89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
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package goose
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import (
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"database/sql"
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"fmt"
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"os"
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"path/filepath"
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"text/template"
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)
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// Create writes a new blank migration file.
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func Create(db *sql.DB, dir, name, migrationType string) error {
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migrations, err := CollectMigrations(dir, minVersion, maxVersion)
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if err != nil {
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return err
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}
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// Initial version.
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version := "00001"
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if last, err := migrations.Last(); err == nil {
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version = fmt.Sprintf("%05v", last.Version+1)
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}
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filename := fmt.Sprintf("%v_%v.%v", version, name, migrationType)
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fpath := filepath.Join(dir, filename)
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tmpl := sqlMigrationTemplate
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if migrationType == "go" {
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tmpl = goSQLMigrationTemplate
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}
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path, err := writeTemplateToFile(fpath, tmpl, version)
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if err != nil {
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return err
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}
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fmt.Printf("Created new file: %s\n", path)
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return nil
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}
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func writeTemplateToFile(path string, t *template.Template, version string) (string, error) {
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if _, err := os.Stat(path); !os.IsNotExist(err) {
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return "", fmt.Errorf("failed to create file: %v already exists", path)
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}
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f, err := os.Create(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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err = t.Execute(f, version)
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if err != nil {
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return "", err
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}
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return f.Name(), nil
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}
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var sqlMigrationTemplate = template.Must(template.New("goose.sql-migration").Parse(`-- +goose Up
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-- SQL in this section is executed when the migration is applied.
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-- +goose Down
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-- SQL in this section is executed when the migration is rolled back.
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`))
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var goSQLMigrationTemplate = template.Must(template.New("goose.go-migration").Parse(`package migration
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import (
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"database/sql"
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"github.com/pressly/goose"
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)
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func init() {
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goose.AddMigration(Up{{.}}, Down{{.}})
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}
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func Up{{.}}(tx *sql.Tx) error {
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// This code is executed when the migration is applied.
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return nil
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}
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func Down{{.}}(tx *sql.Tx) error {
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// This code is executed when the migration is rolled back.
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return nil
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}
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`))
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