Java Reference
In-Depth Information
Listing 8.14. Initialization code in
BootStrap.groovy
class BootStrap {
def init = { servletContext ->
if (!Product.findByName('baseball')) {
Product baseball =
new Product(name:'baseball', price:5.99).save()
Product football =
new Product(name:'football', price:12.99).save()
Customer cb = new Customer(name:'Charlie Brown').save()
Order o1 = new Order(number:'1', customer:cb)
.addToOrderLines(product:baseball, quantity:2)
.addToOrderLines(product:football, quantity:1)
.save()
}
}
def destroy = {
}
}
The code in the
init
closure is executed when the application is started. The
ad-
dToOrderLines
method comes from declaring that an
Order
has many
OrderLine
instances. The
save
method first validates each object against its constraints and then
saves it to the database.
Grails uses Hibernate's ability to generate a database schema. An entity relationship dia-
gram (ERD) for the generated database is shown in
figure 8.3
.
[
12
]
12
This diagram was generated using MySQL Workbench, which is a free tool available at
www.mysql.com/
