angular js page modify data stored in the database

First, write service, modify the data to echo data based on ID

　　// query by ID 
    public Brand findById (Long the above mentioned id); 
    // modify 
    public int update (Brand brand); 
Second, write serviceImpl

@Override 
public the findById Brand (Long ID) { 
    return brandDao.selectByPrimaryKey (ID); 
} 

@Override 
public int Update (Brand Brand) { 
    return brandDao.updateByPrimaryKeySelective (Brand); 
} 
three Controller write, modify return type Result

//根据ID查询回显数据
//    @RequestMapping("/findById")
    @RequestMapping("/{id}")
//    public Brand findById(Long id){
    public Brand findById(@PathVariable(value = "id")Long id){
        return brandService.findById(id);
    }
    //修改
    @RequestMapping("/update")
    public Result update(@RequestBody Brand brand){
        int id = brandService.update(brand);
        if (id>0){
            return new Result(true,"修改成功");
        }else {
            return new Result(false,"修改失败");
        }
    }

Fourth, write html page

// Add save 
$ scope.save = function () { 
   var URL = "../ Brand / save.do"; 
  // determines whether to add or modify, add $ scope.entity.id == null, modified or executed
    if ($ scope.entity.id! = null) { 
      URL = "../ Brand / update.do" 
   } 
  // send request $ http.post (url, $ scope.entity) , the first parameter is the request address, the second parameter is the data submitted
    $ http.post (URL, $ scope.entity) .success (function (Response) { 
      IF (response.success) { 
         // reloaded 
         return $ scope.reloadList (); 
      } the else { 
         Alert (response.message); 
      } 
   }); 
} 
// The ID data echo
 $ scope.findById = function (ID) { 
   // $ http.get ( '../ Brand / findById.do ID =?' + id) .success (function (response) {
   $http.get('../brand/'+id+'.do').success(function (response) {
      $scope.entity=response;
   });
}

<td class="text-center">
   <button type="button" class="btn bg-olive btn-xs" data-toggle="modal"
         data-target="#editModal" ng-click="findById(entity.id)" >修改</button>
</td>

// ng-click = "save ()", the address is determined according to a request calling save

<button class="btn btn-success" data-dismiss="modal" aria-hidden="true" ng-click="save()">保存</button>