store
var store = new Ext.data.Store({
  autoLoad: true,
  autoSync: true,
  autoSave: true,
  batch : true,
  model: 'Plant',
	proxy: 
	{
        type: 'ajax',
        url: '111.php',
	    reader: 
		{
        	type: 'json',
                root: 'data'		
        },		
		writer: 
		   {
	            type: 'json',
	            root: 'data'
	        }
    },

grid.reconfigure(store);
grid.refresh()

var refreshAction = Ext.create('Ext.Action', 
	{
        text: 'Refresh',
		weight:150,
		height:28,
              handler: function(widget, event) 
		{	
			//this.grid.refresh();
			//grid.reconfigure(store);
			//grid.onRefresh(store)
			//grid.reload(store);
			store.getView().refresh();
		}
	});

ALTER PROCEDURE [dbo].[sp_123]
	@ID int,
	@FIO varchar(50) = null, 
AS
begin
  set nocount on;
Update dbo.v_123
set FIO=@FIO 
where (ID=@ID)

grid.SelectedRow(@ID); 
grid.SelectedRow(@FIO); 

var store = new Ext.data.Store({
  autoLoad: true,
  autoSync: true,
  model: 'Plant',
	proxy: 
	{
        type: 'ajax',
        url: 'data.php',
	    reader: 
		{
        	type: 'json',
                root: 'data'		
        },		
		writer: 
		   {
	            type: 'json',
	            root: 'data'
	        }
    },

$sql_update = "select @ID, @FIO from MyStoreProc"

var store = new Ext.data.Store({
  autoLoad: true,
  autoSync: true,
  model: 'Plant',
	proxy: 
	{
        type: 'ajax',
        url: 'data.php',
	    reader: 
		{
        	type: 'json',
                root: 'data'		
        },
        type: 'ajax',
        url: 'data_upd.php',	
		writer: 
		   {
	            type: 'json',
	            root: 'data'
	        }
    },

var rec_upd = grid.getSelectionModel().getSelection()[0];
  if (rec_upd) 
	{
	 grid.SelectedRow('ID')=@ID,
         grid.SelectedRow('FIO')=@FIO,
	}

<?php
$aa = array();
$server = 'server';
$link = mssql_connect($server, '122', '122');

if (!$link) {
    die('Something went wrong while connecting to MSSQL');
}

mssql_select_db ('database', $link);

$sql_update = "exec dbo.sp_123
@MachineID=[ResourceID], 
@FIO=[FIO]";

$result = mssql_query($sql);

//while ($row = mssql_fetch_assoc($result)) 
//	{
	  $output[]=$row;
//    }
	$aa['data']=$output;
	$aa['success']=true;
	$result = json_encode($aa);
    echo $result;	
?> 

....
constructor ...
.....
var store = new Ext.data.JsonStore({
  autoLoad: true,
  autoSync: true,
  model: 'Plant',
  proxy: 
 {
        url: 'data_upd.php'
  }
 handler: function() 
{
 var rec_upd = grid.getSelectionModel().getSelection()[0];
  if (rec_upd) 
	{
	 grid.SelectedRow('ID')=@ID,
         grid.SelectedRow('FIO')=@FIO
	}
}}

<?php
$aa = array();
$server = 'server';
$link = mssql_connect($server, '122', '122');
if (!$link) {
    die('Something went wrong while connecting to MSSQL');
}
mssql_select_db ('database', $link);

$sql_update = "exec dbo.sp_123
@MachineID=[ResourceID],   может здесь поля в ' ' или ()  ??
@FIO=[FIO]";

$result = mssql_query($sql);

//while ($row = mssql_fetch_assoc($result)) 
//	{
	  $output[]=$row;
//    }
        $aa['data']=$result;
	$aa['success']=true;
	$result = json_encode($aa);
//    echo $result;	
?>