2007-12-10

Hibernate读写Clob和Blob类型字段

数据库脚本：

create table testcb(id varchar(32) primary key,name varchar(32),photo blob,description text);

 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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
    <property name="connection.username">root</property>
    <property name="connection.url">
        jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&amp;useUnicode=true
    </property>
    <property name="dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="myeclipse.connection.profile">mysql</property>
    <property name="connection.password">1234</property>
    <property name="connection.driver_class">
        com.mysql.jdbc.Driver
    </property>
    <property name="hibernate.dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="hibernate.show_sql">true</property>
    <property name="current_session_context_class">thread</property>
    <mapping resource="Search/Clob_Blob/TestCB.hbm.xml" />

</session-factory>

</hibernate-configuration>

 

POJO：

 

package Search.Clob_Blob;

import java.sql.Blob;
import java.sql.Clob;

public class TestCB {
    private String id; //标识id
    private String name; //学生姓名
    private Blob photo;
    private Clob description;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Blob getPhoto() {
        return photo;
    }
    public void setPhoto(Blob photo) {
        this.photo = photo;
    }
    public Clob getDescription() {
        return description;
    }
    public void setDescription(Clob description) {
        this.description = description;
    }
    
  
}

 

TestCB.hbm.xml

 

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="Search.fetch" >
   
    <class name="Search.Clob_Blob.TestCB" table="testcb" lazy="true">
       <id name="id" column="id" unsaved-value="null">
         <generator class="uuid.hex"></generator>
       </id>

       <property name="name" column="name" type="string"></property>
       <property name="photo" column="photo" type="blob"></property>
       <property name="description" column="description" type="clob"></property>
      
      </class>
</hibernate-mapping>

 

准备一个图片sample.jpg放在Clob_Blob包下

 

写Blob和Clob测试代码：

 

package Search.Clob_Blob;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Blob;
import java.sql.Clob;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class Test {


    public static void main(String[] args) {
        String filePath=System.getProperty("user.dir")+File.separator+"src/Search/Clob_Blob"+File.separator+"hibernate.cfg.xml";
        File file=new File(filePath);
        SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
        Session session=sessionFactory.openSession();
        Transaction tx=session.beginTransaction();
        try {
            String imgPath=System.getProperty("user.dir")+File.separator+"src/Search/Clob_Blob"+File.separator+"sample.jpg";
            FileInputStream fis=new FileInputStream(imgPath);
            Blob photo=Hibernate.createBlob(fis);
            Clob description=Hibernate.createClob("this is description");
            TestCB testcb=new TestCB();
            testcb.setName("tom1");
            testcb.setPhoto(photo);
            testcb.setDescription(description);
            session.save(testcb);
            tx.commit();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }
        
        

    }

}

、

运行后，在mysql客户端中可以看到已经成功保存：

运行读取测试代码：

 

package Search.Clob_Blob;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.SQLException;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class TestRead {


    public static void main(String[] args) {
        String filePath=System.getProperty("user.dir")+File.separator+"src/Search/Clob_Blob"+File.separator+"hibernate.cfg.xml";
        File file=new File(filePath);
        SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
        Session session=sessionFactory.openSession();
        Transaction tx=session.beginTransaction();
        
        //读取clob和blob
        String imgPath=System.getProperty("user.dir"
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