protected virtual Expression VisitOrderBy(SqlOrderByExpression orderByExpression)
{
var newExpression = this.Visit(orderByExpression.Expression);
if (newExpression != orderByExpression.Expression)
{
return(new SqlOrderByExpression(orderByExpression.OrderType, newExpression));
}
return(orderByExpression);
}
protected override Expression VisitOrderBy(SqlOrderByExpression orderByExpression)
{
base.VisitOrderBy(orderByExpression);
switch (orderByExpression.OrderType)
{
case OrderType.Ascending:
this.Write(" NULLS FIRST");
break;
default:
this.Write(" NULLS LAST");
break;
}
return(orderByExpression);
}
protected override SqlExpression Visit(SqlOrderByExpression expression)
{
sql.Append(string.Join(", ", expression.Columns.Select(FormatOrdering)));
return(expression);
}
protected virtual SqlExpression Visit(SqlOrderByExpression expression)
{
return(new SqlOrderByExpression(expression.Columns.Select(x => (SqlOrderingExpression)Visit(x))));
}
