bbgo_origin/pkg/migrations/sqlite3/main_20200819054742_trade_index.go

package sqlite3

import (
	"context"

	"github.com/c9s/rockhopper/v2"
)

func init() {
	AddMigration("main", up_main_tradeIndex, down_main_tradeIndex)
}

func up_main_tradeIndex(ctx context.Context, tx rockhopper.SQLExecutor) (err error) {
	// This code is executed when the migration is applied.
	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol ON trades(symbol);")
	if err != nil {
		return err
	}
	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol_fee_currency ON trades(symbol, fee_currency, traded_at);")
	if err != nil {
		return err
	}
	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_traded_at_symbol ON trades(traded_at, symbol);")
	if err != nil {
		return err
	}
	return err
}

func down_main_tradeIndex(ctx context.Context, tx rockhopper.SQLExecutor) (err error) {
	// This code is executed when the migration is rolled back.
	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol;")
	if err != nil {
		return err
	}
	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol_fee_currency;")
	if err != nil {
		return err
	}
	_, err = tx.ExecContext(ctx, "DROP INDEX trades_traded_at_symbol;")
	if err != nil {
		return err
	}
	return err
}