<?php
/**
 * Db操作
 */

namespace server\components;
use server\lib\Connection;

class Db {

    private static $_instance;
    private static $_reconnectNum = 3;

    /**
     * 获取实例
     *
     * @param string $configName
     * @return Connection
     * @throws \Exception
     */
    public static function instance($configName = 'customerservice')
    {
        try{
            global $configFile;
            if (empty(self::$_instance[$configName])) {
                echo date('Y-m-d H:i:s')."重新实例化MYSQL.......".PHP_EOL;
                self::$_instance[$configName] = new Connection($configFile['mysql']['host'], $configFile['mysql']['port'],
                $configFile['mysql']['username'], $configFile['mysql']['password'], $configFile['mysql']['dbname'], $configFile['mysql']['charset']);
            }
        }catch (\Exception $e){
            if(self::$_reconnectNum > 0){
                self::$_reconnectNum --;
                usleep(500000);
                if(!empty(self::$_instance[$configName])){
                    self::$_instance[$configName] = '';
                }
                return self::instance();
            }else{
                echo "Mysql连接超时：" . $e->getMessage() . "\n";
            }
        }

        return self::$_instance[$configName];
    }


    /**
     * 关闭数据库实例
     *
     * @param string $configName
     */
    public static function close($configName)
    {
        if (isset(self::$_instance[$configName]) && self::$_instance[$configName] instanceof Connection) {
            self::$_instance[$configName]->closeConnection();
            self::$_instance[$configName] = null;
        }
    }

    /**
     * 关闭所有数据库实例
     */
    public static function closeAll()
    {
        foreach (self::$_instance as $connection) {
            if($connection instanceof Connection)
                $connection->closeConnection();
        }
        self::$_instance = [];
    }
}