/// <summary>
/// Deletes the record from the migration table.
/// </summary>
public virtual void Delete()
{
var migrationRecord = MigrationRecord.Find(this.Uuid);
if (migrationRecord == null)
{
throw new InvalidDataException(string.Format("The migration {0} cannot be deleted from the migration table.", this.Name));
}
migrationRecord.Delete();
}
/// <summary>
/// Rolls back all found migrations to a specified version.
/// </summary>
/// <param name="version">The version number up to which to roll back to.</param>
/// <param name="hard">If true, ignores thrown errors and powers through the migration reverse.</param>
public static void ResetTo(Version version, bool hard = false)
{
// Get all migrations in reverse
var migrations = GetAllMigrationsReverse();
var writtenMigrations = new List <MigrationRecord>();
// Read migrations table to get all
var template = new MigrationRecord();
if (DatabaseSession.Instance.Connector.CheckTableExists(template))
{
writtenMigrations = DatabaseSession.Instance.Connector.ReadRecords <MigrationRecord>();
}
// leave only the migrations which are above the specified version
migrations = migrations.Where(m => m.Version > version).OrderByDescending(x => x.FullName).ToList();
Logger.Info($"Resetting to database version {version}...");
// Perform peice by peice rollback
foreach (var migration in migrations)
{
// perform the necessary check whether the migration should be rolled back. Only roll back if it has been applied.
if (writtenMigrations.Any(m => m.Uuid == migration.Uuid))
{
// perform the migration script
try
{
Logger.Info($"Rolling back migration {migration.Name}...");
migration.Reverse();
migration.Delete();
Logger.Info("Done");
}
catch (Exception ex)
{
if (!hard)
{
throw new Exception(string.Format("Migration rollback of {1} failed: {0}", ex.Message, migration.Name));
}
}
}
}
}
/// <summary>
/// Rolls back all found migrations
/// </summary>
/// <param name="name">The name of the single rollback to perform. Must be the Name parameter of the <see cref="IMigration"/></param>
/// <param name="hard">If true, ignores thrown errors and powers through the migration reverse.</param>
public static void Reset(string name = null, bool hard = false)
{
// Get all migrations in reverse
var migrations = GetAllMigrationsReverse();
var writtenMigrations = new List <MigrationRecord>();
// Read migrations table to get all
var template = new MigrationRecord();
if (DatabaseSession.Instance.Connector.CheckTableExists(template))
{
writtenMigrations = DatabaseSession.Instance.Connector.ReadRecords <MigrationRecord>();
}
if (!string.IsNullOrEmpty(name))
{
migrations = migrations.Where(m => m.Name == name).ToList();
}
// Perform peice by peice rollback
foreach (var migration in migrations)
{
// perform the necessary check whether the migration should be rolled back. Only roll back if it has been applied.
if (writtenMigrations.Any(m => m.Uuid == migration.Uuid))
{
// perform the migration script
try
{
Logger.Info($"Executing reverse on migration {migration.Name}...");
migration.Reverse();
migration.Delete();
Logger.Info("Done");
}
catch (Exception ex)
{
if (!hard)
{
throw new Exception(string.Format("Migration rollback of {1} failed: {0}", ex.Message, migration.Name));
}
}
}
}
}
/// <summary>
/// Checks whether the migration should execute.
/// </summary>
/// <returns>True if the migration should run.</returns>
public virtual bool ShouldMigrate()
{
return(MigrationRecord.Find(this.Uuid) == null);
}
/// <summary>
/// Saves the migration information to the migration table
/// </summary>
public virtual void Save()
{
var migration = new MigrationRecord(this);
migration.Save();
}
