--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Common/DatabaseManager.h	Wed Jul 04 08:16:29 2018 +0200
@@ -0,0 +1,128 @@
+/**
+ * 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 Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "IDatabaseFactory.h"
+#include "StatementLocation.h"
+
+#include <Core/Enumerations.h>
+
+#include <boost/thread/recursive_mutex.hpp>
+#include <memory>
+
+namespace OrthancDatabases
+{
+  class DatabaseManager : public boost::noncopyable
+  {
+  private:
+    typedef std::map<StatementLocation, IPrecompiledStatement*>  CachedStatements;
+
+    boost::recursive_mutex           mutex_;
+    std::auto_ptr<IDatabaseFactory>  factory_;
+    std::auto_ptr<IDatabase>         database_;
+    std::auto_ptr<ITransaction>      transaction_;
+    CachedStatements                 cachedStatements_;
+    Dialect                          dialect_;
+
+    IDatabase& GetDatabase();
+
+    void CloseIfUnavailable(Orthanc::ErrorCode e);
+
+    IPrecompiledStatement* LookupCachedStatement(const StatementLocation& location) const;
+
+    IPrecompiledStatement& CacheStatement(const StatementLocation& location,
+                                          const Query& query);
+
+    ITransaction& GetTransaction();
+    
+  public:
+    DatabaseManager(IDatabaseFactory* factory);  // Takes ownership
+    
+    ~DatabaseManager()
+    {
+      Close();
+    }
+
+    Dialect GetDialect() const
+    {
+      return dialect_;
+    }
+
+    void Open()
+    {
+      GetDatabase();
+    }
+
+    void Close();
+    
+    void StartTransaction();
+
+    void CommitTransaction();
+    
+    void RollbackTransaction();
+
+    class CachedStatement : public boost::noncopyable
+    {
+    private:
+      boost::recursive_mutex::scoped_lock  lock_;
+      DatabaseManager&                     manager_;
+      StatementLocation                    location_;
+      IDatabase&                           database_;
+      ITransaction&                        transaction_;
+      IPrecompiledStatement*               statement_;
+      std::auto_ptr<Query>                 query_;
+      std::auto_ptr<IResult>               result_;
+
+      IResult& GetResult() const;
+
+    public:
+      CachedStatement(const StatementLocation& location,
+                      DatabaseManager& manager,
+                      const char* sql);
+
+      void SetReadOnly(bool readOnly);
+
+      void SetParameterType(const std::string& parameter,
+                            ValueType type);
+      
+      void Execute();
+
+      void Execute(const Dictionary& parameters);
+
+      IDatabase& GetDatabase()
+      {
+        return database_;
+      }
+      
+      bool IsDone() const;
+      
+      void Next();
+
+      size_t GetResultFieldsCount() const;
+
+      void SetResultFieldType(size_t field,
+                              ValueType type);
+      
+      const IValue& GetResultField(size_t index) const;
+    };
+  };
+}