Yii: Sorting and formatting dynamic columns - sql-server

Question

I am showing data in CGridView from a dynamic SQL Query using CSqlDataProvider. There are some static and some dynamic column. Now I want to do some special formatting like currency in the dynamic columns. But how do I do that when I don't know the number/name of the columns till the query is executed.
Also i want to be able to sort the dynamic columns and again I have the same problem that I don't have all the column names.
Anyone before who worked with dynamic queries and gridview. Could please point me to the right direction or give some ideas how to do it.
In short I am able to successfully show the data in gridview(also dynamic rows) and sort all the static columns. Just need to sort dynamic rows and format dynamic & static columns
Code for GridView:
$tdata=$dataProvider->getData();
//Calculation to get column names
$grid_columns = array_keys($tdata[0]);
foreach($grid_columns as $i=>$ii)
{
//Applying Formula to get Total Row
$grid_final[$i] = array('name'=>$ii,'class'=>'bootstrap.widgets.TbTotalSumColumn');
}
//Grid View
$this->widget('bootstrap.widgets.TbExtendedGridView', array(
'sortableRows'=>true,
'afterSortableUpdate' => 'js:function(id, position){ console.log("id: "+id+", position:"+position);}',
'dataProvider'=>$dataProvider,
'type'=>'striped bordered',
'template' => "{items}\n{extendedSummary}",
'columns'=> $grid_final,
));
Controller Code:
public function actionIndex()
{
if(isset($_GET['month']))
{
$month=$_GET['month'];
}
else
{
$month= 7;
}
//SQL Query with Dynamic Columns
$sql = "SELECt ABC,X,Y,Z, #Column_Names
FROM some_table
WHERE [month] = :month";
$connection=Yii::app()->db;
$command=$connection->createCommand($sql);
$command->bindParam(':month',$month,PDO::PARAM_STR);
$dataProvider=new CSqlDataProvider($sql,array('keyField' => 'ABC','params' => array(
':month' => $month,
),'sort' => array(
//Here how do i put column names which i don't know yet for sorting
'attributes' => array(
'ABC','X','Y','Z' )),'pagination'=>false));
$this->render('index',array('dataProvider' => $dataProvider, 'month' => $month));
}

Answer 1

I create dynamic columns in Yii like this:
In some_table model, let's name it SomeTable, I declare a maximum number of column names like this:
public $column1, $column2, $column3, $column4;
I create a function in that model, let's name it 'search()' that builds the dataProvider, like your logic states, but I make sure that #Column_Names looks like something like this:
var_column1 as column1, var_column2 as column2, etc.
in validation(), declare all those columns as safe on 'search'
construct a columns array formed from merging model->attributes and all declared columns with their options and assign it to the view, exactly like you do with $grid_final variable
The only drawback here is that you need to know the maximum number of columns, and of course, the big problem of declaring allot of variables if you have tables with allot of columns.

Answer 2

If you are able to get the columns before the grid is rendered, you can also alter the sorting conditions of the dataprovider.
Something like this:
$tdata=$dataProvider->getData();
//Calculation to get column names
$grid_columns = array_keys($tdata[0]);
$dataProvider->setSort(array('attributes'=> $grid_columns));
Or you can of course prepare you own array of attributes with specific settings, or specific formatting according to any logic you have. The thing is - once you have the columns in $grid_columns you can alter the dataProvider sorting, or the gridColumn setting as you need.