全注解SSH..doc

全注解SSH 一，hibernate annotation Class注解： @Entity：表明当前类是一个持久化类 @Table(name=team,catalog=NBA)：映射一个表team，所对应的数据库是NBA，可以省略 字段属性注解： @GenericGenerator(name = generator, strategy = increment) @Id @GeneratedValue(generator = generator) @Column(name = id, unique = true, nullable = false) 解释：表明该字段是主键，自增长，不为空而且是唯一的 @Column(name = description, length = 500) 解释：映射表中的description字段，长度是500 @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = category) 解释：级联操作：cascade = CascadeType.ALL，延迟加载：fetch = FetchType.LAZY，映射：mappedBy = category，一对多方式 @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = category_id) 解释：延迟加载：多对一方式，关联信息：外键name = category_id OneToMany事例代码： 数据库：mysql category表：id，name，description (Pkid) product表：id,name,price,description,category_id (pkid ，fkcategory_id) Category.java package com.b510.examples; import java.util.HashSet; import java.util.Set; // 标准注解 import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; //增加的注解 import org.hibernate.annotations.GenericGenerator; //当前的类是一个持久化类，是Category这个类。他映射了一个表category。所对应的 数据库是users //这句：@Table(name = category, catalog = users) 可以省略 @Entity @Table(name = category, catalog = users) public class Category implements java.io.Serializable { private static final long serialVersionUID = 3240281547213597385L; private Integer id; private String name; private String description; private SetProduct products = new HashSetProduct(0); public Category() { } public Category(String name, String description, SetProduct products) { = name; this.description = description; ducts = products; } // 主键 ：@Id 主键生成方式：strategy = increment //映射表中id这个字段，不能为空，并且是唯一的 @GenericGenerator(name = generator, strategy = increment) @Id @GeneratedValue(generator = generator) @Column(na