System.Data.SQLite

  {
    if(!DbHasProperty(*ppdb, 0, DB_SchemaLoaded))
      ENC(*ppdb) = SQLITE_UTF16NATIVE;
  }
  return ret;
}



















__declspec(dllexport) const char * WINAPI sqlite3_errmsg_interop(sqlite3 *db, int *plen)
{
  const char *pval = sqlite3_errmsg(db);
  *plen = (pval != 0) ? strlen(pval) : 0;
  return pval;
}

    internal override int Changes
    {
      get
      {
        return UnsafeNativeMethods.sqlite3_changes(_sql);
      }
    }

    /// <summary>
    /// Shutdown the SQLite engine so that it can be restarted with different config options.
    /// We depend on auto initialization to recover.
    /// </summary>
    /// <returns>Returns a result code</returns>
    internal override int Shutdown()
    {
        int rc = UnsafeNativeMethods.sqlite3_shutdown();
        return rc;
    }

    internal override void Open(string strFilename, SQLiteOpenFlagsEnum flags, int maxPoolSize, bool usePool)
    {
      if (_sql != null) return;

      _usePool = usePool;
      if (usePool)

    {
      return UnsafeNativeMethods.sqlite3_aggregate_context(context, 1);
    }

    /// Enables or disabled extended result codes returned by SQLite
    internal override void SetExtendedResultCodes(bool bOnOff)
    {



      UnsafeNativeMethods.sqlite3_extended_result_codes(_sql, (bOnOff ? -1 : 0));

    }
    /// Gets the last SQLite error code
    internal override int ResultCode()
    {



      return UnsafeNativeMethods.sqlite3_errcode(_sql);

    }
    /// Gets the last SQLite extended error code
    internal override int ExtendedResultCode()
    {



      return UnsafeNativeMethods.sqlite3_extended_errcode(_sql);

    }

    internal override void SetPassword(byte[] passwordBytes)
    {
      int n = UnsafeNativeMethods.sqlite3_key(_sql, passwordBytes, passwordBytes.Length);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

      UnsafeNativeMethods.sqlite3_trace(_sql, func, IntPtr.Zero);
    }

    internal override void SetRollbackHook(SQLiteRollbackCallback func)
    {
      UnsafeNativeMethods.sqlite3_rollback_hook(_sql, func, IntPtr.Zero);
    }

    /// <summary>
    /// Allows the setting of a logging callback invoked by SQLite when a
    /// log event occurs.  Only one callback may be set.  If NULL is passed,
    /// the logging callback is unregistered.
    /// </summary>
    /// <param name="func">The callback function to invoke.</param>
    /// <returns>Returns a result code</returns>
    internal override int SetLogCallback(SQLiteLogCallback func)
    {
        int rc = UnsafeNativeMethods.sqlite3_config((int)SQLiteConfigOpsEnum.SQLITE_CONFIG_LOG, func, (IntPtr)0);
        return rc;
    }

    /// <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 name="index">The column index to retrieve</param>
    /// <param name="typ">The type of data contained in the column.  If Uninitialized, this function will retrieve the datatype information.</param>

    /// </summary>
    internal abstract string Version { get; }
    /// <summary>
    /// Returns the number of changes the last executing insert/update caused.
    /// </summary>
    internal abstract int Changes { get; }
    /// <summary>
    /// Shutdown the SQLite engine so that it can be restarted with different config options.
    /// We depend on auto initialization to recover.
    /// </summary>
    internal abstract int Shutdown();
    /// <summary>
    /// Opens a database.
    /// </summary>
    /// <remarks>
    /// Implementers should call SQLiteFunction.BindFunctions() and save the array after opening a connection
    /// to bind all attributed user-defined functions and collating sequences to the new connection.
    /// </remarks>
    /// <param name="strFilename">The filename of the database to open.  SQLite automatically creates it if it doesn't exist.</param>

    internal abstract void SetPassword(byte[] passwordBytes);
    internal abstract void ChangePassword(byte[] newPasswordBytes);

    internal abstract void SetUpdateHook(SQLiteUpdateCallback func);
    internal abstract void SetCommitHook(SQLiteCommitCallback func);
    internal abstract void SetTraceCallback(SQLiteTraceCallback func);
    internal abstract void SetRollbackHook(SQLiteRollbackCallback func);
    internal abstract int SetLogCallback(SQLiteLogCallback func);

    internal abstract int GetCursorForTable(SQLiteStatement stmt, int database, int rootPage);
    internal abstract long GetRowIdForCursor(SQLiteStatement stmt, int cursor);

    internal abstract object GetValue(SQLiteStatement stmt, int index, SQLiteType typ);

    internal abstract bool AutoCommit

    None = 0,
    ReadOnly = 0x01,
    ReadWrite = 0x02,
    Create = 0x04,
    SharedCache = 0x01000000,
    Default = 0x06,
  }

