System.Data.SQLite

    static SQLiteFactory()
    {
#if (SQLITE_STANDARD || USE_INTEROP_DLL || PLATFORM_COMPACTFRAMEWORK) && PRELOAD_NATIVE_LIBRARY
        UnsafeNativeMethods.Initialize();
#endif



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

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

              "{0}.", baseSchemaName), String.Empty);
        }
      }

      SQLiteConnectionFlags flags =
          (cnn != null) ? cnn.Flags : SQLiteConnectionFlags.Default;


      if ((flags & SQLiteConnectionFlags.LogPrepare) == SQLiteConnectionFlags.LogPrepare)
      {
          if ((strSql == null) || (strSql.Length == 0) || (strSql.Trim().Length == 0))
              SQLiteLog.LogMessage("Preparing {<nothing>}...");
          else
              SQLiteLog.LogMessage(String.Format(
                  CultureInfo.CurrentCulture, "Preparing {{{0}}}...", strSql));
      }


      IntPtr stmt = IntPtr.Zero;
      IntPtr ptr = IntPtr.Zero;
      int len = 0;
      SQLiteErrorCode n = SQLiteErrorCode.Schema;
      int retries = 0;
      byte[] b = ToUTF8(strSql);

      }
      finally
      {
        handle.Free();
      }
    }


    protected static void LogBind(SQLiteStatementHandle handle, int index)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(String.Format(
            "Binding statement {0} paramter #{1} as NULL...",
            handleIntPtr, index));

    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(String.Format(
            "Binding statement {0} paramter #{1} as type {2} with value {{{3}}}...",
            handleIntPtr, index, typeof(Byte[]), (value != null) ? ToHexadecimalString(value) : "<null>"));
    }


    internal override void Bind_Double(SQLiteStatement stmt, SQLiteConnectionFlags flags, int index, double value)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;


        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            LogBind(handle, index, value);
        }

#if !PLATFORM_COMPACTFRAMEWORK
        SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_bind_double(handle, index, value);
#else
        SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_bind_double_interop(handle, index, ref value);
#endif
        if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, GetLastError());
    }

    internal override void Bind_Int32(SQLiteStatement stmt, SQLiteConnectionFlags flags, int index, int value)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;


        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            LogBind(handle, index, value);
        }


        SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_bind_int(handle, index, value);
        if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, GetLastError());
    }

    internal override void Bind_UInt32(SQLiteStatement stmt, SQLiteConnectionFlags flags, int index, uint value)
    {

    }

    internal override int Bind_ParamCount(SQLiteStatement stmt, SQLiteConnectionFlags flags)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;
        int value = UnsafeNativeMethods.sqlite3_bind_parameter_count(handle);


        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(String.Format(
                "Statement {0} paramter count is {1}.",
                handleIntPtr, value));
        }


        return value;
    }

    internal override string Bind_ParamName(SQLiteStatement stmt, SQLiteConnectionFlags flags, int index)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;
        string name;

#if !SQLITE_STANDARD
        int len;
        name = UTF8ToString(UnsafeNativeMethods.sqlite3_bind_parameter_name_interop(handle, index, out len), len);
#else
        name = UTF8ToString(UnsafeNativeMethods.sqlite3_bind_parameter_name(handle, index), -1);
#endif


        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(String.Format(
                "Statement {0} paramter #{1} name is {{{2}}}.",
                handleIntPtr, index, name));
        }


        return name;
    }

    internal override int Bind_ParamIndex(SQLiteStatement stmt, SQLiteConnectionFlags flags, string paramName)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;
        int index = UnsafeNativeMethods.sqlite3_bind_parameter_index(handle, ToUTF8(paramName));


        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(String.Format(
                "Statement {0} paramter index of name {{{1}}} is #{2}.",
                handleIntPtr, paramName, index));
        }


        return index;
    }

    internal override int ColumnCount(SQLiteStatement stmt)
    {
      return UnsafeNativeMethods.sqlite3_column_count(stmt._sqlite_stmt);

    {
        //
        // BUGFIX: Prevent races with other threads for this entire block, due
        //         to the try/finally semantics.  See ticket [72905c9a77].
        //
        lock (syncRoot)
        {

