changeset 1670:16955f8fec4d db-changes

refactoring: DatabaseWrapperBase
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 01 Oct 2015 14:03:07 +0200
parents a412ad57f0f9
children 2f2e2ec17bc4
files CMakeLists.txt OrthancServer/DatabaseWrapper.cpp OrthancServer/DatabaseWrapper.h OrthancServer/DatabaseWrapperBase.cpp OrthancServer/DatabaseWrapperBase.h
diffstat 5 files changed, 1055 insertions(+), 713 deletions(-) [+]
line wrap: on
line diff
--- a/CMakeLists.txt	Thu Oct 01 11:55:25 2015 +0200
+++ b/CMakeLists.txt	Thu Oct 01 14:03:07 2015 +0200
@@ -172,6 +172,7 @@
   OrthancServer/ServerIndex.cpp
   OrthancServer/ToDcmtkBridge.cpp
   OrthancServer/DatabaseWrapper.cpp
+  OrthancServer/DatabaseWrapperBase.cpp
   OrthancServer/ServerContext.cpp
   OrthancServer/ServerEnumerations.cpp
   OrthancServer/ServerToolbox.cpp
--- a/OrthancServer/DatabaseWrapper.cpp	Thu Oct 01 11:55:25 2015 +0200
+++ b/OrthancServer/DatabaseWrapper.cpp	Thu Oct 01 14:03:07 2015 +0200
@@ -187,130 +187,6 @@
   }
 
 
-  
-  void DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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;
-    }
-  }
-
-  bool DatabaseWrapper::LookupParent(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())
-    {
-      throw OrthancException(ErrorCode_UnknownResource);
-    }
-
-    if (s.ColumnIsNull(0))
-    {
-      return false;
-    }
-    else
-    {
-      parentId = s.ColumnInt(0);
-      return true;
-    }
-  }
-
-  std::string DatabaseWrapper::GetPublicId(int64_t resourceId)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT publicId FROM Resources WHERE internalId=?");
-    s.BindInt64(0, resourceId);
-    
-    if (!s.Step())
-    { 
-      throw OrthancException(ErrorCode_UnknownResource);
-    }
-
-    return s.ColumnString(0);
-  }
-
-
-  ResourceType DatabaseWrapper::GetResourceType(int64_t resourceId)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT resourceType FROM Resources WHERE internalId=?");
-    s.BindInt64(0, resourceId);
-    
-    if (!s.Step())
-    { 
-      throw OrthancException(ErrorCode_UnknownResource);
-    }
-
-    return static_cast<ResourceType>(s.ColumnInt(0));
-  }
-
-
-  void DatabaseWrapper::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 DatabaseWrapper::GetChildren(std::list<std::string>& childrenPublicIds,
                                     int64_t id)
@@ -342,199 +218,6 @@
     }
   }
 
-  void DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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();
-    }
-  }
-
-
-  static void SetMainDicomTagsInternal(SQLite::Statement& s,
-                                       int64_t id,
-                                       const DicomTag& tag,
-                                       const std::string& value)
-  {
-    s.BindInt64(0, id);
-    s.BindInt(1, tag.GetGroup());
-    s.BindInt(2, tag.GetElement());
-    s.BindString(3, value);
-    s.Run();
-  }
-
-
-  void DatabaseWrapper::SetMainDicomTag(int64_t id,
-                                        const DicomTag& tag,
-                                        const std::string& value)
-  {
-    if (tag.IsIdentifier())
-    {
-      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO DicomIdentifiers VALUES(?, ?, ?, ?)");
-      SetMainDicomTagsInternal(s, id, tag, value);
-    }
-    else
-    {
-      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO MainDicomTags VALUES(?, ?, ?, ?)");
-      SetMainDicomTagsInternal(s, id, tag, value);
-    }
-  }
-
-  void DatabaseWrapper::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));
-    }
-
-    SQLite::Statement s2(db_, SQLITE_FROM_HERE, "SELECT * FROM DicomIdentifiers WHERE id=?");
-    s2.BindInt64(0, id);
-    while (s2.Step())
-    {
-      map.SetValue(s2.ColumnInt(1),
-                   s2.ColumnInt(2),
-                   s2.ColumnString(3));
-    }
-  }
-
 
   bool DatabaseWrapper::GetParentPublicId(std::string& target,
                                           int64_t id)
@@ -555,164 +238,6 @@
   }
 
