Dynamic Column show/hide from saved state

Hi,

I am trying to show/hide columns in the datatable using the state information stored in a database.

When the user hides few columns, and saves the information in the database using some profile name.

Later, when the user selects one of the saved profile names, from a dropdown, I need to -
1. Load the new state information from the database. How can I trigger the load state event?
2. How can I update the table with state information

I am able to do the save information. However, I am having trouble loading the saved state information.

I am using jquery.dataTables.js 1.10.6

stateLoadCallback: function (settings) {
                    var o;
                    //Get the selected profile name from the drop-down
                    var profile_value = $("#selected_profile_name" ).val();
                    if(profile_value != null){
                        var url = "/state/"+user_name+"/"+table_id+"/profile1";
                        $.ajax({
                          "url": url,
                          "dataType": "json",
                          "type": "GET",
                          "async":false
                        }).done(function ( data ) {
                              o = JSON.parse(data);
                              console.log('In done of stateLoadCallback'+data);
                        }).fail(function ( data ) {
                          console.log('In fail of stateLoadCallback'+data);
                        });
                      return o;
                    }
                }

Thanks