12.1 Spring整合Hibernate

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一般用某ORM框架时，会在原有ORM API基础上编写封装类方便使用。很多工作Spring替我们做了。

混合使用：
一般的CRUD使用Hibernate，数据查询用iBaits或 Spring JDBC

原来典型的Hibernate配置文件

<!-- hibernate.cfg.xml  --><?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration><session-factory><property name="dialect">org.hibernate.dialect.MySQLDialect</property>       <!-- 数据库方言 --><property name="connection.url">jdbc:mysql://localhost:3306/db_examsystem</property><!-- 数据库连接URL --><property name="connection.username">root</property>    <!-- 数据库用户名 --><property name="connection.password">hehe</property>    <!-- 数据库用户密码 --><property name="connection.driver_class">               <!-- 数据库驱动类 -->com.mysql.jdbc.Driver</property><property name="show_sql">true</property><mapping resource="com/sanqing/po/Student.hbm.xml"/><mapping resource="com/sanqing/po/Teacher.hbm.xml"/><mapping resource="com/sanqing/po/Subject.hbm.xml"/>    </session-factory>
</hibernate-configuration>在Spring中指定配置文件：
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean" 
p:configLocation="classpath:hibernate.cfg.xml" />

抛弃hibernate.cfg.xml

实体类及类的配置文件：
例如 Forum.java   Forum.hbm.xml
见下面具体的写法。。Dao层：
基类Dao  BaseDao.java
public class BaseDao {@Autowiredprivate HibernateTemplate hibernateTemplate;//  set、get 
}ForumHibernateDao.java@Repository
public class ForumHibernateDao extends BaseDao{public void addForum(Forum forum) {// 配置文件里的hibernateTemplate传递给BaseDao,正好此处可以获取getHibernateTemplate().save(forum);}public void updateForum(Forum forum) {getHibernateTemplate().update(forum);}public Forum getForum(int forumId) {return getHibernateTemplate().get(Forum.class, forumId);}public long getForumNum() {Object obj = getHibernateTemplate().iterate("select count(f.forumId) from Forum f").next();return (Long) obj;}//  特殊！！public long getForumNum2() {Long forumNum = getHibernateTemplate().execute(new HibernateCallback<Long>() {public Long doInHibernate(Session session)throws HibernateException {Object obj = session.createQuery("select count(f.forumId) from Forum f").list().iterator().next();return (Long) obj;}});return forumNum;}public List<Forum> findForumByName(String forumName) {return (List<Forum>) getHibernateTemplate().find("from Forum f where f.forumName like ?", forumName + "%");}
}配置文件 application_hibernate.xml ：<context:component-scan base-package="chapter12"/>  <context:property-placeholder location="classpath:jdbc.properties" /><bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"destroy-method="close"p:driverClassName="${jdbc.driverClassName}"p:url="${jdbc.url}"p:username="${jdbc.username}"p:password="${jdbc.password}"/><!-- 为了处理BLOB/CLOB型数据  --><bean id="lobHandler" class="org.springframework.jdbc.support.lob.DefaultLobHandler"lazy-init="true" /><bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"p:dataSource-ref="dataSource"p:mappingDirectoryLocations="classpath:/chapter12/domain"p:lobHandler-ref="lobHandler"><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop><prop key="hibernate.show_sql">true</prop></props></property>  </bean>   <!-- 配置 HibernateTemplate--><bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"p:sessionFactory-ref="sessionFactory"></bean>  <!-- 配置 Hibernate的事务管理器  -->   <bean id="transactionManager"class="org.springframework.orm.hibernate3.HibernateTransactionManager"p:sessionFactory-ref="sessionFactory" /> <tx:annotation-driven transaction-manager="transactionManager"/>

处理LOB类型数据

在org.springframework.orm.hibernate3.support包中，可以处理LOB数据的类有：

实体类及配置文件

--   Forum.java
@Entity
@Table(name="T_FORUM")
public class Forum implements Serializable{@Id@Column(name = "FORUM_ID")private int forumId;@Column(name = "FORUM_NAME")private String forumName;@Column(name = "FORUM_DESC")private String forumDesc;public String toString(){return ToStringBuilder.reflectionToString(this);}//  get  set
}-- Forum.hbm.xml
<hibernate-mapping auto-import="true" default-lazy="false"><class name="chapter12.domain.Forum" table="t_forum"><id name="forumId" column="forum_id"><generator class="assigned" /></id><property name="forumName" column="forum_name" /><property name="forumDesc" column="forum_desc" /></class>
</hibernate-mapping>-- Topic.java
@Entity
@Table(name="T_TOPIC")
public class Topic implements Serializable {private static final long serialVersionUID = 1L; @Id@Column(name = "TOPIC_ID")private int topicId;@Column(name = "USER_ID")private int userId;@Column(name = "TOPIC_TITLE")private String topicTitle;@Column(name = "TOPIC_TIME")private Date topicTime;// 多个Topic对应一个Forum，JoinColumn表示的是表与表之间关联的那个字段，name属性如果不写，默认是：关联表的名称+“_”+ 关联表主键的字段名@ManyToOne@JoinColumn(name = "FORUM_ID")private Forum forum;@Column(name = "TOPIC_VIEWS")private int topicViews;// 一个Topic对应多个Post@OneToMany(mappedBy = "topic", cascade = CascadeType.ALL)private List<Post> posts;private int topicReplies;// get  set
}-- Topic.hbm.xml
特别的部分：
对应@ManyToOne@JoinColumn(name = "FORUM_ID")private Forum forum;
的   
<many-to-one name="forum" column="forum_id"class="chapter12.domain.Forum" />
对应private List<Post> posts;部分的配置不会写！！-- Post.java
@Entity
@Table(name="T_POST")
public class Post implements Serializable {@Id@Column(name = "POST_ID")private int postId;@Column(name = "USER_ID")private int userId;@ManyToOne@JoinColumn(name = "TOPIC_ID")private Topic topic;@Lob@Column(name = "POST_TEXT")private String postText;@Lob@Column(name = "POST_ATTACH")private byte[] postAttach;@Column(name = "POST_TIME")private Date postTime;// get && setpublic String toString(){return ToStringBuilder.reflectionToString(this);}
}-- Post.hbm.xml
特殊部分：<property name="postText" column="post_text"        type="org.springframework.orm.hibernate3.support.ClobStringType"/><property name="postAttach" column="post_attach"         type="org.springframework.orm.hibernate3.support.BlobByteArrayType"/><many-to-one name="topic" column="topic_id"class="com.baobaotao.domain.Topic" />

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