--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Resources/Graveyard/DatabasePluginSample/DatabaseWrapperBase.cpp	Tue Jul 17 11:25:54 2018 +0200
@@ -0,0 +1,757 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 Osimis S.A., Belgium
+ *
+ * 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.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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/>.
+ **/
+
+
+#include "PrecompiledHeadersServer.h"
+#include "DatabaseWrapperBase.h"
+
+#include <stdio.h>
+#include <memory>
+
+namespace Orthanc
+{
+  void DatabaseWrapperBase::SetGlobalProperty(GlobalProperty property,
+                                              const std::string& value)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT OR REPLACE INTO GlobalProperties VALUES(?, ?)");
+    s.BindInt(0, property);
+    s.BindString(1, value);
+    s.Run();
+  }
+
+  bool DatabaseWrapperBase::LookupGlobalProperty(std::string& target,
+                                                 GlobalProperty property)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT value FROM GlobalProperties WHERE property=?");
+    s.BindInt(0, property);
+
+    if (!s.Step())
+    {
+      return false;
+    }
+    else
+    {
+      target = s.ColumnString(0);
+      return true;
+    }
+  }
+
+  int64_t DatabaseWrapperBase::CreateResource(const std::string& publicId,
+                                              ResourceType type)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO Resources VALUES(NULL, ?, ?, NULL)");
+    s.BindInt(0, type);
+    s.BindString(1, publicId);
+    s.Run();
+    return db_.GetLastInsertRowId();
+  }
+
+  bool DatabaseWrapperBase::LookupResource(int64_t& id,
+                                           ResourceType& type,
+                                           const std::string& publicId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT internalId, resourceType FROM Resources WHERE publicId=?");
+    s.BindString(0, publicId);
+
+    if (!s.Step())
+    {
+      return false;
+    }
+    else
+    {
+      id = s.ColumnInt(0);
+      type = static_cast<ResourceType>(s.ColumnInt(1));
+
+      // Check whether there is a single resource with this public id
+      assert(!s.Step());
+
+      return true;
+    }
+  }
+
+  ErrorCode DatabaseWrapperBase::LookupParent(bool& found,
+                                              int64_t& parentId,
+                                              int64_t resourceId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT parentId FROM Resources WHERE internalId=?");
+    s.BindInt64(0, resourceId);
+
+    if (!s.Step())
+    {
+      return ErrorCode_UnknownResource;
+    }
+
+    if (s.ColumnIsNull(0))
+    {
+      found = false;
+    }
+    else
+    {
+      found = true;
+      parentId = s.ColumnInt(0);
+    }
+
+    return ErrorCode_Success;
+  }
+
+  bool DatabaseWrapperBase::GetPublicId(std::string& result,
+                                        int64_t resourceId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT publicId FROM Resources WHERE internalId=?");
+    s.BindInt64(0, resourceId);
+    
+    if (!s.Step())
+    { 
+      return false;
+    }
+    else
+    {
+      result = s.ColumnString(0);
+      return true;
+    }
+  }
+
+
+  ErrorCode DatabaseWrapperBase::GetResourceType(ResourceType& result,
+                                                 int64_t resourceId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT resourceType FROM Resources WHERE internalId=?");
+    s.BindInt64(0, resourceId);
+    
+    if (s.Step())
+    {
+      result = static_cast<ResourceType>(s.ColumnInt(0));
+      return ErrorCode_Success;
+    }
+    else
+    { 
+      return ErrorCode_UnknownResource;
+    }
+  }
+
+
+  void DatabaseWrapperBase::AttachChild(int64_t parent,
+                                        int64_t child)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "UPDATE Resources SET parentId = ? WHERE internalId = ?");
+    s.BindInt64(0, parent);
+    s.BindInt64(1, child);
+    s.Run();
+  }
+
+
+  void DatabaseWrapperBase::SetMetadata(int64_t id,
+                                        MetadataType type,
+                                        const std::string& value)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT OR REPLACE INTO Metadata VALUES(?, ?, ?)");
+    s.BindInt64(0, id);
+    s.BindInt(1, type);
+    s.BindString(2, value);
+    s.Run();
+  }
+
+  void DatabaseWrapperBase::DeleteMetadata(int64_t id,
