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ServiceStack OrmLite - using String type for > and < expressions

I have the following POCO class, where Date is defined as a string and will always conform to the following format 'yyyyMMdd'

public class Price {
    [AutoIncrement]
    public int Id {get;set;}

    public string Date {get;set;}
    public decimal Price {get;set;}
}

I would like to run a OrmLite query using Linq which retrieves all prices with a date greater or equal to a certain request string PriceDateGreaterThan parameter.

ie.

var prices = Db.Select<Price>().Where(ar => ar.PriceDate >= request.PriceDateGreaterThan).ToList();

Given PriceDate & PriceDateGreaterThan are both of type string (& not int or DateTime), how can I run this query using OrmLite?

Solution

  • As .NET's BCL doesn't define comparison operators for String (e.g. <=,<,>,=>) you can't use a typed API for this so you'd need to use custom SQL, e.g:

    var q = Db.From<Price>();
q.Where(q.Column<Price>(x => x.Date) + " >= {0}", priceDateGreaterThan);

var prices = db.Select(q);