Examples

Reading

Description

from_csv() with its options spelled out. Left out, the separator, enclosure and escape are detected from the file, and with no schema given, the column types are inferred from a sample.

Documentation

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

Data Retrieval
CSV Adapter

Code

<?php

declare(strict_types=1);

use function Flow\ETL\Adapter\CSV\from_csv;
use function Flow\ETL\DSL\{data_frame, to_output};

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

data_frame()
    ->read(from_csv(
        __DIR__ . '/data/orders.csv',
        with_header: true,
        empty_to_null: true,
        separator: ',',
        enclosure: '"',
        escape: '\\'
    ))
    ->select('order_id', 'created_at', 'customer')
    ->limit(3)
    ->collect()
    ->write(to_output(truncate: false))
    ->run();

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