Ruby on Rails. für Java Entwickler - Ende der Schmerzen - first, last = :mariano, :kamp = #{first}.#{last}@de.ibm.com
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- Ferdinand Weaver
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1 Ruby on Rails für Java Entwickler - Ende der Schmerzen - first, last = :mariano, :kamp = #{first.#{[email protected]
2 Ruby on Rails für Java Entwickler - Ende der Schmerzen - first, last = :mariano, :kamp = #{first.#{[email protected]
3 Es war einmal
4 Vor langer Zeit
5 1993
6 In einem fernen Land
7
8 Ein Ritter in schimmernder Rüstung
9
10
11 Yukihiro Matsumoto
12 Yukihiro Matsumoto Matz
13 Suche nach dem Edelstein
14 Ruby!
15 Smalltalk Perl + ~= Ruby
16 Smalltalk Perl objektorientierung + dynamik ~= Ruby
17 Smalltalk Perl objektorientierung dynamik + reguläre ausdrücke string manipulationen ~= Ruby
18 was ist ruby?
19 programmiersprache
20 for first
21 for human beings first
22 then computers Matz
23 objektorientiert
24 objektorientierung kapselung vererbung polymorphie
25 objektorientierung
26 objektorientierung everything is an object
27 objektorientierung ja, ja...
28 objektorientierung nein, diesmal wirklich!
29 objektorientierung >> "ruby".class => String
30 objektorientierung >> "ruby".class IRB-In => String
31 objektorientierung >> "ruby".class => String IRB-Out
32 objektorientierung >> 10.class => Fixnum
33 objektorientierung >> 10.class => Fixnum Java Primitives sind keine Objekte!
34 objektorientierung >> nil.class => NilClass
35 objektorientierung >> nil.class => NilClass Java Schlüsselwort null
36 objektorientierung >> true.class => TrueClass
37 objektorientierung >> true.class => TrueClass Java Schlüsselwort true
38 objektorientierung objekte senden und empfangen nachrichten
39 objektorientierung >> 10.div(2) => 5
40 objektorientierung >> 10.div(2) => 5 Java Nicht für Primitives
41 objektorientierung >> 10.send(:div, 2) => 5
42 objektorientierung >> 10./2 => 5
43 objektorientierung >> 10/2 => 5
44 objektorientierung >> 10/2 => 5 Java Nur für Primitives
45 objektorientierung >> 10.send(:/, 2) => 5
46 objektorientierung >> String.new "ruby" => "ruby"
47 objektorientierung >> String.new "ruby" => "ruby" Java Schlüsselwort new
48 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil
49 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil
50 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil
51 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil Define a setter
52 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil Define a getter
53 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil >> d = Dog.new => #<Dog:0x1d4bac> >> d.name="fluffy" => "Fluffy" >> d.name => "Fluffy"
54 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil >> d = Dog.new => #<Dog:0x1d4bac> >> d.name="fluffy" => "Fluffy" >> d.name => "Fluffy" Dog d = new Dog()
55 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil >> d = Dog.new => #<Dog:0x1d4bac> >> d.name="fluffy" => "Fluffy" >> d.name => "Fluffy" d.setname( Fluffy )
56 objektorientierung >> class Dog >> def name=(new_name) >> end >> def name >> end >> end => nil >> d = Dog.new => #<Dog:0x1d4bac> >> d.name="fluffy" => "Fluffy" >> d.name => "Fluffy" d.getname()
57 dynamisch
58 dynamik
59 dynamik everything is open
60 dynamik sogar die ruby libraries
61 dynamik >> class Fixnum >> def even? >> self % 2 == 0 >> end >> end => nil >> 10.even? => true >> 9.even? => false
62 dynamik >> class Fixnum >> def even? >> self % 2 == 0 >> end >> end => nil >> 10.even? => true >> 9.even? => false Java Subclassing, wenn erlaubt Helper Klassen -> StringUtil
63 dynamik und bereits lebende objekte
64 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
65 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
66 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
67 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
68 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
69 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
70 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end
71 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end >> Player.find(:all).size => 4
