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The Movies Application
63
Enterprise Objects and the Movies Database
Enterprise Objects Framework manages the interaction between the
database and objects in the Movies application. Its primary responsibility is
to fetch data from relational databases into enterprise objects. An enterprise
object, like any other object, couples data with methods for operating on
that data. In addition, an enterprise object has properties that map to stored
data. Enterprise object classes typically correspond to database tables. An
enterprise object instance corresponds to a single row or record in a database
table.
The Movies application centers around three kinds of enterprise objects:
Movies, MovieRoles, and Talents. A movie has many roles, and talents (or
actors) play those roles.
The Movie, MovieRole, and Talent enterprise objects in the Movies
application correspond to tables in a relational database. For example,
the Talent enterprise object corresponds to the TALENT table in the
database, which has LAST_NAME and FIRST_NAME columns. The
Talent enterprise object class in turn has
lastName and firstName instance
variables. In an application, Talent objects are instantiated using the data
from a corresponding database row, as shown in the following figure:
Enterprise Objects and Relationships
Relational databases model not just individual entities, but entities’
relationships to one another. For example, a movie has zero, one, or more
roles. This is modeled in the database by both the MOVIE table and
Talent
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lastName "Federighi"
firstName "Craig"
- GETTING STARTED 1
- WITH WEBOBJECTS 1
- Contents 3
- Table of Contents 5
- Refining Your Model 97 6
- About WebObjects 9
- About This Book 9
- Where to Go From Here 10
- Chapter 1 11
- Set project type here 14
- GuestBook 15
- Examining Your Project 17
- Launching WebObjects Builder 18
- Creating the Page’s Content 20
- Entering Static Text 21
- Using the Inspector 22
- Name: ” and press Enter 24
- Resizing the Form Elements 25
- Choose Static Inspector from 26
- Enter rows and columns here 26
- Binding Elements 27
- String directly in the box 28
- Binding the Input Elements 29
- Implementing an Action Method 30
- Variable definitions 32
- action method 32
- <HR> element) 33
- View Source File 34
- Click here to build 35
- Enhancing Your Application 37
- Duplicating Your Project 39
- PB.project 40
- PB.project.) 40
- Creating a Custom Guest Class 41
- Creating the Guest Object 46
- Main.java 47
- Creating a Guest List 48
- Application, which is 49
- Adding a Second Component 51
- represents the number 52
- WOString 52
- Using a Repetition 53
- Guest as its type 54
- Adding the Finishing Touches 56
- Adding a Dynamic Hyperlink 57
- "Main" 58
- Main”, because you 58
- Creating a WebObjects 59
- Database Application 59
- The Movies Application 62
- Designing the Main Page 65
- Specifying a Model File 66
- Choosing an Adaptor 67
- Specifying Primary Keys 71
- Shift-click to select more 72
- Choosing an Entity 74
- Choosing a Layout 75
- Examining the Variables 80
- Examining the Bindings 81
- Bindings in the Query Part 82
- Bindings in the Editing Part 83
- Refining Main.wo 85
- Specifying a Sort Order 86
- Setting a Date Format 88
- Setting a Number Format 89
- Optional Exercise 90
- Adding the MovieDetails Page 92
- Storing the Selected Movie 93
- Add the hyperlink below 94
- Movie Details 95
- MovieSearch 96
- Refining Your Model 97
- Switches to Table View 101
- Switches to Diagram View 101
- Switches to Browser View 101
- Advanced Relationship button 102
- This should be selected 102
- This box should be checked 102
- WebObjects Builder assigns 106
- Adding a Repetition 108
- Configuring a Repetition 109
- Running Movies 110
- return null; 112
- Adding a Form 113
- Adding a Talent Display Group 113
- Configuring the Browser 114
- Add the image buttons inside 116
- Talent in the Class field 118
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