当我在angular中请求数据库时，在我的数据列表上显示一条消息

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DatabaseService {
  private apiUrl = 'http://example.com/api/data'; // 替换为实际的数据库API端点

  constructor(private http: HttpClient) { }

  getData(): Observable<any> {
    return this.http.get<any>(this.apiUrl);
  }
}

import { Component, OnInit } from '@angular/core';
import { DatabaseService } from 'path/to/database.service';

@Component({
  selector: 'app-data-list',
  templateUrl: './data-list.component.html',
  styleUrls: ['./data-list.component.css']
})
export class DataListComponent implements OnInit {
  data: any[];
  isLoading: boolean;

  constructor(private databaseService: DatabaseService) { }

  ngOnInit(): void {
    this.isLoading = true;
    this.databaseService.getData().subscribe(
      (response) => {
        this.data = response;
        this.isLoading = false;
      },
      (error) => {
        console.error(error);
        this.isLoading = false;
      }
    );
  }
}

<div *ngIf="isLoading">加载中...</div>
<ul *ngIf="!isLoading">
  <li *ngFor="let item of data">{{ item.name }}</li>
</ul>