SUBD_LAB/SUBD_LABA/Database/ImplementsPostgres.cs

using Commentbase;
using Npgsql;
using System.Collections.Generic;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Database
{
	public class ImplementsPostgres : Abstracts
	{
		private NpgsqlConnection GetConnect()
		{
			return new NpgsqlConnection("Host=192.168.56.102;Username=postgres;Password=postgres;Database=postgres");
		}
		public override void CreateAlbum(Album album)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO Album (Title, Description) " +
				"VALUES (@Title, @Description)", conn);
			cmd.Parameters.AddWithValue("@Title", album.Title);
			cmd.Parameters.AddWithValue("@Description", album.Description);
			cmd.ExecuteNonQuery();
		}

		public override void UpdateAlbum(Album album)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"UPDATE Album SET Title = @Title, Description = @Description WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Title", album.Title);
			cmd.Parameters.AddWithValue("@Description", album.Description);
			cmd.Parameters.AddWithValue("@Id", album.Id);
			cmd.ExecuteNonQuery();
		}

		public override void DeleteAlbum(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Album WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Id", id);
			cmd.ExecuteNonQuery();
		}

		public override Album GetAlbum(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Album WHERE id = {id}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Album
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(1),
					Description = reader.GetString(2),
				};
			}
			return null;
		}

		public override Album GetAlbum(string title)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Album WHERE Title = '{title}'", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Album
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(1),
					Description = reader.GetString(2),
				};
			}
			return null;
		}

		public override List<Album> GetAlbums()
		{
			List<Album> albums = new List<Album>();
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM Album", conn);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				albums.Add(new Album
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(1),
					Description = reader.GetString(2),
				});
			}
			return albums;
		}

		public override void DeleteAllAlbums()
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Album", conn);
			cmd.ExecuteNonQuery();
		}

		public override void CreateLocation(Location location)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO Location (Name, Shortname) " +
				"VALUES (@Name, @Shortname)", conn);
			cmd.Parameters.AddWithValue("@Name", location.Name);
			cmd.Parameters.AddWithValue("@Shortname", location.ShortName);
			cmd.ExecuteNonQuery();
		}

		public override void UpdateLocation(Location location)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("UPDATE Location SET Name = @Name, ShortName = @Shortname WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Name", location.Name);
			cmd.Parameters.AddWithValue("@Shortname", location.ShortName);
			cmd.Parameters.AddWithValue("@Id", location.Id);
			cmd.ExecuteNonQuery();
		}

		public override void DeleteLocation(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Location WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Id", id);
			cmd.ExecuteNonQuery();
		}

		public override Location GetLocation(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Location WHERE id = {id}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Location
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					ShortName = reader.GetString(2),
				};
			}
			return null;
		}

		public override Location GetLocation(string name)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Location WHERE Name = '{name}'", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Location
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					ShortName = reader.GetString(2),
				};
			}
			return null;
		}

		public override List<Location> GetLocations()
		{
			List<Location> locations = new List<Location>();
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM Location", conn);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				locations.Add(new Location
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					ShortName = reader.GetString(2),
				});
			}
			return locations;
		}

		public override void DeleteAllLocations()
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Location", conn);
			cmd.ExecuteNonQuery();
		}

		public override void CreatePhoto(Photo photo)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO Photo (Title, Description, Privacy, UploadDate, ImagePath, AlbumId, LocationId, AuthorId) " +
				"VALUES (@Title, @Description, @Privacy, @UploadDate, @ImagePath, @Album, @Location, @Author)", conn);
			cmd.Parameters.AddWithValue("@Title", photo.Title);
			cmd.Parameters.AddWithValue("@Description", photo.Description);
			cmd.Parameters.AddWithValue("@Privacy", photo.Privacy);
			cmd.Parameters.AddWithValue("@UploadDate", photo.UploadDate);
			cmd.Parameters.AddWithValue("@ImagePath", photo.ImagePath);
			cmd.Parameters.AddWithValue("@Album", photo.AlbumId);
			cmd.Parameters.AddWithValue("@Location", photo.LocationId);
			cmd.Parameters.AddWithValue("@Author", photo.AuthorId);
			cmd.ExecuteNonQuery();
		}

