/// <summary>
    /// Calls the native SQLite core library in order to create a disposable
    /// module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object to be used when creating the native disposable module.
    /// </param>



    internal override void CreateModule(SQLiteModule module)
    {
        if (module == null)
            throw new ArgumentNullException("module");







        if (_sql == null)
            throw new SQLiteException("connection has an invalid handle");

        SetLoadExtension(true);
        LoadExtension(UnsafeNativeMethods.SQLITE_DLL, "sqlite3_vtshim_init");

................................................................................
    /// Calls the native SQLite core library in order to cleanup the resources
    /// associated with a module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object previously passed to the <see cref="CreateModule" />
    /// method.
    /// </param>



    internal override void DisposeModule(SQLiteModule module)
    {
        if (module == null)
            throw new ArgumentNullException("module");

        module.Dispose();
    }
#endif

    /// <summary>
    /// Calls the native SQLite core library in order to create a disposable
    /// module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object to be used when creating the native disposable module.
    /// </param>
    /// <param name="flags">
    /// The flags for the associated <see cref="SQLiteConnection" /> object instance.
    /// </param>
    internal override void CreateModule(SQLiteModule module, SQLiteConnectionFlags flags)
    {
        if (module == null)
            throw new ArgumentNullException("module");

        if ((flags & SQLiteConnectionFlags.NoLogModule) != SQLiteConnectionFlags.NoLogModule)
        {
            module.LogErrors = ((flags & SQLiteConnectionFlags.LogModuleError) == SQLiteConnectionFlags.LogModuleError);
            module.LogExceptions = ((flags & SQLiteConnectionFlags.LogModuleException) == SQLiteConnectionFlags.LogModuleException);
        }

        if (_sql == null)
            throw new SQLiteException("connection has an invalid handle");

        SetLoadExtension(true);
        LoadExtension(UnsafeNativeMethods.SQLITE_DLL, "sqlite3_vtshim_init");

................................................................................
    /// Calls the native SQLite core library in order to cleanup the resources
    /// associated with a module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object previously passed to the <see cref="CreateModule" />
    /// method.
    /// </param>
    /// <param name="flags">
    /// The flags for the associated <see cref="SQLiteConnection" /> object instance.
    /// </param>
    internal override void DisposeModule(SQLiteModule module, SQLiteConnectionFlags flags)
    {
        if (module == null)
            throw new ArgumentNullException("module");

        module.Dispose();
    }
#endif

    /// <summary>
    /// Calls the native SQLite core library in order to create a disposable
    /// module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object to be used when creating the native disposable module.
    /// </param>



    internal abstract void CreateModule(SQLiteModule module);

    /// <summary>
    /// Calls the native SQLite core library in order to cleanup the resources
    /// associated with a module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object previously passed to the <see cref="CreateModule" />
    /// method.
    /// </param>



    internal abstract void DisposeModule(SQLiteModule module);

    /// <summary>
    /// Calls the native SQLite core library in order to declare a virtual table
    /// in response to a call into the <see cref="ISQLiteNativeModule.xCreate" />
    /// or <see cref="ISQLiteNativeModule.xConnect" /> virtual table methods.
    /// </summary>
    /// <param name="module">
................................................................................

      /// <summary>
      /// Skip adding the any functions provided by other managed assemblies
      /// when opening the connection.
      /// </summary>
      NoFunctions = 0x800,




















      /// <summary>
      /// When binding and returning column values, always treat them as though
      /// they were plain text (i.e. no numeric, date/time, or other conversions
      /// should be attempted).
      /// </summary>
      BindAndGetAllAsText = BindAllAsText | GetAllAsText,

      /// <summary>
      /// Enable all logging.
      /// </summary>
      LogAll = LogPrepare | LogPreBind | LogBind |
               LogCallbackException | LogBackup,


      /// <summary>
      /// The default extra flags for new connections.
      /// </summary>
      Default = LogCallbackException
  }

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

    /// <summary>
    /// Calls the native SQLite core library in order to create a disposable
    /// module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object to be used when creating the native disposable module.
    /// </param>
    /// <param name="flags">
    /// The flags for the associated <see cref="SQLiteConnection" /> object instance.
    /// </param>
    internal abstract void CreateModule(SQLiteModule module, SQLiteConnectionFlags flags);

    /// <summary>
    /// Calls the native SQLite core library in order to cleanup the resources
    /// associated with a module containing the implementation of a virtual table.
    /// </summary>
    /// <param name="module">
    /// The module object previously passed to the <see cref="CreateModule" />
    /// method.
    /// </param>
    /// <param name="flags">
    /// The flags for the associated <see cref="SQLiteConnection" /> object instance.
    /// </param>
    internal abstract void DisposeModule(SQLiteModule module, SQLiteConnectionFlags flags);

    /// <summary>
    /// Calls the native SQLite core library in order to declare a virtual table
    /// in response to a call into the <see cref="ISQLiteNativeModule.xCreate" />
    /// or <see cref="ISQLiteNativeModule.xConnect" /> virtual table methods.
    /// </summary>
    /// <param name="module">
................................................................................

      /// <summary>
      /// Skip adding the any functions provided by other managed assemblies
      /// when opening the connection.
      /// </summary>
      NoFunctions = 0x800,

      /// <summary>
      /// Skip setting the logging related properties of the
      /// <see cref="SQLiteModule" /> object instance that was passed to
      /// the <see cref="SQLiteConnection.CreateModule" /> method.
      /// </summary>
      NoLogModule = 0x1000,

      /// <summary>
      /// Enable logging of all virtual table module errors seen by the
      /// <see cref="SQLiteModule.SetTableError(IntPtr,String)" /> method.
      /// </summary>
      LogModuleError = 0x2000,

      /// <summary>
      /// Enable logging of certain virtual table module exceptions that cannot
      /// be easily discovered via other means.
      /// </summary>
      LogModuleException = 0x4000,

      /// <summary>
      /// When binding and returning column values, always treat them as though
      /// they were plain text (i.e. no numeric, date/time, or other conversions
      /// should be attempted).
      /// </summary>
      BindAndGetAllAsText = BindAllAsText | GetAllAsText,

      /// <summary>
      /// Enable all logging.
      /// </summary>
      LogAll = LogPrepare | LogPreBind | LogBind |
               LogCallbackException | LogBackup | LogModuleError |
               LogModuleException,

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

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

        if (_sql == null)
            throw new InvalidOperationException(
                "Database connection not valid for creating modules.");

        if ((_flags & SQLiteConnectionFlags.NoCreateModule) == SQLiteConnectionFlags.NoCreateModule)
            throw new SQLiteException("Creating modules is disabled for this database connection.");

        _sql.CreateModule(module);
    }
#endif

    /// <summary>
    /// Parses a string containing a sequence of zero or more hexadecimal
    /// encoded byte values and returns the resulting byte array.  The
    /// "0x" prefix is not allowed on the input string.

        if (_sql == null)
            throw new InvalidOperationException(
                "Database connection not valid for creating modules.");

        if ((_flags & SQLiteConnectionFlags.NoCreateModule) == SQLiteConnectionFlags.NoCreateModule)
            throw new SQLiteException("Creating modules is disabled for this database connection.");

        _sql.CreateModule(module, _flags);
    }
#endif

    /// <summary>
    /// Parses a string containing a sequence of zero or more hexadecimal
    /// encoded byte values and returns the resulting byte array.  The
    /// "0x" prefix is not allowed on the input string.