Hibernate06_ID生成策略

第一种native , id自增， 相当于primary key auto_increment;
Book.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping
        SYSTEM
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<!-- 映射对应的package -->
<hibernate-mapping package="com.chb.model">
    <!-- 实体类Book与数据库中表Book_info对应 -->
    <class name="Book" table="book_table">
        <id name="id" column="book_id">
            <!-- id主键， 设为自增 -->
            <generator class="native"></generator>
        </id>
        <property name="name" column="book_name"></property>
        <property name="price" column="book_price"></property>
    </class>
</hibernate-mapping>