private void WriteEntries(IEnumerable <Entry> entries, SqliteConnection connection, int maxId, ref DateTime min, ref DateTime max)
{
using (var transaction = connection.BeginTransaction())
{
foreach (var e in entries)
{
StoryTable.Write(e, connection, transaction);
if (e.Date > max)
{
max = e.Date;
}
if (e.Date < min)
{
min = e.Date;
}
}
DateRangeTable.Write(min, max, connection, transaction);
LastWriteTable.Write(maxId, connection, transaction);
transaction.Commit();
}
}
/// <summary>
/// Handles the one-time migration of data from the binary file format to SQLite.
/// </summary>
public static void Main(string[] args)
{
const string databaseLocation = @"C:\git\csharp\hn-reader\data";
const string dataLocation = @"C:\git\csharp\hn-reader";
var dbName = Path.Combine(databaseLocation, "hn-data.sqlite");
if (File.Exists(dbName))
{
throw new InvalidOperationException("Database already exists! " + dbName);
}
using (var connection = Connector.ConnectToFile(dbName))
{
var command = new SQLiteCommand(Schema.Create, connection);
command.ExecuteNonQuery();
VersionTable.Write(1, connection);
var backfilledFiles = Directory.GetFiles(dataLocation, "*-complete.bin");
var trackers = new DataTrackers();
using (var transaction = connection.BeginTransaction())
{
foreach (var backfilledFile in backfilledFiles)
{
WriteFileIntoDatabase(backfilledFile, connection, trackers);
Console.WriteLine("Completed file: " + Path.GetFileName(backfilledFile));
}
transaction.Commit();
}
using (var transaction = connection.BeginTransaction())
{
WriteFileIntoDatabase(Path.Combine(dataLocation, "hn.bin"), connection, trackers);
transaction.Commit();
}
LastWriteTable.Write(trackers.MaxId, connection);
DateRangeTable.Write(trackers.MinDate, trackers.MaxDate, connection);
}
}
