创建并连接数据库，并修改登录和注册接口

node_modules/mysql2/lib/promise/pool_connection.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const PromiseConnection = require('./connection.js');
+
+class PromisePoolConnection extends PromiseConnection {
+  constructor(connection, promiseImpl) {
+    super(connection, promiseImpl);
+  }
+
+  destroy() {
+    return this.connection.destroy();
+  }
+
+  async [Symbol.asyncDispose]() {
+    this.release();
+  }
+}
+
+module.exports = PromisePoolConnection;