diff --git a/src/daemon/db-mgr.hpp b/src/daemon/db-mgr.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014, Regents of the University of California.
+ *
+ * This file is part of NDNS (Named Data Networking Domain Name Service).
+ * See AUTHORS.md for complete list of NDNS authors and contributors.
+ *
+ * NDNS 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.
+ *
+ * NDNS 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
+ * NDNS, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NDNS_DAEMON_DB_MGR_HPP
+#define NDNS_DAEMON_DB_MGR_HPP
+
+#include "config.hpp"
+#include "zone.hpp"
+#include "rrset.hpp"
+
+#include <ndn-cxx/common.hpp>
+#include <sqlite3.h>
+
+namespace ndn {
+namespace ndns {
+
+#define DEFINE_ERROR(ErrorName, Base)           \
+class ErrorName : public Base                   \
+{                                               \
+ public:                                        \
+  explicit                                      \
+  ErrorName(const std::string& what)            \
+    : Base(what)                                \
+  {                                             \
+  }                                             \
+};
+
+
+
+/**
+ * @brief Database Manager, provides CRUD operations on stored entities
+ *
+ * @note Method names follow MongoDB convention: insert/remove/find/update
+ */
+class DbMgr : noncopyable
+{
+public:
+
+  /**
+   * @brief The Database Status
+   */
+  enum DbStatus {
+    DB_CONNECTED,
+    DB_CLOSED,
+    DB_ERROR
+  };
+
+  DEFINE_ERROR(Error, std::runtime_error);
+  DEFINE_ERROR(PrepareError, Error);
+  DEFINE_ERROR(ExecuteError, Error);
+  DEFINE_ERROR(ConnectError, Error);
+
+public:
+  explicit
+  DbMgr(const std::string& dbFile = DEFAULT_DATABASE_PATH "/" "ndns.db");
+
+  ~DbMgr();
+
+  /**
+   * @brief connect to the database. If it's already opened, do nothing.
+   */
+  void
+  open();
+
+  /**
+   * @brief close the database connection. Do nothing if it's already closed.
+   * Destructor would automatically close the database connection as well.
+   */
+  void
+  close();
+
+  /**
+  * @brief clear all the data in the database
+  */
+  void
+  clearAllData();
+
+public: // Zone manipulation
+  DEFINE_ERROR(ZoneError, Error);
+
+  /**
+   * @brief insert the m_zone to the database, and set the zone's id.
+   * If the zone is already in the db, handle the exception without leaving it to upper level,
+   * meanwhile, set the zone's id too.
+   * @pre m_zone.getId() == 0
+   * @post m_zone.getId() > 0
+   */
+  void
+  insert(Zone& zone);
+
+  /**
+   * @brief lookup the zone by name, fill the m_id and m_ttl
+   * @post whatever the previous id is
+   * @return true if the record exist
+   */
+  bool
+  find(Zone& zone);
+
+  /**
+   * @brief remove the zone
+   * @pre m_zone.getId() > 0
+   * @post m_zone.getId() == 0
+   */
+  void
+  remove(Zone& zone);
+
+public: // Rrset manipulation
+  DEFINE_ERROR(RrsetError, Error);
+
+  /**
+   * @brief add the rrset
+   * @pre m_rrset.getId() == 0
+   * @post m_rrset.getId() > 0
+   */
+  void
+  insert(Rrset& rrset);
+
+  /**
+   * @brief get the data from db according to `m_zone`, `m_label`, `m_type`.
+   *
+   * If record exists, `m_ttl`, `m_version` and `m_data` is set
+   *
+   * @pre m_rrset.getZone().getId() > 0
+   * @post whatever the previous id is,
+   *       m_rrset.getId() > 0 if record exists, otherwise m_rrset.getId() == 0
+   * @return true if the record exist
+   */
+  bool
+  find(Rrset& rrset);
+
+  /**
+   * @brief get all the rrsets which is stored at given zone
+   * @throw RrsetError() if zone does not exist in the database
+   * @note if zone.getId() == 0, the function setId for the zone automatically
+   * @note all returned rrsets' m_zone point to the memory of the param[in] zone
+   */
+  std::vector<Rrset>
+  findRrsets(Zone& zone);
+
+  /**
+   * @brief remove the rrset
+   * @pre m_rrset.getId() > 0
+   * @post m_rrset.getId() == 0
+   */
+  void
+  remove(Rrset& rrset);
+
+  /**
+   * @brief replace ttl, version, and Data with new values
+   * @pre m_rrset.getId() > 0
+   */
+  void
+  update(Rrset& rrset);
+
+  ////////////////////////////////
+  ////////getter and setter
+public:
+  const std::string&
+  getDbFile() const
+  {
+    return m_dbFile;
+  }
+
+private:
+  std::string m_dbFile;
+  sqlite3* m_conn;
+};
+
+} // namespace ndns
+} // namespace ndn
+
+#endif // NDNS_DAEMON_DB_MGR_HPP