SQL-DB连接模块的最佳实践

Question

I'm currently trying to improve the sql database module, since we have like 10 different ones that are all slightly different.

I'm wondering now what the best practise is to make this sql connection module as usable as possible. Mainly the search query:

Is

public List<ClassForDatatype> getData(String SQLStatement)

better than

public DataTable getData(String SQLStatement)?

In most places we just want to display the elements we got in a DataGrid. However we also want to use ToString to create an email.

What are your suggestions here?

Answer 1

The first one is the better one. The reason is that your DB layer should have nothing to do with your view layer.

EDIT: You could use your second version, because it would be faster (less calls/conversions etc.). But if you decide at a certin point that you will switch from a DataGrid to something else, you have to rework a lot of code.