+                                           MetadataType type)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM Metadata WHERE id=? and type=?");
+    s.BindInt64(0, id);
+    s.BindInt(1, type);
+    s.Run();
+  }
+
+  bool DatabaseWrapperBase::LookupMetadata(std::string& target,
+                                           int64_t id,
+                                           MetadataType type)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT value FROM Metadata WHERE id=? AND type=?");
+    s.BindInt64(0, id);
+    s.BindInt(1, type);
+
+    if (!s.Step())
+    {
+      return false;
+    }
+    else
+    {
+      target = s.ColumnString(0);
+      return true;
+    }
+  }
+
+  void DatabaseWrapperBase::ListAvailableMetadata(std::list<MetadataType>& target,
+                                                  int64_t id)
+  {
+    target.clear();
+
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT type FROM Metadata WHERE id=?");
+    s.BindInt64(0, id);
+
+    while (s.Step())
+    {
+      target.push_back(static_cast<MetadataType>(s.ColumnInt(0)));
+    }
+  }
+
+
+  void DatabaseWrapperBase::AddAttachment(int64_t id,
+                                          const FileInfo& attachment)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO AttachedFiles VALUES(?, ?, ?, ?, ?, ?, ?, ?)");
+    s.BindInt64(0, id);
+    s.BindInt(1, attachment.GetContentType());
+    s.BindString(2, attachment.GetUuid());
+    s.BindInt64(3, attachment.GetCompressedSize());
+    s.BindInt64(4, attachment.GetUncompressedSize());
+    s.BindInt(5, attachment.GetCompressionType());
+    s.BindString(6, attachment.GetUncompressedMD5());
+    s.BindString(7, attachment.GetCompressedMD5());
+    s.Run();
+  }
+
+
+  void DatabaseWrapperBase::DeleteAttachment(int64_t id,
+                                             FileContentType attachment)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM AttachedFiles WHERE id=? AND fileType=?");
+    s.BindInt64(0, id);
+    s.BindInt(1, attachment);
+    s.Run();
+  }
+
+
+
+  void DatabaseWrapperBase::ListAvailableAttachments(std::list<FileContentType>& target,
+                                                     int64_t id)
+  {
+    target.clear();
+
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT fileType FROM AttachedFiles WHERE id=?");
+    s.BindInt64(0, id);
+
+    while (s.Step())
+    {
+      target.push_back(static_cast<FileContentType>(s.ColumnInt(0)));
+    }
+  }
+
+  bool DatabaseWrapperBase::LookupAttachment(FileInfo& attachment,
+                                             int64_t id,
+                                             FileContentType contentType)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT uuid, uncompressedSize, compressionType, compressedSize, uncompressedMD5, compressedMD5 FROM AttachedFiles WHERE id=? AND fileType=?");
+    s.BindInt64(0, id);
+    s.BindInt(1, contentType);
+
+    if (!s.Step())
+    {
+      return false;
+    }
+    else
+    {
+      attachment = FileInfo(s.ColumnString(0),
+                            contentType,
+                            s.ColumnInt64(1),
+                            s.ColumnString(4),
+                            static_cast<CompressionType>(s.ColumnInt(2)),
+                            s.ColumnInt64(3),
+                            s.ColumnString(5));
+      return true;
+    }
+  }
+
+
+  void DatabaseWrapperBase::ClearMainDicomTags(int64_t id)
+  {
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM DicomIdentifiers WHERE id=?");
+      s.BindInt64(0, id);
+      s.Run();
+    }
+
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM MainDicomTags WHERE id=?");
+      s.BindInt64(0, id);
+      s.Run();
+    }
+  }
+
+
+  void DatabaseWrapperBase::SetMainDicomTag(int64_t id,
+                                            const DicomTag& tag,
+                                            const std::string& value)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO MainDicomTags VALUES(?, ?, ?, ?)");
+    s.BindInt64(0, id);
+    s.BindInt(1, tag.GetGroup());
+    s.BindInt(2, tag.GetElement());
+    s.BindString(3, value);
+    s.Run();
+  }
+
+
+  void DatabaseWrapperBase::SetIdentifierTag(int64_t id,
+                                             const DicomTag& tag,
+                                             const std::string& value)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO DicomIdentifiers VALUES(?, ?, ?, ?)");
+    s.BindInt64(0, id);
