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SessionImpl.h

//
// SessionImpl.h
//
// $Id: //poco/1.4/Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h#1 $
//
// Library: Data/SQLite
// Package: SQLite
// Module:  SessionImpl
//
// Definition of the SessionImpl class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef DataConnectors_SQLite_SessionImpl_INCLUDED
#define DataConnectors_SQLite_SessionImpl_INCLUDED


#include "Poco/Data/SQLite/SQLite.h"
#include "Poco/Data/SQLite/Binder.h"
#include "Poco/Data/AbstractSessionImpl.h"
#include "Poco/SharedPtr.h"


struct sqlite3;
struct sqlite3_stmt;


namespace Poco {
namespace Data {
namespace SQLite {


00058 class SQLite_API SessionImpl: public Poco::Data::AbstractSessionImpl<SessionImpl>
      /// Implements SessionImpl interface.
      ///
      /// The following properties are supported:
      ///   * transactionMode: "DEFERRED", "IMMEDIATE" or "EXCLUSIVE"
      ///   * maxRetryAttempts: maximum number of attemptes to retry an operation if
      ///     database is locked or busy. Between retry attempts, sleep for a random
      ///     time. 
      ///   * minRetrySleep: the minimum time (in milliseconds) waited between two retry attempts.
      ///   * maxRetrySleep: the maximum time (in milliseconds) waited between two retry attempts.
      ///
      /// Notes: For automatic retries to work, you should start every transaction that
      /// at one point will write to the database with IMMEDIATE or EXCLUSIVE mode.
{
public:
      enum
      {
            DEFAULT_MAX_RETRY_ATTEMPTS = 0, /// Default maximum number of attempts to retry an operation if the database is locked.
00076             DEFAULT_MIN_RETRY_SLEEP    = 2, /// Default minimum sleep interval (milliseconds) between retry attempts.
00077             DEFAULT_MAX_RETRY_SLEEP    = 20 /// Default maximum sleep interval (milliseconds) between retry attempts.
      };
      
      SessionImpl(const std::string& fileName);
            /// Creates the SessionImpl. Opens a connection to the database.

      ~SessionImpl();
            /// Destroys the SessionImpl.

      Poco::Data::StatementImpl* createStatementImpl();
            /// Returns an SQLite StatementImpl.

      void begin();
            /// Starts a transaction.

      void commit();
            /// Commits and ends a transaction.

      void rollback();
            /// Aborts a transaction.

      void close();
            /// Closes the session.
            
      bool isTransaction();
            /// Returns true iff a transaction is in progress.

      bool isConnected();
            /// Returns true iff connected, false otherwise.
            
      sqlite3* db();
            /// Returns a pointer to the underlying sqlite3 structure.
            ///
            /// This can be called to invoke sqlite API functions 
            /// directly on the underlying database.
            
protected:
      void setTransactionMode(const std::string& prop, const Poco::Any& value);
      Poco::Any getTransactionMode(const std::string& prop);
      void setMaxRetryAttempts(const std::string& prop, const Poco::Any& value);
      Poco::Any getMaxRetryAttempts(const std::string& prop);
      void setMinRetrySleep(const std::string& prop, const Poco::Any& value);
      Poco::Any getMinRetrySleep(const std::string& prop);
      void setMaxRetrySleep(const std::string& prop, const Poco::Any& value);
      Poco::Any getMaxRetrySleep(const std::string& prop);
      
private:
      void open();
            /// Opens a connection to the Database.

00127       std::string _dbFileName;
      sqlite3*    _pDB;
      std::string _transactionMode;
      int         _maxRetryAttempts;
      int         _minRetrySleep;
      int         _maxRetrySleep;
      bool        _connected;
      
      static const std::string BEGIN_TRANSACTION;
      static const std::string COMMIT_TRANSACTION;
      static const std::string ABORT_TRANSACTION;
};


//
// inlines
//
00144 inline sqlite3* SessionImpl::db()
{
      return _pDB;
}


} } } // namespace Poco::Data::SQLite


#endif // DataConnectors_SQLite_SessionImpl_INCLUDED

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