            //
            // NOTE: Save the state of the logging class and then restore it
            //       after we are done to avoid logging too many false errors.
            //
            bool savedEnabled = SQLiteLog.Enabled;
            SQLiteLog.Enabled = false;

            try
            {

                //
                // NOTE: This method [ab]uses the fact that SQLite will always
                //       return SQLITE_ERROR for any unknown configuration option
                //       *unless* the SQLite library has already been initialized.
                //       In that case it will always return SQLITE_MISUSE.
                //
                SQLiteErrorCode rc = UnsafeNativeMethods.sqlite3_config_none(
                    SQLiteConfigOpsEnum.SQLITE_CONFIG_NONE);

                return (rc == SQLiteErrorCode.Misuse);

            }
            finally
            {
                SQLiteLog.Enabled = savedEnabled;
            }

        }
    }

    /// <summary>
    /// Helper function to retrieve a column of data from an active statement.
    /// </summary>
    /// <param name="stmt">The statement being step()'d through</param>

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

#if !INTEROP_LOG
      SQLiteLog.Initialize();
#endif

#if 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

              _versionNumber = SQLite3.SQLiteVersionNumber;

              if (_versionNumber >= 3007014)
                  SQLiteConnectionHandle.closeConnection = SQLiteBase.CloseConnectionV2;
          }
      }
#endif

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

                // NOTE: There is no point in calling the native API to copy
                //       zero pages as it does nothing; therefore, stop now.
                //
                if (pages == 0)
                    break;
            }
        }

        catch (Exception e)
        {
            if ((_flags & SQLiteConnectionFlags.LogBackup) == SQLiteConnectionFlags.LogBackup)
            {
                SQLiteLog.LogMessage(String.Format(
                    CultureInfo.CurrentCulture,
                    "Caught exception while backing up database: {0}", e));
            }

            throw;
        }

        finally
        {
            if (backup != null)
                sqliteBase.FinishBackup(backup); /* throw */
        }
    }
    #endregion

    {
        try
        {
            _context = context;
            SetReturnValue(context,
                Invoke(ConvertParams(nArgs, argsptr))); /* throw */
        }

        catch (Exception e) /* NOTE: Must catch ALL. */
        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(COR_E_EXCEPTION, String.Format(
                        CultureInfo.CurrentCulture,
                        "Caught exception in \"Invoke\" method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }
        }






    }

    /// <summary>
    /// Internal collation sequence function, which wraps up the raw string pointers and executes the Compare() virtual function.
    /// WARNING: Must not throw exceptions.
    /// </summary>
    /// <param name="ptr">Not used</param>
    /// <param name="len1">Length of the string pv1</param>
    /// <param name="ptr1">Pointer to the first string to compare</param>
    /// <param name="len2">Length of the string pv2</param>
    /// <param name="ptr2">Pointer to the second string to compare</param>
    /// <returns>Returns -1 if the first string is less than the second.  0 if they are equal, or 1 if the first string is greater
    /// than the second.  Returns 0 if an exception is caught.</returns>
    internal int CompareCallback(IntPtr ptr, int len1, IntPtr ptr1, int len2, IntPtr ptr2)
    {
        try
        {
            return Compare(SQLiteConvert.UTF8ToString(ptr1, len1),
                SQLiteConvert.UTF8ToString(ptr2, len2)); /* throw */
        }

        catch (Exception e) /* NOTE: Must catch ALL. */
        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(COR_E_EXCEPTION, String.Format(
                        CultureInfo.CurrentCulture,
                        "Caught exception in \"Compare\" (UTF8) method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }
        }







        //
        // NOTE: This must be done to prevent the core SQLite library from
        //       using our (invalid) result.
        //
        if (_base != null)
            _base.Cancel();

    internal int CompareCallback16(IntPtr ptr, int len1, IntPtr ptr1, int len2, IntPtr ptr2)
    {
        try
        {
            return Compare(SQLite3_UTF16.UTF16ToString(ptr1, len1),
                SQLite3_UTF16.UTF16ToString(ptr2, len2)); /* throw */
        }

        catch (Exception e) /* NOTE: Must catch ALL. */
        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(COR_E_EXCEPTION, String.Format(
                        CultureInfo.CurrentCulture,
                        "Caught exception in \"Compare\" (UTF16) method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }
        }







