ClickHouse/dbms/include/DB/DataStreams/TabSeparatedRowOutputStream.h
2017-04-01 11:35:09 +03:00

50 lines
1.4 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#pragma once
#include <DB/Core/Block.h>
#include <DB/DataStreams/IRowOutputStream.h>
namespace DB
{
class WriteBuffer;
/** Поток для вывода данных в формате tsv.
*/
class TabSeparatedRowOutputStream : public IRowOutputStream
{
public:
/** with_names - выводить в первой строке заголовок с именами столбцов
* with_types - выводить на следующей строке заголовок с именами типов
*/
TabSeparatedRowOutputStream(WriteBuffer & ostr_, const Block & sample_, bool with_names_ = false, bool with_types_ = false);
void writeField(const IColumn & column, const IDataType & type, size_t row_num) override;
void writeFieldDelimiter() override;
void writeRowEndDelimiter() override;
void writePrefix() override;
void writeSuffix() override;
void flush() override;
void setTotals(const Block & totals_) override { totals = totals_; }
void setExtremes(const Block & extremes_) override { extremes = extremes_; }
/// https://www.iana.org/assignments/media-types/text/tab-separated-values
String getContentType() const override { return "text/tab-separated-values; charset=UTF-8"; }
protected:
void writeTotals();
void writeExtremes();
WriteBuffer & ostr;
const Block sample;
bool with_names;
bool with_types;
Block totals;
Block extremes;
};
}