 
-  void DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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();
-  }
-
-
-  void DatabaseWrapper::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 = GetPublicId(internalId);
-
-      target.push_back(ServerIndexChange(seq, changeType, resourceType, publicId, date));
-    }
-
-    done = !(target.size() == maxResults && s.Step());
-  }
-
-
-  void DatabaseWrapper::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);
-    GetChangesInternal(target, done, s, maxResults);
-  }
-
-  void DatabaseWrapper::GetLastChange(std::list<ServerIndexChange>& target)
-  {
-    bool done;  // Ignored
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM Changes ORDER BY seq DESC LIMIT 1");
-    GetChangesInternal(target, done, s, 1);
-  }
-
-
-  void DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::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);
-  }
-
-
-    
-
   int64_t DatabaseWrapper::GetTableRecordCount(const std::string& table)
   {
     char buf[128];
@@ -731,65 +256,13 @@
   }
 
     
-  uint64_t DatabaseWrapper::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 DatabaseWrapper::GetTotalUncompressedSize()
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT SUM(uncompressedSize) FROM AttachedFiles");
-    s.Run();
-    return static_cast<uint64_t>(s.ColumnInt64(0));
-  }
-
-  void DatabaseWrapper::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 DatabaseWrapper::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));
-    }
-  }
-
-
-  DatabaseWrapper::DatabaseWrapper(const std::string& path) : listener_(NULL)
+  DatabaseWrapper::DatabaseWrapper(const std::string& path) : listener_(NULL), base_(db_)
   {
     db_.Open(path);
     Open();
   }
 
-  DatabaseWrapper::DatabaseWrapper() : listener_(NULL)
+  DatabaseWrapper::DatabaseWrapper() : listener_(NULL), base_(db_)
   {
     db_.OpenInMemory();
     Open();
@@ -906,90 +379,6 @@
     db_.Register(new Internals::SignalResourceDeleted(listener));
   }
 
-  uint64_t DatabaseWrapper::GetResourceCount(ResourceType resourceType)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT COUNT(*) FROM Resources WHERE resourceType=?");
-    s.BindInt(0, resourceType);
-    
-    if (!s.Step())
-    {
-      throw OrthancException(ErrorCode_InternalError);
-    }
-
-    int64_t c = s.ColumnInt(0);
-    assert(!s.Step());
-
-    return c;
-  }
-
-  bool DatabaseWrapper::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 DatabaseWrapper::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 DatabaseWrapper::IsProtectedPatient(int64_t internalId)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE,
-                        "SELECT * FROM PatientRecyclingOrder WHERE patientId = ?");
-    s.BindInt64(0, internalId);
-    return !s.Step();
-  }
-
-  void DatabaseWrapper::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
-    }
-  }
-
-
 
   void DatabaseWrapper::ClearTable(const std::string& tableName)
   {
@@ -997,57 +386,6 @@
   }
 
