private DelegatedMigrator CreateMigrator(DbMigrationsConfiguration c, int migratorPriority, DbConnection cnn)
{
var migrator = DelegatedMigrator.CreateFromMigrationConfig(c, cnn);
migrator.Priority = migratorPriority;
return(migrator);
}
private IEnumerable <MigrationInfo> GetAllMigrations(DelegatedMigrator migrator)
{
var parser = MigrationInfo.CreateParser(null);
List <MigrationInfo> applied = migrator.GetDatabaseMigrations().Select(parser.Parse).ToList();
var all = applied.Union(GetPendingMigrations(migrator))
.OrderBy(m => m.CreatedOn)
.ThenBy(m => migrator.Priority)
.ToList();
return(all);
}
public static DelegatedMigrator CreateFromMigrationConfig(DbMigrationsConfiguration c, DbConnection cnn)
{
var impl = new DbMigrator(c);
var scriptingImpl = new MigratorScriptingDecorator(new DbMigrator(c));
var migrator = new DelegatedMigrator(impl.GetPendingMigrations, impl.GetDatabaseMigrations, impl.Update,
scriptingImpl.ScriptUpdate, cnn)
{
IsAutoMigrationsEnabled = c.AutomaticMigrationsEnabled,
ConfigurationTypeName = c.GetType().FullName
};
return(migrator);
}
public bool Run()
{
// note: currently the seed method for each DbMigrationsConfiguration is being run multiple times
// todo: work out some way to tell DbMigrationsConfiguration.Seed that it should only run once
var migrations = (
from migrator in _migrators
from migration in GetPendingMigrations(migrator)
select new { migrator, migration }
).ToList();
var orderedMigrations = migrations
.OrderBy(m => m.migration.CreatedOn).ThenBy(m => m.migrator.Priority)
.ToList();
var batchedMigrations = orderedMigrations
.SliceWhen((prev, current) => prev != null && prev.migrator != current.migrator || current.migration.IsSkipped)
.ToList();
if (migrations.Any(m => m.migration.IsSkipped))
{
_allMigrations = _migrators.ToDictionary(m => m, GetAllMigrations);
}
batchedMigrations.ForEach(batch =>
{
batch = batch.ToList();
DelegatedMigrator migator = batch.First().migrator;
MigrationInfo lastMigration = batch.Last().migration;
if (lastMigration.IsSkipped)
{
// Q: Why do we need to insert a skipped migration into the migration history table?
// A: the standard behaviour when calling migator.Update(lastMigration.FullName) is to execute
// ALL migrations after the last inserted migration in the db and the migration identified
// by lastMigration.FullName
// This will result in running migration that was skipped in the previous batch
var previousMigration =
_allMigrations[migator].TakeWhile(m => m.CreatedOn < lastMigration.CreatedOn).LastOrDefault();
migator.InsertMigrationHistory(previousMigration != null ? previousMigration.FullName : null, lastMigration.FullName);
}
else
{
migator.Update(lastMigration.FullName);
}
});
bool migrationsRun = migrations.Any(m => !m.migration.IsSkipped);
return(migrationsRun);
}
private IEnumerable <MigrationInfo> GetPendingMigrations(DelegatedMigrator migrator)
{
var parser = MigrationInfo.CreateParser(SkippedMigrations);
List <MigrationInfo> migrations = migrator.GetPendingMigrations().Select(parser.Parse).ToList();
if (migrator.IsAutoMigrationsEnabled)
{
return(migrations.Union(new[] { MigrationInfo.Auto }));
}
else
{
return(migrations);
}
}
private DbConnection CreateDbConnection()
{
ConnectionStringSettings connectionString = ConfigurationManager.ConnectionStrings[_connectionStringName];
return(DelegatedMigrator.CreateDbConnection(connectionString));
}