for loop is not working in my program

Sir/Madam, I need help to execute for loop. Please help me. this program can't check about the user is exists or not.. Please help me where I'm wrong.

   function varargout = home(varargin)
  % HOME MATLAB code for home.fig
  %      HOME, by itself, creates a new HOME or raises the existing
  %      singleton*.
  %
  %      H = HOME returns the handle to a new HOME or the handle to
  %      the existing singleton*.
  %
  %      HOME('CALLBACK',hObject,eventData,handles,...) calls the local
  %      function named CALLBACK in HOME.M with the given input arguments.
  %
  %      HOME('Property','Value',...) creates a new HOME or raises the
  %      existing singleton*.  Starting from the left, property value pairs are
  %      applied to the GUI before home_OpeningFcn gets called.  An
  %      unrecognized property name or invalid value makes property application
  %      stop.  All inputs are passed to home_OpeningFcn via varargin.
  %
  %      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
  %      instance to run (singleton)".
  %
  % See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help home

% Last Modified by GUIDE v2.5 27-Mar-2017 10:36:35

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @home_OpeningFcn, ...
                   'gui_OutputFcn',  @home_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

end
% --- Executes just before home is made visible.
function home_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to home (see VARARGIN)

% Choose default command line output for home
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);
end
% UIWAIT makes home wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = home_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

end
function user_name_Callback(hObject, eventdata, handles)
% hObject    handle to user_name (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of user_name as text
%        str2double(get(hObject,'String')) returns contents of user_name as a double
guidata(hObject, handles);

end

% --- Executes during object creation, after setting all properties.
function user_name_CreateFcn(hObject, eventdata, handles)
% hObject    handle to user_name (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

end
% --- Executes on button press in signup.
function signup_Callback(hObject, eventdata, handles)
% hObject    handle to signup (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% fig=openfig('signup','reuse','visible');
 %     set(fig,'Color',get(0,'defaultUicontrolBackgroundColor'));
 run('signup');

end

% --- Executes on button press in signin.
function signin_Callback(hObject, eventdata, handles)
% hObject    handle to signin (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global user_name_exist;
uname1 = get(handles.user_name,'String');
%edit1 being Tag of ur edit box
 if isempty(uname1)
  % errordlg('Please enter Username');
   uiwait(warndlg('Please Enter Username'));

conn = database('mani','root','MARUTHI');
curs=exec(conn,'select uname from user2');
         curs=fetch(curs);curs.Data

for i=numel(curs.Data)

        if(strcmp(curs.Data(i),uname1))
            disp('hallo');
            % Create figure
            user_name_exist=1;
            disp(user_name_exist);
            disp('hai');
            break;

        else
            user_name_exist=0;
            %figure('Name','imgsel.fig');

        end
  end
       if(user_name_exist==1)
     %  Image_mag(handles.uname);
     % fig=run('Image_mag.m','reuse','visible');
    %set(fig,'Color',get(0,'defaultUicontrolBackgroundColor'));
    run('Image_mag')      
    % handles.fig=figure('Units','Pixels', ... 
     %    'Position',[100 100 500 500]);
      % msgbox(size(curs.Data));
     %han1111dles.signin=Image_mag;

   %set(handles.fig,Image_mag,{ImagesExample,handles});

       else
           uiwait(warndlg('Please enter a valid User name'));
       end
   close(curs);

        close(conn);
   end
  end
  % --- Executes on button press in cancel.
  function cancel_Callback(hObject, eventdata, handles)
  % hObject    handle to cancel (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
  close
  end

Answer 1

[Jan]

The only for loop in the code is:

for i = numel(curs.Data)

It runs for 1 iteration only. Perhaps you want:

for i = 1:numel(curs.Data)

[Maruthi Maruthi]

It's working. Thank you sir,