public override void EnterOrderByStmt(SelectSQLParser.OrderByStmtContext context)
{
var orderBy = new OrderByCondition();
var expression = context.columnExpression();
if (expression == null || expression.IsEmpty)
{
throw new MissingOrderByException();
}
orderBy.Expression = expression.GetText();
if (string.IsNullOrEmpty(orderBy.Expression))
{
throw new MissingOrderByException();
}
orderBy.Direction = OrderByDirection.DESC;
var direction = context.orderByDirection();
if (direction == null || direction.IsEmpty)
{
orderBy.Direction = OrderByDirection.ASC;
}
else if (direction.GetText().Equals("asc", StringComparison.OrdinalIgnoreCase))
{
orderBy.Direction = OrderByDirection.ASC;
}
this.SelectStmt.OrderBy.Add(orderBy);
}
/// <summary>
/// Visit a parse tree produced by <see cref="SelectSQLParser.orderByStmt"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitOrderByStmt([NotNull] SelectSQLParser.OrderByStmtContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="SelectSQLParser.orderByStmt"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitOrderByStmt([NotNull] SelectSQLParser.OrderByStmtContext context)
{
}