anchor.diff:  			// 데이터베이스 연결정보를 이용해 Connection 인스턴스 확보
   			conn = DriverManager.getConnection(jdbc_url,"jspbook","1234");
   			String sql1 = "select count(boardno) from board";
  -			String sql2 = "select boardno, title,usernameboard, content, date, uploadfilename  from jspdb.board order by boardno DESC";
  +			String sql2 = "select boardno, title,usernameboard, content, date, uploadfilename, slidelength from jspdb.board order by boardno DESC";
   			pstmt = conn.prepareStatement(sql1);
   			rs1=pstmt.executeQuery();
   			pstmt = conn.prepareStatement(sql2);
  
positive.code: 				  <div class='post'> 
    <h2><%=rs2.getString("title")%></h2> 
    <p><%=rs2.getString("content")%></p> 
     <%if(rs2.getString("uploadfilename").contains(".ppt")){
  	%><img src="upload/img/<%=rs2.getString("uploadfilename").substring(0, rs2.getString("uploadfilename").indexOf("."))%>1.jpg"class="img-responsive" alt="Responsive image"><% 
    }if(rs2.getString("uploadfilename").contains(".jpg")){%>
    <img src="upload/<%=rs2.getString("uploadfilename")%>" class="img-responsive" alt="Responsive image"><% 
    }%>
    <p>작성자 : <%=rs2.getString("usernameboard")%></p> 
    <p>작성시간 : <%=today%></p> 
    <p>첨부파일 : <%=rs2.getString("uploadfilename")%></p>
  
negative.code: 	} 
  	.form-signin .form-signin-heading { margin-bottom: 10px; } 
  	.form-signin input { font-size: 16px; height: auto; margin-bottom: 15px; padding: 7px 9px; } 
  	
  	
  	</style> 
  
  	
  	<%	
  	String id = (String)session.getAttribute("loginid"); //#로그인한#id를#체크#
  
  	if (id != null) { //#로그인상태#
  		// 데이터베이스 연결관련 변수 선언
  		Connection conn = null;
  