public IList<Track> GetListOfTracksByCd(int cdId)
{
OpenSqlConnection();
const string query = "Select Id, Name, Length, Artist from Track where CDId = @CdId";
var command = new SqlCommand(query, SqlConnection);
command.Parameters.AddWithValue("@CdId", cdId);
var listOfTracks = new List<Track>();
var dataReader = command.ExecuteReader();
try
{
while (dataReader.Read())
{
var track = new Track
{
Id = (int) dataReader["Id"],
Name = dataReader["Name"].ToString(),
Length = (int) dataReader["Length"],
Artist = dataReader["Artist"].ToString()
};
listOfTracks.Add(track);
}
}
finally
{
dataReader.Close();
}
return listOfTracks;
}
public Track GetTrackDetails(int id)
{
OpenSqlConnection();
var query = "Select Id, Name, Length, Artist, CDId from Track where Id = @Id";
var command = new SqlCommand(query, SqlConnection);
command.Parameters.AddWithValue("@Id", id);
var dataReader = command.ExecuteReader();
try
{
dataReader.Read();
var track = new Track
{
Artist = dataReader["Artist"].ToString(),
Id = (int) dataReader["Id"],
Length = (int) dataReader["Length"],
Name = dataReader["Name"].ToString()
};
var cd = _cdRepository.GetById((int) dataReader["CDId"]);
track.CD = cd;
return track;
}
finally
{
dataReader.Close();
}
}
private int InsertTrack(int cdId, Track track)
{
var trackInsertQuery =
"Insert Into Track (Name, Length, Artist, CDId) Values(@Name, @Length, @Artist, @CDId); SELECT CAST(scope_identity() AS int)";
var trackInsertCommand = new SqlCommand(trackInsertQuery, SqlConnection);
trackInsertCommand.Parameters.AddWithValue("@Name", track.Name);
trackInsertCommand.Parameters.AddWithValue("@Length", track.Length);
trackInsertCommand.Parameters.AddWithValue("@Artist", track.Artist);
trackInsertCommand.Parameters.AddWithValue("@CDId", cdId);
return (int)trackInsertCommand.ExecuteScalar();
}
private int UpdateTrack(Track track)
{
OpenSqlConnection();
const string trackQuery =
"Update Track Set Name = @Name, Length = @Length, Artist = @Artist Where Id = @Id";
var trackCommand = new SqlCommand(trackQuery, SqlConnection);
trackCommand.Parameters.AddWithValue("@Id", track.Id);
trackCommand.Parameters.AddWithValue("@Name", track.Name);
trackCommand.Parameters.AddWithValue("@Length", track.Length);
trackCommand.Parameters.AddWithValue("@Artist", track.Artist);
trackCommand.ExecuteNonQuery();
return track.Id;
}
public int Save(Track track)
{
if (track.Id == 0)
{
return InsertTrack(track.CD.Id, track);
}
return UpdateTrack(track);
}