 
-  bool DatabaseWrapper::IsExistingResource(int64_t internalId)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT * FROM Resources WHERE internalId=?");
-    s.BindInt64(0, internalId);
-    return s.Step();
-  }
-
-
-  void  DatabaseWrapper::LookupIdentifier(std::list<int64_t>& target,
-                                          const DicomTag& tag,
-                                          const std::string& value)
-  {
-    if (!tag.IsIdentifier())
-    {
-      throw OrthancException(ErrorCode_ParameterOutOfRange);
-    }
-
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT id FROM DicomIdentifiers WHERE tagGroup=? AND tagElement=? and value=?");
-
-    s.BindInt(0, tag.GetGroup());
-    s.BindInt(1, tag.GetElement());
-    s.BindString(2, value);
-
-    target.clear();
-
-    while (s.Step())
-    {
-      target.push_back(s.ColumnInt64(0));
-    }
-  }
-
-
-  void  DatabaseWrapper::LookupIdentifier(std::list<int64_t>& target,
-                                          const std::string& value)
-  {
-    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
-                        "SELECT id FROM DicomIdentifiers WHERE value=?");
-
-    s.BindString(0, value);
-
-    target.clear();
-
-    while (s.Step())
-    {
-      target.push_back(s.ColumnInt64(0));
-    }
-  }
-
-
   void DatabaseWrapper::GetAllMetadata(std::map<MetadataType, std::string>& target,
                                        int64_t id)
   {
--- a/OrthancServer/DatabaseWrapper.h	Thu Oct 01 11:55:25 2015 +0200
+++ b/OrthancServer/DatabaseWrapper.h	Thu Oct 01 14:03:07 2015 +0200
@@ -36,6 +36,7 @@
 
 #include "../Core/SQLite/Connection.h"
 #include "../Core/SQLite/Transaction.h"
+#include "DatabaseWrapperBase.h"
 
 namespace Orthanc
 {
@@ -54,21 +55,12 @@
   private:
     IDatabaseListener* listener_;
     SQLite::Connection db_;
+    DatabaseWrapperBase base_;
     Internals::SignalRemainingAncestor* signalRemainingAncestor_;
     unsigned int version_;
 
     void Open();
 
-    void GetChangesInternal(std::list<ServerIndexChange>& target,
-                            bool& done,
-                            SQLite::Statement& s,
-                            uint32_t maxResults);
-
-    void GetExportedResourcesInternal(std::list<ExportedResource>& target,
-                                      bool& done,
-                                      SQLite::Statement& s,
-                                      uint32_t maxResults);
-
     void ClearTable(const std::string& tableName);
 
   public:
@@ -79,114 +71,222 @@
     virtual void SetListener(IDatabaseListener& listener);
 
     virtual void SetGlobalProperty(GlobalProperty property,
-                                   const std::string& value);
+                                   const std::string& value)
+    {
+      base_.SetGlobalProperty(property, value);
+    }
 
     virtual bool LookupGlobalProperty(std::string& target,
-                                      GlobalProperty property);
+                                      GlobalProperty property)
+    {
+      return base_.LookupGlobalProperty(target, property);
+    }
 
     virtual int64_t CreateResource(const std::string& publicId,
-                                   ResourceType type);
+                                   ResourceType type)
+    {
+      return base_.CreateResource(publicId, type);
+    }
 
     virtual bool LookupResource(int64_t& id,
                                 ResourceType& type,
-                                const std::string& publicId);
+                                const std::string& publicId)
+    {
+      return base_.LookupResource(id, type, publicId);
+    }
 
     virtual bool LookupParent(int64_t& parentId,
-                              int64_t resourceId);
+                              int64_t resourceId)
+    {
+      return base_.LookupParent(parentId, resourceId);
+    }
 
-    virtual std::string GetPublicId(int64_t resourceId);
+    virtual std::string GetPublicId(int64_t resourceId)
+    {
+      return base_.GetPublicId(resourceId);
+    }
 
-    virtual ResourceType GetResourceType(int64_t resourceId);
+    virtual ResourceType GetResourceType(int64_t resourceId)
+    {
+      return base_.GetResourceType(resourceId);
+    }
 
     virtual void AttachChild(int64_t parent,
-                             int64_t child);
+                             int64_t child)
+    {
+      base_.AttachChild(parent, child);
+    }
 
     virtual void DeleteResource(int64_t id);
 
     virtual void SetMetadata(int64_t id,
                              MetadataType type,
-                             const std::string& value);
+                             const std::string& value)
+    {
+      base_.SetMetadata(id, type, value);
+    }
 
