a725f0f933
- Complete expansion guide for 2/4/6 node scenarios - Quick join scripts for worker and master nodes - Health check and diagnostic scripts - Quick reference card for common operations
23 lines
751 B
PHP
23 lines
751 B
PHP
<?php
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require_once 'config.php';
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class Database {
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private static ?PDO $instance = null;
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public static function getConnection(): PDO {
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if (self::$instance === null) {
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try {
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$dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;
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self::$instance = new PDO($dsn, DB_USER, DB_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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} catch (PDOException $e) {
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die("数据库连接失败: " . $e->getMessage());
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}
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}
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return self::$instance;
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}
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}
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