diff --git a/src/group-manager-db.cpp b/src/group-manager-db.cpp
new file mode 100644
index 0000000..7a955b5
--- /dev/null
+++ b/src/group-manager-db.cpp
@@ -0,0 +1,331 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California
+ *
+ * This file is part of ndn-group-encrypt (Group-based Encryption Protocol for NDN).
+ * See AUTHORS.md for complete list of ndn-group-encrypt authors and contributors.
+ *
+ * ndn-group-encrypt 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.
+ *
+ * ndn-group-encrypt 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
+ * ndn-group-encrypt, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author Zhiyi Zhang <dreamerbarrychang@gmail.com>
+ */
+
+#include "group-manager-db.hpp"
+
+#include <sqlite3.h>
+#include <boost/filesystem.hpp>
+#include <ndn-cxx/util/sqlite3-statement.hpp>
+#include <ndn-cxx/security/identity-certificate.hpp>
+
+namespace ndn {
+namespace gep {
+
+using util::Sqlite3Statement;
+
+static const std::string INITIALIZATION =
+  "CREATE TABLE IF NOT EXISTS                         \n"
+  "  schedules(                                       \n"
+  "    schedule_id         INTEGER PRIMARY KEY,       \n"
+  "    schedule_name       TEXT NOT NULL,             \n"
+  "    schedule            BLOB NOT NULL              \n"
+  "  );                                               \n"
+  "CREATE UNIQUE INDEX IF NOT EXISTS                  \n"
+  "   scheduleNameIndex ON schedules(schedule_name);  \n"
+  "                                                   \n"
+  "CREATE TABLE IF NOT EXISTS                         \n"
+  "  members(                                         \n"
+  "    member_id           INTEGER PRIMARY KEY,       \n"
+  "    schedule_id         INTEGER NOT NULL,          \n"
+  "    member_name         BLOB NOT NULL,             \n"
+  "    member_cert         BLOB NOT NULL,             \n"
+  "    FOREIGN KEY(schedule_id)                       \n"
+  "      REFERENCES schedules(schedule_id)            \n"
+  "      ON DELETE CASCADE                            \n"
+  "      ON UPDATE CASCADE                            \n"
+  "  );                                               \n"
+  "CREATE UNIQUE INDEX IF NOT EXISTS                  \n"
+  "   memNameIndex ON members(member_name);           \n";
+
+class GroupManagerDB::Impl
+{
+public:
+  Impl(const std::string& dbDir)
+  {
+    // open Database
+
+    int result = sqlite3_open_v2(dbDir.c_str(), &m_database,
+                                 SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
+#ifdef NDN_CXX_DISABLE_SQLITE3_FS_LOCKING
+                                 "unix-dotfile"
+#else
+                                 nullptr
+#endif
+                                 );
+
+    if (result != SQLITE_OK)
+      BOOST_THROW_EXCEPTION(Error("GroupManager DB cannot be opened/created: " + dbDir));
+
+    // enable foreign key
+    sqlite3_exec(m_database, "PRAGMA foreign_keys = ON", nullptr, nullptr, nullptr);
+
+    // initialize database specific tables
+    char* errorMessage = nullptr;
+    result = sqlite3_exec(m_database, INITIALIZATION.c_str(), nullptr, nullptr, &errorMessage);
+    if (result != SQLITE_OK && errorMessage != nullptr) {
+      sqlite3_free(errorMessage);
+      BOOST_THROW_EXCEPTION(Error("GroupManager DB cannot be initialized"));
+    }
+  }
+
+  ~Impl()
+  {
+    sqlite3_close(m_database);
+  }
+
+  int
+  getScheduleId(const std::string& name) const
+  {
+    Sqlite3Statement statement(m_database,
+                               "SELECT schedule_id FROM schedules WHERE schedule_name=?");
+    statement.bind(1, name, SQLITE_TRANSIENT);
+
+    int result = -1;
+    if (statement.step() == SQLITE_ROW)
+      result = statement.getInt(0);
+    return result;
+  }
+
+public:
+  sqlite3* m_database;
+};
+
+GroupManagerDB::GroupManagerDB(const std::string& dbDir)
+  : m_impl(new Impl(dbDir))
+{
+}
+
+GroupManagerDB::~GroupManagerDB() = default;
+
+bool
+GroupManagerDB::hasSchedule(const std::string& name) const
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT schedule_id FROM schedules where schedule_name=?");
+  statement.bind(1, name, SQLITE_TRANSIENT);
+  return (statement.step() == SQLITE_ROW);
+}
+
+std::list<std::string>
+GroupManagerDB::listAllScheduleNames() const
+{
+  std::list<std::string> result;
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT schedule_name FROM schedules");
+
+  result.clear();
+  while (statement.step() == SQLITE_ROW) {
+    result.push_back(statement.getString(0));
+  }
+  return result;
+}
+
+Schedule
+GroupManagerDB::getSchedule(const std::string& name) const
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT schedule FROM schedules where schedule_name=?");
+  statement.bind(1, name, SQLITE_TRANSIENT);
+
+  Schedule result;
+  if (statement.step() == SQLITE_ROW) {
+    result.wireDecode(statement.getBlock(0));
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Cannot get the result from database"));
+  }
+  return result;
+}
+
+std::map<Name, Data>
+GroupManagerDB::getScheduleMembers(const std::string& name) const
+{
+  std::map<Name, Data> result;
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT member_name, member_cert\
+                              FROM members JOIN schedules\
+                              ON members.schedule_id=schedules.schedule_id\