     virtual void DeleteMetadata(int64_t id,
-                                MetadataType type);
+                                MetadataType type)
+    {
+      base_.DeleteMetadata(id, type);
+    }
 
     virtual bool LookupMetadata(std::string& target,
                                 int64_t id,
-                                MetadataType type);
+                                MetadataType type)
+    {
+      return base_.LookupMetadata(target, id, type);
+    }
 
     virtual void ListAvailableMetadata(std::list<MetadataType>& target,
-                                       int64_t id);
+                                       int64_t id)
+    {
+      base_.ListAvailableMetadata(target, id);
+    }
 
     virtual void AddAttachment(int64_t id,
-                               const FileInfo& attachment);
+                               const FileInfo& attachment)
+    {
+      base_.AddAttachment(id, attachment);
+    }
 
     virtual void DeleteAttachment(int64_t id,
-                                  FileContentType attachment);
+                                  FileContentType attachment)
+    {
+      base_.DeleteAttachment(id, attachment);
+    }
 
     virtual void ListAvailableAttachments(std::list<FileContentType>& target,
-                                          int64_t id);
+                                          int64_t id)
+    {
+      return base_.ListAvailableAttachments(target, id);
+    }
 
     virtual bool LookupAttachment(FileInfo& attachment,
                                   int64_t id,
-                                  FileContentType contentType);
+                                  FileContentType contentType)
+    {
+      return base_.LookupAttachment(attachment, id, contentType);
+    }
 
-    virtual void ClearMainDicomTags(int64_t id);
+    virtual void ClearMainDicomTags(int64_t id)
+    {
+      base_.ClearMainDicomTags(id);
+    }
 
     virtual void SetMainDicomTag(int64_t id,
                                  const DicomTag& tag,
-                                 const std::string& value);
+                                 const std::string& value)
+    {
+      base_.SetMainDicomTag(id, tag, value);
+    }
 
     virtual void GetMainDicomTags(DicomMap& map,
-                                  int64_t id);
+                                  int64_t id)
+    {
+      base_.GetMainDicomTags(map, id);
+    }
 
     virtual void GetChildrenPublicId(std::list<std::string>& target,
-                                     int64_t id);
+                                     int64_t id)
+    {
+      base_.GetChildrenPublicId(target, id);
+    }
 
     virtual void GetChildrenInternalId(std::list<int64_t>& target,
-                                       int64_t id);
+                                       int64_t id)
+    {
+      base_.GetChildrenInternalId(target, id);
+    }
 
     virtual void LogChange(int64_t internalId,
-                           const ServerIndexChange& change);
+                           const ServerIndexChange& change)
+    {
+      base_.LogChange(internalId, change);
+    }
 
     virtual void GetChanges(std::list<ServerIndexChange>& target /*out*/,
                             bool& done /*out*/,
                             int64_t since,
-                            uint32_t maxResults);
+                            uint32_t maxResults)
+    {
+      base_.GetChanges(target, done, since, maxResults);
+    }
 
-    virtual void GetLastChange(std::list<ServerIndexChange>& target /*out*/);
+    virtual void GetLastChange(std::list<ServerIndexChange>& target /*out*/)
+    {
+      base_.GetLastChange(target);
+    }
 
-    virtual void LogExportedResource(const ExportedResource& resource);
+    virtual void LogExportedResource(const ExportedResource& resource)
+    {
+      base_.LogExportedResource(resource);
+    }
     
     virtual void GetExportedResources(std::list<ExportedResource>& target /*out*/,
                                       bool& done /*out*/,
                                       int64_t since,
-                                      uint32_t maxResults);
+                                      uint32_t maxResults)
+    {
+      base_.GetExportedResources(target, done, since, maxResults);
+    }
 
-    virtual void GetLastExportedResource(std::list<ExportedResource>& target /*out*/);
+    virtual void GetLastExportedResource(std::list<ExportedResource>& target /*out*/)
+    {
+      base_.GetLastExportedResource(target);
+    }
 
