添加 MySQL连接是否enbale的配置处理

src/lib/Database/MySQLConnection.ts

@@ -12,6 +12,10 @@ class MySQLConnectPool {
     private logger = new Logger('MySQLConnection');
 
     constructor() {
+        if(!config.mysql.enable){
+            this.logger.warn('Database is disabled, initialization terminated');
+            return;
+        }
         this.pool = this.createConnectPool();
         this.logger.info("Database connection pool created")
         setTimeout(async () => {