System.Data.SQLite

#if INTEROP_LOG
        if (UnsafeNativeMethods.sqlite3_config_log_interop() == SQLiteErrorCode.Ok)
        {
            UnsafeNativeMethods.sqlite3_log(
                SQLiteErrorCode.Ok, SQLiteConvert.ToUTF8("logging initialized."));
        }
#endif

        SQLiteLog.Initialize();


        string version =
#if NET_40 || NET_45 || NET_451
            "4.0.0.0";
#else
            "3.5.0.0";
#endif

      LogAll = LogPrepare | LogPreBind | LogBind |
               LogCallbackException | LogBackup | LogModuleError |
               LogModuleException,

      /// <summary>
      /// The default extra flags for new connections.
      /// </summary>
      Default = LogCallbackException | LogModuleException,

      /// <summary>
      /// The default extra flags for new connections with all logging enabled.
      /// </summary>
      DefaultAndLogAll = Default | LogAll
  }

  // These are the options to the internal sqlite3_config call.
  internal enum SQLiteConfigOpsEnum
  {
    SQLITE_CONFIG_NONE = 0, // nil
    SQLITE_CONFIG_SINGLETHREAD = 1, // nil

    /// </param>
    public SQLiteConnection(string connectionString, bool parseViaFramework)
    {
#if (SQLITE_STANDARD || USE_INTEROP_DLL || PLATFORM_COMPACTFRAMEWORK) && PRELOAD_NATIVE_LIBRARY
      UnsafeNativeMethods.Initialize();
#endif


      SQLiteLog.Initialize();


#if !PLATFORM_COMPACTFRAMEWORK && !INTEROP_LEGACY_CLOSE && SQLITE_STANDARD
      //
      // NOTE: Check if the sqlite3_close_v2() native API should be available
      //       to use.  This must be done dynamically because the delegate set
      //       here is used by the SQLiteConnectionHandle class, which is a
      //       CriticalHandle derived class (i.e. protected by a constrained

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Member variable to store the application log handler to call.
        /// </summary>
        private static event SQLiteLogEventHandler _handlers;


        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// The default log event handler.
        /// </summary>
        private static SQLiteLogEventHandler _defaultHandler;

        ///////////////////////////////////////////////////////////////////////

#if !INTEROP_LOG
        /// <summary>
        /// The log callback passed to native SQLite engine.  This must live
        /// as long as the SQLite library has a pointer to it.
        /// </summary>
        private static SQLiteLogCallback _callback;

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// The base SQLite object to interop with.
        /// </summary>
        private static SQLiteBase _sql;
#endif

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// This will be non-zero if logging is currently enabled.
        /// </summary>
        private static bool _enabled;

                if (_domainUnload == null)
                {
                    _domainUnload = new EventHandler(DomainUnload);
                    AppDomain.CurrentDomain.DomainUnload += _domainUnload;
                }
#endif

#if !INTEROP_LOG
                //
                // NOTE: Create an instance of the SQLite wrapper class.
                //
                if (_sql == null)
                {
                    _sql = new SQLite3(
                        SQLiteDateFormats.Default, DateTimeKind.Unspecified,

                    SQLiteErrorCode rc = _sql.SetLogCallback(_callback);

                    if (rc != SQLiteErrorCode.Ok)
                        throw new SQLiteException(rc,
                            "Failed to initialize logging.");
                }
#endif

                //
                // NOTE: Logging is enabled by default.
                //
                _enabled = true;

                //

                //
                // NOTE: Disable logging.  If necessary, it can be re-enabled
                //       later by the Initialize method.
                //
                _enabled = false;

#if !INTEROP_LOG
                //
                // BUGBUG: This will cause serious problems if other AppDomains
                //         have any open SQLite connections; however, there is
                //         currently no way around this limitation.
                //
                if (_sql != null)
                {

                //         cannot allow native code to refer to a delegate that
                //         has been garbage collected.
                //
                if (_callback != null)
                {
                    _callback = null;
                }
#endif

                //
                // NOTE: Remove the event handler for the DomainUnload event
                //       that we added earlier.
                //
                if (_domainUnload != null)
                {