ClickHouse/dbms/src/Formats/JSONEachRowRowOutputStream.cpp

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#include <IO/WriteHelpers.h>
#include <IO/WriteBufferValidUTF8.h>
#include <Formats/JSONEachRowRowOutputStream.h>
#include <Formats/FormatFactory.h>
#include <Formats/BlockOutputStreamFromRowOutputStream.h>
namespace DB
{
JSONEachRowRowOutputStream::JSONEachRowRowOutputStream(WriteBuffer & ostr_, const Block & sample, const FormatSettings & settings)
: ostr(ostr_), settings(settings)
{
size_t columns = sample.columns();
fields.resize(columns);
for (size_t i = 0; i < columns; ++i)
{
WriteBufferFromString out(fields[i]);
writeJSONString(sample.getByPosition(i).name, out, settings);
}
}
void JSONEachRowRowOutputStream::writeField(const IColumn & column, const IDataType & type, size_t row_num)
{
writeString(fields[field_number], ostr);
writeChar(':', ostr);
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type.serializeTextJSON(column, row_num, ostr, settings);
++field_number;
}
void JSONEachRowRowOutputStream::writeFieldDelimiter()
{
writeChar(',', ostr);
}
void JSONEachRowRowOutputStream::writeRowStartDelimiter()
{
writeChar('{', ostr);
}
void JSONEachRowRowOutputStream::writeRowEndDelimiter()
{
writeCString("}\n", ostr);
field_number = 0;
}
void registerOutputFormatJSONEachRow(FormatFactory & factory)
{
factory.registerOutputFormat("JSONEachRow", [](
WriteBuffer & buf,
const Block & sample,
const Context &,
const FormatSettings & format_settings)
{
return std::make_shared<BlockOutputStreamFromRowOutputStream>(
std::make_shared<JSONEachRowRowOutputStream>(buf, sample, format_settings), sample);
});
}
}