diff --git a/src/daemon/db-mgr.cpp b/src/daemon/db-mgr.cpp
new file mode 100644
index 0000000..35af5de
--- /dev/null
+++ b/src/daemon/db-mgr.cpp
@@ -0,0 +1,393 @@
+/* -*- 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/>.
+ */
+
+#include "db-mgr.hpp"
+#include "logger.hpp"
+#include "clients/response.hpp"
+
+#include <iostream>
+#include <fstream>
+
+namespace ndn {
+namespace ndns {
+
+NDNS_LOG_INIT("DbMgr");
+
+static const std::string NDNS_SCHEMA = "\
+CREATE TABLE IF NOT EXISTS zones (      \n\
+  id    INTEGER NOT NULL PRIMARY KEY,   \n\
+  name  blob NOT NULL UNIQUE,           \n\
+  ttl   integer(10) NOT NULL);          \n\
+                                        \n\
+CREATE TABLE IF NOT EXISTS rrsets (     \n\
+  id      INTEGER NOT NULL PRIMARY KEY, \n\
+  zone_id integer(10) NOT NULL,         \n\
+  label   blob NOT NULL,                \n\
+  type    blob NOT NULL,                \n\
+  version blob NOT NULL,                \n\
+  ttl     integer(10) NOT NULL,         \n\
+  data    blob NOT NULL,                                                \n\
+  FOREIGN KEY(zone_id) REFERENCES zones(id) ON UPDATE Cascade ON DELETE Cascade); \n\
+                                                                        \n\
+CREATE UNIQUE INDEX rrsets_zone_id_label_type_version                   \n\
+  ON rrsets (zone_id, label, type, version);                            \n\
+";
+
+DbMgr::DbMgr(const std::string& dbFile/* = DEFAULT_CONFIG_PATH "/" "ndns.db"*/)
+  : m_dbFile(dbFile)
+  , m_conn(0)
+{
+  if (dbFile.empty())
+    m_dbFile = DEFAULT_DATABASE_PATH "/" "ndns.db";
+
+  this->open();
+
+  NDNS_LOG_INFO("open database: " << m_dbFile);
+}
+
+
+DbMgr::~DbMgr()
+{
+  if (m_conn != 0) {
+    this->close();
+  }
+}
+
+void
+DbMgr::open()
+{
+  int res = sqlite3_open_v2(m_dbFile.c_str(), &m_conn,
+                            SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
+#ifdef DISABLE_SQLITE3_FS_LOCKING
+                            "unix-dotfile"
+#else
+                            0
+#endif
+                            );
+
+  if (res != SQLITE_OK) {
+    NDNS_LOG_FATAL("Cannot open the db file: " << m_dbFile);
+    throw ConnectError("Cannot open the db file: " + m_dbFile);
+  }
+  // ignore any errors from DB creation (command will fail for the existing database, which is ok)
+  sqlite3_exec(m_conn, NDNS_SCHEMA.c_str(), 0, 0, 0);
+}
+
+void
+DbMgr::close()
+{
+  if (m_conn == 0)
+    return;
+
+  int ret = sqlite3_close(m_conn);
+  if (ret != SQLITE_OK) {
+    NDNS_LOG_FATAL("Cannot close the db: " << m_dbFile);
+  }
+  else {
+    m_conn = 0;
+    NDNS_LOG_INFO("Close database: " << m_dbFile);
+  }
+}
+
+void
+DbMgr::clearAllData()
+{
+  const char* sql = "DELETE FROM zones; DELETE FROM rrsets;";
+
+  int rc = sqlite3_exec(m_conn, sql, 0, 0, 0); // sqlite3_step cannot execute multiple SQL statement
+  if (rc != SQLITE_OK) {
+    throw ExecuteError(sql);
+  }
+
+  NDNS_LOG_INFO("clear all the data in the database: " << m_dbFile);
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Zone
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+void
+DbMgr::insert(Zone& zone)
+{
+  if (zone.getId() > 0)
+    return;
+
+  sqlite3_stmt* stmt;
+  const char* sql = "INSERT INTO zones (name, ttl) VALUES (?, ?)";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  const Block& zoneName = zone.getName().wireEncode();
+  sqlite3_bind_blob(stmt, 1, zoneName.wire(), zoneName.size(), SQLITE_STATIC);
