实现增量扫描

migrations/004_add_incremental_scan_fields.go

@@ -0,0 +1,73 @@
+package migrations
+
+import (
+	"database/sql"
+)
+
+func init() {
+	RegisterMigration(
+		4,
+		"Add incremental scan fields",
+		migrateAddIncrementalScanFieldsUp,
+		migrateAddIncrementalScanFieldsDown,
+	)
+}
+
+func migrateAddIncrementalScanFieldsUp(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+		ALTER TABLE media_files ADD COLUMN file_mtime_ns INTEGER DEFAULT 0
+	`)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec(`
+		ALTER TABLE media_files ADD COLUMN last_seen_at TIMESTAMP
+	`)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func migrateAddIncrementalScanFieldsDown(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+		CREATE TABLE media_files_old (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			path TEXT NOT NULL,
+			library_id INTEGER NOT NULL,
+			file_size INTEGER DEFAULT 0,
+			format TEXT DEFAULT '',
+			bit_rate INTEGER DEFAULT 0,
+			sample_rate INTEGER DEFAULT 0,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+			updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+			FOREIGN KEY (library_id) REFERENCES libraries(id) ON DELETE CASCADE
+		)
+	`)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec(`
+		INSERT INTO media_files_old (id, path, library_id, file_size, format, bit_rate, sample_rate, created_at, updated_at)
+		SELECT id, path, library_id, file_size, format, bit_rate, sample_rate, created_at, updated_at
+		FROM media_files
+	`)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec("DROP TABLE media_files")
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec("ALTER TABLE media_files_old RENAME TO media_files")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}