  // These are the options to the internal sqlite3_config call.
  internal enum SQLiteConfigOpsEnum
  {
    SQLITE_CONFIG_SINGLETHREAD = 1, // nil 
    SQLITE_CONFIG_MULTITHREAD = 2, // nil 
    SQLITE_CONFIG_SERIALIZED = 3, // nil 
    SQLITE_CONFIG_MALLOC = 4, // sqlite3_mem_methods* 
    SQLITE_CONFIG_GETMALLOC = 5, // sqlite3_mem_methods* 
    SQLITE_CONFIG_SCRATCH = 6, // void*, int sz, int N 
    SQLITE_CONFIG_PAGECACHE = 7, // void*, int sz, int N 
    SQLITE_CONFIG_HEAP = 8, // void*, int nByte, int min 
    SQLITE_CONFIG_MEMSTATUS = 9, // boolean 
    SQLITE_CONFIG_MUTEX = 10, // sqlite3_mutex_methods* 
    SQLITE_CONFIG_GETMUTEX = 11, // sqlite3_mutex_methods* 
    // previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused
    SQLITE_CONFIG_LOOKASIDE = 13, // int int 
    SQLITE_CONFIG_PCACHE = 14, // sqlite3_pcache_methods* 
    SQLITE_CONFIG_GETPCACHE = 15, // sqlite3_pcache_methods* 
    SQLITE_CONFIG_LOG = 16, // xFunc, void* 
  }

}

    internal long _version;

    private event SQLiteUpdateEventHandler _updateHandler;
    private event SQLiteCommitHandler _commitHandler;
    private event SQLiteTraceEventHandler _traceHandler;
    private event EventHandler _rollbackHandler;
    private event SQLiteLogEventHandler _logHandler;

    private SQLiteUpdateCallback _updateCallback;
    private SQLiteCommitCallback _commitCallback;
    private SQLiteTraceCallback _traceCallback;
    private SQLiteRollbackCallback _rollbackCallback;
    private SQLiteLogCallback _logCallback;

    /// <summary>
    /// This event is raised whenever the database is opened or closed.
    /// </summary>
    public override event StateChangeEventHandler StateChange;

    ///<overloads>

          cnn._transactionLevel = _transactionLevel;
          cnn._enlistment = _enlistment;
          cnn._connectionState = _connectionState;
          cnn._version = _version;

          cnn._enlistment._transaction._cnn = cnn;
          cnn._enlistment._disposeConnection = true;

          _sql = null;
          _enlistment = null;
        }
#endif
        if (_sql != null)
        {
          _sql.Close();

         fileName = Path.GetDirectoryName(System.Reflection.Assembly.GetCallingAssembly().GetName().CodeBase) + fileName.Substring(1);
#endif
       fileName = ExpandFileName(fileName);
      }
      try
      {
        bool usePooling = (SQLiteConvert.ToBoolean(FindKey(opts, "Pooling", Boolean.FalseString)) == true);

        int maxPoolSize = Convert.ToInt32(FindKey(opts, "Max Pool Size", "100"), CultureInfo.InvariantCulture);

        _defaultTimeout = Convert.ToInt32(FindKey(opts, "Default Timeout", "30"), CultureInfo.CurrentCulture);

        _defaultIsolation = (IsolationLevel)Enum.Parse(typeof(IsolationLevel), FindKey(opts, "Default IsolationLevel", "Serializable"), true);
        if (_defaultIsolation != IsolationLevel.Serializable && _defaultIsolation != IsolationLevel.ReadCommitted)
          throw new NotSupportedException("Invalid Default IsolationLevel specified");


