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@Table(name = "BOOKS") public class Book implements Serializable { @Id @Column(name = "ISBN") private String isbn; @Column(name = "TITLE", nullable = false) private String title; @Column(name = "AUTHOR", nullable = false) private String author; @Column(name = "PRICE", nullable = false) private Double price; @Column(name = "QUANTITY", nullable = false) private Integer quantity; @OneToMany(mappedBy="book", cascade = CascadeType.ALL) private List<ShoppingCart> shoppingCarts; public List<ShoppingCart> getShoppingCarts(){ return shoppingCarts; } public void setShoppingCarts(List<ShoppingCart> shoppingCarts) { this.shoppingCarts = shoppingCarts; } public Book() { } public String getIsbn() { return this.isbn; } public void setIsbn(String isbn) { this.isbn = isbn; } public String getTitle() { return this.title; } public void setTitle(String title) { this.title = title; } public String getAuthor() { return this.author; } public void setAuthor(String author) { this.author = author; } public Double getPrice() { return this.price; } public void setPrice(Double price) { this.price = price; }

The Dojo library focuses on creating a platform on which to build desktop-like web applications like the e-mail example shown in Figure 4-2. It can be daunting and would certainly be overkill if all you ever need to do is add some animation to your blog.

Summary

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public Integer getQuantity() { return this.quantity; } public void setQuantity(Integer quantity) { this.quantity = quantity; } } Now you can move on and modify the ShoppingCart entity, defining an association to the Book entity. Listing 9-10 shows the updated ShoppingCart entity. Listing 9-10. Source Code for the Updated ShoppingCart Entity package ejbjpa.entities; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; import javax.persistence.Table; import javax.persistence.ManyToOne; import javax.persistence.JoinColumn; @Entity @Table(name = "SHOPPINGCARTS") @IdClass(value = ejbjpa.entities.ShoppingCartKey.class) public class ShoppingCart implements Serializable { @Id @Column(name = "CART_ID") private Integer cart_id; @Id @Column(name = "BOOK_ID", insertable=false, updatable=false) private String book_id; @Column(name = "UNITS", nullable = false) private Integer units; @Column(name = "UNIT_PRICE", nullable = false) private Double unit_price; @ManyToOne @JoinColumn( name="BOOK_ID", referencedColumnName="ISBN") private Book book; public ShoppingCart() { } public Book getBook() { return this.book; }

public void setBook(Book book) { this.book = book; } public Integer getCart_id() { return this.cart_id; } public void setCart_id(Integer cart_id) { this.cart_id = cart_id; } public Integer getUnits () { return this.units; } public void setUnits(Integer units) { this.units = units; } public Double getUnit_price() { return this.unit_price; } public void setUnit_price(Double unit_price) { this.unit_price = unit_price; } } Note that in the ShoppingCart entity shown in the listing, the BOOK_ID column is mapped twice: first as a primary key field, book_id, and then as a relationship field, book. However, since the persistence provider cannot allow you to have two writable entity fields mapped to the same underlying table column, you have to define one of them as read-only. That is why you set insertable=false and updatable=false when defining the book_id entity field. Otherwise, you will end up with the following error: Multiple writable mappings exist for the field [SHOPPINGCARTS.BOOK_ID]. Only one may be defined as writable, all others must be specified read-only. Now that you have the entities, it s time to put them to use. The CompositeKeyTestServlet servlet shown in Listing 9-11 illustrates how you might create some ShoppingCart entities, persist them to the database, and then obtain them from the database again. The servlet assumes that in addition to the ShoppingCart.java and Book.java files discussed earlier, you also have the ShoppingCartKey.java in the /src/ejbjpa/entities directory, created as shown in Listing 8-4 in 8. Listing 9-11. Source Code for the CompositeKeyTestServlet Servlet package ejbjpa.servlets; import java.io.*; import java.util.*; import java.sql.*;

Figure 4-2. A Dojo example that uses many of the widgets available within the toolkit Dojo covers all three of the key areas that libraries attempt to address: it smoothes the rough terrain of working with the DOM, it includes many application conveniences, and it includes many prebuilt widgets.

In this chapter, you learned about CouchDB views and how they are used to aggregate and report on the data in a CouchDB database. You discovered how CouchDB uses map/reduce views instead of SQL statements to interact with data. You then learned how to create and execute temporary views using the Futon interface, before saving these views in special design documents in the CouchDB database. Finally, you learned how to use the CouchDB RESTful HTTP API to run and create views and design documents. In the next chapter, you will explore in depth the concept of map/reduce and how it applies to CouchDB views. In 9, you will move on to some more advanced CouchDB view concepts and examples.

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