oracle中BLOB的寫入、讀取與修改

寫入   

public boolean saveWordFile(String filePath) {
        File file = new File(filePath);
        Connection conn = getConnection();
        try {
            java.sql.Statement st = conn.createStatement();
            conn.setAutoCommit(false);
            st.execute("insert into table_name values(1,empty_blob())");
            ResultSet rs = st
                    .executeQuery("select id,word from table_name where id=1 for update");
            if (rs.next()) {
                BLOB blob = (BLOB) rs.getBlob("word");
                OutputStream outStream = blob.getBinaryOutputStream();
                InputStream fin = new FileInputStream(file);
                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();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return true;
    }

讀取

    public void getWordFile(String id) {
        Connection conn = getConnection();
        java.sql.Statement st;
        try {
            st = conn.createStatement();
            ResultSet rs = st.executeQuery("select id,word from table_name where id='"+id+"'");
            if (rs.next()) {
                BLOB blob = (BLOB) rs.getBlob("word");
                File file = new File("c://filename.doc");
                FileOutputStream output = new FileOutputStream(file);
                InputStream input = blob.getBinaryStream();
                byte[] buffer = new byte[1024];
                int i = 0;
                while ((i = input.read(buffer)) != -1) {
                    output.write(buffer, 0, i);
                }
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

修改

 public void updateblob(String id){
  Connection conn=getConnection();
  Statement stem=null;
  ResultSet rs=null;
  try{
         conn.setAutoCommit(false);
         stem=conn.createStatement();
         rs = stem.executeQuery("select word from table_name where id='"+id+"' for update");
        
         if (rs.next()) {
             BLOB blob = (BLOB) rs.getBlob("word");
             OutputStream outStream = blob.getBinaryOutputStream();
             InputStream fin = new FileInputStream("c://2.doc");
             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();
         }
} catch (Exception ex){
 try {
  conn.rollback();
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
  System.out.println(ex.getMessage());
}
 }