php - Finding Top Parent (Recursive) -


product table:

id | id_parent | margin ------------------------ 1  | null      | 10 2  | 1         | 20 3  | null      | 15 4  | 2         | 10 5  | 4         | 25

from data above, how margin total of product tree (id: 5)? doesn't have fixed depth, dynamic.

i achieve iteration php (recursive mysqli_query), consumes huge hosting memory (error 508).

here php function:

function get_margintotal($product) {     global $link;      $query = "select id_parent, margin `products` id = ".$product['id_parent'];     if (!$temp_products = mysqli_query($link, $query)) {         die(json_encode(array("errmsg" => "selecting supplier's margin.")));     }     $temp_product = mysqli_fetch_assoc($temp_products);     $temp_product['margin'] = $product['margin'] + $temp_product['margin'];      if (isset($temp_product['id_parent'])) {         return get_margintotal($temp_product);     }     else {         return $temp_product['margin'];     } }

so i'm wondering if dynamic iteration can done in mysql or how optimise function decrease server memory usage?

thank you.

mysql solution using recursion variables.

create table `finding_top_parent_recursive_46170847` (   `id` int(11) unsigned not null auto_increment,   `id_parent` int(11) default null,   `margin` int(11) default null,   primary key (`id`) ) engine=innodb auto_increment=6 default charset=utf8;   insert `finding_top_parent_recursive_46170847` (`id`, `id_parent`, `margin`) values     (1, null, 10),     (2, 1, 20),     (3, null, 15),     (4, 2, 10),     (5, 4, 25);   -- set seed leaf id set @id = 5 ; select sum(margin) margin (     -- include seed      select id, margin finding_top_parent_recursive_46170847 products     id = @id     union     -- parents     select @id := (          select id_parent          finding_top_parent_recursive_46170847 products         id = @id ) id,         ( select margin          finding_top_parent_recursive_46170847 products         id = @id ) margin          finding_top_parent_recursive_46170847 products     @id not null ) margins  -- results margin 65

ideas recursive mysql results from

https://www.google.com.au/search?q=mysql+recursive+left+join

https://dba.stackexchange.com/questions/46127/recursive-self-joins

hierarchical queries in mysql


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