127 lines
4.9 KiB
C#
127 lines
4.9 KiB
C#
using System.Data;
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using DualScreenDemo;
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namespace DBObj
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{
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public class SQLManager
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{
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//private MyDB db = new MyDB();
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public List<SongData> FavoriteSongs { get; private set; }
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//public bool IsUserLoggedIn { get; set; }
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//public string UserPhoneNumber { get; set; }
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public SQLManager()
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{
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FavoriteSongs = new List<SongData>();
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}
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/*
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public void AddNewUser(string phoneNumber)
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{
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string databasePath = Path.Combine(Application.StartupPath, "db", databaseFileName);
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string connectionString = String.Format("Data Source={0};Version=3;", databasePath);
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using (var connection = new SQLiteConnection(connectionString))
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{
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try
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{
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connection.Open();
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string checkTableSql = "SELECT name FROM sqlite_master WHERE type='table' AND name='FavoriteSongs';";
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using (var checkCommand = new SQLiteCommand(checkTableSql, connection))
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{
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var result = checkCommand.ExecuteScalar();
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if (result == null)
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{
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throw new Exception("Table 'FavoriteSongs' does not exist.");
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}
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}
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string sql = "INSERT INTO FavoriteSongs (PhoneNumber, SongNumber) VALUES (@PhoneNumber, @SongNumber)";
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using (var command = new SQLiteCommand(sql, connection))
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{
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command.Parameters.AddWithValue("@PhoneNumber", phoneNumber);
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command.Parameters.AddWithValue("@SongNumber", "000000");
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command.ExecuteNonQuery();
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}
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connection.Close();
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}
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catch (Exception ex)
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{
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Console.WriteLine("Failed to add new user to SQLite database: " + ex.Message);
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}
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}
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}
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*/
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public List<SongData> SearchNewSongs()
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{
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string query = $"SELECT * FROM song_library_cache WHERE language_name = '國語' ORDER BY add_date DESC LIMIT 1000;";
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return select_Mysql(query);
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}
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public List<SongData> SearchHotSongs()
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{
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string query = $"SELECT * FROM song_library_cache WHERE language_name = '國語' ORDER BY song_counts DESC LIMIT 1000;";
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return select_Mysql(query);
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}
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public List<SongData> SearchSongsBySinger(string keyword)
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{
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Console.WriteLine("keyword : " + keyword);
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var keywordLower = keyword.ToLower();
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string query = $"SELECT * FROM song_library_cache WHERE artistA LIKE '%{keywordLower}%' OR artistB LIKE'%{keywordLower}%'ORDER BY song_counts DESC;";
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return select_Mysql(query);
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}
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public List<SongData> SearchSongsByName(string keyword)
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{
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string query = $"SELECT * FROM song_library_cache WHERE LOWER(song_name) LIKE CONCAT('%', LOWER('{keyword}'), '%') ORDER BY song_name DESC;";
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return select_Mysql(query);
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}
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public SongData SearchSongByNumber(string songNumber)
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{
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List<SongData> searchResults = new List<SongData>();
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string query = $"SELECT * FROM song_library_cache WHERE song_id = '{songNumber}';";
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using (var db = new MyDB())
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{
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if (db.open(query, null))
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{
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if (db.recordCount() != 0)
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{
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searchResults.Add(newSongData( db ));
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}
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}
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}
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return searchResults.FirstOrDefault();
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}
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private List<SongData> select_Mysql(string query)
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{
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List<SongData> searchResults = new List<SongData>();
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Console.WriteLine(query);
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using (var db = new MyDB())
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{
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if (db.open(query, null))
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{
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while (db.Read())
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{
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searchResults.Add(newSongData( db ));
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}
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}
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Console.WriteLine($"查詢到 {searchResults.Count} 筆資料。");
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}
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return searchResults;
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}
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private SongData newSongData(MyDB db) {
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return new SongData(
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db.Field<string>("song_id") ?? "",
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db.Field<string>("song_name") ?? "",
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db.Field<string>("artistA") ?? "",
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db.Field<string>("artistB") ?? "",
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db.Field<string>("song_filename") ?? "",
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db.Field<string>("artistA_simplified") ?? "",
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db.Field<string>("artistB_simplified") ?? "",
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db.Field<string>("song_simplified")?? "",
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db.Field<int>("vocal")
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);
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}
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}
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} |