?? category.java
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package net.jeffrey.hibernate;import java.io.Serializable;import java.util.ArrayList;import java.util.List;import javax.persistence.Entity;import javax.persistence.OneToMany;import net.jeffrey.hibernate.history.Historizable;import org.hibernate.annotations.Cascade;/** * 商品分類 * @author jeffrey */@Entitypublic class Category extends AbstractEntity implements Serializable, Historizable { private String name; @OneToMany(mappedBy = "category") // 定義級聯,必須使用hibernate的級聯annotation,JPA的Cascade不起作用 @Cascade(org.hibernate.annotations.CascadeType.ALL) private List<Product> products = new ArrayList<Product>(); public String getName() { return name; } public void setName(String name) { this.name = name; } public List<Product> getProducts() { return products; } public void setProducts(List<Product> products) { this.products = products; } /* Helper方法,在添加商品的同時建立雙方的關聯關系 */ public void addProduct(Product p) { if (p != null) { p.setCategory(this); this.products.add(p); } } /* Helper方法,在刪除商品的同時解除雙方的關聯關系 */ public void removeProduct(Product p) { if (p != null) { p.setCategory(null); this.products.remove(p); } } @Override public String toString() { return "Category[" + id + "," + name + "]"; } @Override public boolean equals(Object obj) { if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } final Category other = (Category) obj; if (this.id != other.id && (this.id == null || !this.id.equals(other.id))) { return false; } return true; } @Override public int hashCode() { int hash = 3; return hash = 47 * hash + id; }}
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