72 dynamik class << ActiveRecord::Base.connection alias : old_execute :execute def execute(statement, name) puts "Executing: #{statement" old_execute (statement, name) end end >> Player.find(:all).size Executing: SELECT * FROM players => 4
73 dynamik
74 dynamik weak typing
75 dynamik strong/static typing weak typing
76 dynamik strong/static typing dynamic typing weak typing
77 dynamik dynamic typing >> def sum(a, b) >> a+b >> end => nil
78 dynamik dynamic typing >> def sum(a, b) >> a+b >> end => nil >> sum(1,2) => 3
79 dynamik dynamic typing >> def sum(a, b) >> a+b >> end => nil >> sum("a","z") => "AZ"
80 dynamik dynamic typing >> def sum(a, b) >> a+b >> end => nil >> sum("a",2)
81 dynamik dynamic typing >> def sum(a, b) >> a+b >> end => nil >> sum("a",2) TypeError: can't convert Fixnum into String
82 dynamik :method_missing
83 dynamik >> class Receiver >> def method_missing(action, *args) >> puts "My method #{action was called," >> puts "with parameters: #{args.inspect" >> end >> end
84 dynamik >> class Receiver >> def method_missing(action, *args) >> puts "My method #{action was called," >> puts "with parameters: #{args.inspect" >> end >> end >> r = Receiver.new => #<Receiver:0x33d43c>
85 dynamik >> class Receiver >> def method_missing(action, *args) >> puts "My method #{action was called," >> puts "with parameters: #{args.inspect" >> end >> end >> r = Receiver.new => #<Receiver:0x33d43c> >> r.test My method test was called, with parameters: [] => nil
86 dynamik >> class Receiver >> def method_missing(action, *args) >> puts "My method #{action was called," >> puts "with parameters: #{args.inspect" >> end >> end >> r = Receiver.new => #<Receiver:0x33d43c> >> r.test My method test was called, with parameters: [] => nil >> r.add 1,"b", 2 My method add was called, with parameters: [1, "b", 2] => nil
87 dynamik >> class Receiver >> def method_missing(action, *args) >> puts "My method #{action was called," >> puts "with parameters: #{args.inspect" >> end >> end >> r = Receiver.new => #<Receiver:0x33d43c> >> r.test My method test was called, with parameters: [] => nil >> r.add 1,"b", 2 My method add was called, with parameters: [1, "b", 2] => nil Proxy? Mock? State Machine? CSV Reader? AOP?
88 dynamik meta programmierung
89 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil
90 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil Definiert on the fly : :name, :name=, :age, :age=
91 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil Überschreibt den setter für age.
92 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil >> d = Dog.new => #<Dog:0x318498>
93 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil >> d.name = "Fluffy" => "Fluffy" >> d.age = 2 => 2
94 dynamik >> class Dog >> attr_accessor :name, :age >> def age=(new_age) >> end >> end => nil >> d.age => 14
95 dynamik und vieles mehr...
96 blocks/closures (nur ganz kurz)
97 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end
98 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end
99 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2
100 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2
101 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2
102 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2
103 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2
104 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2 >> log("output"){puts "Chunky Bacon" Now executing Output. Chunky Bacon Done with Output. => nil
105 closures >> def log(name) >> puts "Now executing #{name." >> result = yield >> puts "Done with #{name." >> result >> end >> log("addition"){1+1 Now executing Addition. Done with Addition. => 2 >> log("output"){puts "Chunky Bacon" Now executing Output. Chunky Bacon Done with Output. => nil >> ["chunky","bacon"].each { element puts element chunky bacon
106 demo!
107 2000
108 Dave Thomas
109 Andy Hunt
110 Pragmatic Programmers
111 Pragmatic Programmers
112 Pragmatic Programmers "Learn at least one new [programming] language every year. Different languages solve the same problems in different ways. By learning several different approaches, you can help broaden your thinking and avoid getting stuck in a rut."
113 Pickaxe
114 Google Trends
115 Programming Language Trends
116 Script Kiddies...
117 ... Ritter...
