func MigrateMaxMigrations(dbMap *gorp.DbMap, max int) (int, error) {
source, dialect, err := migrationSource(dbMap)
if err != nil {
return 0, err
}
return migrate.ExecMax(dbMap.Db, dialect, source, migrate.Up, max)
}
// Migrate performs schema migration. Migrations can occur in one of three
// ways:
//
// - up: migrations are performed from the currently installed version upwards.
// If count is 0, all unapplied migrations will be run.
//
// - down: migrations are performed from the current version downard. If count
// is 0, all applied migrations will be run in a downard direction.
//
// - redo: migrations are first ran downard `count` times, and then are rand
// upward back to the current version at the start of the process. If count is
// 0, a count of 1 will be assumed.
func Migrate(db *sql.DB, dir MigrateDir, count int) (int, error) {
switch dir {
case MigrateUp:
return migrate.ExecMax(db, "postgres", Migrations, migrate.Up, count)
case MigrateDown:
return migrate.ExecMax(db, "postgres", Migrations, migrate.Down, count)
case MigrateRedo:
if count == 0 {
count = 1
}
down, err := migrate.ExecMax(db, "postgres", Migrations, migrate.Down, count)
if err != nil {
return down, err
}
return migrate.ExecMax(db, "postgres", Migrations, migrate.Up, down)
default:
return 0, errors.New("Invalid migration direction")
}
}
func MigrateMaxMigrations(dbMap *gorp.DbMap, max int) (int, error) {
source := getSource()
return migrate.ExecMax(dbMap.Db, migrationDialect, source, migrate.Up, max)
}