Get External list data

Hi,

The scenario is that I have an Employee table in sql database containing more than 5000 items.

Now I want to show the items in webpart based on some column say user country = india and city = mumbai. 

When I connect the table using BCS sharepoint designer and get value in list than I get the whole 5k items if i set limit then some of my items are not populated in sharepoint list.

How can I achieve the above requirement using BCS. Any out of the box solution or custom code.

We use javascript client object model mostly in our webpart

Regards

Md Zakir