118 Kent Beck
119 Kent Beck
120 Kent Beck
121 Kent Beck
122 Kent Beck I always knew one day Smalltalk would replace Java. I just didn't know it would be called Ruby.
123 Martin Fowler
124 Martin Fowler
125 Martin Fowler
126 Martin Fowler
127 Martin Fowler I like the ruby language for its rich yet uncluttered syntax and the well designed frameworks that come with it.
128 was ist nun Rails?
129 2004
130 der geistige vater
131
132 Google/O Reilly: Best Hacker
133 Google/O Reilly: Best Hacker
134 David Heinemeier Hanson (DHH)
135 rails ist...
136 mvc framwork
137 aus einem guss
138 extrahiert aus laufender anwendung
139 conventions configuration
140 conventions over configuration
141 opinionated software
142 zuckerbrot & peitsche
143 DRY (don t repeat yourself) drücke alles nur einmal aus
144 elegant
145 conventions
146 conventions Klassen- und Tabellen
147 conventions Klassen- und Tabellen Klassennamen sind Singular. Tabellennamen sind Plural.
148 conventions Klassen- und Tabellen Klassennamen sind Singular. Tabellennamen sind Plural. Klassennamen sind CamelCase. Tabellennamen sind Kleinbuchstaben, verbunden durch _.
149 conventions Klassen- und Tabellen Klassennamen sind Singular. Tabellennamen sind Plural. Klassennamen sind CamelCase. Tabellennamen sind Kleinbuchstaben, verbunden durch _. Bsp.: TurnState => turn_states OrderReceipt => order_receipts Person => people
150 conventions Spalten- und Attribute Spaltenname == Attributname Jede Tabelle hat eine id -Spalte
151 conventions Relationen Spaltennamen des foreign keys entspricht dem Namen der Klasse plus _id.
152 conventions Relationen Spaltennamen des foreign keys entspricht dem Namen der Klasse plus _id. Customer id name * Book id name author
153 conventions Relationen Spaltennamen des foreign keys entspricht dem Namen der Klasse plus _id. Customer id name * Book id name author Der Tabelle books wird die Spalte customer_id angefügt.
154 conventions... und mehr...
155 und? bringt s was?
156 JEE vs Rails
157 JEE vs Rails Java Beispielcode von Sebastian Hennebrueder id Customer name * Book id name author
158 /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import java.util.set; JEE vs Rails import javax.persistence.cascadetype; import javax.persistence.entity; import javax.persistence.fetchtype; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.onetomany; import javax.persistence.sequencegenerator; import javax.persistence.table; /** hennebrueder @SequenceGenerator(name="customer_sequence", sequencename="customer_id_seq") public class Customer { private Integer id; private String name; Customer id name private List books =new ArrayList(); public Customer(){ super(); public Customer(Integer id, String name){ super(); this.id=id; fetch = FetchType.EAGER, mappedby="customer", targetentity=book.class) public List getbooks() { return books; public void setbooks(list books) { this.books generator="customer_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String getname() { return name; public void setname(string name) { this.name = public String tostring() { return "Customer: " + getid() + " Name " + getname();
159 Model [..] public class Customer { Customer id name [..] Rails: class Customer < ActiveRecord::Base end Convention: Class Name = Customer => Table Name = Customers sonst: set_table_name( customer )
160 Primary Key sequencename="customer_id_seq") public class Customer { [..] Customer generator="customer_sequence") public Integer getid() { Rails: Entfällt. Convention: Primary Key => id, sequence
161 fetch = FetchType.EAGER, mappedby="customer", targetentity=book.class) public List getbooks() { return books; Customer id name public void setbooks(list books) { this.books = books; Rails: has_many :books Convention: targetentity = Singular des Entitätennames, sonst, :class_name = Book Getter/Setter dynamisch
162 Attributes private Integer id; private String name; private List books =new ArrayList(); public Customer(){ super(); public Customer(Integer id, String name){ super(); this.id=id; this.name=name; public Integer getid() { return id; public void setid(integer id) { this.id = id; public String getname() { return name; public void setname(string name) { this.name = name; Customer id name Rails: create_table :customers do t # keine id spalte t.column :name, :string end Convention: Name der Spalte = Name des Attributs Getter und Setter dynamisch
163 public String tostring() { return "Customer: "+getid()+" Name "+getname(); Customer id name Rails: Entfällt, Default: Duck", "id"=>"1"> Alternativ: def to_s Customer: #{id Name #{name end => "Customer: 1 Name Donald Duck"
164 CustomerDAO, CustomerDAOImpl save/persist merge findall findbyid findbycustomer (BookDAO...) Customer id name Book id name author Rails: Alle Methoden bereits im Framework generisch enthalten findbyx dynamisch -> findbyname, findbyauthor, findbycustomer, findbytitleandauthor...
