Hibernate+Spring彻底搞定Clob、Blob的存取

摘要：本文通过一个实例讲述如何通过Spring2+Hibernate3来快捷操作数据库中的Lob字段。

环境：Oracle10g、Srping2、Hibernate3、JUint4

说明：由于时间紧迫，没有详细写出思路。运行一下例子就明白了。

一、创建实体并添加Xdoclet的Hibernate标签

/**

* @author leizhimin

* @hibernate.mapping default-lazy="false"

* @hibernate.meta attribute="class-description" value="工作日志"

* @hibernate.class table="rc_gzrz"

public class WorkNote {

private Long id; //标识

private Date workDate; //日期

private String weather; //天气

private String content; //日志内容(Clob)

private String state; //日志状态

private Long orgId; //机构id

private Long userId; //用户id

private Date createDate; //创建日期

private byte[] image; //图片

public static final String WORKNOTE_BLANK = "00"; //未填写

public static final String WORKNOTE_FULL = "11"; //已填写

/**

* @hibernate.id generator-class="sequence" column="BS"

* @hibernate.meta attribute="field-description" value="标识"

* @hibernate.generator-param name="sequence" value="SEQ_GW"

public Long getId() {

return id;

}

public void setId(Long id) {

this.id = id;

}

/**

* @hibernate.property column="workDate" not-null="false" type="timestamp"

* @hibernate.meta attribute="field-description" value="工作日期"

public Date getWorkDate() {

return workDate;

}

public void setWorkDate(Date workDate) {

this.workDate = workDate;

}

/**

* @hibernate.property column="weather" not-null="false" length="24"

* @hibernate.meta attribute="field-description" value="天气"

public String getWeather() {

return weather;

}

public void setWeather(String weather) {

this.weather = weather;

}

/**

* @hibernate.property column="content" not-null="false" type="text"

* @hibernate.meta attribute="field-description" value="内容"

public String getContent() {

return content;

}

public void setContent(String content) {

this.content = content;

}

/**

* @hibernate.property column="state" not-null="false" length="2"

* @hibernate.meta attribute="field-description" value="状态"

public String getState() {

return state;

}

public void setState(String state) {

this.state = state;

}

/**

* @hibernate.property column="orgId" type="long"

* @hibernate.meta attribute="field-description" value="机构id"

public Long getOrgId() {

return orgId;

}

public void setOrgId(Long orgId) {

this.orgId = orgId;

}

/**

* @hibernate.property column="userId" type="long"

* @hibernate.meta attribute="field-description" value="用户id"

public Long getUserId() {

return userId;

}

public void setUserId(Long userId) {

this.userId = userId;

}

/**

* @hibernate.property column="createDate" not-null="false" type="timestamp"

* @hibernate.meta attribute="field-description" value="创建日期"

public Date getCreateDate() {

return createDate;

}

public void setCreateDate(Date createDate) {

this.createDate = createDate;

}

/**

* @hibernate.property column="image" type="blob" not-null="false"

* @hibernate.meta attribute="field-description" value="图片"

public byte[] getImage() {

return image;

}

public void setImage(byte[] image) {

this.image = image;

}

二、通过XDoclet生成Mapping，并修正lob映射的类型为Spring提供的类型

<?xml version="1.0" encoding="gb2312"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

" [url]http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd[/url]">

<hibernate-mapping

default-lazy="false"

<class

name="com.topsoft.oa.routine.domain.office.entity.WorkNote"

table="rc_gzrz"

<id

name="id"

column="BS"

type="java.lang.Long"

<!--

To add non XDoclet generator parameters, create a file named

hibernate-generator-params-WorkNote.xml

containing the additional parameters and place it in your merge dir.

-->

</generator>

</id>

<property

name="workDate"

type="timestamp"

update="true"

insert="true"

column="workDate"

not-null="false"

</property>

<property

name="weather"

type="java.lang.String"

update="true"

insert="true"

column="weather"

length="24"

not-null="false"

</property>

<property

name="content"

type="org.springframework.orm.hibernate3.support.ClobStringType"

update="true"

insert="true"

column="content"

not-null="false"

</property>

<property

name="state"

type="java.lang.String"

update="true"

insert="true"

column="state"

length="2"

not-null="false"

</property>

<property

name="orgId"

type="long"

update="true"

insert="true"

column="orgId"

</property>

<property

name="userId"

type="long"

update="true"

insert="true"

column="userId"

</property>

<property

name="createDate"

type="timestamp"

update="true"

insert="true"

column="createDate"

not-null="false"

</property>

<property

name="image"

type="org.springframework.orm.hibernate3.support.BlobByteArrayType"

update="true"

insert="true"

column="image"

not-null="false"

</property>

<!--

To add non XDoclet property mappings, create a file named

hibernate-properties-WorkNote.xml

containing the additional properties and place it in your merge dir.

