Example #1
0
// Create creates new migration files on disk
func Create(url, migrationsPath, name string) (*file.MigrationFile, error) {
	d, err := driver.New(url)
	if err != nil {
		return nil, err
	}
	files, err := file.ReadMigrationFiles(migrationsPath, file.FilenameRegex(d.FilenameExtension()))
	if err != nil {
		return nil, err
	}

	version := uint64(0)
	if len(files) > 0 {
		lastFile := files[len(files)-1]
		version = lastFile.Version
	}
	version += 1
	versionStr := strconv.FormatUint(version, 10)

	length := 4 // TODO(mattes) check existing files and try to guess length
	if len(versionStr)%length != 0 {
		versionStr = strings.Repeat("0", length-len(versionStr)%length) + versionStr
	}

	filenamef := "%s_%s.%s.%s"
	name = strings.Replace(name, " ", "_", -1)

	mfile := &file.MigrationFile{
		Version: version,
		UpFile: &file.File{
			Path:      migrationsPath,
			FileName:  fmt.Sprintf(filenamef, versionStr, name, "up", d.FilenameExtension()),
			Name:      name,
			Content:   []byte(""),
			Direction: direction.Up,
		},
		DownFile: &file.File{
			Path:      migrationsPath,
			FileName:  fmt.Sprintf(filenamef, versionStr, name, "down", d.FilenameExtension()),
			Name:      name,
			Content:   []byte(""),
			Direction: direction.Down,
		},
	}

	if err := ioutil.WriteFile(path.Join(mfile.UpFile.Path, mfile.UpFile.FileName), mfile.UpFile.Content, 0644); err != nil {
		return nil, err
	}
	if err := ioutil.WriteFile(path.Join(mfile.DownFile.Path, mfile.DownFile.FileName), mfile.DownFile.Content, 0644); err != nil {
		return nil, err
	}

	return mfile, nil
}
Example #2
0
// initDriverAndReadMigrationFilesAndGetVersion is a small helper
// function that is common to most of the migration funcs
func initDriverAndReadMigrationFilesAndGetVersion(url, migrationsPath string) (driver.Driver, *file.MigrationFiles, uint64, error) {
	d, err := driver.New(url)
	if err != nil {
		return nil, nil, 0, err
	}
	files, err := file.ReadMigrationFiles(migrationsPath, file.FilenameRegex(d.FilenameExtension()))
	if err != nil {
		d.Close() // TODO what happens with errors from this func?
		return nil, nil, 0, err
	}
	version, err := d.Version()
	if err != nil {
		d.Close() // TODO what happens with errors from this func?
		return nil, nil, 0, err
	}
	return d, &files, version, nil
}