bbgo_origin/pkg/migrations/20201105093056_orders_add_index.go

package migrations

import (
	"database/sql"
	"context"

	"github.com/c9s/rockhopper"
)

func init() {
	rockhopper.AddMigration(upOrdersAddIndex, downOrdersAddIndex)
}

func upOrdersAddIndex(ctx context.Context, tx *sql.Tx) (err error) {
	// This code is executed when the migration is applied.

	_, err = tx.ExecContext(ctx, "CREATE INDEX orders_symbol ON orders (exchange, symbol);")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE UNIQUE INDEX orders_order_id ON orders (order_id, exchange);")
	if err != nil {
		return err
	}

	return err
}

func downOrdersAddIndex(ctx context.Context, tx *sql.Tx) (err error) {
	// This code is executed when the migration is rolled back.

	_, err = tx.ExecContext(ctx, "DROP INDEX orders_symbol ON orders;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DROP INDEX orders_order_id ON orders;")
	if err != nil {
		return err
	}

	return err
}