public override AstElement Clone(Dictionary<AstElement, AstElement> alreadyClonedElements)
{
TopClause result = new TopClause();
result.Value = _value;
result.WithTies = _withTies;
return result;
}
public override AstElement Clone(Dictionary <AstElement, AstElement> alreadyClonedElements)
{
TopClause result = new TopClause();
result.Value = _value;
result.WithTies = _withTies;
return(result);
}
private QueryNode ParseSelectQuery()
{
if (_token.Id == TokenId.LeftParentheses)
{
NextToken();
QueryNode result = ParseQuery();
Match(TokenId.RightParentheses);
return result;
}
if (!Match(TokenId.SELECT))
return null;
SelectQuery selectQuery = new SelectQuery();
// DISTINCT
if (_token.Id == TokenId.DISTINCT)
{
selectQuery.IsDistinct = true;
NextToken();
}
// TOP
if (_token.Id == TokenId.TOP)
{
NextToken();
TopClause topClause = new TopClause();
topClause.Value = (int)ParseInteger();
if (_token.Id == TokenId.WITH)
{
NextToken();
Match(TokenId.TIES);
topClause.WithTies = true;
}
selectQuery.TopClause = topClause;
}
// SelectColumns
selectQuery.SelectColumns = ParseColumnSources();
// FROM
if (_token.Id == TokenId.FROM)
{
NextToken();
selectQuery.TableReferences = ParseTableReferences();
}
// WHERE
if (_token.Id == TokenId.WHERE)
{
NextToken();
selectQuery.WhereClause = ParseExpression();
}
// GROUP BY
if (_token.Id == TokenId.GROUP)
{
NextToken();
Match(TokenId.BY);
selectQuery.GroupByColumns = ParseExpressions();
}
// HAVING
if (_token.Id == TokenId.HAVING)
{
NextToken();
selectQuery.HavingClause = ParseExpression();
}
return selectQuery;
}
private QueryNode ParseSelectQuery()
{
if (_token.Id == TokenId.LeftParentheses)
{
NextToken();
QueryNode result = ParseQuery();
Match(TokenId.RightParentheses);
return(result);
}
if (!Match(TokenId.SELECT))
{
return(null);
}
SelectQuery selectQuery = new SelectQuery();
// DISTINCT
if (_token.Id == TokenId.DISTINCT)
{
selectQuery.IsDistinct = true;
NextToken();
}
// TOP
if (_token.Id == TokenId.TOP)
{
NextToken();
TopClause topClause = new TopClause();
topClause.Value = (int)ParseInteger();
if (_token.Id == TokenId.WITH)
{
NextToken();
Match(TokenId.TIES);
topClause.WithTies = true;
}
selectQuery.TopClause = topClause;
}
// SelectColumns
selectQuery.SelectColumns = ParseColumnSources();
// FROM
if (_token.Id == TokenId.FROM)
{
NextToken();
selectQuery.TableReferences = ParseTableReferences();
}
// WHERE
if (_token.Id == TokenId.WHERE)
{
NextToken();
selectQuery.WhereClause = ParseExpression();
}
// GROUP BY
if (_token.Id == TokenId.GROUP)
{
NextToken();
Match(TokenId.BY);
selectQuery.GroupByColumns = ParseExpressions();
}
// HAVING
if (_token.Id == TokenId.HAVING)
{
NextToken();
selectQuery.HavingClause = ParseExpression();
}
return(selectQuery);
}