165 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
166 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
167 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
168 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
169 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
170 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
171 Migration Customer id name * Book id name author class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end
172 Der Code Customer id name * Book id name author class Customer < ActiveRecord::Base end has_many :books class Book < ActiveRecord::Base end belongs_to :customer
173 Perfection in Design This Wikipedia and Wikimedia Commons image is from the user Chris 73 and is freely available at wiki/image:antoine_de_saint-exup%c3%a9ry_lyon.jpg under the creative commons cc-by-sa 2.5 license.
174 Perfection in Design Antoine de Saint-Exupéry This Wikipedia and Wikimedia Commons image is from the user Chris 73 and is freely available at wiki/image:antoine_de_saint-exup%c3%a9ry_lyon.jpg under the creative commons cc-by-sa 2.5 license.
175 Perfection in Design You know you ve achieved perfection in design, not when you have nothing more to add, but when you have nothing more to take away. Antoine de Saint-Exupéry This Wikipedia and Wikimedia Commons image is from the user Chris 73 and is freely available at wiki/image:antoine_de_saint-exup%c3%a9ry_lyon.jpg under the creative commons cc-by-sa 2.5 license.
176 JEE vs Rails Migration Customer Book
177 /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import java.util.set; import javax.persistence.cascadetype; import javax.persistence.entity; import javax.persistence.fetchtype; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.onetomany; import javax.persistence.sequencegenerator; import javax.persistence.table; /** hennebrueder @SequenceGenerator(name="customer_sequence", sequencename="customer_id_seq") public class Customer { private Integer id; private String name; private List books =new ArrayList(); public Customer(){ super(); public Customer(Integer id, String name){ super(); this.id=id; fetch = FetchType.EAGER, mappedby="customer", targetentity=book.class) public List getbooks() { return books; public void setbooks(list books) { this.books generator="customer_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String getname() { return name; public void setname(string name) { this.name = public String tostring() { return "Customer: " + getid() + " Name " + getname(); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.stateless; import javax.persistence.entity; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; /** hennebrueder * public class CustomerDaoImp implements CustomerDao private EntityManager em; public static final String RemoteJNDIName = CustomerDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = CustomerDaoImp.class.getSimpleName() + "/local"; /* (non-javadoc) de.laliluna.example.ejb.customerdao#save(de.laliluna.example.ejb.book) */ public void save(customer customer) { em.persist(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#reattach(de.laliluna.example.ejb.book) */ public void merge(customer customer) { em.merge(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findall() */ public List findall() { return em.createquery("from Customer").getResultList(); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findbyid(java.lang.integer) */ public Customer findbyid(integer id) { Customer customer = em.find(customer.class, id); return customer; /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import javax.ejb.stateful; import javax.ejb.stateless; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import org.apache.log4j.logger; import sun.security.krb5.internal.crypto.bo; /** hennebrueder * public class BookDaoImp implements BookDao private EntityManager em; private Logger log = Logger.getLogger(this.getClass()); /* * (non-javadoc) * de.laliluna.example.ejb.bookdao#save(de.laliluna.example.ejb.book) */ public void save(book book) { log.debug("persist book: " + book); em.persist(book); public void merge(book book) { em.merge(book); public List findall() { log.debug("find All books"); return em.createquery("from Book").getResultList(); public static final String RemoteJNDIName = BookDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = BookDaoImp.class.getSimpleName() + "/local"; public Book findbyid(integer id) { return em.find(book.class, id); public List findbycustomer(customer customer) { log.debug("find by customer"); return