鹰翔宇空

import java.sql.*;
import java.io.*;
import oracle.sql.*;
public class WriteBlob {

  public static void main(String[] args) {

    try {
      DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
      Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","fankai","fankai");
      conn.setAutoCommit(false);

      BLOB blob = null;

      PreparedStatement pstmt = conn.prepareStatement("insert into javatest(name,content) values(?,empty_blob())");
      pstmt.setString(1,"fankai");
      pstmt.executeUpdate();
      pstmt.close();

      pstmt = conn.prepareStatement("select content from javatest where name= ? for update");
      pstmt.setString(1,"fankai");
      ResultSet rset = pstmt.executeQuery();
      if (rset.next()) blob = (BLOB) rset.getBlob(1);

      String fileName = "oraclejdbc.jar";
      File f = new File(fileName);
      FileInputStream fin = new FileInputStream(f);
      System.out.println("file size = " + fin.available());

      pstmt = conn.prepareStatement("update javatest set content=? where name=?");

      OutputStream out = blob.getBinaryOutputStream();

      int count = -1, total = 0;
      byte[] data = new byte[(int)fin.available()];
      fin.read(data);
      out.write(data);
      /*
      byte[] data = new byte[blob.getBufferSize()];  另一种实现方法,节省内存
      while ((count = fin.read(data)) != -1) {
        total += count;
        out.write(data, 0, count);
      }
      */

      fin.close();
      out.close();

      pstmt.setBlob(1,blob);
      pstmt.setString(2,"fankai");

      pstmt.executeUpdate();
      pstmt.close();

      conn.commit();
      conn.close();
    } catch (SQLException e) {
      System.err.println(e.getMessage());
      e.printStackTrace();
    } catch (IOException e) {
      System.err.println(e.getMessage());
    }
  }

}

package com.fankai;

import java.sql.Blob;

public class Cat {
  private String id;
  private String name;
  private char sex;
  private float weight;
  private Blob image;
  public Cat() { }

  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 char getSex() { return sex; }
  public void setSex(char sex) { this.sex = sex; }

  public float getWeight() { return weight; }
  public void setWeight(float weight) { this.weight = weight; }
 
  public Blob getImage() { return image; }
  public void setImage(Blob image) { this.image = image;}
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.fankai.Cat" table="cat">
        <!--jcs-cache usage="read-only"/-->
        <id name="id" unsaved-value="null">
            <generator class="uuid.hex"/>
        </id>
        <property name="name" length="16" not-null="true"/>
        <property name="sex" length="1" not-null="true"/>
        <property name="weight" />
        <property name="image" />
    </class>
</hibernate-mapping>

package com.fankai;

import java.sql.Blob;
import net.sf.hibernate.*;
import oracle.sql.*;
import java.io.*;

public class TestCatHibernate { 
  public static void testBlob() {
    Session s = null;   
    byte[] buffer = new byte[1];
    buffer[0] = 1;
    try {
      SessionFactory sf = HibernateSessionFactory.getSessionFactory();
      s = sf.openSession(); 
      Transaction tx = s.beginTransaction();
      Cat c = new Cat();
      c.setName("Robbin");
      c.setImage(Hibernate.createBlob(buffer));
      s.save(c);
      s.flush();
      s.refresh(c, LockMode.UPGRADE);   
      BLOB blob = (BLOB) c.getImage();     
      OutputStream out = blob.getBinaryOutputStream();   
      String fileName = "oraclejdbc.jar";
      File f = new File(fileName);
      FileInputStream fin = new FileInputStream(f);   
      int count = -1, total = 0;
      byte[] data = new byte[(int)fin.available()];
      fin.read(data);
      out.write(data);     
      fin.close();
      out.close();
      s.flush();
      tx.commit();
   
    } catch (Exception e) {
      System.out.println(e.getMessage());
    } finally {
      if (s != null)
        try {
          s.close();
        } catch (Exception e) {}
    }   
   
  }
}