<?php
/** PDO-Verbindung zur Terminal-Datenbank (Singleton). */
function term_db(): PDO
{
    static $pdo = null;
    if ($pdo instanceof PDO) {
        return $pdo;
    }
    $c = TERM_DB;
    $dsn = sprintf('mysql:host=%s;dbname=%s;charset=%s', $c['host'], $c['name'], $c['charset']);
    $pdo = new PDO($dsn, $c['user'], $c['pass'], [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_EMULATE_PREPARES   => false,
    ]);
    return $pdo;
}

/** Voll qualifizierter Tabellenname inkl. Präfix. */
function term_tbl(string $name): string
{
    return TERM_PREFIX . $name;
}