创建并连接数据库，并修改登录和注册接口

node_modules/mysql2/lib/promise/capture_local_err.js

@@ -0,0 +1,25 @@
+'use strict';
+
+/** @param {Function} constructorOpt Passed to Error.captureStackTrace (omit this frame from stacks). */
+function captureStackHolder(constructorOpt) {
+  const holder = {};
+  Error.captureStackTrace(holder, constructorOpt);
+  return holder;
+}
+
+/**
+ * Replace `err.stack` frames with the capture from `holder`, keeping the
+ * callback error instance and its MySQL fields.
+ *
+ * @param {Error} err
+ * @param {{ stack?: string }} holder
+ */
+function applyCapturedStack(err, holder) {
+  const stack = holder && holder.stack;
+  if (typeof stack !== 'string' || !stack) return;
+  const lines = stack.split('\n');
+  lines[0] = `${err.name}: ${err.message}`;
+  err.stack = lines.join('\n');
+}
+
+module.exports = { captureStackHolder, applyCapturedStack };