Hibernate初体验Cat之快速上手－3

　　public void setSex(char sex) {
　　this.sex = sex;
　　}

　　public float getWeight() {
　　return weight;
　　}

　　public void setWeight(float weight) {
　　this.weight = weight;
　　}

　　}

　　3) 将以下代码保存为O/R映射文件Cat.hbm.xml，放入%WebApp%/WEB-INF/classes

　　<?xml version="1.0"?>
　　<!DOCTYPE hibernate-mapping
　　PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
　　"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
　　<hibernate-mapping>
　　<class name="net.sf.hibernate.examples.quickstart.Cat" table="CAT">
　　<!-- A 32 hex character is our surrogate key. It?s automatically
　　generated by Hibernate with the UUID pattern. -->
　　<id name="id" type="string" unsaved-value="null" >
　　<column name="CAT_ID" sql-type="char(32)" not-null="true"/>
　　<generator class="uuid.hex"/>
　　</id>
　　<!-- A cat has to have a name, but it shouldn? be too long. -->
　　<property name="name">
　　<column name="NAME" length="16" not-null="true"/>
　　</property>
　　<property name="sex"/>
　　<property name="weight"/>
　　</class>
　　</hibernate-mapping

　　4) 在数据库内建表，结构如下

　　Column |         Type          | Modifiers
　　--------+-----------------------+-----------
　　cat_id | character(32)         | not null
　　name   | character varying(16) | not null
　　sex    | character(1)          |
　　weight | real                  |
　　Indexes: cat_pkey primary key btree (cat_id)
　　

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