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Thread: servlet refresh problem after database query

  1. #1
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    Default servlet refresh problem after database query

    Hi,

    I am calling a stored procedure to receive data in a results set, I loop through the results set and create hidden fields with the results. The data is coming back correctly and everthing is fine until I run the same servlet again, it doesnt work unless I hit the refresh button, can someone clarify if am closing the DB connections correctly or if there is some other issue, see code below. If I take out the db query and just hardcode the input fields it works every time I run.
    CallableStatement cstmt = null;
     
    			this.getDbManager().closeDbStatement();
     
    		try {
    			this.getDbManager().createDbStatement();
    			cstmt = this.getDbManager().getDbConnection().prepareCall("{call  myproc(?,?,?,?,?)}");
     
    			cstmt.setDouble(1,Double.parseDouble(this.getRequest().getParameter("xBl")));
    			cstmt.setDouble(2,Double.parseDouble(this.getRequest().getParameter("yBl")));
    			cstmt.setDouble(3,Double.parseDouble(this.getRequest().getParameter("xTr"))); 
    			cstmt.setDouble(4,Double.parseDouble(this.getRequest().getParameter("yTr")));
    			cstmt.registerOutParameter(5, OracleTypes.CURSOR);
    			cstmt.execute(); 
     
    			ResultSet rs = (ResultSet) cstmt.getObject(5);
     
    			String f_num = new String();
    			int i = 1;
    			String p_num = new String();
    			int p = 1;
    			while (rs.next()) {
    				f_num = rs.getString("f");
    				p_num = rs.getString("p");
    				out.println("\t\t<INPUT TYPE=HIDDEN NAME=\"f_id" + i
    						+ "\" VALUE=\"" + f_num + "\">\n");
    				out.println("\t\t<INPUT TYPE=HIDDEN NAME=\"p_id" + p
    						+ "\" VALUE=\"" + p_num + "\">\n");
     
    				p++;
    				i++;
    						      }
    				rs.close();
    		      cstmt.close();
     
    		      this.getDbManager().closeDbStatement();
    		      this.getDbManager().closeDbConnection();
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			exceptionErrorLog(e, this.getClass().getName() + "debug1 " + e.toString());
    		} finally{
    		      //finally block used to close resources
    		      try{
    		         if(cstmt!=null)
    		            cstmt.close();
    		      }catch(SQLException se2){
    		      }// nothing we can do
     
    		}
    		}
    Last edited by copeg; January 12th, 2012 at 12:27 PM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: servlet refresh problem after database query

    For future reference, please wrap your code in the code tags

    What do you mean by 'run the servlet again'? To me, this equates to reloading. If you are accessing this via a browser, does your browser cache the webpage? Try accessing the servlet using a non-cachable route

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