55 lines
1.4 KiB
PHP
55 lines
1.4 KiB
PHP
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<?php
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/**
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* 数据库：PDO 单例。
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* 只依赖 config.php 里的 db 配置，方言差异集中在这里。
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*/
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declare(strict_types=1);
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namespace App;
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use PDO;
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final class Database
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{
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/** @var PDO|null */
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private static $pdo = null;
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public static function get(): PDO
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{
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if (self::$pdo instanceof PDO) {
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return self::$pdo;
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}
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$c = $GLOBALS['config']['db'];
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$dsn = sprintf(
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'mysql:host=%s;port=%d;dbname=%s;charset=%s',
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$c['host'],
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$c['port'],
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$c['name'],
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$c['charset']
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);
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self::$pdo = new PDO($dsn, $c['user'], $c['pass'], [
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
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PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
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PDO::ATTR_EMULATE_PREPARES => false,
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]);
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return self::$pdo;
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}
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/** 表是否存在（安装判定用，不依赖异常） */
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public static function hasTables(): bool
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{
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try {
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$st = self::get()->prepare(
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'SELECT COUNT(*) FROM information_schema.tables
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WHERE table_schema = DATABASE() AND table_name IN
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(\'families\',\'persons\',\'accounts\',\'settings\')'
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);
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$st->execute();
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return (int)$st->fetchColumn() === 4;
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} catch (\Throwable $e) {
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return false;
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}
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}
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}
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