Migrator(Options options)
{
_output = options.Output;
options.AssertValid();
_isPreview = options.IsPreview;
_useGlobalTransaction = options.UseGlobalTransaction || _isPreview; // always run preview in a global transaction so previous migrations are seen
_force = options.Force;
var dir = options.GetFolder();
Log("Mayflower.NET Migrator");
Log(" Directory: " + dir);
Log(" Provider: " + options.Provider);
_db = new ConnectionContext(options);
Log(" Database: " + _db.Database);
Migrations = GetAllMigrations(dir, _db.CommandSplitter).ToList();
if (!Migrations.Any())
{
Log("No migrations found.");
return;
}
_db.Open();
Log(" Transaction Mode: " + (_useGlobalTransaction ? "Global" : "Individual"));
EnsureMigrationsTableExists();
_alreadyRan = _tableExists ? _db.GetAlreadyRan() : new AlreadyRan(Enumerable.Empty <MigrationRow>());
Log(" Prior Migrations: " + _alreadyRan.Count);
if (_alreadyRan.Count > 0)
{
var last = _alreadyRan.Last;
Log($" Last Migration: \"{last.Filename}\" on {last.ExecutionDate:u}");
}
Log();
if (_isPreview && !options.UseGlobalTransaction)
{
Log("Using global transaction mode because of preview mode");
Log();
}
}
internal MigrateMode GetMigrateMode(AlreadyRan alreadyRan)
{
MigrationRow row;
if (alreadyRan.ByFilename.TryGetValue(Filename, out row))
{
return(row.Hash == Hash ? MigrateMode.Skip : MigrateMode.HashMismatch);
}
if (alreadyRan.ByHash.TryGetValue(Hash, out row))
{
return(MigrateMode.Rename);
}
return(MigrateMode.Run);
}