code and add 1
Now test for the limit which in our case is 1000 (or any number you want):
$limit = 1000
if($storage_id>$limit){
$storage_id= '0001'; //if limit exceeded reset storage id
$index = array_search($prefix,$alphabet); //get alphabet/prefix index in the $alphabet array
if($index>=0){
$prefix = $alphabet[$index+1]; //Get next alphabet
}
}else{
//when limit is not exceeded do this
if(strlen($store)!=4){ //check the length of our regCode (should be 4 letters in this case if not add some zeros)
$storage_id = str_pad($storage_id,4,'0',STR_PAD_LEFT);
}
}
$regCode = $prefix.$store; //combine alphabet to new storage_id
echo $regCode;
And that's it !!!
This is the full code. Just copy this:
<?php
mysql_connect('localhost','root','');
mysql_select_db('test');
if(isset($_REQUEST['submit']))
{
$query = mysql_query('SELECT regno from details ORDER BY regno DESC LIMIT 1');
$results = mysql_num_rows($query);
if($results==0){
$regCode = 'A0001';
mysql_query("INSERT INTO details (regno) VALUES('{$regCode}')");
}else{
list($regCode) = mysql_fetch_row($query);
$alphabet = array('B','C','D','E');
$prefix = substr($regCode,0,1); //get prefix/alphabet
$storage_id = (int) substr($regCode,1,4) +1;
$limit = 1000;
if($storage_id>$limit){
$storage_id= '0001'; //if limit exceeded reset storage id
$index = array_search($prefix,$alphabet); //get alphabet/prefix index in the $alphabet array
if($index>=0){
$prefix = $alphabet[$index+1]; //Get next alphabet
}
}else{
//when limit is not exceeded do this
if(strlen($storage_id)!=4){ //check the length of our regCode (should be 4 letters in this case if not add some zeros)
$storage_id = str_pad($storage_id,4,'0',STR_PAD_LEFT);
}
}
$regCode = $prefix.$storage_id; //combine alphabet to new storage_id
mysql_query("INSERT INTO details (regno) VALUES('{$regCode}')");
}
echo $regCode;
}
?>
<form name="form" id="form" method="post">
<input type="submit" name="submit">
</form>