        //string temp = FindKey(opts, "DateTimeFormat", "ISO8601");
        //if (String.Compare(temp, "ticks", StringComparison.OrdinalIgnoreCase) == 0) dateFormat = SQLiteDateFormats.Ticks;
        //else if (String.Compare(temp, "julianday", StringComparison.OrdinalIgnoreCase) == 0) dateFormat = SQLiteDateFormats.JulianDay;

        if (_sql == null)
        {
          bool bUTF16 = (SQLiteConvert.ToBoolean(FindKey(opts, "UseUTF16Encoding", Boolean.FalseString)) == true);
          SQLiteDateFormats dateFormat = (SQLiteDateFormats)Enum.Parse(typeof(SQLiteDateFormats),
                                                                       FindKey(opts, "DateTimeFormat", "ISO8601"),
                                                                       true);

        if (bUTF16) // SQLite automatically sets the encoding of the database to UTF16 if called from sqlite3_open16()
          _sql = new SQLite3_UTF16(dateFormat);
        else
          _sql = new SQLite3(dateFormat);

          if (_sql != null && _logHandler != null)
          {
              if (_logCallback == null) _logCallback = new SQLiteLogCallback(LogCallback);
              if (_logCallback != null) _sql.SetLogCallback(_logCallback);
          }
        }

        SQLiteOpenFlagsEnum flags = SQLiteOpenFlagsEnum.None;

        if (SQLiteConvert.ToBoolean(FindKey(opts, "FailIfMissing", Boolean.FalseString)) == false)
          flags |= SQLiteOpenFlagsEnum.Create;

        if (SQLiteConvert.ToBoolean(FindKey(opts, "Read Only", Boolean.FalseString)) == true)

    public override ConnectionState State
    {
      get
      {
        return _connectionState;
      }
    }

    /// Passes a shutdown request off to SQLite.
    public int Shutdown()
    {
        // make sure we have an instance of the base class
        if (_sql == null)
        {
            SortedList<string, string> opts = ParseConnectionString(_connectionString);

            bool bUTF16 = (SQLiteConvert.ToBoolean(FindKey(opts, "UseUTF16Encoding", Boolean.FalseString)) == true);
            SQLiteDateFormats dateFormat = (SQLiteDateFormats)Enum.Parse(typeof(SQLiteDateFormats),
                                                                         FindKey(opts, "DateTimeFormat", "ISO8601"),
                                                                         true);

            if (bUTF16) // SQLite automatically sets the encoding of the database to UTF16 if called from sqlite3_open16()
                _sql = new SQLite3_UTF16(dateFormat);
            else
                _sql = new SQLite3(dateFormat);
        }
        if (_sql != null) return _sql.Shutdown();
        throw new InvalidOperationException("Database connection not active.");
    }

    /// Enables or disabled extended result codes returned by SQLite
    public void SetExtendedResultCodes(bool bOnOff)
    {
      if (_sql != null) _sql.SetExtendedResultCodes(bOnOff);
    }
    /// Enables or disabled extended result codes returned by SQLite

      return (e.AbortTransaction == true) ? 1 : 0;
    }

    private void RollbackCallback(IntPtr parg)
    {
      _rollbackHandler(this, EventArgs.Empty);
    }

    /// <summary>
    /// This event is raised whenever SQLite raises a logging event.
    /// </summary>
    public event SQLiteLogEventHandler Log
    {
        add
        {
            _logHandler += value;
            // callback handler will be set/removed at open/close
        }
        remove
        {
            _logHandler -= value;
            if (_logHandler==null)
            {
                _sql.SetLogCallback(null);
                _logCallback = null;
            }

        }
    }

    private void LogCallback(IntPtr puser, int err_code, IntPtr message)
    {
        if (_logHandler != null) 
            _logHandler(this, 
                        new LogEventArgs(puser, 
                                         err_code,
                                         SQLiteBase.UTF8ToString(message, -1)));
    }

  }

  /// <summary>
  /// The I/O file cache flushing behavior for the connection
  /// </summary>
  public enum SynchronizationModes
  {

    Off = 2,
  }

#if !PLATFORM_COMPACTFRAMEWORK
  [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
#endif
  internal delegate void SQLiteUpdateCallback(IntPtr puser, int type, IntPtr database, IntPtr table, Int64 rowid);

