private QueryNode ParseQueryWithOptionalCTE()
{
EnableQueryKeywords();
if (_token.Id != TokenId.WITH)
{
return(ParseQuery());
}
else
{
NextToken();
CommonTableExpressionQuery commonTableExpressionQuery = new CommonTableExpressionQuery();
List <CommonTableExpression> commonTableExpressions = new List <CommonTableExpression>();
while (_token.Id != TokenId.Eof)
{
CommonTableExpression commonTableExpression = ParseCommonTableExpression();
commonTableExpressions.Add(commonTableExpression);
if (_token.Id != TokenId.Comma)
{
break;
}
NextToken();
}
commonTableExpressionQuery.CommonTableExpressions = commonTableExpressions.ToArray();
commonTableExpressionQuery.Input = ParseQuery();
return(commonTableExpressionQuery);
}
}
public override AstElement Clone(Dictionary<AstElement, AstElement> alreadyClonedElements)
{
CommonTableExpression result = new CommonTableExpression();
result.TableName = _tableName;
result.TableNameSourceRange = _tableNameSourceRange;
result.ColumnNames = (Identifier[]) _columnNames.Clone();
result.QueryDeclaration = (QueryNode)_queryDeclaration.Clone(alreadyClonedElements);
result.CommonTableBinding = _commonTableBinding;
return result;
}
public override AstElement Clone(Dictionary <AstElement, AstElement> alreadyClonedElements)
{
CommonTableExpression result = new CommonTableExpression();
result.TableName = _tableName;
result.TableNameSourceRange = _tableNameSourceRange;
result.ColumnNames = (Identifier[])_columnNames.Clone();
result.QueryDeclaration = (QueryNode)_queryDeclaration.Clone(alreadyClonedElements);
result.CommonTableBinding = _commonTableBinding;
return(result);
}
private CommonTableExpression ParseCommonTableExpression()
{
CommonTableExpression commonTableExpression = new CommonTableExpression();
_rangeRecorder.Begin();
commonTableExpression.TableName = ParseIdentifier();
commonTableExpression.TableNameSourceRange = _rangeRecorder.End();
if (_token.Id == TokenId.LeftParentheses)
{
NextToken();
List <Identifier> columnNames = new List <Identifier>();
while (_token.Id != TokenId.Eof)
{
Identifier columnName = ParseIdentifier();
if (columnName == null)
{
break;
}
columnNames.Add(columnName);
if (_token.Id != TokenId.Comma)
{
break;
}
NextToken();
}
commonTableExpression.ColumnNames = columnNames.ToArray();
Match(TokenId.RightParentheses);
}
Match(TokenId.AS);
Match(TokenId.LeftParentheses);
commonTableExpression.QueryDeclaration = ParseQuery();
Match(TokenId.RightParentheses);
return(commonTableExpression);
}
private CommonTableExpression ParseCommonTableExpression()
{
CommonTableExpression commonTableExpression = new CommonTableExpression();
_rangeRecorder.Begin();
commonTableExpression.TableName = ParseIdentifier();
commonTableExpression.TableNameSourceRange = _rangeRecorder.End();
if (_token.Id == TokenId.LeftParentheses)
{
NextToken();
List<Identifier> columnNames = new List<Identifier>();
while (_token.Id != TokenId.Eof)
{
Identifier columnName = ParseIdentifier();
if (columnName == null)
break;
columnNames.Add(columnName);
if (_token.Id != TokenId.Comma)
break;
NextToken();
}
commonTableExpression.ColumnNames = columnNames.ToArray();
Match(TokenId.RightParentheses);
}
Match(TokenId.AS);
Match(TokenId.LeftParentheses);
commonTableExpression.QueryDeclaration = ParseQuery();
Match(TokenId.RightParentheses);
return commonTableExpression;
}
private void ValidateColumnNames(SelectColumn[] columns, CommonTableExpression commonTableExpression)
{
if (commonTableExpression.ColumnNames == null)
{
// Check that all columns have aliases.
for (int i = 0; i < columns.Length; i++)
{
SelectColumn selectColumn = columns[i];
if (selectColumn.Alias == null)
ErrorReporter.NoColumnAliasSpecified(commonTableExpression.TableNameSourceRange, i, commonTableExpression.TableName);
}
}
else
{
if (commonTableExpression.ColumnNames.Length < columns.Length)
ErrorReporter.CteHasMoreColumnsThanSpecified(commonTableExpression.TableName);
else if (commonTableExpression.ColumnNames.Length > columns.Length)
ErrorReporter.CteHasFewerColumnsThanSpecified(commonTableExpression.TableName);
else
{
// Check that all specified column names are unique.
Dictionary<string, object> nameSet = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
foreach (Identifier columnName in commonTableExpression.ColumnNames)
{
if (nameSet.ContainsKey(columnName.Text))
ErrorReporter.CteHasDuplicateColumnName(columnName, commonTableExpression.TableName);
else
nameSet.Add(columnName.Text, null);
}
}
if (!ErrorReporter.ErrorsSeen)
{
// Write explictly given column names into the real column list as aliases.
for (int i = 0; i < columns.Length; i++)
columns[i].Alias = commonTableExpression.ColumnNames[i];
}
}
}