em.createquery("from Book b where b.customer = :customer").setparameter("customer", customer).getresultlist(); package de.laliluna.library; import java.util.list; import javax.ejb.local; import public interface BookDao { public void save(book book); public void merge(book book); public List findall(); public List findbycustomer(customer customer); public Book findbyid(integer id); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.local; /** hennebrueder * public interface CustomerDao { public void save(customer customer); public void merge(customer customer); public List findall(); public Customer findbyid(integer id); /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.io.serializable; import javax.persistence.entity; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.joincolumn; import javax.persistence.manytoone; import javax.persistence.sequencegenerator; import javax.persistence.table; import org.hibernate.annotations.genericgenerator; /** hennebrueder = = "book_sequence", sequencename = "book_id_seq") public class Book implements Serializable { private Integer id; private String title; private String author; private Customer customer; public Book() { super(); public Book(Integer id, String title, String author) { super(); this.id = id; this.title = title; this.author = "customer_id") public Customer getcustomer() { return customer; public void setcustomer(customer customer) { this.customer = customer; public String getauthor() { return author; public void setauthor(string author) { this.author = GenerationType.SEQUENCE, generator = "book_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String gettitle() { return title; public void settitle(string title) { this.title = public String tostring() { return "Book: " + getid() + " Title " + gettitle() + " Author " + getauthor(); JEE vs Rails Migration Customer Book
178 /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import java.util.set; import javax.persistence.cascadetype; import javax.persistence.entity; import javax.persistence.fetchtype; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.onetomany; import javax.persistence.sequencegenerator; import javax.persistence.table; /** hennebrueder @SequenceGenerator(name="customer_sequence", sequencename="customer_id_seq") public class Customer { private Integer id; private String name; private List books =new ArrayList(); public Customer(){ super(); public Customer(Integer id, String name){ super(); this.id=id; fetch = FetchType.EAGER, mappedby="customer", targetentity=book.class) public List getbooks() { return books; public void setbooks(list books) { this.books generator="customer_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String getname() { return name; public void setname(string name) { this.name = public String tostring() { return "Customer: " + getid() + " Name " + getname(); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.stateless; import javax.persistence.entity; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; /** hennebrueder * public class CustomerDaoImp implements CustomerDao private EntityManager em; public static final String RemoteJNDIName = CustomerDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = CustomerDaoImp.class.getSimpleName() + "/local"; /* (non-javadoc) de.laliluna.example.ejb.customerdao#save(de.laliluna.example.ejb.book) */ public void save(customer customer) { em.persist(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#reattach(de.laliluna.example.ejb.book) */ public void merge(customer customer) { em.merge(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findall() */ public List findall() { return em.createquery("from Customer").getResultList(); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findbyid(java.lang.integer) */ public Customer findbyid(integer id) { Customer customer = em.find(customer.class, id); return customer; /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import javax.ejb.stateful; import javax.ejb.stateless; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import org.apache.log4j.logger; import sun.security.krb5.internal.crypto.bo; /** hennebrueder * public class BookDaoImp implements BookDao private EntityManager em; private Logger log = Logger.getLogger(this.getClass()); /* * (non-javadoc) * de.laliluna.example.ejb.bookdao#save(de.laliluna.example.ejb.book) */ public void save(book book) { log.debug("persist book: " + book); em.persist(book); public void merge(book book) { em.merge(book); public List findall() { log.debug("find All books"); return