+  sqlite3_bind_int(stmt,  2, zone.getTtl().count());
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    sqlite3_finalize(stmt);
+    throw ExecuteError(sql);
+  }
+
+  zone.setId(sqlite3_last_insert_rowid(m_conn));
+  sqlite3_finalize(stmt);
+}
+
+bool
+DbMgr::find(Zone& zone)
+{
+  sqlite3_stmt* stmt;
+  const char* sql = "SELECT id, ttl FROM zones WHERE name=?";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  const Block& zoneName = zone.getName().wireEncode();
+  sqlite3_bind_blob(stmt, 1, zoneName.wire(), zoneName.size(), SQLITE_STATIC);
+
+  if (sqlite3_step(stmt) == SQLITE_ROW) {
+    zone.setId(sqlite3_column_int64(stmt, 0));
+    zone.setTtl(time::seconds(sqlite3_column_int(stmt, 1)));
+  } else {
+    zone.setId(0);
+  }
+
+  sqlite3_finalize(stmt);
+
+  return zone.getId() != 0;
+}
+
+void
+DbMgr::remove(Zone& zone)
+{
+  if (zone.getId() == 0)
+    return;
+
+  sqlite3_stmt* stmt;
+  const char* sql = "DELETE FROM zones where id=?";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  sqlite3_bind_int64(stmt, 1, zone.getId());
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    sqlite3_finalize(stmt);
+    throw ExecuteError(sql);
+  }
+
+  sqlite3_finalize(stmt);
+
+  zone = Zone();
+}
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Rrset
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+void
+DbMgr::insert(Rrset& rrset)
+{
+  if (rrset.getId() != 0)
+    return;
+
+  if (rrset.getZone() == 0) {
+    throw RrsetError("Rrset has not been assigned to a zone");
+  }
+
+  if (rrset.getZone()->getId() == 0) {
+    insert(*rrset.getZone());
+  }
+
+  const char* sql =
+    "INSERT INTO rrsets (zone_id, label, type, version, ttl, data)"
+    "    VALUES (?, ?, ?, ?, ?, ?)";
+
+  sqlite3_stmt* stmt;
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  sqlite3_bind_int64(stmt, 1, rrset.getZone()->getId());
+
+  const Block& label = rrset.getLabel().wireEncode();
+  sqlite3_bind_blob(stmt,  2, label.wire(),              label.size(),              SQLITE_STATIC);
+  sqlite3_bind_blob(stmt,  3, rrset.getType().wire(),    rrset.getType().size(),    SQLITE_STATIC);
+  sqlite3_bind_blob(stmt,  4, rrset.getVersion().wire(), rrset.getVersion().size(), SQLITE_STATIC);
+  sqlite3_bind_int64(stmt, 5, rrset.getTtl().count());
+  sqlite3_bind_blob(stmt,  6, rrset.getData().wire(),    rrset.getData().size(),    SQLITE_STATIC);
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    sqlite3_finalize(stmt);
+    throw ExecuteError(sql);
+  }
+
+  rrset.setId(sqlite3_last_insert_rowid(m_conn));
+  sqlite3_finalize(stmt);
+}
+
+bool
+DbMgr::find(Rrset& rrset)
+{
+  if (rrset.getZone() == 0) {
+    throw RrsetError("Rrset has not been assigned to a zone");
+  }
+
+  if (rrset.getZone()->getId() == 0) {
+    bool isFound = find(*rrset.getZone());
+    if (!isFound) {
+      return false;
+    }
+  }
+
+  sqlite3_stmt* stmt;
+  const char* sql =
+    "SELECT id, ttl, version, data FROM rrsets"
+    "    WHERE zone_id=? and label=? and type=?";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  sqlite3_bind_int64(stmt, 1, rrset.getZone()->getId());
+
+  const Block& label = rrset.getLabel().wireEncode();
+  sqlite3_bind_blob(stmt, 2, label.wire(), label.size(), SQLITE_STATIC);
+  sqlite3_bind_blob(stmt, 3, rrset.getType().wire(), rrset.getType().size(), SQLITE_STATIC);
+
+  if (sqlite3_step(stmt) == SQLITE_ROW) {