+    s.BindInt(1, tag.GetGroup());
+    s.BindInt(2, tag.GetElement());
+    s.BindString(3, value);
+    s.Run();
+  }
+
+
+  void DatabaseWrapperBase::GetMainDicomTags(DicomMap& map,
+                                             int64_t id)
+  {
+    map.Clear();
+
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM MainDicomTags WHERE id=?");
+    s.BindInt64(0, id);
+    while (s.Step())
+    {
+      map.SetValue(s.ColumnInt(1),
+                   s.ColumnInt(2),
+                   s.ColumnString(3), false);
+    }
+  }
+
+
+
+  void DatabaseWrapperBase::GetChildrenPublicId(std::list<std::string>& target,
+                                                int64_t id)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT a.publicId FROM Resources AS a, Resources AS b  "
+                        "WHERE a.parentId = b.internalId AND b.internalId = ?");     
+    s.BindInt64(0, id);
+
+    target.clear();
+
+    while (s.Step())
+    {
+      target.push_back(s.ColumnString(0));
+    }
+  }
+
+
+  void DatabaseWrapperBase::GetChildrenInternalId(std::list<int64_t>& target,
+                                                  int64_t id)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT a.internalId FROM Resources AS a, Resources AS b  "
+                        "WHERE a.parentId = b.internalId AND b.internalId = ?");     
+    s.BindInt64(0, id);
+
+    target.clear();
+
+    while (s.Step())
+    {
+      target.push_back(s.ColumnInt64(0));
+    }
+  }
+
+
+  void DatabaseWrapperBase::LogChange(int64_t internalId,
+                                      const ServerIndexChange& change)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO Changes VALUES(NULL, ?, ?, ?, ?)");
+    s.BindInt(0, change.GetChangeType());
+    s.BindInt64(1, internalId);
+    s.BindInt(2, change.GetResourceType());
+    s.BindString(3, change.GetDate());
+    s.Run();
+  }
+
+
+  ErrorCode DatabaseWrapperBase::GetChangesInternal(std::list<ServerIndexChange>& target,
+                                                    bool& done,
+                                                    SQLite::Statement& s,
+                                                    uint32_t maxResults)
+  {
+    target.clear();
+
+    while (target.size() < maxResults && s.Step())
+    {
+      int64_t seq = s.ColumnInt64(0);
+      ChangeType changeType = static_cast<ChangeType>(s.ColumnInt(1));
+      ResourceType resourceType = static_cast<ResourceType>(s.ColumnInt(3));
+      const std::string& date = s.ColumnString(4);
+
+      int64_t internalId = s.ColumnInt64(2);
+      std::string publicId;
+      if (!GetPublicId(publicId, internalId))
+      {
+        return ErrorCode_UnknownResource;
+      }
+
+      target.push_back(ServerIndexChange(seq, changeType, resourceType, publicId, date));
+    }
+
+    done = !(target.size() == maxResults && s.Step());
+    return ErrorCode_Success;
+  }
+
+
+  ErrorCode DatabaseWrapperBase::GetChanges(std::list<ServerIndexChange>& target,
+                                            bool& done,
+                                            int64_t since,
+                                            uint32_t maxResults)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM Changes WHERE seq>? ORDER BY seq LIMIT ?");
+    s.BindInt64(0, since);
+    s.BindInt(1, maxResults + 1);
+    return GetChangesInternal(target, done, s, maxResults);
+  }
+
+  ErrorCode DatabaseWrapperBase::GetLastChange(std::list<ServerIndexChange>& target)
+  {
+    bool done;  // Ignored
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM Changes ORDER BY seq DESC LIMIT 1");
+    return GetChangesInternal(target, done, s, 1);
+  }
+
+
+  void DatabaseWrapperBase::LogExportedResource(const ExportedResource& resource)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "INSERT INTO ExportedResources VALUES(NULL, ?, ?, ?, ?, ?, ?, ?, ?)");
+
+    s.BindInt(0, resource.GetResourceType());
+    s.BindString(1, resource.GetPublicId());
+    s.BindString(2, resource.GetModality());
+    s.BindString(3, resource.GetPatientId());
+    s.BindString(4, resource.GetStudyInstanceUid());
+    s.BindString(5, resource.GetSeriesInstanceUid());
+    s.BindString(6, resource.GetSopInstanceUid());
+    s.BindString(7, resource.GetDate());
+    s.Run();      
+  }
+
+
+  void DatabaseWrapperBase::GetExportedResourcesInternal(std::list<ExportedResource>& target,
+                                                         bool& done,
