package migrate_test

import (
	"database/sql"

	_ "github.com/mattn/go-sqlite3"
	"github.com/remind101/migrate"
)

func Example() {
	migrations := []migrate.Migration{
		{
			ID: 1,
			Up: func(tx *sql.Tx) error {
				_, err := tx.Exec("CREATE TABLE people (id int)")
				return err
			},
			Down: func(tx *sql.Tx) error {
				_, err := tx.Exec("DROP TABLE people")
				return err
			},
		},
		{
			ID: 2,
			// For simple sql migrations, you can use the migrate.Queries
			// helper.
			Up: migrate.Queries([]string{
				"ALTER TABLE people ADD COLUMN first_name text",
			}),
			Down: func(tx *sql.Tx) error {
				// It's not possible to remove a column with
				// sqlite.
				_, err := tx.Exec("SELECT 1 FROM people")
				return err
			},
		},
	}

	db, _ := sql.Open("sqlite3", ":memory:")
	_ = migrate.Exec(db, migrate.Up, migrations...)
}