em.createquery("from Book").getResultList(); public static final String RemoteJNDIName = BookDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = BookDaoImp.class.getSimpleName() + "/local"; public Book findbyid(integer id) { return em.find(book.class, id); public List findbycustomer(customer customer) { log.debug("find by customer"); return em.createquery("from Book b where b.customer = :customer").setparameter("customer", customer).getresultlist(); package de.laliluna.library; import java.util.list; import javax.ejb.local; import public interface BookDao { public void save(book book); public void merge(book book); public List findall(); public List findbycustomer(customer customer); public Book findbyid(integer id); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.local; /** hennebrueder * public interface CustomerDao { public void save(customer customer); public void merge(customer customer); public List findall(); public Customer findbyid(integer id); /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.io.serializable; import javax.persistence.entity; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.joincolumn; import javax.persistence.manytoone; import javax.persistence.sequencegenerator; import javax.persistence.table; import org.hibernate.annotations.genericgenerator; /** hennebrueder = = "book_sequence", sequencename = "book_id_seq") public class Book implements Serializable { private Integer id; private String title; private String author; private Customer customer; public Book() { super(); public Book(Integer id, String title, String author) { super(); this.id = id; this.title = title; this.author = "customer_id") public Customer getcustomer() { return customer; public void setcustomer(customer customer) { this.customer = customer; public String getauthor() { return author; public void setauthor(string author) { this.author = GenerationType.SEQUENCE, generator = "book_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String gettitle() { return title; public void settitle(string title) { this.title = public String tostring() { return "Book: " + getid() + " Title " + gettitle() + " Author " + getauthor(); class Customer < ActiveRecord::Base has_many :books end class Book < ActiveRecord::Base belongs_to :customer end class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end JEE vs Rails Migration Customer Book
179 /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import java.util.set; import javax.persistence.cascadetype; import javax.persistence.entity; import javax.persistence.fetchtype; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.onetomany; import javax.persistence.sequencegenerator; import javax.persistence.table; /** hennebrueder @SequenceGenerator(name="customer_sequence", sequencename="customer_id_seq") public class Customer { private Integer id; private String name; private List books =new ArrayList(); public Customer(){ super(); public Customer(Integer id, String name){ super(); this.id=id; fetch = FetchType.EAGER, mappedby="customer", targetentity=book.class) public List getbooks() { return books; public void setbooks(list books) { this.books generator="customer_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String getname() { return name; public void setname(string name) { this.name = public String tostring() { return "Customer: " + getid() + " Name " + getname(); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.stateless; import javax.persistence.entity; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; /** hennebrueder * public class CustomerDaoImp implements CustomerDao private EntityManager em; public static final String RemoteJNDIName = CustomerDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = CustomerDaoImp.class.getSimpleName() + "/local"; /* (non-javadoc) de.laliluna.example.ejb.customerdao#save(de.laliluna.example.ejb.book) */ public void save(customer customer) { em.persist(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#reattach(de.laliluna.example.ejb.book) */ public void merge(customer customer) { em.merge(customer); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findall() */ public List findall() { return em.createquery("from Customer").getResultList(); /* (non-javadoc) de.laliluna.example.ejb.customerdao#findbyid(java.lang.integer) */ public Customer findbyid(integer id) { Customer customer = em.find(customer.class, id); return customer; /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.arraylist; import java.util.list; import javax.ejb.stateful; import