code:
if(isset($_POST['submit']))
{
$number = 1000;
$number++;
$unique = strval($number);
$product_id = "LTC_".$unique;
$query = "insert into stock(`product_id`)values('".$product_id."')";
//echo $query;
$result = mysqli_query($con,$query);
if($result==true)
{
$msg = "<div class='alert alert-success'>Record Save Successfully</div>";
}
else
{
$msg = "<div class='alert alert-danger'>Unable to Save Please Try Again !!!</div>";
}
}
In this code I have a variable ie $product_id
. Now what am I doing here I am insert product_id
value in a table suppose first value of product_id
is 1001
next will be 1002
. Now I want to generate a new number in a series way and If I delete any product_id
it will never ever repeat again. So, How can I do this ?
try this
$sql = mysqli_query($con,"select max(product_id) as product_id from stock");
$fet = mysqli_fetch_assoc($sql);
$ides = $fet['product_id'];
$number = 1000;
$number++;
$unique = strval($number);
if($unique==$ides || $unique!=$ides)
{
$new_id = ++$ides;
}
if(isset($_POST['submit']))
{
$product_id = $new_id;
//your custom code here
}
将$unique
数字存储在表中,然后始终从数据库中读取它,然后对其递增,制作新的$product_id
然后将$unique
的新值存储到该表中。
尝试简单地使用自动递增功能,而不应用任何唯一约束。
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