public static void Updatetrema(){
		
		try {
			   if(conn == null || conn.isClosed()){
			    conn = DatabaseConnection.getConnection();
			   }
			  } catch (SQLException e1) {
			   // TODO Auto-generated catch block
			   e1.printStackTrace();
			  }
		
		try{
			conn.setAutoCommit(false);
			PreparedStatement stmnt = conn.prepareStatement("UPDATE Books set isbn = CONCAT( UPPER( LEFT( publisher, 1 ) ) , SUBSTRING( publisher, 2 ))");
			stmnt.execute();
			conn.commit();
			conn.setAutoCommit(true);
		}catch(SQLException e){
			e.printStackTrace();
		}
}