mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-22 17:50:47 +00:00
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#pragma once
|
|
|
|
#include <Poco/SharedPtr.h>
|
|
|
|
#include <DB/Core/Block.h>
|
|
#include <DB/IO/WriteBuffer.h>
|
|
#include <DB/IO/WriteBufferValidUTF8.h>
|
|
#include <DB/DataStreams/IRowOutputStream.h>
|
|
#include <DB/DataStreams/IProfilingBlockInputStream.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/** Поток для вывода данных в формате JSON.
|
|
*/
|
|
class JSONRowOutputStream : public IRowOutputStream
|
|
{
|
|
public:
|
|
JSONRowOutputStream(WriteBuffer & ostr_, const Block & sample_);
|
|
|
|
void writeField(const Field & field);
|
|
void writeFieldDelimiter();
|
|
void writeRowStartDelimiter();
|
|
void writeRowEndDelimiter();
|
|
void writePrefix();
|
|
void writeSuffix();
|
|
|
|
void setRowsBeforeLimit(size_t rows_before_limit_)
|
|
{
|
|
applied_limit = true;
|
|
rows_before_limit = rows_before_limit_;
|
|
}
|
|
|
|
void setTotals(const Block & totals_) { totals = totals_; }
|
|
void setExtremes(const Block & extremes_) { extremes = extremes_; }
|
|
|
|
protected:
|
|
|
|
void writeRowsBeforeLimitAtLeast();
|
|
virtual void writeTotals();
|
|
virtual void writeExtremes();
|
|
|
|
typedef std::vector<NameAndTypePair> NamesAndTypesVector;
|
|
|
|
WriteBufferValidUTF8 ostr;
|
|
size_t field_number;
|
|
size_t row_count;
|
|
bool applied_limit;
|
|
size_t rows_before_limit;
|
|
NamesAndTypesVector fields;
|
|
Block totals;
|
|
Block extremes;
|
|
};
|
|
|
|
}
|
|
|