Question

Hi I would like to know how to create a dll that is written in say, c# that gets data from the columns of MYSQL database that is hosted online, so i am bit a confused as the data in MYSQL gets updated very often how to ensure that dll is pulling the information?

I am very new to creating dll never have it done before.

Tks

Answer 1

Once you have got your windows class libarary set up. You need to decide what data the dll needs to give your calling application/s. You then need to expose these methods in the dll so that you can call them when needed. You should use Interfaces for these methods

namespace ProductExampleInterfaces
{

    public interface IProductData
    {
        IList<Product> GetAllProducts();
        string GetProductName(int id);
        ...
    }
    ...
}

The above interface would be used in your calling application as following

using MySqlExmpleDll;
...

class ProductService
{
    private IProductData _productData;

    public ProductService(IProductData productData)
    {
        _productData = productData;
    }

    public IList<Product> GetAllProducts()
    {
        IList<Product> products;
        products = _productData.GetAllProducts();
        ...
        return products;
    }

}

Now, if GetAllProducts() is returning data then you know you are on track.