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diff --git a/src/libknot/db/db.h b/src/libknot/db/db.h
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+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/*!
+ * \file
+ *
+ * \brief Structures for binary data handling.
+ *
+ * \addtogroup db
+ * @{
+ */
+
+#pragma once
+
+#include "libknot/mm_ctx.h"
+
+enum {
+ /* Database flags */
+
+ KNOT_DB_RDONLY = 1 << 0, /*!< Read only. */
+ KNOT_DB_SORTED = 1 << 1, /*!< Sorted output. */
+
+ /* Operations */
+
+ KNOT_DB_NOOP = 1 << 2, /*!< No operation. */
+ KNOT_DB_FIRST = 1 << 3, /*!< First entry. */
+ KNOT_DB_LAST = 1 << 4, /*!< Last entry. */
+ KNOT_DB_NEXT = 1 << 5, /*!< Next entry. */
+ KNOT_DB_PREV = 1 << 6, /*!< Previous entry. */
+ KNOT_DB_LEQ = 1 << 7, /*!< Lesser or equal. */
+ KNOT_DB_GEQ = 1 << 8 /*!< Greater or equal. */
+};
+
+typedef void knot_db_t;
+typedef void knot_db_iter_t;
+
+typedef struct knot_db_val {
+ void *data;
+ size_t len;
+} knot_db_val_t;
+
+typedef struct knot_db_txn {
+ knot_db_t *db;
+ void *txn;
+} knot_db_txn_t;
+
+typedef struct knot_db_api {
+ const char *name;
+
+ /* Context operations */
+
+ int (*init)(knot_db_t **db, knot_mm_t *mm, void *opts);
+ void (*deinit)(knot_db_t *db);
+
+ /* Transactions */
+
+ int (*txn_begin)(knot_db_t *db, knot_db_txn_t *txn, unsigned flags);
+ int (*txn_commit)(knot_db_txn_t *txn);
+ void (*txn_abort)(knot_db_txn_t *txn);
+
+ /* Data access */
+
+ int (*count)(knot_db_txn_t *txn);
+ int (*clear)(knot_db_txn_t *txn);
+ int (*find)(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags);
+ int (*insert)(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags);
+ int (*del)(knot_db_txn_t *txn, knot_db_val_t *key);
+
+ /* Iteration */
+
+ knot_db_iter_t *(*iter_begin)(knot_db_txn_t *txn, unsigned flags);
+ knot_db_iter_t *(*iter_seek)(knot_db_iter_t *iter, knot_db_val_t *key, unsigned flags);
+ knot_db_iter_t *(*iter_next)(knot_db_iter_t *iter);
+ int (*iter_key)(knot_db_iter_t *iter, knot_db_val_t *key);
+ int (*iter_val)(knot_db_iter_t *iter, knot_db_val_t *val);
+ void (*iter_finish)(knot_db_iter_t *iter);
+} knot_db_api_t;
+
+/*! @} */