Apple WebObjects 3.5 Instrukcja Użytkownika Strona 69
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Designing the Main Page
69
A relationship is a link between two entities that’s based on attributes of the
entities. For example, the Movie entity has a relationship to the MovieRole
entity based on the entities’
movieId attributes (although the attributes in this
example have the same name in both entities, they don’t have to). This
relationship makes it possible to find all of a Movie’s MovieRoles.
How complete the basic model is depends on how completely the schema
information is inside your database server. For example, the wizard includes
relationships in your model only if the server’s schema information specifies
foreign key definitions.
Using the options in this page, you can supplement the basic model with
additional information. (Note that the wizard doesn’t modify the
underlying database.)
1. Check the “Assign primary keys to all entities” box.
Enterprise Objects Framework uses primary keys to uniquely identify
enterprise objects and to map them to the appropriate database row.
Therefore, you must assign a primary key to each entity you use in
your application. The wizard automatically assigns primary keys to the
model if it finds primary key information in the database’s schema
information.
Checking this box causes the wizard to prompt you to choose primary
keys that aren’t defined in the database’s schema information. If your
database doesn’t define them, the wizard later prompts you to choose
primary keys.
2. Check the “Ask about relationships” box.
If there are foreign key definitions in the database’s schema
information, the wizard includes the corresponding relationships in the
basic model. However, a definition in the schema information doesn’t
provide enough information for the wizard to set all of a relationship’s
options. Checking this box causes the wizard to prompt you to provide
the additional information it needs to complete the relationship
configurations.
- 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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