#if !PLATFORM_COMPACTFRAMEWORK
  [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
#endif
  internal delegate int SQLiteCommitCallback(IntPtr puser);

#if !PLATFORM_COMPACTFRAMEWORK
  [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
#endif
  internal delegate void SQLiteTraceCallback(IntPtr puser, IntPtr statement);

#if !PLATFORM_COMPACTFRAMEWORK
  [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
#endif
  internal delegate void SQLiteRollbackCallback(IntPtr puser);

#if !PLATFORM_COMPACTFRAMEWORK
  [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
#endif
  internal delegate void SQLiteLogCallback(IntPtr puser, int err_code, IntPtr message);

  /// <summary>
  /// Raised when a transaction is about to be committed.  To roll back a transaction, set the 
  /// rollbackTrans boolean value to true.
  /// </summary>
  /// <param name="sender">The connection committing the transaction</param>
  /// <param name="e">Event arguments on the transaction</param>
  public delegate void SQLiteCommitHandler(object sender, CommitEventArgs e);

  /// <summary>
  /// Raised when a statement first begins executing on a given connection
  /// </summary>
  /// <param name="sender">The connection executing the statement</param>
  /// <param name="e">Event arguments on the trace</param>
  public delegate void SQLiteTraceEventHandler(object sender, TraceEventArgs e);

  /// <summary>
  /// Raised when a log event occurs.
  /// </summary>
  /// <param name="sender">The current connection</param>
  /// <param name="e">Event arguments on the trace</param>
  public delegate void SQLiteLogEventHandler(object sender, LogEventArgs e);

  /// <summary>
  /// Whenever an update event is triggered on a connection, this enum will indicate
  /// exactly what type of operation is being performed.
  /// </summary>
  public enum UpdateEventType
  {
    /// <summary>

    public readonly string Statement;

    internal TraceEventArgs(string statement)
    {
      Statement = statement;
    }
  }

  /// <summary>
  /// Passed during an Log callback
  /// </summary>
  public class LogEventArgs : EventArgs
  {
      /// <summary>
      /// The error code.
      /// </summary>
      public readonly int ErrorCode;

      /// <summary>
      /// SQL statement text as the statement first begins executing
      /// </summary>
      public readonly string Message;

      internal LogEventArgs(IntPtr puser, int err_code, string message)
      {
          // puser should be NULL
          ErrorCode = err_code;
          Message = message;
      }
  }

}

#endif // USE_INTEROP_DLL

#else
    private const string SQLITE_DLL = "sqlite3";
#endif

    // This section uses interop calls that also fetch text length to optimize conversion.  
    // When using the standard dll, we can replace these calls with normal sqlite calls and 
    // do unoptimized conversions instead afterwards
    #region interop added textlength calls

#if !SQLITE_STANDARD

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_bind_parameter_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_database_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_text_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_text16_interop(IntPtr stmt, int index, out int len);










    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_errmsg_interop(IntPtr db, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_prepare_interop(IntPtr db, IntPtr pSql, int nBytes, out IntPtr stmt, out IntPtr ptrRemain, out int nRemain);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_table_column_metadata_interop(IntPtr db, byte[] dbName, byte[] tblName, byte[] colName, out IntPtr ptrDataType, out IntPtr ptrCollSeq, out int notNull, out int primaryKey, out int autoInc, out int dtLen, out int csLen);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_value_text_interop(IntPtr p, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_value_text16_interop(IntPtr p, out int len);

#endif
// !SQLITE_STANDARD

    #endregion

    // These functions add existing functionality on top of SQLite and require a little effort to
    // get working when using the standard SQLite library.
    #region interop added functionality

#if !SQLITE_STANDARD

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_close_interop(IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_create_function_interop(IntPtr db, byte[] strName, int nArgs, int nType, IntPtr pvUser, SQLiteCallback func, SQLiteCallback fstep, SQLiteFinalCallback ffinal, int needCollSeq);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_finalize_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_open_interop(byte[] utf8Filename, int flags, out IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_open16_interop(byte[] utf8Filename, int flags, out IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_reset_interop(IntPtr stmt);

#endif
// !SQLITE_STANDARD

    #endregion

    // The standard api call equivalents of the above interop calls
    #region standard versions of interop functions

#if SQLITE_STANDARD

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_close(IntPtr db);

