『JAVA基础』往数据库中录入图片的方法

前些天写了几个录入图片的方法,不是很完善,还有点小问题,在这里贴出来,希望给需要的朋友带来些便利!
 
方法一、代码如下:
public void updatePhoto() throws Exception{
  Connection conn = MyCon.getCon();
  File file = new File( "c:/yflower.gif");
  InputStream input = new FileInputStream(file);
  String sql = "UPDATE SHOW.DEPT_INFO SET PICTURE2=? WHERE ID=445";
  PreparedStatement pstm = conn.prepareStatement(sql);
  pstm.setBinaryStream(1, input, Integer.parseInt(String.valueOf(file.length())));
   int count = pstm.executeUpdate();
   if(count>0){
      System.out.println( "--------------成功更新图片!");
  }
  pstm.close();
  input.close();
  
    }
此代码有些问题,只能存放小图片,插入大图片时会报错!
 
 
方法二、代码如下:



public void updatePhoto2() throws Exception{
  Connection conn = MyCon.getCon();
  conn.setAutoCommit( false);
  Statement stm = conn.createStatement();
  ResultSet rs  = stm.executeQuery( "SELECT PICTURE2 FROM SHOW.DEPT_INFO WHERE ID=445 FOR UPDATE");
  oracle.sql.BLOB blob= null;
     if (rs.next()){  
        blob=(oracle.sql.BLOB) rs.getBlob( "PICTURE2");  
        System.out.println( "==========="+blob);
     }  
   OutputStream outStream= null;
   if(blob== null){
    
   }
   outStream = blob.getBinaryOutputStream();  
    File file = new File( "C:/Documents and Settings/Administrator/桌面/aaa/b.jpg");  
    InputStream fin = new FileInputStream(file);  
//  将输入流写到输出流  
   byte[] b = new byte[blob.getBufferSize()];  
           int len = 0;  
           while ( (len = fin.read(b)) != -1) {  
            outStream.write(b, 0, len);  
          }  
          fin.close();  
          outStream.flush();  
          outStream.close();  
          conn.commit();  
          conn.close();  
    }
 
 
感谢您的支持!我会将代码更加完善,并共享出来!

你可能感兴趣的:(职场,休闲,录入图片)