Examples

Reading

Description

from_json_lines() reads JSON Lines: one JSON object per line, read line by line, so the file never has to fit in memory.

Documentation

Readers are extractors: they yield Rows and describe the schema they produce.

Data Retrieval
JSON Adapter

Code

<?php

declare(strict_types=1);

use function Flow\ETL\Adapter\JSON\from_json_lines;
use function Flow\ETL\DSL\{data_frame, to_output};

require __DIR__ . '/vendor/autoload.php';

data_frame()
    ->read(from_json_lines(__DIR__ . '/data/orders.jsonl'))
    ->select('order_id', 'created_at', 'customer')
    ->limit(3)
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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