PHP code example of iliaal / pdo_duckdb

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

iliaal / pdo_duckdb example snippets

$db = new PDO('duckdb:/path/to/analytics.duckdb');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$stmt = $db->prepare('SELECT region, SUM(amount) AS total FROM sales WHERE year = ? GROUP BY region');
$stmt->execute([2026]);
foreach ($stmt as $row) {
    printf("%s: %s\n", $row['region'], $row['total']);
}

// open a database read-only, with a memory cap
$db = new PDO('duckdb:/data/analytics.duckdb;access_mode=read_only;memory_limit=2GB');

// equivalent, via the options array
$db = new PDO('duckdb::memory:', null, null, [
    PDO::DUCKDB_ATTR_CONFIG => ['threads' => 4, 'memory_limit' => '2GB'],
]);

$db->exec('CREATE TABLE events (id INTEGER, name VARCHAR, ts TIMESTAMP)');

$app = $db->duckdbAppender('events');      // optional 2nd arg: schema name
foreach ($rows as $r) {
    $app->appendRow($r['id'], $r['name'], $r['ts']);
}
$app->flush();   // push buffered rows; appender stays open for more rows
$app->close();   // flush + finalize; further append/flush/close throw

$db->exec('CREATE TABLE t (tags VARCHAR[], attrs STRUCT(x INTEGER, y VARCHAR))');
$app = $db->duckdbAppender('t');
$app->appendRow(['php', 'duckdb'], ['x' => 1, 'y' => 'hi']);
$app->flush();

$db->exec("CREATE TABLE events (id BIGINT DEFAULT nextval('seq'), ts TIMESTAMP DEFAULT now(), payload VARCHAR)");
$app = $db->duckdbAppender('events', null, ['payload']);
$app->appendRow('hello')->appendRow('world');   // id and ts fill themselves
$app->flush();

// Tables a query references, resolved by DuckDB's parser (read queries only;
// DML returns []). Pass true to kdbTableNames('SELECT * FROM s.orders', true);   // ['s.orders']

// Profiling tree of the last executed query. Enable profiling first; the method
// reads the recorded profile and runs nothing itself. Returns null until then.
$db->exec("PRAGMA enable_profiling='no_output'");
$db->query('SELECT count(*) FROM events WHERE ts > now() - INTERVAL 1 DAY');
$profile = $db->duckdbLastProfile();
// ['metrics' => ['QUERY_NAME' => '…', 'LATENCY' => '0.004', …],
//  'children' => [ ['metrics' => ['OPERATOR_NAME' => 'SEQ_SCAN', …], 'children' => […]] ]]

$db->exec('LOAD json');                     // bundled extensions load offline
$db->exec('INSTALL httpfs; LOAD httpfs;');  // downloadable extensions

  $db->setAttribute(PDO::DUCKDB_ATTR_UNBUFFERED, true);
  

ini
extension=pdo_duckdb