easy way to make the spring hibernate with camel case underscore. like userName mapping user_name

CamelCaseSessionCustomizer.java

link:http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/session-configuration.html#configuration-namingstrategy

table sql:

create table camel_case(
id int not null,
user_name varchar(20),
post_message varchar(30)
)

spring bean

@Entity
@Table
class CamelCase{
  long id;
  String userName;
  String postMessage;
}

properties file

hibernate.ejb.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

spring xml


<bean id="namingStrategy" class="${hibernate.ejb.naming_strategy}" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/><!-- 1、指定数据源 -->
        <property name="namingStrategy"  ref="namingStrategy"/>
        <property name="packagesToScan">
			<list>
				<value>com.app</value>
			</list>
		</property>
        <property name="hibernateProperties"><!-- 3、指定Hibernate属性 -->
            <props> 
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.query.substitutions">${hibernate.query.substitutions}</prop>
                <prop key="hibernate.default_batch_fetch_size">${hibernate.default_batch_fetch_size}</prop>
                <prop key="hibernate.max_fetch_depth">${hibernate.max_fetch_depth}</prop>
                <prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
                <prop key="hibernate.bytecode.use_reflection_optimizer">${hibernate.bytecode.use_reflection_optimizer}</prop>
                <!-- -->
                <prop key="hibernate.ejb.naming_strategy">${hibernate.ejb.naming_strategy}</prop>
                <prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</prop>
                <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
                <prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</prop>
                <prop key="net.sf.ehcache.configurationResourceName">${net.sf.ehcache.configurationResourceName}</prop>
                <prop key="hibernate.cache.use_structured_entries">${hibernate.cache.use_structured_entries}</prop>

            </props>
        </property>
    </bean>
    
 it is work.   

resources.properties

#DB
db.driver.class=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf8
db.username=root
db.password=yu

#Hibernate
hibernate.dialect=org.hibernate.dialect.MySQLInnoDBDialect
## hibernate camelcase underscore
hibernate.ejb.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy
hibernate.hbm2ddl.auto=none
hibernate.show_sql=false
hibernate.query.substitutions=true 1, false 0
hibernate.default_batch_fetch_size=16
hibernate.max_fetch_depth=2
hibernate.bytecode.use_reflection_optimizer=true
hibernate.cache.use_second_level_cache=false
hibernate.cache.use_query_cache=true
hibernate.cache.region.factory_class=org.hibernate.cache.EhCacheRegionFactory
net.sf.ehcache.configurationResourceName=/ehcache_hibernate.xml
hibernate.cache.use_structured_entries=true
hibernate.generate_statistics=true

spring xml

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:resources.properties</value>
            </list>
        </property>
    </bean>
    
    
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
		<property name="driverClass" value="${db.driver.class}" />
		<property name="jdbcUrl" value="${db.url}" />
		<property name="user" value="${db.username}" />
		<property name="password" value="${db.password}" />
    </bean>

    <bean id="namingStrategy" class="${hibernate.ejb.naming_strategy}" />

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/><!-- 1、指定数据源 -->
        <property name="namingStrategy"  ref="namingStrategy"/>
        <property name="packagesToScan">
			<list>
				<value>com.app</value>
			</list>
		</property>
        <property name="hibernateProperties"><!-- 3、指定Hibernate属性 -->
            <props> 
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.query.substitutions">${hibernate.query.substitutions}</prop>
                <prop key="hibernate.default_batch_fetch_size">${hibernate.default_batch_fetch_size}</prop>
                <prop key="hibernate.max_fetch_depth">${hibernate.max_fetch_depth}</prop>
                <prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
                <prop key="hibernate.bytecode.use_reflection_optimizer">${hibernate.bytecode.use_reflection_optimizer}</prop>
                <!-- -->
                <prop key="hibernate.ejb.naming_strategy">${hibernate.ejb.naming_strategy}</prop>
                <prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</prop>
                <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
                <prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</prop>
                <prop key="net.sf.ehcache.configurationResourceName">${net.sf.ehcache.configurationResourceName}</prop>
                <prop key="hibernate.cache.use_structured_entries">${hibernate.cache.use_structured_entries}</prop>

            </props>
        </property>
    </bean>