+                                                         SQLite::Statement& s,
+                                                         uint32_t maxResults)
+  {
+    target.clear();
+
+    while (target.size() < maxResults && s.Step())
+    {
+      int64_t seq = s.ColumnInt64(0);
+      ResourceType resourceType = static_cast<ResourceType>(s.ColumnInt(1));
+      std::string publicId = s.ColumnString(2);
+
+      ExportedResource resource(seq, 
+                                resourceType,
+                                publicId,
+                                s.ColumnString(3),  // modality
+                                s.ColumnString(8),  // date
+                                s.ColumnString(4),  // patient ID
+                                s.ColumnString(5),  // study instance UID
+                                s.ColumnString(6),  // series instance UID
+                                s.ColumnString(7)); // sop instance UID
+
+      target.push_back(resource);
+    }
+
+    done = !(target.size() == maxResults && s.Step());
+  }
+
+
+  void DatabaseWrapperBase::GetExportedResources(std::list<ExportedResource>& target,
+                                                 bool& done,
+                                                 int64_t since,
+                                                 uint32_t maxResults)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT * FROM ExportedResources WHERE seq>? ORDER BY seq LIMIT ?");
+    s.BindInt64(0, since);
+    s.BindInt(1, maxResults + 1);
+    GetExportedResourcesInternal(target, done, s, maxResults);
+  }
+
+    
+  void DatabaseWrapperBase::GetLastExportedResource(std::list<ExportedResource>& target)
+  {
+    bool done;  // Ignored
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT * FROM ExportedResources ORDER BY seq DESC LIMIT 1");
+    GetExportedResourcesInternal(target, done, s, 1);
+  }
+
+
+    
+  uint64_t DatabaseWrapperBase::GetTotalCompressedSize()
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT SUM(compressedSize) FROM AttachedFiles");
+    s.Run();
+    return static_cast<uint64_t>(s.ColumnInt64(0));
+  }
+
+    
+  uint64_t DatabaseWrapperBase::GetTotalUncompressedSize()
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT SUM(uncompressedSize) FROM AttachedFiles");
+    s.Run();
+    return static_cast<uint64_t>(s.ColumnInt64(0));
+  }
+
+  void DatabaseWrapperBase::GetAllInternalIds(std::list<int64_t>& target,
+                                              ResourceType resourceType)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT internalId FROM Resources WHERE resourceType=?");
+    s.BindInt(0, resourceType);
+
+    target.clear();
+    while (s.Step())
+    {
+      target.push_back(s.ColumnInt64(0));
+    }
+  }
+
+
+  void DatabaseWrapperBase::GetAllPublicIds(std::list<std::string>& target,
+                                            ResourceType resourceType)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT publicId FROM Resources WHERE resourceType=?");
+    s.BindInt(0, resourceType);
+
+    target.clear();
+    while (s.Step())
+    {
+      target.push_back(s.ColumnString(0));
+    }
+  }
+
+  void DatabaseWrapperBase::GetAllPublicIds(std::list<std::string>& target,
+                                            ResourceType resourceType,
+                                            size_t since,
+                                            size_t limit)
+  {
+    if (limit == 0)
+    {
+      target.clear();
+      return;
+    }
+
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT publicId FROM Resources WHERE resourceType=? LIMIT ? OFFSET ?");
+    s.BindInt(0, resourceType);
+    s.BindInt64(1, limit);
+    s.BindInt64(2, since);
+
+    target.clear();
+    while (s.Step())
+    {
+      target.push_back(s.ColumnString(0));
+    }
+  }
+
+
+  uint64_t DatabaseWrapperBase::GetResourceCount(ResourceType resourceType)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT COUNT(*) FROM Resources WHERE resourceType=?");
+    s.BindInt(0, resourceType);
+    
+    if (!s.Step())
+    {
+      return 0;
+    }
+    else
+    {
+      int64_t c = s.ColumnInt(0);
+      assert(!s.Step());
+      return c;
+    }
+  }
+
+
+  bool DatabaseWrapperBase::SelectPatientToRecycle(int64_t& internalId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE,
+                        "SELECT patientId FROM PatientRecyclingOrder ORDER BY seq ASC LIMIT 1");
+   
+    if (!s.Step())
+    {
