Will the following config temper with the data on existing tables at all?

Code:
	<bean id="hibernateSession" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource"><ref bean="dataSource"/></property>
		<property name="configLocation"><value>WEB-INF/hibernate.cfg.xml</value></property>
		<!-- <property name="configurationClass"><value>org.hibernate.cfg.AnnotationConfiguration</value></property> -->
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.Oracle9iDialect</prop>
				<!-- <prop key="hibernate.hbm2ddl.auto">update</prop> -->
			</props>
		</property>
	</bean>
All my tables exist with data on them. I wouldn't like hibernate to drop tables without me knowing ...