		public override void UpdatePhoto(Photo photo)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("UPDATE Photo SET Title = @Title, Description = @Description, Privacy = @Privacy, UploadDate = @UploadDate, ImagePath = @ImagePath, AlbumId = @Album, LocationId = @Location, AuthorId = @Author WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Title", photo.Title);
			cmd.Parameters.AddWithValue("@Description", photo.Description);
			cmd.Parameters.AddWithValue("@Privacy", photo.Privacy);
			cmd.Parameters.AddWithValue("@UploadDate", photo.UploadDate);
			cmd.Parameters.AddWithValue("@ImagePath", photo.ImagePath);
			cmd.Parameters.AddWithValue("@Album", photo.AlbumId);
			cmd.Parameters.AddWithValue("@Location", photo.LocationId);
			cmd.Parameters.AddWithValue("@Author", photo.AuthorId);
			cmd.Parameters.AddWithValue("@Id", photo.Id);
			cmd.ExecuteNonQuery();
		}

		public override void DeletePhoto(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Photo WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Id", id);
			cmd.ExecuteNonQuery();
		}

		public override Photo GetPhoto(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Photo WHERE id = {id}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Photo
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(4),
					Description = reader.GetString(5),
					Privacy = reader.GetString(6),
					UploadDate = reader.GetDateTime(7),
					ImagePath = reader.GetString(8),
					AlbumId = reader.GetInt32(1),
					LocationId = reader.GetInt32(2),
					AuthorId = reader.GetInt32(3)
				};
			}
			return null;
		}

		public override Photo GetPhoto(int AlbumId, int LocationId, int AuthorId)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Photo WHERE (AlbumId = {AlbumId} AND LocationId = {LocationId} AND AuthorId = {AuthorId})", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Photo
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(4),
					Description = reader.GetString(5),
					Privacy = reader.GetString(6),
					UploadDate = reader.GetDateTime(7),
					ImagePath = reader.GetString(8),
					AlbumId = reader.GetInt32(1),
					LocationId = reader.GetInt32(2),
					AuthorId = reader.GetInt32(3)
				};
			}
			return null;
		}

		public override List<Photo> GetPhotos()
		{
			List<Photo> photos = new List<Photo>();
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM Photo", conn);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				photos.Add(new Photo
				{
					Id = reader.GetInt32(0),
					Title = reader.GetString(4),
					Description = reader.GetString(5),
					Privacy = reader.GetString(6),
					UploadDate = reader.GetDateTime(7),
					ImagePath = reader.GetString(8),
					AlbumId = reader.GetInt32(1),
					LocationId = reader.GetInt32(2),
					AuthorId = reader.GetInt32(3)
				});
			}
			return photos;
		}

		public override void DeleteAllPhotos()
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Photo", conn);
			cmd.ExecuteNonQuery();
		}

		public override void CreateAuthor(Author author)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO Author (Name, PhoneNum, Email) " +
				"VALUES (@Name, @PhoneNum, @Email)", conn);
			cmd.Parameters.AddWithValue("@Name", author.Name);
			cmd.Parameters.AddWithValue("@PhoneNum", author.PhoneNum);
			cmd.Parameters.AddWithValue("@Email", author.Email);
			cmd.ExecuteNonQuery();
		}

		public override void UpdateAuthor(Author author)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("UPDATE Author SET Name = @Name, PhoneNum = @PhoneNum, Email = @Email WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Name", author.Name);
			cmd.Parameters.AddWithValue("@PhoneNum", author.PhoneNum);
			cmd.Parameters.AddWithValue("@Email", author.Email);
			cmd.Parameters.AddWithValue("@Id", author.Id);
			cmd.ExecuteNonQuery();
		}

		public override void DeleteAuthor(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Author WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Id", id);
			cmd.ExecuteNonQuery();
		}

