主要代码如下:
<!--自动在数据库中建立表 -->
<property name="hbm2ddl.auto">create</property>
2、在我使用spring mvc 整合hibernate时,代码如下:
<property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">create</prop> </props> </property> </bean>
JPA方法:
META-INF/persistence.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <persistence version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" xmlns:orm="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/persistence"> <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> ...... <properties> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.hbm2ddl.auto" value="update" /> <property name="hibernate.show_sql" value="false" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/> <property name="hibernate.cache.use_query_cache" value="true"/> <property name="hibernate.cache.use_second_level_cache" value="true"/> <property name="hibernate.generate_statistics" value="true"/> <property name="hibernate.use_sql_comments" value="true"/> <property name="hibernate.generate_statistics" value="true"/> </properties> </persistence-unit> </persistence>
applicationContext.xml
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="xDataSource" /> <property name="persistenceUnitName" value="org.jbpm.persistence.jpa" /> </bean>
值说明:
validate 加载hibernate时,验证创建数据库表结构
create 每次加载hibernate,重新创建数据库表结构。
create-drop 加载hibernate时创建,退出是删除表结构
update 加载hibernate自动更新数据库结构