sinks.hpp File Reference

Writers for batches: JSON Lines, and CSV flattened from a result's JSON. Both can be given to for_each_batch() as the sink. More...

#include <concepts>
#include <cstddef>
#include <cstdint>
#include <ostream>
#include <stdexcept>
#include <string>
#include <string_view>
#include <unordered_map>
#include <utility>
#include <vector>

Go to the source code of this file.

Classes
class	dasmig::core::detail::json_flattener
class	dasmig::core::jsonl_writer
	Writes one JSON document per line (JSON Lines / NDJSON). More...
class	dasmig::core::csv_writer
	Writes results as CSV, one row each, with columns flattened from their JSON (see flatten_json()). More...

Concepts
concept	dasmig::core::json_result
	Whether a result has to_json() returning text.

Functions
std::vector< std::pair< std::string, std::string > >	dasmig::core::flatten_json (std::string_view json)
	Flatten a JSON document into dotted columns.

Detailed Description

Writers for batches: JSON Lines, and CSV flattened from a result's JSON. Both can be given to for_each_batch() as the sink.

Author

Diego Dasso Migotto (diegomigotto at hotmail dot com)

Definition in file sinks.hpp.

Function Documentation

flatten_json()

std::vector< std::pair< std::string, std::string > > dasmig::core::flatten_json ( std::string_view  json )

inline

Flatten a JSON document into dotted columns.

An object's members become parent.child cells, strings are unescaped, numbers and booleans keep their text, null is an empty cell, and an array (or an empty nested object) is one cell holding its JSON text. A document that is not an object gives one cell with an empty name.

Parameters

json	A complete JSON document.

Returns

The (column, cell) pairs in document order.

Exceptions

std::invalid_argument

If json is not valid JSON.

Definition at line 280 of file sinks.hpp.