+                              WHERE schedule_name=?");
+  statement.bind(1, name, SQLITE_TRANSIENT);
+
+  result.clear();
+  while (statement.step() == SQLITE_ROW) {
+    result.insert(std::pair<Name, Data>(Name(statement.getBlock(0)),
+                                        Data(statement.getBlock(1))));
+  }
+  return result;
+}
+
+void
+GroupManagerDB::addSchedule(const std::string& name, const Schedule& schedule)
+{
+  BOOST_ASSERT(name.length() != 0);
+
+  Sqlite3Statement statement(m_impl->m_database,
+                             "INSERT INTO schedules (schedule_name, schedule)\
+                              values (?, ?)");
+  statement.bind(1, name, SQLITE_TRANSIENT);
+  statement.bind(2, schedule.wireEncode(), SQLITE_TRANSIENT);
+  if (statement.step() != SQLITE_DONE)
+    BOOST_THROW_EXCEPTION(Error("Cannot add the schedule to database"));
+}
+
+void
+GroupManagerDB::deleteSchedule(const std::string& name)
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "DELETE FROM schedules WHERE schedule_name=?");
+  statement.bind(1, name, SQLITE_TRANSIENT);
+  statement.step();
+}
+
+void
+GroupManagerDB::renameSchedule(const std::string& oldName, const std::string& newName)
+{
+  BOOST_ASSERT(newName.length() != 0);
+
+  Sqlite3Statement statement(m_impl->m_database,
+                             "UPDATE schedules SET schedule_name=? WHERE schedule_name=?");
+  statement.bind(1, newName, SQLITE_TRANSIENT);
+  statement.bind(2, oldName, SQLITE_TRANSIENT);
+  if (statement.step() != SQLITE_DONE)
+    BOOST_THROW_EXCEPTION(Error("Cannot rename the schedule from database"));
+}
+
+void
+GroupManagerDB::updateSchedule(const std::string& name, const Schedule& schedule)
+{
+  if (!hasSchedule(name)) {
+    addSchedule(name, schedule);
+    return;
+  }
+
+  Sqlite3Statement statement(m_impl->m_database,
+                             "UPDATE schedules SET schedule=? WHERE schedule_name=?");
+  statement.bind(1, schedule.wireEncode(), SQLITE_TRANSIENT);
+  statement.bind(2, name, SQLITE_TRANSIENT);
+  statement.step();
+}
+
+bool
+GroupManagerDB::hasMember(const Name& identity) const
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT member_id FROM members WHERE member_name=?");
+  statement.bind(1, identity.wireEncode(), SQLITE_TRANSIENT);
+  return (statement.step() == SQLITE_ROW);
+}
+
+std::list<Name>
+GroupManagerDB::listAllMembers() const
+{
+  std::list<Name> result;
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT member_name FROM members");
+
+  result.clear();
+  while (statement.step() == SQLITE_ROW) {
+    result.push_back(Name(statement.getBlock(0)));
+  }
+  return result;
+}
+
+Data
+GroupManagerDB::getMemberCert(const Name& identity) const
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT member_cert FROM members WHERE member_name=?");
+  statement.bind(1, identity.wireEncode(), SQLITE_TRANSIENT);
+  Data result;
+  if (statement.step() == SQLITE_ROW) {
+    result.wireDecode(statement.getBlock(0));
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Cannot get the result from database"));
+  }
+  return result;
+}
+
+std::string
+GroupManagerDB::getMemberSchedule(const Name& identity) const
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "SELECT schedule_name\
+                              FROM schedules JOIN members\
+                              ON schedules.schedule_id = members.schedule_id\
+                              WHERE member_name=?");
+  statement.bind(1, identity.wireEncode(), SQLITE_TRANSIENT);
+
+  std::string result = "";
+  if (statement.step() == SQLITE_ROW) {
+    result = statement.getString(0);
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Cannot get the result from database"));
+  }
+  return result;
+}
+
+void
+GroupManagerDB::addMember(const std::string& scheduleName, const Data& certificate)
+{
+  int scheduleId = m_impl->getScheduleId(scheduleName);
+  if (scheduleId == -1)
+    BOOST_THROW_EXCEPTION(Error("The schedule dose not exist"));
+
+  IdentityCertificate cert(certificate);
+  Name memberName = cert.getPublicKeyName().getPrefix(-1);
+
+  Sqlite3Statement statement(m_impl->m_database,
+                             "INSERT INTO members(schedule_id, member_name, member_cert)\
+                              values (?, ?, ?)");
+  statement.bind(1, scheduleId);
+  statement.bind(2, memberName.wireEncode(), SQLITE_TRANSIENT);
+  statement.bind(3, certificate.wireEncode(), SQLITE_TRANSIENT);
+  if (statement.step() != SQLITE_DONE)
+    BOOST_THROW_EXCEPTION(Error("Cannot add the member to database"));
+}
+
+void
+GroupManagerDB::updateMemberSchedule(const Name& identity, const std::string& scheduleName)
+{
+  int scheduleId = m_impl->getScheduleId(scheduleName);
+  if (scheduleId == -1)
+    BOOST_THROW_EXCEPTION(Error("The schedule dose not exist"));
+
+  Sqlite3Statement statement(m_impl->m_database,
+                             "UPDATE members SET schedule_id=? WHERE member_name=?");
+  statement.bind(1, scheduleId);
+  statement.bind(2, identity.wireEncode(), SQLITE_TRANSIENT);
+  statement.step();
+}
+
+void
+GroupManagerDB::deleteMember(const Name& identity)
+{
+  Sqlite3Statement statement(m_impl->m_database,
+                             "DELETE FROM members WHERE member_name=?");
+  statement.bind(1, identity.wireEncode(), SQLITE_TRANSIENT);
+  statement.step();
+}
+
+} // namespace gep
+} // namespace ndn