public static SqlManipul GetInstance()
{
if (instance == null)
{
instance = new SqlManipul();
}
return(instance);
}
/// <summary>
/// Получение списка ID фильмов удовлетворяющих условию фильтрации
/// </summary>
/// <returns></returns>
public string GetFilterIdFilms()
{
SqlCommand command = new SqlCommand();
//SELECT ID, Poster, Название, [Год выхода], Язык, [Длительность(мин)], Жанр, Страна, Режиссёр, [Рейтинг / 10]
string commandText = "select ID FROM dbo.vMovies ";
//если хоть один фильтр выбран
if (GenreFilterId != -1 || CountryFilterId != -1 || YearFilterVal != -1 || DirectorFilterId != -1 || LanguageFilterId != -1 || RatedFilterId != -1)
{
string commandFilter = "where dbo.vMovies.ID in ( select dbo.Movie.MovieId from dbo.Movie ";
//фильтрация по жанру
if (GenreFilterId != -1)
{
SqlParameter pGenre = new SqlParameter("@genre", System.Data.SqlDbType.Int)
{
Value = GenreFilterId
};
command.Parameters.Add(pGenre);
commandFilter += @"inner join dbo.MovieOnGenre on dbo.Movie.MovieId=dbo.MovieOnGenre.MovieId and dbo.MovieOnGenre.GenreId=@genre ";
}
//фильтрация по стране
if (CountryFilterId != -1)
{
SqlParameter pCountry = new SqlParameter("@country", System.Data.SqlDbType.Int)
{
Value = CountryFilterId
};
command.Parameters.Add(pCountry);
commandFilter += @"inner join dbo.MovieOnCountry on dbo.Movie.MovieId=dbo.MovieOnCountry.MovieId and dbo.MovieOnCountry.CountryId=@country ";
}
//фильтрация по языку
if (LanguageFilterId != -1)
{
SqlParameter pLanguage = new SqlParameter("@language", System.Data.SqlDbType.Int)
{
Value = LanguageFilterId
};
command.Parameters.Add(pLanguage);
commandFilter += @"inner join dbo.LanguageInMovie on dbo.Movie.MovieId=dbo.LanguageInMovie.MovieId and dbo.LanguageInMovie.LanguageId=@language ";
}
//фильтрация по режессёру
if (DirectorFilterId != -1)
{
SqlParameter pDirector = new SqlParameter("@director", System.Data.SqlDbType.Int)
{
Value = DirectorFilterId
};
command.Parameters.Add(pDirector);
commandFilter += @"inner join dbo.vDirectorsInMovieTable on dbo.vDirectorsInMovieTable.MovieId=dbo.Movie.MovieId and dbo.vDirectorsInMovieTable.PersonId=@director ";
}
//фильтры для where для рейтинга и года выхода
if (YearFilterVal != -1 || RatedFilterId != -1)
{
commandFilter += "where ";
bool flag = false;
if (RatedFilterId != -1)
{
SqlParameter pRated = new SqlParameter("@rated", System.Data.SqlDbType.Int)
{
Value = RatedFilterId
};
command.Parameters.Add(pRated);
commandFilter += @"dbo.Movie.RatedId=@rated";
flag = true;
}
if (YearFilterVal != -1)
{
if (flag)
{
commandFilter += " and ";
}
SqlParameter pYear = new SqlParameter("@year", System.Data.SqlDbType.Int)
{
Value = YearFilterVal
};
command.Parameters.Add(pYear);
commandFilter += @"year(dbo.Movie.Released)=@year";
}
}
commandFilter += " )";
commandText += commandFilter;
}
command.CommandText = commandText;
string result = "";
using (SqlConnection connection = new SqlConnection(SqlManipul.GetInstance().ConnectionString))
{
connection.Open();
command.Connection = connection;
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
result += reader.GetInt32(0).ToString() + ",";
}
}
}
return(result.Trim(','));
}
