/**
 * 数据库连接配置
 */

require('dotenv').config();
const mysql = require('mysql2/promise');

// 数据库连接池配置
const pool = mysql.createPool({
    host: process.env.DB_HOST,
    port: process.env.DB_PORT || 3306,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_DATABASE,
    waitForConnections: true,
    connectionLimit: 10,
    queueLimit: 0,
    enableKeepAlive: true,
    keepAliveInitialDelay: 0
});

// 测试数据库连接
pool.getConnection()
    .then(connection => {
        console.log('✅ 数据库连接成功');
        connection.release();
    })
    .catch(err => {
        console.error('❌ 数据库连接失败:', err.message);
    });

module.exports = pool;