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56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#pragma once
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#include <DB/Core/Block.h>
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#include <DB/DataStreams/IRowOutputStream.h>
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namespace DB
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{
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class WriteBuffer;
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/** Поток для вывода данных в формате csv.
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* Не соответствует https://tools.ietf.org/html/rfc4180 потому что использует LF, а не CR LF.
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*/
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class CSVRowOutputStream : public IRowOutputStream
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{
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public:
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/** with_names - выводить в первой строке заголовок с именами столбцов
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* with_types - выводить на следующей строке заголовок с именами типов
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*/
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CSVRowOutputStream(WriteBuffer & ostr_, const Block & sample_, bool with_names_ = false, bool with_types_ = false);
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void writeField(const IColumn & column, const IDataType & type, size_t row_num) override;
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void writeFieldDelimiter() override;
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void writeRowEndDelimiter() override;
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void writePrefix() override;
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void writeSuffix() override;
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void flush() override;
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void setTotals(const Block & totals_) override { totals = totals_; }
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void setExtremes(const Block & extremes_) override { extremes = extremes_; }
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/// https://www.iana.org/assignments/media-types/text/csv
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String getContentType() const override
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{
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return String("text/csv; charset=UTF-8; header=") + ((with_names || with_types) ? "present" : "absent");
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}
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protected:
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void writeTotals();
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void writeExtremes();
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WriteBuffer & ostr;
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const Block sample;
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bool with_names;
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bool with_types;
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DataTypes data_types;
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Block totals;
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Block extremes;
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};
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}
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