Generic Repository with Data Access Layer

I am creating a new project using business objects (Employee, Product). Due to constraints, I am not using LINQ to SQL or any ORM Mapper.

I have to hand code the Data Access Layer(s). I am interested in using the 'Repository Pattern'.

According to what I understand, I have to create a generic repository IRepository which is implemented by all repositories ProductRepository, EmployeeRepository.

What confuses me is that different business objects have different requirements. For example:

ProductRepository

 GetAllProducts ();
 GetProductById (int id);
 GetProductByMaxPrice (double price);
 GetProductByNamePrice (string name, double Price);
 Get... (...);

EmployeeRepository

 GetEmployeeByAge ();
 GetEmployeeByJob (string description);
 GetEmployeeBySalary (double salary);
 Get... (...); //and so on

How can I create a generic repository which meets different data access requirements of different objects?

I have read a lot of theory regarding Repository Pattern but would really appreciate a working example.

Additionally, if I can create all repositories using a generic repository, using the factory pattern becomes easy aswell. For example:

interface IRepository
{
    ....
}

ProductRepository : IRepository
{
    ....
}

EmployeeRepository : IRepository
{
    ....
}

Then we can use the factory pattern effectively as:

IRepository repository;
repository = new ProductRepository ();
repository.Call_Product_Methods ();

repository = new EmployeeRepository ();
repository.Call_Employee_Methods ();