+    rrset.setId(sqlite3_column_int64(stmt, 0));
+    rrset.setTtl(time::seconds(sqlite3_column_int64(stmt, 1)));
+    rrset.setVersion(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 2)),
+                           sqlite3_column_bytes(stmt, 2)));
+    rrset.setData(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 3)),
+                        sqlite3_column_bytes(stmt, 3)));
+  } else {
+    rrset.setId(0);
+  }
+  sqlite3_finalize(stmt);
+
+  return rrset.getId() != 0;
+}
+
+std::vector<Rrset>
+DbMgr::findRrsets(Zone& zone)
+{
+  if (zone.getId() == 0)
+    find(zone);
+
+  if (zone.getId() == 0)
+    throw RrsetError("Attempting to find all the rrsets with a zone does not in the database");
+
+  std::vector<Rrset> vec;
+  sqlite3_stmt* stmt;
+  const char* sql = "SELECT id, ttl, version, data, label, type "
+                    "FROM rrsets where zone_id=? ";
+
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+  sqlite3_bind_int64(stmt, 1, zone.getId());
+
+  while (sqlite3_step(stmt) == SQLITE_ROW) {
+    vec.emplace_back(&zone);
+    Rrset& rrset = vec.back();
+
+    rrset.setId(sqlite3_column_int64(stmt, 0));
+    rrset.setTtl(time::seconds(sqlite3_column_int64(stmt, 1)));
+    rrset.setVersion(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 2)),
+                           sqlite3_column_bytes(stmt, 2)));
+    rrset.setData(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 3)),
+                        sqlite3_column_bytes(stmt, 3)));
+    rrset.setLabel(Name(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 4)),
+                         sqlite3_column_bytes(stmt, 4))));
+    rrset.setType(Block(static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 5)),
+                  sqlite3_column_bytes(stmt, 5)));
+  }
+  sqlite3_finalize(stmt);
+
+  return vec;
+}
+
+
+void
+DbMgr::remove(Rrset& rrset)
+{
+  if (rrset.getId() == 0)
+    throw RrsetError("Attempting to remove Rrset that has no assigned id");
+
+  sqlite3_stmt* stmt;
+  const char* sql = "DELETE FROM rrsets WHERE id=?";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  sqlite3_bind_int64(stmt, 1, rrset.getId());
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    sqlite3_finalize(stmt);
+    throw ExecuteError(sql);
+  }
+
+  sqlite3_finalize(stmt);
+
+  rrset = Rrset(rrset.getZone());
+}
+
+void
+DbMgr::update(Rrset& rrset)
+{
+  if (rrset.getId() == 0) {
+    throw RrsetError("Attempting to replace Rrset that has no assigned id");
+  }
+
+  if (rrset.getZone() == 0) {
+    throw RrsetError("Rrset has not been assigned to a zone");
+  }
+
+  sqlite3_stmt* stmt;
+  const char* sql = "UPDATE rrsets SET ttl=?, version=?, data=? WHERE id=?";
+  int rc = sqlite3_prepare_v2(m_conn, sql, -1, &stmt, 0);
+
+  if (rc != SQLITE_OK) {
+    throw PrepareError(sql);
+  }
+
+  sqlite3_bind_int64(stmt, 1, rrset.getTtl().count());
+  sqlite3_bind_blob(stmt,  2, rrset.getVersion().wire(), rrset.getVersion().size(), SQLITE_STATIC);
+  sqlite3_bind_blob(stmt,  3, rrset.getData().wire(),    rrset.getData().size(),    SQLITE_STATIC);
+  sqlite3_bind_int64(stmt, 4, rrset.getId());
+
+  sqlite3_step(stmt);
+  sqlite3_finalize(stmt);
+}
+
+} // namespace ndns
+} // namespace ndn
diff --git a/src/daemon/db-mgr.hpp b/src/daemon/db-mgr.hpp
new file mode 100644
index 0000000..ca83691
--- /dev/null
+++ b/src/daemon/db-mgr.hpp
@@ -0,0 +1,188 @@
+/* -*- 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