Oracle 文件字段(Blob)

package com;

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;


public class DBConnection {
	private static Connection con = null;
	public static synchronized  Connection getConnection() {
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); 
			con = DriverManager.getConnection(
					" jdbc:oracle:thin:@localhost:1521:ORCL", "scott", "tiger");
	
			return con;

		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	
}
 package com;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;


import oracle.jdbc.OracleConnection;
import oracle.jdbc.OracleResultSet;
import oracle.jdbc.driver.OraclePreparedStatement;


public class TestBlog {
	
	 private static OracleResultSet ors=null;//**这里rs一定要用Oracle提供的
	 private static OraclePreparedStatement opst=null;//**PreparedStatement用
	 private static OracleConnection con=null;
	
   public static void read_out(String toPath,String keyName) throws Exception{
	   con=(OracleConnection)DBConnection.getConnection();
	   FileOutputStream fout=null;
	   File file=new File(toPath);
	   
	   fout=new FileOutputStream(file);
	   
	   byte b[]=null;
	   String search="select name, IMAGE from test where name=? for update";
	 
	   opst=(OraclePreparedStatement)con.prepareStatement(search);
       
	   opst.setString(1,keyName);
	   ors=(OracleResultSet)opst.executeQuery();

	   if(ors.next()){
		   System.out.println(ors.getString(1));
		   oracle.sql.BLOB blob=ors.getBLOB(2);
		   System.out.println(blob.length());
		   b=blob.getBytes(1,(int) blob.length());/**从BLOB取出字节流数据*/

	   }
	   fout.write(b,0,b.length);
       fout.close(); 
       System.out.println("out write is ok.....");
       ors.close();
       con.close();
	   
   }
	public static void write_in(String filePath) throws Exception{
		con=(OracleConnection)DBConnection.getConnection();
		 String insert = "insert into test values (?,?,EMPTY_BLOB())";
		byte write[]=null;
		FileInputStream fin=null;
		
	    File file=new java.io.File(filePath);
	    fin=new  FileInputStream(file);
	    
	     int flength=(int)file.length();//**读入文件的字节长度
		   write=new byte[flength];
		   int n=0;
		   
		   n=fin.read(write, 0, flength-1);
		   /* 
		    * 该方法效率十分 低下
		    * for(int i=0;i<flength;i++){
			     n=fin.read(write,i,flength-i);   
			     System.out.println(i);
		   }*/
		   fin.close();
		   opst=(OraclePreparedStatement)con.prepareStatement(insert);
		   opst.setInt(1,7);
		   opst.setString(2,file.getName());
		   int up=opst.executeUpdate();
		   opst.clearParameters();
		   
		   String search="select IMAGE from test where name=? for update";
		   opst=(OraclePreparedStatement)con.prepareStatement(search);
		   opst.setString(1,file.getName());
		   
		   ors=(OracleResultSet)opst.executeQuery();

		   if(ors.next()){
			   oracle.sql.BLOB blob=ors.getBLOB(1);//**得到BLOB字段*//*
			   int j=blob.putBytes(1,write);//**将字节数组写入BLOB字段*//*
			   System.out.println("j==="+j);
		   }
		   ors.close();
		   con.close();
		   System.out.println("insert into ok");

	}
	public static void main(String[] args) throws Exception {
		String filePath = "e:\\test.jpg";
		write_in(filePath);
		//read_out(filePath, "test.docx");
	}
	
	
}