Create/Use User-defined functions in System.Data.SQLite?

Question

User-Defined Functions & Collating Sequences Full support for user-defined functions and collating sequences means that in many cases if SQLite doesn\'t

Answer 1

Robert Simpson has a great example of a REGEX function you can use in your sqlite queries:

// taken from http://sqlite.phxsoftware.com/forums/p/348/1457.aspx#1457
[SQLiteFunction(Name = "REGEXP", Arguments = 2, FuncType = FunctionType.Scalar)]
class MyRegEx : SQLiteFunction
{
   public override object Invoke(object[] args)
   {
      return System.Text.RegularExpressions.Regex.IsMatch(Convert.ToString(args[1]),Convert.ToString(args[0]));
   }
}

// example SQL:  SELECT * FROM Foo WHERE Foo.Name REGEXP '$bar'