-    virtual uint64_t GetTotalCompressedSize();
+    virtual uint64_t GetTotalCompressedSize()
+    {
+      return base_.GetTotalCompressedSize();
+    }
     
-    virtual uint64_t GetTotalUncompressedSize();
+    virtual uint64_t GetTotalUncompressedSize()
+    {
+      return base_.GetTotalUncompressedSize();
+    }
 
-    virtual uint64_t GetResourceCount(ResourceType resourceType);
+    virtual uint64_t GetResourceCount(ResourceType resourceType)
+    {
+      return base_.GetResourceCount(resourceType);
+    }
 
     virtual void GetAllPublicIds(std::list<std::string>& target,
-                                 ResourceType resourceType);
+                                 ResourceType resourceType)
+    {
+      base_.GetAllPublicIds(target, resourceType);
+    }
 
     virtual void GetAllPublicIds(std::list<std::string>& target,
                                  ResourceType resourceType,
                                  size_t since,
-                                 size_t limit);
+                                 size_t limit)
+    {
+      base_.GetAllPublicIds(target, resourceType, since, limit);
+    }
 
-    virtual bool SelectPatientToRecycle(int64_t& internalId);
+    virtual bool SelectPatientToRecycle(int64_t& internalId)
+    {
+      return base_.SelectPatientToRecycle(internalId);
+    }
 
     virtual bool SelectPatientToRecycle(int64_t& internalId,
-                                        int64_t patientIdToAvoid);
+                                        int64_t patientIdToAvoid)
+    {
+      return base_.SelectPatientToRecycle(internalId, patientIdToAvoid);
+    }
 
-    virtual bool IsProtectedPatient(int64_t internalId);
+    virtual bool IsProtectedPatient(int64_t internalId)
+    {
+      return base_.IsProtectedPatient(internalId);
+    }
 
     virtual void SetProtectedPatient(int64_t internalId, 
-                                     bool isProtected);
+                                     bool isProtected)
+    {
+      base_.SetProtectedPatient(internalId, isProtected);
+    }
 
     virtual SQLite::ITransaction* StartTransaction()
     {
@@ -213,14 +313,23 @@
       ClearTable("ExportedResources");
     }
 
-    virtual bool IsExistingResource(int64_t internalId);
+    virtual bool IsExistingResource(int64_t internalId)
+    {
+      return base_.IsExistingResource(internalId);
+    }
 
     virtual void LookupIdentifier(std::list<int64_t>& target,
                                   const DicomTag& tag,
-                                  const std::string& value);
+                                  const std::string& value)
+    {
+      base_.LookupIdentifier(target, tag, value);
+    }
 
     virtual void LookupIdentifier(std::list<int64_t>& target,
-                                  const std::string& value);
+                                  const std::string& value)
+    {
+      base_.LookupIdentifier(target, value);
+    }
 