+      // No patient remaining or all the patients are protected
+      return false;
+    }
+    else
+    {
+      internalId = s.ColumnInt(0);
+      return true;
+    }    
+  }
+
+  bool DatabaseWrapperBase::SelectPatientToRecycle(int64_t& internalId,
+                                                   int64_t patientIdToAvoid)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE,
+                        "SELECT patientId FROM PatientRecyclingOrder "
+                        "WHERE patientId != ? ORDER BY seq ASC LIMIT 1");
+    s.BindInt64(0, patientIdToAvoid);
+
+    if (!s.Step())
+    {
+      // No patient remaining or all the patients are protected
+      return false;
+    }
+    else
+    {
+      internalId = s.ColumnInt(0);
+      return true;
+    }   
+  }
+
+  bool DatabaseWrapperBase::IsProtectedPatient(int64_t internalId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE,
+                        "SELECT * FROM PatientRecyclingOrder WHERE patientId = ?");
+    s.BindInt64(0, internalId);
+    return !s.Step();
+  }
+
+  void DatabaseWrapperBase::SetProtectedPatient(int64_t internalId, 
+                                                bool isProtected)
+  {
+    if (isProtected)
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM PatientRecyclingOrder WHERE patientId=?");
+      s.BindInt64(0, internalId);
+      s.Run();
+    }
+    else if (IsProtectedPatient(internalId))
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO PatientRecyclingOrder VALUES(NULL, ?)");
+      s.BindInt64(0, internalId);
+      s.Run();
+    }
+    else
+    {
+      // Nothing to do: The patient is already unprotected
+    }
+  }
+
+
+
+  bool DatabaseWrapperBase::IsExistingResource(int64_t internalId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT * FROM Resources WHERE internalId=?");
+    s.BindInt64(0, internalId);
+    return s.Step();
+  }
+
+
+
+  void DatabaseWrapperBase::LookupIdentifier(std::list<int64_t>& target,
+                                             ResourceType level,
+                                             const DicomTag& tag,
+                                             IdentifierConstraintType type,
+                                             const std::string& value)
+  {
+    static const char* COMMON = ("SELECT d.id FROM DicomIdentifiers AS d, Resources AS r WHERE "
+                                 "d.id = r.internalId AND r.resourceType=? AND "
+                                 "d.tagGroup=? AND d.tagElement=? AND ");
+
+    std::auto_ptr<SQLite::Statement> s;
+
+    switch (type)
+    {
+      case IdentifierConstraintType_GreaterOrEqual:
+        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value>=?"));
+        break;
+
+      case IdentifierConstraintType_SmallerOrEqual:
+        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value<=?"));
+        break;
+
+      case IdentifierConstraintType_Wildcard:
+        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value GLOB ?"));
+        break;
+
+      case IdentifierConstraintType_Equal:
+      default:
+        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value=?"));
+        break;
+    }
+
+    assert(s.get() != NULL);
+
+    s->BindInt(0, level);
+    s->BindInt(1, tag.GetGroup());
+    s->BindInt(2, tag.GetElement());
+    s->BindString(3, value);
+
+    target.clear();
+
+    while (s->Step())
+    {
+      target.push_back(s->ColumnInt64(0));
+    }    
+  }
+
+
+  void DatabaseWrapperBase::LookupIdentifierRange(std::list<int64_t>& target,
+                                                  ResourceType level,
+                                                  const DicomTag& tag,
+                                                  const std::string& start,
+                                                  const std::string& end)
+  {
+    SQLite::Statement statement(db_, SQLITE_FROM_HERE,
+                                "SELECT d.id FROM DicomIdentifiers AS d, Resources AS r WHERE "
+                                "d.id = r.internalId AND r.resourceType=? AND "
+                                "d.tagGroup=? AND d.tagElement=? AND d.value>=? AND d.value<=?");
+
+    statement.BindInt(0, level);
+    statement.BindInt(1, tag.GetGroup());
+    statement.BindInt(2, tag.GetElement());
+    statement.BindString(3, start);
+    statement.BindString(4, end);
+
+    target.clear();
+
+    while (statement.Step())
+    {
+      target.push_back(statement.ColumnInt64(0));
+    }    
+  }
+}