        //
        // NOTE: This must be done to prevent the core SQLite library from
        //       using our (invalid) result.
        //
        if (_base != null)
            _base.Cancel();

                    data._count, ref data._data); /* throw */
            }
            finally
            {
                data._count++;
            }
        }

        catch (Exception e) /* NOTE: Must catch ALL. */
        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(COR_E_EXCEPTION, String.Format(
                        CultureInfo.CurrentCulture,
                        "Caught exception in \"Step\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }
        }






    }

    /// <summary>
    /// An internal aggregate Final function callback, which wraps the context pointer and calls the virtual Final() method.
    /// WARNING: Must not throw exceptions.
    /// </summary>
    /// <param name="context">A raw context pointer</param>

            }
            finally
            {
                IDisposable disp = obj as IDisposable;
                if (disp != null) disp.Dispose(); /* throw */
            }
        }

        catch (Exception e) /* NOTE: Must catch ALL. */
        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(COR_E_EXCEPTION, String.Format(
                        CultureInfo.CurrentCulture,
                        "Caught exception in \"Final\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }
        }






    }

    /// <summary>
    /// Using reflection, enumerate all assemblies in the current appdomain looking for classes that
    /// have a SQLiteFunctionAttribute attribute, and registering them accordingly.
    /// </summary>
#if !PLATFORM_COMPACTFRAMEWORK

    /// </summary>
    /// <param name="sender">The current connection</param>
    /// <param name="e">Event arguments of the trace</param>
    public delegate void SQLiteLogEventHandler(object sender, LogEventArgs e);

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


    /// <summary>
    /// Manages the SQLite custom logging functionality and the associated
    /// callback for the whole process.
    /// </summary>
    public static class SQLiteLog
    {
        /// <summary>
        /// Object used to synchronize access to the static instance data
        /// for this class.
        /// </summary>
        private static object syncRoot = new object();

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

#if !PLATFORM_COMPACTFRAMEWORK
        /// <summary>
        /// Member variable to store the AppDomain.DomainUnload event handler.
        /// </summary>
        private static EventHandler _domainUnload;
#endif

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

        /// <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;

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

        /// <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;

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

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

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

        /// <summary>
        /// Initializes the SQLite logging facilities.
        /// </summary>
        public static void Initialize()
        {
            //
            // BUFXIX: We cannot initialize the logging interface if the SQLite
            //         core library has already been initialized anywhere in
            //         the process (see ticket [2ce0870fad]).
            //
            if (SQLite3.StaticIsInitialized())
                return;

#if !PLATFORM_COMPACTFRAMEWORK
            //
            // BUGFIX: To avoid nasty situations where multiple AppDomains are
            //         attempting to initialize and/or shutdown what is really
            //         a shared native resource (i.e. the SQLite core library
            //         is loaded per-process and has only one logging callback,
            //         not one per-AppDomain, which it knows nothing about),
            //         prevent all non-default AppDomains from registering a
            //         log handler unless the "Force_SQLiteLog" environment
            //         variable is used to manually override this safety check.
            //
            if (!AppDomain.CurrentDomain.IsDefaultAppDomain() &&
                Environment.GetEnvironmentVariable("Force_SQLiteLog") == null)
            {
                return;
            }
#endif

            lock (syncRoot)
            {
#if !PLATFORM_COMPACTFRAMEWORK
                //
                // NOTE: Add an event handler for the DomainUnload event so
                //       that we can unhook our logging managed function
                //       pointer from the native SQLite code prior to it
                //       being invalidated.
                //
                // BUGFIX: Make sure this event handler is only added one
                //         time (per-AppDomain).
                //
                if (_domainUnload == null)
                {
                    _domainUnload = new EventHandler(DomainUnload);
                    AppDomain.CurrentDomain.DomainUnload += _domainUnload;
                }
#endif

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

                //
                // NOTE: For now, always setup the default log event handler.
                //
                AddDefaultHandler();
            }
        }

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

#if !PLATFORM_COMPACTFRAMEWORK
        /// <summary>
        /// Handles the AppDomain being unloaded.
        /// </summary>
        /// <param name="sender">Should be null.</param>
        /// <param name="e">The data associated with this event.</param>
        private static void DomainUnload(
            object sender,

                if (_domainUnload != null)
                {
                    AppDomain.CurrentDomain.DomainUnload -= _domainUnload;
                    _domainUnload = null;
                }
            }
        }
#endif

