pkg database/sql, const LevelWriteCommitted = 3
pkg database/sql, const LevelWriteCommitted IsolationLevel
pkg database/sql/driver, type ConnBeginTx interface { BeginTx }
pkg database/sql/driver, type ConnBeginTx interface, BeginTx(context.Context, TxOptions) (Tx, error)
pkg database/sql/driver, type ConnPrepareContext interface { PrepareContext }

	if len(opts) > 0 {
		opt = opts[0]
	}

	switch beginner := tx.Statement.ConnPool.(type) {
	case TxBeginner:
		tx.Statement.ConnPool, err = beginner.BeginTx(tx.Statement.Context, opt)
	case ConnPoolBeginner:
		tx.Statement.ConnPool, err = beginner.BeginTx(tx.Statement.Context, opt)
	default:
		err = ErrInvalidTransaction
	}

	if err != nil {
		tx.AddError(err)
	}

	return tx
}

pkg crypto, const BLAKE2b_512 Hash
pkg crypto, const BLAKE2s_256 = 16
pkg crypto, const BLAKE2s_256 Hash
pkg crypto/x509, type Certificate struct, ExcludedDNSDomains []string
pkg database/sql, method (*Conn) BeginTx(context.Context, *TxOptions) (*Tx, error)
pkg database/sql, method (*Conn) Close() error
pkg database/sql, method (*Conn) ExecContext(context.Context, string, ...interface{}) (Result, error)