3.是正確的<hibernate-configuration>

<session-factory>

<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>

<property name="hibernate.connection.username">root</property>

<property name="hibernate.connection.password"></property>

<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>

<property name="hibernate.hbm2ddl.auto">update</property>

<property name="hibernate.show_sql" >true</property>

<property name="hibernate.current_session_context_class">thread</property>

? ??

? ? <mapping resource="entity/Students.hbm.xml"/>

? ? <mapping resource="entity/Users.hbm.xml"/>

? ??

</session-factory>

</hibernate-configuration>