    [DllImport(SQLITE_DLL)]
#endif
    internal static extern IntPtr sqlite3_column_text16(IntPtr stmt, int index);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else





















    [DllImport(SQLITE_DLL)]
#endif
    internal static extern IntPtr sqlite3_errmsg(IntPtr db);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern IntPtr sqlite3_value_text16(IntPtr p);

#endif
// SQLITE_STANDARD

    #endregion

    // These functions are custom and have no equivalent standard library method.
    // All of them are "nice to haves" and not necessarily "need to haves".
    #region no equivalent standard method

#if !SQLITE_STANDARD

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_context_collseq(IntPtr context, out int type, out int enc, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_context_collcompare(IntPtr context, byte[] p1, int p1len, byte[] p2, int p2len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_cursor_rowid(IntPtr stmt, int cursor, out long rowid);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_index_column_info_interop(IntPtr db, byte[] catalog, byte[] IndexName, byte[] ColumnName, out int sortOrder, out int onError, out IntPtr Collation, out int colllen);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_resetall_interop(IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_table_cursor(IntPtr stmt, int db, int tableRootPage);

#endif
// !SQLITE_STANDARD

    #endregion

    // Standard API calls global across versions.  There are a few instances of interop calls
    // scattered in here, but they are only active when PLATFORM_COMPACTFRAMEWORK is declared.
    #region standard sqlite api calls

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_changes(IntPtr db);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_shutdown();

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_busy_timeout(IntPtr db, int ms);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern IntPtr sqlite3_trace(IntPtr db, SQLiteTraceCallback func, IntPtr pvUser);

    // Since sqlite3_config() takes a variable argument list, we have to overload declarations
    // for all possible calls.  For now, we are only exposing the SQLITE_CONFIG_LOG call.
#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_config(int op, SQLiteLogCallback func, IntPtr pvUser);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern IntPtr sqlite3_rollback_hook(IntPtr db, SQLiteRollbackCallback func, IntPtr pvUser);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_get_autocommit(IntPtr db);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_extended_result_codes(IntPtr db, int onoff);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_errcode(IntPtr db);

#if !PLATFORM_COMPACTFRAMEWORK
    [DllImport(SQLITE_DLL, CallingConvention = CallingConvention.Cdecl)]
#else
    [DllImport(SQLITE_DLL)]
#endif
    internal static extern int sqlite3_extended_errcode(IntPtr db);


    #endregion
  }

#if PLATFORM_COMPACTFRAMEWORK
  internal abstract class CriticalHandle : IDisposable
  {

        // Turn on extended result codes
        cnn.SetExtendedResultCodes(true);

        int rc = cnn.ResultCode();
        int xrc = cnn.ExtendedResultCode();

        cnn.Close();
      }
    }

    //Applying EventHandler
    public void OnLogEvent(object sender, LogEventArgs logEvent)
    {
        int err_code = logEvent.ErrorCode;
        string err_msg = logEvent.Message;
    }

    /// <summary>
    /// Tests SQLITE_CONFIG_LOG support.
    /// </summary>
    [Test]
    internal void SetLogCallbackTest()
    {
        if (_factstring.ToLower().Contains("sqlite"))
        {
            SQLiteConnection cnn = new SQLiteConnection(_cnnstring.ConnectionString);

            cnn.Shutdown();  // we need to shutdown so that we can change config options

            SQLiteLogEventHandler logHandler = new SQLiteLogEventHandler(OnLogEvent); 
            cnn.Log += logHandler;

            cnn.Open();

            maydroptable.Add("LogCallbackTest");
            if (cnn.State != ConnectionState.Open) cnn.Open();
            using (DbCommand cmd = cnn.CreateCommand())
            {
                cmd.CommandText = "CREATE TABLE LogCallbackTest(ID int primary key)";
                cmd.ExecuteNonQuery();
            }

            cnn.Close();

            cnn.Shutdown();  // we need to shutdown so that we can change config options

            // remove the log handler before the connection is closed.
            cnn.Log -= logHandler;

      }
    }

    /// <summary>
    /// Open a reader and then attempt to write to test the writer's command timeout property
    /// SQLite doesn't allow a write when a reader is active.
    /// *** NOTE AS OF 3.3.8 this test no longer blocks because SQLite now allows you to update table(s)