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

        /// <summary>
        /// This event is raised whenever SQLite raises a logging event.
        /// Note that this should be set as one of the first things in the
        /// application.
        /// </summary>
        public static event SQLiteLogEventHandler Log

                lock (syncRoot)
                {
                    _handlers -= value;
                }
            }
        }

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

        /// <summary>
        /// If this property is true, logging is enabled; otherwise, logging is
        /// disabled.  When logging is disabled, no logging events will fire.
        /// </summary>
        public static bool Enabled
        {
            get { lock (syncRoot) { return _enabled; } }
            set { lock (syncRoot) { _enabled = value; } }
        }

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

        /// <summary>
        /// Log a message to all the registered log event handlers without going
        /// through the SQLite library.
        /// </summary>
        /// <param name="message">The message to be logged.</param>
        public static void LogMessage(
            string message
            )
        {
            LogMessage(null, message);
        }

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

        /// <summary>
        /// Log a message to all the registered log event handlers without going
        /// through the SQLite library.
        /// </summary>
        /// <param name="errorCode">The SQLite error code.</param>
        /// <param name="message">The message to be logged.</param>
        public static void LogMessage(
            SQLiteErrorCode errorCode,
            string message
            )
        {
            LogMessage((object)errorCode, message);
        }

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

        /// <summary>
        /// Log a message to all the registered log event handlers without going
        /// through the SQLite library.
        /// </summary>
        /// <param name="errorCode">The integer error code.</param>
        /// <param name="message">The message to be logged.</param>
        public static void LogMessage(
            int errorCode,
            string message
            )
        {
            LogMessage((object)errorCode, message);
        }

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

        /// <summary>
        /// Log a message to all the registered log event handlers without going
        /// through the SQLite library.
        /// </summary>
        /// <param name="errorCode">
        /// The error code.  The type of this object value should be

            }

            if (enabled && (handlers != null))
                handlers(null, new LogEventArgs(
                    IntPtr.Zero, errorCode, message, null));
        }

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

        /// <summary>
        /// Creates and initializes the default log event handler.
        /// </summary>
        private static void InitializeDefaultHandler()
        {
            lock (syncRoot)
            {
                if (_defaultHandler == null)
                    _defaultHandler = new SQLiteLogEventHandler(LogEventHandler);
            }
        }

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

        /// <summary>
        /// Adds the default log event handler to the list of handlers.
        /// </summary>
        public static void AddDefaultHandler()
        {
            InitializeDefaultHandler();
            Log += _defaultHandler;
        }

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

        /// <summary>
        /// Removes the default log event handler from the list of handlers.
        /// </summary>
        public static void RemoveDefaultHandler()
        {
            InitializeDefaultHandler();
            Log -= _defaultHandler;
        }

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

        /// <summary>
        /// Internal proxy function that calls any registered application log
        /// event handlers.
        ///
        /// WARNING: This method is used more-or-less directly by native code,
        ///          do not modify its type signature.

            }

            if (enabled && (handlers != null))
                handlers(null, new LogEventArgs(pUserData, errorCode,
                    SQLiteBase.UTF8ToString(pMessage, -1), null));
        }

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

        /// <summary>
        /// Default logger.  Currently, uses the Trace class (i.e. sends events
        /// to the current trace listeners, if any).
        /// </summary>
        /// <param name="sender">Should be null.</param>
        /// <param name="e">The data associated with this event.</param>
        private static void LogEventHandler(

            else if (errorCode is int)
                success = ((int)errorCode == 0);

            Trace.WriteLine(String.Format("SQLite {0} ({1}): {2}",
                success ? "message" : "error", errorCode, message));
        }
    }

}

      object obj = param.Value;
      DbType objType = param.DbType;

      if ((obj != null) && (objType == DbType.Object))
          objType = SQLiteConvert.TypeToDbType(obj.GetType());


      if ((_flags & SQLiteConnectionFlags.LogPreBind) == SQLiteConnectionFlags.LogPreBind)
      {
          IntPtr handle = _sqlite_stmt;

          SQLiteLog.LogMessage(String.Format(
              "Binding statement {0} paramter #{1} with database type {2} and raw value {{{3}}}...",
              handle, index, objType, obj));
      }


      if ((obj == null) || Convert.IsDBNull(obj))
      {
          _sql.Bind_Null(this, _flags, index);
        return;
      }