javax.ejb.stateless; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import org.apache.log4j.logger; import sun.security.krb5.internal.crypto.bo; /** hennebrueder * public class BookDaoImp implements BookDao private EntityManager em; private Logger log = Logger.getLogger(this.getClass()); /* * (non-javadoc) * de.laliluna.example.ejb.bookdao#save(de.laliluna.example.ejb.book) */ public void save(book book) { log.debug("persist book: " + book); em.persist(book); public void merge(book book) { em.merge(book); public List findall() { log.debug("find All books"); return em.createquery("from Book").getResultList(); public static final String RemoteJNDIName = BookDaoImp.class.getSimpleName() + "/remote"; public static final String LocalJNDIName = BookDaoImp.class.getSimpleName() + "/local"; public Book findbyid(integer id) { return em.find(book.class, id); public List findbycustomer(customer customer) { log.debug("find by customer"); return em.createquery("from Book b where b.customer = :customer").setparameter("customer", customer).getresultlist(); package de.laliluna.library; import java.util.list; import javax.ejb.local; import public interface BookDao { public void save(book book); public void merge(book book); public List findall(); public List findbycustomer(customer customer); public Book findbyid(integer id); /** * Sebastian Hennebrueder * created Mar 15, 2006 * copyright 2006 by */ package de.laliluna.library; import java.util.list; import javax.ejb.local; /** hennebrueder * public interface CustomerDao { public void save(customer customer); public void merge(customer customer); public List findall(); public Customer findbyid(integer id); /** * Sebastian Hennebrueder * created Feb 27, 2006 * copyright 2006 by */ package de.laliluna.library; import java.io.serializable; import javax.persistence.entity; import javax.persistence.generatedvalue; import javax.persistence.generationtype; import javax.persistence.id; import javax.persistence.joincolumn; import javax.persistence.manytoone; import javax.persistence.sequencegenerator; import javax.persistence.table; import org.hibernate.annotations.genericgenerator; /** hennebrueder = = "book_sequence", sequencename = "book_id_seq") public class Book implements Serializable { private Integer id; private String title; private String author; private Customer customer; public Book() { super(); public Book(Integer id, String title, String author) { super(); this.id = id; this.title = title; this.author = "customer_id") public Customer getcustomer() { return customer; public void setcustomer(customer customer) { this.customer = customer; public String getauthor() { return author; public void setauthor(string author) { this.author = GenerationType.SEQUENCE, generator = "book_sequence") public Integer getid() { return id; public void setid(integer id) { this.id = id; public String gettitle() { return title; public void settitle(string title) { this.title = public String tostring() { return "Book: " + getid() + " Title " + gettitle() + " Author " + getauthor(); class Customer < ActiveRecord::Base has_many :books end class Book < ActiveRecord::Base belongs_to :customer end class Initial < ActiveRecord::Migration def self.up create_table :books do t t.column :name, :string t.column :author, :string t.column :customer_id, :integer end create_table :customers do t t.column :name, :string end end def self.down drop_table :books drop_table :customers end end JEE vs Rails Migration Customer Book Conventions at work!
180
181 Signal / Noise
182 Signal / Noise public void testbook() { Book book = new Book(null,"My first bean book", "Sebastian"); em.persist(book); Book book2 = new Book(null,"another book", "Paul"); em.persist(book2); Book book3 = new Book(null,"EJB 3 developer guide","sebastian"); em.persist(book3); [..] def test_book book = Book.create(:name => "My first bean book", :author => "Sebastian") book2 = Book.create(:name => "another book", :author => "Paul") book3 = Book.create(:name => "EJB 3 dev guide", :author => "Sebastian") [..]
183 Signal / Noise public void testbook() { Book book = new Book(null,"My first bean book", "Sebastian"); em.persist(book); Book book2 = new Book(null,"another book", "Paul"); em.persist(book2); Book book3 = new Book(null,"EJB 3 developer guide","sebastian"); em.persist(book3); [..] def test_book book = Book.create(:name => "My first bean book", :author => "Sebastian") book2 = Book.create(:name => "another book", :author => "Paul") book3 = Book.create(:name => "EJB 3 dev guide", :author => "Sebastian") [..]
