darroyo
9a9d4cc753
- Add schema_migrations table to track applied migrations - Migrate() now checks if a migration was already applied before running - 0002 rewritten to use SAVEPOINT+ROLLBACK per column, making it safe to run even if some columns were partially added previously - Each migration runs in its own transaction; INSERT into schema_migrations only happens if the SQL executes without error - Bump VERSION 0.1.8 -> 0.1.9
125 lines
2.5 KiB
Go
125 lines
2.5 KiB
Go
package db
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import (
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"database/sql"
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"embed"
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"fmt"
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"io/fs"
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"sort"
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"strings"
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_ "modernc.org/sqlite"
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)
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//go:embed migrations/*.sql
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var migrationsFS embed.FS
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type DB struct {
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conn *sql.DB
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}
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func Open(path string) (*DB, error) {
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conn, err := sql.Open("sqlite", path)
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if err != nil {
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return nil, fmt.Errorf("open sqlite: %w", err)
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}
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if _, err := conn.Exec(`PRAGMA foreign_keys = ON`); err != nil {
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_ = conn.Close()
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return nil, fmt.Errorf("enable foreign keys: %w", err)
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}
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return &DB{conn: conn}, nil
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}
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func (d *DB) Close() error {
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return d.conn.Close()
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}
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func (d *DB) Conn() *sql.DB {
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return d.conn
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}
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func (d *DB) Migrate() error {
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if err := d.createMigrationsTable(); err != nil {
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return fmt.Errorf("create migrations table: %w", err)
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}
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entries, err := fs.ReadDir(migrationsFS, "migrations")
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if err != nil {
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return fmt.Errorf("read migrations: %w", err)
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}
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sort.Slice(entries, func(i, j int) bool {
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return entries[i].Name() < entries[j].Name()
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})
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for _, entry := range entries {
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if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".sql") {
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continue
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}
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name := entry.Name()
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applied, err := d.isMigrationApplied(name)
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if err != nil {
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return fmt.Errorf("check migration %s: %w", name, err)
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}
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if applied {
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continue
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}
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content, err := migrationsFS.ReadFile("migrations/" + name)
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if err != nil {
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return fmt.Errorf("read migration %s: %w", name, err)
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}
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if err := d.runMigration(name, string(content)); err != nil {
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return fmt.Errorf("apply migration %s: %w", name, err)
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}
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}
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return nil
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}
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func (d *DB) createMigrationsTable() error {
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_, err := d.conn.Exec(`
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CREATE TABLE IF NOT EXISTS schema_migrations (
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name TEXT PRIMARY KEY,
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applied_at TEXT NOT NULL DEFAULT (datetime('now'))
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)
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`)
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return err
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}
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func (d *DB) isMigrationApplied(name string) (bool, error) {
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var count int
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err := d.conn.QueryRow(
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"SELECT COUNT(*) FROM schema_migrations WHERE name = ?",
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name,
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).Scan(&count)
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if err != nil {
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return false, err
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}
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return count > 0, nil
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}
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func (d *DB) runMigration(name, content string) error {
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tx, err := d.conn.Begin()
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if err != nil {
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return fmt.Errorf("begin transaction: %w", err)
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}
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defer tx.Rollback()
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if _, err := tx.Exec(content); err != nil {
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return fmt.Errorf("execute: %w", err)
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}
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if _, err := tx.Exec(
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"INSERT INTO schema_migrations (name) VALUES (?)",
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name,
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); err != nil {
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return fmt.Errorf("record migration: %w", err)
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}
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if err := tx.Commit(); err != nil {
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return fmt.Errorf("commit: %w", err)
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}
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return nil
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}
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