SVCC Intro to Grails
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SVCC Intro to Grails - Presentation Transcript
- Introduction to Grails James Williams
- Introduction
- James Williams
- Groovy committer
- Author of Google charts plugin
- Griffon co-creator
- Creator of SwingXBuilder
- Agenda
- What is Grails?
- Domain Classes
- Controllers
- GSP/Taglibs
- Plugins
- Web Services
- Conclusion
- What is Grails?
- Rapid web application development
- Full-stack MVC framework
- Open source
- Runs on the JVM
- What is Grails? (cont'd)
- Integrates best of breed tools...
- And many more...
- Grails Quickstart
- Install Grails
- Run grails create-app <name>
- Run grails run-app
- Domain Classes
- Core objects that make up a Grails app
- Are seamlessly persisted to storage
- Can have constraints on values
- Can have relationships with other domain classes
- Constraints
- Determine the validity of member fields
- blank
- creditCard
- inList
- matches
- max
- maxSize
- min
- minSize
- notEqual
- nullable
- range
- scale
- size
- unique
- url
- validator
- Grails ORM (GORM)
- No hassle database persistence
- Leverages Hibernate but minus .hbm files and other messy configuration files
- Provides dynamic domain class methods like...
- create
- save
- delete
- update
- get
- find
- findAll
- addTo
- count
- ....
- Relationships
- One to one
- One to many (hasMany)
- Many to many
- Demo
- Domain Classes Demo
- Controllers
- Manages requests and response for domain objects
- Unless overridden, maps requests to a REST-like structure /<domain class>/action_name
- It's actions can be generated on the fly by the application
- Groovy Server Pages
- Provide views for domain objects
- Like JSP, GSPs can be a mix of markup, Groovy code and GSP tags*
- Generally correspond to an associated action in the controller
- Code fragments use the <% %> and <%= %> forms, though this is discouraged
- Typical GSP
- <html>
- <body>
- <% [1,2,3,4].each { num -> %>
- <p><%="Hello ${num}!" %></p>
- <%}%>
- </body>
- </html>
- Taglibs
- Allow the developer to simplify blocks of code
- Similar to JSP tag libs class SimpleTagLib { def emoticon = { attrs, body -> out << body() << attrs.happy == 'true' ? " :-)" : " :-(" } }
- Can be declared at an application or plugin level (e.g. Grails Chart plugin)
- Taglibs in the wild
- <html>
- <body>
- <g:emoticon happy='true'>
- </body>
- </html>
- Demo
- Controllers and GSP Demo
- Databases
- Grails supports almost all JDBC compliant databases
- grails-app/conf/Datasources.groovy allows you to specify datasources for different env's
- environments {
- development {
- dataSource {
- dbCreate = "update"
- url = "jdbc:hsqldb:mem:devDB"
- pooled = true
- driverClassName = "org.hsqldb.jdbcDriver"
- username = "sa"
- password = ""
- }
- }
- Plugins
- Grails applications in and of themselves
- Can
- provide shortcuts to core tasks
- encapsulate and integrate external tools
- Benefit from the huge library of J2EE tools and libraries
- Over 50 hosted at grails.org
- Web Services
- REST
- SOAP (requires XFire plugin) class BookService {
- static expose=['xfire']
- Book[] getBooks(){ Book.list() as Book[] }
- }
- XML Marshaling as XML
- JSON Marshaling as JSON
- Demo
- Plugins and Web services Demo
- Resources
- Websites
- grails.org
- grailspodcast.com
- groovyblogs.com
- Books
- Questions?
- Contact me
- http://jameswilliams.be/blog
- @ecspike
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