webCrawlerGoogle/webCrawlerGoogle/Form1.cs

using MySql.Data.MySqlClient;
using Newtonsoft.Json.Linq;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.ListView;

namespace webCrawlerGoogle
{
    public partial class Form1 : Form
    {
        private const string ApiKey = "AIzaSyCjdysuuyc2bs4ikqT8xyIpPJHiDZ4CEo4"; // Füge hier deinen API-Schlüssel ein
        private string connectionString = "Server=192.168.178.201;Database=domainchecker;User ID=root;Password=1td5rugut8;";

        public Form1()
        {
            InitializeComponent();
        }

        private async void btnSearch_Click(object sender, EventArgs e)
        {
            string category = txtCategory.Text;
            string city = txtCity.Text;

            if (string.IsNullOrEmpty(category) || string.IsNullOrEmpty(city))
            {
                MessageBox.Show("Bitte sowohl eine Rubrik als auch eine Stadt eingeben.");
                return;
            }

            string requestUri = $"https://maps.googleapis.com/maps/api/place/textsearch/json?query={category}+in+{city}&key={ApiKey}";

            using (HttpClient client = new HttpClient())
            {
                HttpResponseMessage response = await client.GetAsync(requestUri);
                if (response.IsSuccessStatusCode)
                {
                    string jsonResult = await response.Content.ReadAsStringAsync();
                    JObject result = JObject.Parse(jsonResult);

                    lstResults.Items.Clear();

                    foreach (var place in result["results"])
                    {
                        string website = await GetPlaceDetails((string)place["place_id"]);
                        if (!string.IsNullOrEmpty(website))
                        {
                            lstResults.Items.Add(website);
                            SaveToDatabase(website);
                        }
                    }
                }
                else
                {
                    MessageBox.Show("Fehler bei der Anfrage: " + response.StatusCode);
                }
            }
        }

        private async Task<string> GetPlaceDetails(string placeId)
        {
            string requestUri = $"https://maps.googleapis.com/maps/api/place/details/json?place_id={placeId}&fields=website&key={ApiKey}";

            using (HttpClient client = new HttpClient())
            {
                HttpResponseMessage response = await client.GetAsync(requestUri);
                if (response.IsSuccessStatusCode)
                {
                    string jsonResult = await response.Content.ReadAsStringAsync();
                    JObject result = JObject.Parse(jsonResult);

                    return (string)result["result"]["website"];
                }

                return null;
            }
        }

        private void SaveToDatabase(string website)
        {
            using (MySqlConnection conn = new MySqlConnection(connectionString))
            {
                conn.Open();
                string queryCheck = "SELECT COUNT(*) FROM webCrawler WHERE webseite = @website";
                using (MySqlCommand cmdCheck = new MySqlCommand(queryCheck, conn))
                {
                    cmdCheck.Parameters.AddWithValue("@website", website);
                    int count = Convert.ToInt32(cmdCheck.ExecuteScalar());

                    if (count == 0)
                    {
                        string queryInsert = "INSERT INTO webCrawler (webseite) VALUES (@website)";
                        using (MySqlCommand cmdInsert = new MySqlCommand(queryInsert, conn))
                        {
                            cmdInsert.Parameters.AddWithValue("@website", website);

                            cmdInsert.ExecuteNonQuery();
                        }
                    }
                }
            }
        }
    }
}