Question

I want to create a trigger, which updates a single node in my xml file. I have a table with 2 rows, where one is the id of the entry and the other one is a xml type

drop table product_information_xml;
create table product_information_xml(
information_id Number(6,0),
products XMLType);

So, now one entry looks like this

"INFORMATION_ID"    "PRODUCTS"
5                  <products>
                       <product_id>1</product_id>
                       <product_name>samsung galaxy note</product_name>
                       <product_description>mobile phone</product_description>
                       <category_id>11</category_id>
                       <weight_class>2</weight_class>
                       <warranty_period>+000000000-06</warranty_period>
                       <supplier_id>102069</supplier_id>
                       <product_status>orderable</product_status>
                  <list_price>500</list_price>
                  <min_price>400</min_price>
                  <catalog_url>www.samsung.de</catalog_url>
              </products>

So now I have another table which isn’t xml. And has all XML tags as single columns. So the columns are product_id, product_description etc.

When I update the product_id how do I update the xml node <product_id> in the xml table? Can anybody help?

What I know yet is that I start with

Create or replace trigger delete_xml
after update on product_information
for each row
begin
update ?????
end;

Now I am stuck. I would love for help!

Answer 1

If you don’t know which node you’ll update, maybe it will be easyier for you to update the whole XMLTYPE-

update product_information_xml
   set products = xmltype('<products><product_id>'||:new.product_id||'</product_id>'||
                   '<product_name>'|| :new.product_name||'</product_name>'||
                   '<product_description>'|| :new.product_description||'</product_description>'||
                   '<category_id>'|| :new.category_id||'</category_id>'||
                   '<weight_class>'|| :new.weight_class||'</weight_class>'||
                   '<warranty_period>'|| :new.warranty_period||'</warranty_period>'||
                   '<supplier_id>'|| :new.supplier_id||'</supplier_id>'||
                   '<product_status>'|| :new.product_status||'</product_status>'||
                   '<list_price>'|| :new.list_price||'</list_price>'||
                   '<min_price>'|| :new.min_price||'</min_price>'||
                   '<catalog_url>'|| :new.catalog_url||'</catalog_url></products>')
 where information_id = :new.information_id;