-->

</class>

</hibernate-mapping>

三、通过Mapping 用XDoclet生成数据库（Oracle）脚本，并建表

drop table rc_gzrz cascade constraints;

create table rc_gzrz (

BS number(19,0) not null,

workDate timestamp,

weather varchar2(24 char),

content clob,

state varchar2(2 char),

orgId number(19,0),

userId number(19,0),

createDate timestamp,

image blob,

primary key (BS)

);

comment on table rc_gzrz is

'工作日志';

comment on column rc_gzrz.BS is

'标识';

comment on column rc_gzrz.workDate is

'工作日期';

comment on column rc_gzrz.weather is

'天气';

comment on column rc_gzrz.content is

'内容';

comment on column rc_gzrz.state is

'状态';

comment on column rc_gzrz.orgId is

'机构id';

comment on column rc_gzrz.userId is

'用户id';

comment on column rc_gzrz.createDate is

'创建日期';

comment on column rc_gzrz.image is

'图片';

四、创建DAO层

/**

* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2007-11-16

* Time: 10:55:50

* To change this template use File | Settings | File Templates.

public interface WorkNoteDAO extends CommonDAO {

/**

* 根据日期查询工作日志

* @param workDate 工作日期

* @param userId 用户id

* @param orgId 机构id

* @param sp 分页对象

* @return List

public List findWorkNoteByDate(Date workDate, Long userId, Long orgId, SplitPage sp);

/**

* 根据状态查询工作日志

* @param state 日志状态

* @param userId 用户id

* @param orgId 机构id

* @param sp 分页对象

* @return List

public List findWorkNoteByState(String state, Long userId, Long orgId, SplitPage sp);

}

/**

* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2007-11-16

* Time: 10:56:00

* To change this template use File | Settings | File Templates.

public class WorkNoteDAOImpl extends CommonDAOImpl implements WorkNoteDAO{

public List findWorkNoteByDate(Date workDate, Long userId, Long orgId, SplitPage sp) {

return null;

}

public List findWorkNoteByState(String state, Long userId, Long orgId, SplitPage sp) {

return null;

}

五、创建带JTA事务控制的业务service层

/**

* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2007-11-16

* Time: 16:43:57

* To change this template use File | Settings | File Templates.

public interface OfficeService {

public void saveWorkNote(WorkNote workNote);

public void updateWorkNote(WorkNote workNote);

}

/**

* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2007-11-16

* Time: 16:45:54

* To change this template use File | Settings | File Templates.

public class OfficeServiceImpl implements OfficeService{

private WorkNoteDAO workNoteDAO;

public WorkNoteDAO getWorkNoteDAO() {

return workNoteDAO;

}

public void setWorkNoteDAO(WorkNoteDAO workNoteDAO) {

this.workNoteDAO = workNoteDAO;

}

public void saveWorkNote(WorkNote workNote) {

this.workNoteDAO.saveObject(workNote);

}

public void updateWorkNote(WorkNote workNote) {

this.workNoteDAO.updateObject(workNote);

}

六、书写单元测试，并运行

/**

* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2007-11-16

* Time: 16:49:17

* To change this template use File | Settings | File Templates.

public class TestOffice extends TestCase {

public void test_worknote_save(){

OfficeService officeService = (OfficeService) ContextHelper.getContext().getBean("officeServiceProxy");

WorkNote workNote=new WorkNote();

workNote.setContent(" [url]http://lavasoft.blog.51cto.com/[/url]");

workNote.setOrgId(Long.parseLong("999"));

workNote.setCreateDate(new Date());

byte[] b="lavasoft".getBytes();

workNote.setImage(b);

officeService.saveWorkNote(workNote);

}

看看测试结果：

看到了吧，存进去了，各位周末愉快～～

本文转自 leizhimin 51CTO博客，原文链接：http://blog.51cto.com/lavasoft/50858，如需转载请自行联系原作者