Hibernate，一对多，多对一

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
       <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property>
        <property name="connection.username">scott</property>
        <property name="connection.password">tiger</property>
        

        <!-- JDBC connection pool (use the built-in) -->
       <!--  <property name="connection.pool_size">10</property> -->
        
        <!-- 数据库连接最小连接数 -->
        <property name="c3p0.min_size">10</property>
        <!-- 数据库连接最大连接数 -->
        <property name="c3p0.max_size">100</property>
        <property name="c3p0.timeout">3000</property>
        <property name="hibernate.temp.use_jdbc_metadata_defaults">false</property> 


    
        <!-- SQL dialect 方言-->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>

        <!-- Echo all executed SQL to stdout(控制台) -->
        <property name="show_sql">true</property>

        <!-- 格式化sql语句输出查看 -->
        <property name="format_sql">true</property>
        
        
        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property> 
        
        <!-- 实体类对应的映射文件 -->
        <mapping resource="com/zhiyou/entity/User.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.zhiyou.entity">
    <!-- class:指定实体类   name:实体类名称    table：数据库中的表名称 -->
    <class name="User" table="user1">
    <!-- id主键 -->
        <id name="name" column="user_name">
               <!-- 主键生成策略    assigned:用户自己指定主键  
                sequence:指定oracle数据库的序列
                uuid：产生32位字符串
                native:自动根据数据库选择主键生成策略
                -->
           <!--  <generator class="sequence">
            参数名
            <param name="sequence">seq_test</param>
            </generator> -->
            
            <generator class="native"></generator>
            
        </id>
        <property name="pwd" column="password"/>
        <property name="role" column="role"/>
    </class>

</hibernate-mapping>