Dynamic Table Delete All Binding Context

Hi Expert ;

I use sap.ui.table.DataTable when I call function everytime duplicate table again and again.How can ,ı solve this problem,

There is my controller code,

sap.ui.controller("sap.ui.demo.myFiori.view.Master", {

    onPressSearch: function (evt) {

var oTable = new sap.ui.table.DataTable({

    showNoData : true, 

    columnHeaderHeight : 12,

    width: '100%'

});

        calistir();

     ........//There string process

            rows = JSON.parse(str.toString());

            var oModel = new sap.ui.model.json.JSONModel();

            oModel.setData({modelData: rows});

            oTable.setModel(oModel).bindRows("/modelData");

            oTable.setModel(oModel);

}