1.

2.
$ grails create-app helloworld
$ cd helloworld
$ grails create-domain-class hello
$ vi ./grails-app/domain/helloworld/
Hello.groovy

3.
package helloworld
class Hello {
String message
static constraints = {
}
}

4.
$ grails create-controller hello
$ vi ./grails-app/controllers/
helloworld/HelloController.groovy

5.
package helloworld
class HelloController {
static scaffold = Hello
}

6.
$ grails run-app

7.

8.

9.

10.

11.

12.
grails {
exploded = true
plugins {
compile project(':core-domain-plugin')
compile project(':sub-domain-plugin')
}
}
includeFlat 'core-domain-plugin'
includeFlat 'sub-domain-plugin'

13.

14.
class IsbnUserType implements UserType {
@Override
int[] sqlTypes() {
return [StringType.INSTANCE.sqlType()]
}
@Override
Class returnedClass() {
return Isbn.class
}
}

15.
package com.example.domain
class Isbn {
private String isbnCode
}

16.
class Book {
String title
Isbn isbn
BigDecimal standardUnitPrice
static mapping = {
isbn type: IsbnUserType
}
String toString() {
title
}
}

17.
dependencies {
compile "org.springframework.boot:spring-boot-starter-logging"
compile "org.springframework.boot:spring-boot-autoconfigure"
compile "org.grails:grails-core"
compile "org.springframework.boot:spring-boot-starter-actuator"
compile "org.springframework.boot:spring-boot-starter-tomcat"
compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:1.1.1"
:
}

18.
package com.example.domain
class Isbn {
private String isbnCode
}

19.
package com.example.domain
import grails.validation.Validateable
class Book implements Validateable {
Long id
String title
Isbn isbn
BigDecimal standardUnitPrice
Long version
static constraints = {
}
}

20.
package com.example.infrastructure
import com.example.domain.Book
import org.apache.ibatis.annotations.Mapper
import org.apache.ibatis.annotations.Param
@Mapper
interface BookMapper {
void register(@Param("book") Book book)
List<Book> list()
}

21.
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.infrastructure.BookMapper">
<resultMap id="product" type="com.example.domain.Book">
<id property="id" column="id"/>
<result property=“isbn.isbnCode" column="isbn_code"/>
<result property="title" column=“title"/>
<result property="standardUnitPrice"
column=“standard_unit_price”/>
<result property="version" column="version"/>
</resultMap>
:
</mapper>

22.
package com.example
class BookRepositoryService {
List<Book> list() {
Book.findAll()
}
:
}

23.
package com.example.domain
interface BookRepository {
List<Book> list()
Book get(Long id)
}

24.
package com.example.infrastructure
import com.example.domain.Book
import com.example.domain.BookRepository
import org.springframework.stereotype.Repository
@Repository
class BookDatasource implements BookRepository {
@Override
List<Book> list() {
Book.findAll()
}
:
}

25.