Posted on 2007-04-16 15:37
七郎归来 阅读(1924)
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用hibernate封装oracle的clob类型操作起来很不方便,但是新的oracle10g的jdbc驱动,对此有很多改进。
环境 :wodows2000、oracle9.2、oracle10gJDBC驱动(必须)、hibernate3.1.2
oracle官方网站的clob操作方法:http://www.oracle.com/technology/sample_code/tech/java/codesnippet/jdbc/clob10g/ClobManipulationIn10g.java.html
建表脚本:
/*==============================================================*/
/* Table: StoreFile */
/*==============================================================*/
create table StoreFile (
uuid VARCHAR2(128) not null,
name VARCHAR2(200),
text CLOB,
constraint PK_STOREFILE primary key (uuid)
);
hibernate.cfg.xml:(注意多了个SetBigStringTryClob设置,其它没有什么特殊的了)
<?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="hibernate.cglib.use_reflection_optimizer">true</property>
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.password">java</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@10.128.4.69:1521:kf</property>
<property name="hibernate.connection.username">java</property>
<property name="hibernate.connection.SetBigStringTryClob">true</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.OSCacheProvider</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</property>
<mapping resource="com/study/database/hb/map/File.hbm.xml"/>
</session-factory>
</hibernate-configuration>
File.hbm.xml文件
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2006-3-13 17:57:00 by Hibernate Tools 3.1.0.beta4 -->
<hibernate-mapping>
<class name="com.study.database.hb.map.File" table="StoreFile" batch-size="0">
<id name="uuid" type="string">
<column name="UUID" length="128" />
<generator class="uuid.hex"></generator>
</id>
<property name="name" type="string" lazy="false">
<column name="NAME" length="200"/>
</property>
<property name="file" type="string" lazy="false">
<column name="text" />
</property>
</class>
</hibernate-mapping>
File.java文件
package com.study.database.hb.map;
// Generated 2006-3-13 17:57:00 by Hibernate Tools 3.1.0.beta4
import java.sql.Clob;
/**
* File generated by hbm2java
*/
public class File
implements java.io.Serializable
{
// Fields
private String uuid;
private String name;
private String file;
// Constructors
/** default constructor */
public File()
{
}
/** full constructor */
public File(String name,String file)
{
this.name=name;
this.file=file;
}
// Property accessors
public String getUuid()
{
return this.uuid;
}
public void setUuid(String uuid)
{
this.uuid=uuid;
}
public String getName()
{
return this.name;
}
public void setName(String name)
{
this.name=name;
}
public String getFile()
{
return this.file;
}
public void setFile(String file)
{
this.file=file;
}
}
//比以前特殊的地方是hibernate.cfg.xml多了个SetBigStringTryClob设置。
//把clob映射成string类型,这样在多过4000个字符时也不会出错了。操作方法和普通的string类型一样。