     virtual void GetAllMetadata(std::map<MetadataType, std::string>& target,
                                 int64_t id);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancServer/DatabaseWrapperBase.cpp	Thu Oct 01 14:03:07 2015 +0200
@@ -0,0 +1,703 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, 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>
+
+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;
+    }
+  }
+
+  bool DatabaseWrapperBase::LookupParent(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())
+    {
+      throw OrthancException(ErrorCode_UnknownResource);
+    }
+
+    if (s.ColumnIsNull(0))
+    {
+      return false;
+    }
+    else
+    {
+      parentId = s.ColumnInt(0);
+      return true;
+    }
+  }
+
+  std::string DatabaseWrapperBase::GetPublicId(int64_t resourceId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT publicId FROM Resources WHERE internalId=?");
+    s.BindInt64(0, resourceId);
+    
+    if (!s.Step())
+    { 
+      throw OrthancException(ErrorCode_UnknownResource);
+    }
+
+    return s.ColumnString(0);
+  }
+
+
+  ResourceType DatabaseWrapperBase::GetResourceType(int64_t resourceId)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT resourceType FROM Resources WHERE internalId=?");
+    s.BindInt64(0, resourceId);
+    
+    if (!s.Step())
+    { 
+      throw OrthancException(ErrorCode_UnknownResource);
+    }
+
+    return static_cast<ResourceType>(s.ColumnInt(0));
+  }
+
+
+  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();
+    }
+  }
+
+
+  static void SetMainDicomTagsInternal(SQLite::Statement& s,
+                                       int64_t id,
+                                       const DicomTag& tag,
+                                       const std::string& value)
+  {
+    s.BindInt64(0, id);
+    s.BindInt(1, tag.GetGroup());
+    s.BindInt(2, tag.GetElement());
+    s.BindString(3, value);
+    s.Run();
+  }
+
+
+  void DatabaseWrapperBase::SetMainDicomTag(int64_t id,
+                                            const DicomTag& tag,
+                                            const std::string& value)
+  {
+    if (tag.IsIdentifier())
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO DicomIdentifiers VALUES(?, ?, ?, ?)");
+      SetMainDicomTagsInternal(s, id, tag, value);
+    }
+    else
+    {
+      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO MainDicomTags VALUES(?, ?, ?, ?)");
+      SetMainDicomTagsInternal(s, id, tag, value);
+    }
+  }
+
+  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));
+    }
+
+    SQLite::Statement s2(db_, SQLITE_FROM_HERE, "SELECT * FROM DicomIdentifiers WHERE id=?");
+    s2.BindInt64(0, id);
+    while (s2.Step())
+    {
+      map.SetValue(s2.ColumnInt(1),
+                   s2.ColumnInt(2),
+                   s2.ColumnString(3));
+    }
+  }
+
+
+
+  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();
+  }
+
+
+  void 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 = GetPublicId(internalId);
+
+      target.push_back(ServerIndexChange(seq, changeType, resourceType, publicId, date));
+    }
+
+    done = !(target.size() == maxResults && s.Step());
+  }
+
+
+  void 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);
+    GetChangesInternal(target, done, s, maxResults);
+  }
+
+  void 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");
+    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::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())
+    {
+      throw OrthancException(ErrorCode_InternalError);
+    }
+
+    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,
+                                             const DicomTag& tag,
+                                             const std::string& value)
+  {
+    if (!tag.IsIdentifier())
+    {
+      throw OrthancException(ErrorCode_ParameterOutOfRange);
+    }
+
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT id FROM DicomIdentifiers WHERE tagGroup=? AND tagElement=? and value=?");
+
+    s.BindInt(0, tag.GetGroup());
+    s.BindInt(1, tag.GetElement());
+    s.BindString(2, value);
+
+    target.clear();
+
+    while (s.Step())
+    {
+      target.push_back(s.ColumnInt64(0));
+    }
+  }
+
+
+  void DatabaseWrapperBase::LookupIdentifier(std::list<int64_t>& target,
+                                             const std::string& value)
+  {
+    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
+                        "SELECT id FROM DicomIdentifiers WHERE value=?");
+
+    s.BindString(0, value);
+
+    target.clear();
+
+    while (s.Step())
+    {
+      target.push_back(s.ColumnInt64(0));
+    }
+  }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancServer/DatabaseWrapperBase.h	Thu Oct 01 14:03:07 2015 +0200
@@ -0,0 +1,191 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, 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/>.
+ **/
+
+
+#pragma once
+
+#include "../Core/DicomFormat/DicomMap.h"
