(Quick Reference) ### Database Mapping Usage Domain classes in Grails by default dictate the way they are mapped to the database using sensible defaults. You can customize these with the ORM Mapping DSL. For example create a `Book` domain:
    grails create-domain-class org.bookstore.Book
And then you can use the `mapping` block to customize the ORM mapping behavior.
    package org.bookstore

    class Book {
        String title
        Date releaseDate
        Author author

        static mapping = {
            table "books"
            author column: "auth_id"
        }
    }
Refer to the user guide section on ORM Mapping for more information. ### Global Database Mapping You can configure mappings globally in `grails-app/conf/runtime.groovy` as follows:
    grails.gorm.default.mapping = {
        cache true
        id generator: 'sequence'
        'user-type'(type: org.hibernate.type.YesNoType, class: Boolean)
    }
| Quick Reference (hide)