		public override Author GetAuthor(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Author WHERE id = {id}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Author
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					PhoneNum = reader.GetString(2),
					Email = reader.GetString(3)
				};
			}
			return null;
		}

		public override Author GetAuthor(string name)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Author WHERE Name = '{name}'", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Author
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					PhoneNum = reader.GetString(2),
					Email = reader.GetString(3)
				};
			}
			return null;
		}

		public override List<Author> GetAuthors()
		{
			List<Author> authors = new List<Author>();
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM Author", conn);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				authors.Add(new Author
				{
					Id = reader.GetInt32(0),
					Name = reader.GetString(1),
					PhoneNum = reader.GetString(2),
					Email = reader.GetString(3)
				});
			}
			return authors;
		}

		public override void DeleteAllAuthors()
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Author", conn);
			cmd.ExecuteNonQuery();
		}

		public override void CreateComment(Comment comment)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("INSERT INTO Comment (PostDate, Content, Photold) " +
				"VALUES (@PostDate, @Content, @Photo)", conn);
			cmd.Parameters.AddWithValue("@PostDate", comment.PostDate);
			cmd.Parameters.AddWithValue("@Content", comment.Content);
			cmd.Parameters.AddWithValue("@Photo", comment.PhotoId);
			cmd.ExecuteNonQuery();
		}

		public override void UpdateComment(Comment comment)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("UPDATE Comment SET PostDate = @PostDate, Content = @Content, Photold = @Photo WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@PostDate", comment.PostDate);
			cmd.Parameters.AddWithValue("@Content", comment.Content);
			cmd.Parameters.AddWithValue("@Photo", comment.PhotoId);
			cmd.Parameters.AddWithValue("@Id", comment.Id);
			cmd.ExecuteNonQuery();
		}

		public override void DeleteComment(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Comment WHERE id = @Id", conn);
			cmd.Parameters.AddWithValue("@Id", id);
			cmd.ExecuteNonQuery();
		}

		public override Comment GetComment(int id)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Comment WHERE id = {id}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Comment
				{
					Id = reader.GetInt32(0),
					PostDate = reader.GetDateTime(2),
					Content = reader.GetString(3),
					PhotoId = reader.GetInt32(1)
				};
			}
			return null;
		}

		public override Comment GetCommentPhoto(int PhotoId)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"SELECT * FROM Comment WHERE Photold = {PhotoId}", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Comment
				{
					Id = reader.GetInt32(0),
					PostDate = reader.GetDateTime(2),
					Content = reader.GetString(3),
					PhotoId = reader.GetInt32(1)
				};
			}
			return null;
		}

		public override List<Comment> GetComments()
		{
			List<Comment> comments = new List<Comment>();
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT * FROM Comment", conn);
			using var reader = cmd.ExecuteReader();
			while (reader.Read())
			{
				comments.Add(new Comment
				{
					Id = reader.GetInt32(0),
					PostDate = reader.GetDateTime(2),
					Content = reader.GetString(3),
					PhotoId = reader.GetInt32(1)
				});
			}
			return comments;
		}

		public override void DeleteAllComments()
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand($"DELETE FROM Comment", conn);
			cmd.ExecuteNonQuery();
		}
		private Sequence GetSequence(string nameInPg, string nameInApp)
		{
			using var conn = GetConnect();
			conn.Open();
			using var cmd = new NpgsqlCommand("SELECT sequencename, last_value " +
				"FROM pg_sequences " +
				"WHERE sequencename = '" + nameInPg + "_id_seq'", conn);
			using var reader = cmd.ExecuteReader();
			if (reader.Read())
			{
				return new Sequence
				{
					Id = nameInApp,
					Count = reader.GetInt32(1)
				};
			}
			else
				return new Sequence
				{
					Id = nameInApp,
					Count = 0
				};
		}

		public List<Sequence> GetSequences()
		{
			return new List<Sequence>{
				GetSequence("album", "Album"),
				GetSequence("location", "Location"),
				GetSequence("author", "Author"),
				GetSequence("photo", "Photo"),
				GetSequence("comment", "Comment")
			};
		}
	}
}