+#include "../Core/DicomFormat/DicomTag.h"
+#include "../Core/Enumerations.h"
+#include "../Core/FileStorage/FileInfo.h"
+#include "../Core/SQLite/Connection.h"
+#include "../OrthancServer/ServerIndexChange.h"
+#include "../OrthancServer/ExportedResource.h"
+#include "ServerEnumerations.h"
+
+#include <list>
+
+
+namespace Orthanc
+{
+  class DatabaseWrapperBase
+  {
+  private:
+    SQLite::Connection&  db_;
+
+    void GetChangesInternal(std::list<ServerIndexChange>& target,
+                            bool& done,
+                            SQLite::Statement& s,
+                            uint32_t maxResults);
+
+    void GetExportedResourcesInternal(std::list<ExportedResource>& target,
+                                      bool& done,
+                                      SQLite::Statement& s,
+                                      uint32_t maxResults);
+
+  public:
+    DatabaseWrapperBase(SQLite::Connection& db) : db_(db)
+    {
+    }
+
+    void SetGlobalProperty(GlobalProperty property,
+                           const std::string& value);
+
+    bool LookupGlobalProperty(std::string& target,
+                              GlobalProperty property);
+
+    int64_t CreateResource(const std::string& publicId,
+                           ResourceType type);
+
+    bool LookupResource(int64_t& id,
+                        ResourceType& type,
+                        const std::string& publicId);
+
+    bool LookupParent(int64_t& parentId,
+                      int64_t resourceId);
+
+    std::string GetPublicId(int64_t resourceId);
+
+    ResourceType GetResourceType(int64_t resourceId);
+
+    void AttachChild(int64_t parent,
+                     int64_t child);
+
+    void SetMetadata(int64_t id,
+                     MetadataType type,
+                     const std::string& value);
+
+    void DeleteMetadata(int64_t id,
+                        MetadataType type);
+
+    bool LookupMetadata(std::string& target,
+                        int64_t id,
+                        MetadataType type);
+
+    void ListAvailableMetadata(std::list<MetadataType>& target,
+                               int64_t id);
+
+    void AddAttachment(int64_t id,
+                       const FileInfo& attachment);
+
+    void DeleteAttachment(int64_t id,
+                          FileContentType attachment);
+
+    void ListAvailableAttachments(std::list<FileContentType>& target,
+                                  int64_t id);
+
+    bool LookupAttachment(FileInfo& attachment,
+                          int64_t id,
+                          FileContentType contentType);
+
+
+    void ClearMainDicomTags(int64_t id);
+
+
+    void SetMainDicomTag(int64_t id,
+                         const DicomTag& tag,
+                         const std::string& value);
+
+    void GetMainDicomTags(DicomMap& map,
+                          int64_t id);
+
+    void GetChildrenPublicId(std::list<std::string>& target,
+                             int64_t id);
+
+    void GetChildrenInternalId(std::list<int64_t>& target,
+                               int64_t id);
+
+    void LogChange(int64_t internalId,
+                   const ServerIndexChange& change);
+
+    void GetChanges(std::list<ServerIndexChange>& target,
+                    bool& done,
+                    int64_t since,
+                    uint32_t maxResults);
+
+    void GetLastChange(std::list<ServerIndexChange>& target);
+
+
+    void LogExportedResource(const ExportedResource& resource);
+
+    void GetExportedResources(std::list<ExportedResource>& target,
+                              bool& done,
+                              int64_t since,
+                              uint32_t maxResults);
+    
+    void GetLastExportedResource(std::list<ExportedResource>& target);
+    
+    uint64_t GetTotalCompressedSize();
+    
+    uint64_t GetTotalUncompressedSize();
+
+    void GetAllPublicIds(std::list<std::string>& target,
+                         ResourceType resourceType);
+
+    void GetAllPublicIds(std::list<std::string>& target,
+                         ResourceType resourceType,
+                         size_t since,
+                         size_t limit);
+
+    uint64_t GetResourceCount(ResourceType resourceType);
+
+    bool SelectPatientToRecycle(int64_t& internalId);
+
+    bool SelectPatientToRecycle(int64_t& internalId,
+                                int64_t patientIdToAvoid);
+
+    bool IsProtectedPatient(int64_t internalId);
+
+    void SetProtectedPatient(int64_t internalId, 
+                             bool isProtected);
+
+    bool IsExistingResource(int64_t internalId);
+
+
+    void LookupIdentifier(std::list<int64_t>& target,
+                          const DicomTag& tag,
+                          const std::string& value);
+
+    void LookupIdentifier(std::list<int64_t>& target,
+                          const std::string& value);
+  };
+}
+