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51 lines
1.0 KiB
C++
51 lines
1.0 KiB
C++
#pragma once
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#include <Poco/SharedPtr.h>
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#include <DB/Core/Block.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/WriteBufferValidUTF8.h>
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#include <DB/DataStreams/IRowOutputStream.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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namespace DB
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{
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/** Поток для вывода данных в формате JSON.
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*/
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class JSONRowOutputStream : public IRowOutputStream
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{
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public:
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JSONRowOutputStream(WriteBuffer & ostr_, const Block & sample_);
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void writeField(const Field & field);
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void writeFieldDelimiter();
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void writeRowStartDelimiter();
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void writeRowEndDelimiter();
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void writePrefix();
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void writeSuffix();
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void setRowsBeforeLimit(size_t rows_before_limit_)
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{
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applied_limit = true;
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rows_before_limit = rows_before_limit_;
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}
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protected:
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void writeRowsBeforeLimitAtLeast();
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typedef std::vector<NameAndTypePair> NamesAndTypesVector;
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WriteBufferValidUTF8 ostr;
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size_t field_number;
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size_t row_count;
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bool applied_limit;
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size_t rows_before_limit;
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NamesAndTypesVector fields;
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};
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}
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