184 Signal / Noise [..] System.out.println("list some books"); List somebooks = em.createquery("from Book b where b.author=:name").setparameter("name", "Sebastian").getResultList(); for (Iterator iter = somebooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); System.out.println("list all books"); List allbooks = em.createquery("from Book").getResultList(); for (Iterator iter = allbooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); [..] puts "list some books" Book.find_all_by_author("Sebastian").each { book puts book.inspect puts "list all books" Book.find(:all).each { book puts book.inspect
185 Signal / Noise [..] System.out.println("list some books"); List somebooks = em.createquery("from Book b where b.author=:name").setparameter("name", "Sebastian").getResultList(); for (Iterator iter = somebooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); System.out.println("list all books"); List allbooks = em.createquery("from Book").getResultList(); for (Iterator iter = allbooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); [..] puts "list some books" Book.find_all_by_author("Sebastian").each { book puts book.inspect puts "list all books" Book.find(:all).each { book puts book.inspect
186 Signal / Noise [..] System.out.println("list some books"); List somebooks = em.createquery("from Book b where b.author=:name").setparameter("name", "Sebastian").getResultList(); for (Iterator iter = somebooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); JDK 1.5 to the rescue (Generics, foreach) System.out.println("list all books"); List allbooks = em.createquery("from Book").getResultList(); for (Iterator iter = allbooks.iterator(); iter.hasnext();){ Book element = (Book) iter.next(); System.out.println(element); [..] puts "list some books" Book.find_all_by_author("Sebastian").each { book puts book.inspect puts "list all books" Book.find(:all).each { book puts book.inspect
187 Signal / Noise public void testrelation() { [..] Drei Books und zwei Customers angelegt customer1.getbooks().add(book); book.setcustomer(customer1); customer2.getbooks().add(book2); customer2.getbooks().add(book3); [..] Drei Books und zwei Customers angelegt customer1.books << book customer2.books << [book2, book3]
188 Signal / Noise public void testrelation() { [..] Drei Books und zwei Customers angelegt customer1.getbooks().add(book); book.setcustomer(customer1); customer2.getbooks().add(book2); customer2.getbooks().add(book3); [..] Drei Books und zwei Customers angelegt customer1.books << book customer2.books << [book2, book3]
189 Und mehr... class Book < ActiveRecord::Base belongs_to :customer has_many :chapters has_many :sections, :through => :chapters validates_presence_of :author validates_uniqueness_of :name validates_length_of :name, :within => 6..20, :too_long => "pick shorter name", :too_short => "pick longer name" end
190 Batteries included Rails bringt einiges mit: Struktur Build Testunterstützung Entwicklungs-, Test- und Produktionsumgebung Kein eigenes Denken notwendig Skripte und Automatismen verwenden gleiche Lokationen
191 Applikation
192 Applikation
193 Applikation
194 Applikation
195 Applikation
196 Applikation
197 Applikation
198 Applikation
199 Applikation
200 Applikation
201 Umgebung / Konfiguration
202 Umgebung / Konfiguration
203 Umgebung / Konfiguration
204 Umgebung / Konfiguration
205 Umgebung / Konfiguration
206 Umgebung / Konfiguration
207 Umgebung / Konfiguration
208 Umgebung / Konfiguration
209 Umgebung / Konfiguration
210 Umgebung / Konfiguration
211 Static Content / Skripte
212 Static Content / Skripte
213 Static Content / Skripte
214 Static Content / Skripte
215 Static Content / Skripte
216 Static Content / Skripte
217 Static Content / Skripte
218 Static Content / Skripte
219 Test
220 Test
221 Test
222 Test
223 Test
224 Test
225 Test
226 Test
227 wie geht s weiter?
228 Why The Lucky Stiff s: Inklusive Tutorial
229 A language that doesn t affect the way you think about programming is not worth knowing Alan Perlis
230 A language that doesn t affect the way you think about programming is not worth knowing Alan Perlis Jim Weirich s: 10 Things Every Java Programmer Should Now About Ruby Viele Dinge in dieser Präsentation dort geklaut.
231 Pickaxe 2nd edition Umfassend
232 The Ruby Way Umfassend Detailliert Zweites Buch?
233 Ruby for Rails Metaprogrammierung
234 Creating a Weblog in 15 Minutes
235 Agile Web Development with Rails (AWDR) 2nd Edition in Vorbereitung 1st Edition auch in Deutsch erhältlich
236 Rapid Web Development mit Ruby on Rails Deutsch 2nd Edition gerade erschienen
237 Weiterführend
238
239 ... und so lebten sie...
240 ... glücklich...
241 ... bis an s Ende ihrer Tage.
242 Danke! The text of this presentation is licensed under the Creative Commons License, Attribution-ShareAlike 2.5. As I don t have all the rights to the images in this presentation, the images and the Java source code are not covered by this license. I would also like to thank Babie Tanaka and the flickr users letioux and candiedwomanire that granted me the right to use their images. This work is licensed under the Creative Commons Attribution-ShareAlike 2.5 License. To view a copy of this license, visit or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.
This tutorial explains basics about EJB3 and shows a simple work through to set up a EJB 3 project, create a entity bean and a session bean facade.
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