public string ToSqlQuery(IList <Type> model = null)
{
string op;
switch (this.op)
{
case Operator.Equals: op = "="; break;
case Operator.NotEquals: op = "<>"; break;
case Operator.Like: op = "LIKE"; break;
default: throw new NotImplementedException("Unknown sql operator " + this.op.ToString());
}
return(string.Format("({0} {1} {2})", lhs.ToSqlQuery(model), op, rhs.ToSqlQuery(model)));
}