如何在CDK应用中获取RDS实例主机名？

import * as cdk from 'aws-cdk-lib';
import * as rds from 'aws-cdk-lib/aws-rds';

export class MyCdkApp extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // 创建RDS实例
    const rdsInstance = new rds.DatabaseInstance(this, 'MyRdsInstance', {
      // 配置RDS实例的属性
      // ...
    });

    // 获取RDS实例主机名
    const rdsHostname = rdsInstance.instanceEndpoint.hostname;
    console.log(`RDS实例主机名：${rdsHostname}`);
  }
}

const app = new cdk.App();
new MyCdkApp(app, 'MyCdkApp');
app.synth();