Two Table Query in Groovy script - sql

Question

How do I handle this SQL query in grails in my ProductsController script? Notice its two tables with a join on the product id.
SELECT p.*,pd.*
FROM products p, products_description pd
WHERE p.products_id=pd.products_id
ORDER BY p.products_date_added DESC
Obviously I can't do this:
def all= {
def a
a = Products.find("FROM products p, products_description pd
WHERE p.products_id=pd.products_id ORDER BY p.products_date_added DESC")
render a as JSON
}

Answer 1

If you are adamant on using a custom sql query instead of any grails dynamic finder, you can use the following code:
def session = sessionFactory.getCurrentSession() // a reference to the sessionFactory is injected in all controllers and services that have a sessionFactory variable defined
Query query = session.createSQLQuery("SELECT p.*,pd.*
FROM products p, products_description pd
WHERE p.products_id=pd.products_id
ORDER BY p.products_date_added DESC");
def result = query.list()
You will have to add a variable named sessionFactory to your controller. Something like this:
class ProductsController = {
def sessionFactory
The result list would be a list of lists. Each element of the main list would be a list of size 2 with the first element as the product and the second as the product description.

Answer 2

You can use a Many-to-one and one-to-one relation and let GORM take care of the association for you.
class Products {
ProductsDescription description
...
static mapping = {
description column: 'products_id'
}
}
You can then access the description by reference:
a = products.listOrderByProductsDateAdded(order: 'desc')
a.description.productsDescription