void ovsdb_idl_txn_read(const struct ovsdb_idl_row *,
const struct ovsdb_idl_column *,
struct ovsdb_datum *);
void ovsdb_idl_txn_write(const struct ovsdb_idl_row *,
const struct ovsdb_idl_column *,
struct ovsdb_datum *);
void ovsdb_idl_txn_read(const struct ovsdb_idl_row *,
const struct ovsdb_idl_column *,
struct ovsdb_datum *);
void ovsdb_idl_txn_write(const struct ovsdb_idl_row *,
const struct ovsdb_idl_column *,
struct ovsdb_datum *);