System.Data.SQLite

        ISQLiteChangeSetMetadataItem item
    );
    #endregion

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

    #region ISQLiteChangeSet Interface
    /// <summary>
    /// This interface contains methods used to manipulate a set of changes for
    /// a database.
    /// </summary>
    public interface ISQLiteChangeSet :
        IEnumerable<ISQLiteChangeSetMetadataItem>, IDisposable
    {
        ISQLiteChangeSet Invert();
        ISQLiteChangeSet CombineWith(ISQLiteChangeSet changeSet);

        void Apply(

        );
    }
    #endregion

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

    #region ISQLiteChangeGroup Interface
    /// <summary>
    /// This interface contains methods used to manipulate multiple sets of
    /// changes for a database.
    /// </summary>
    public interface ISQLiteChangeGroup : IDisposable
    {
        /// <summary>
        /// Attempts to add a change set (or patch set) to this change group
        /// instance.  The underlying data must be contained entirely within
        /// the <paramref name="rawData" /> byte array.
        /// </summary>
        /// <param name="rawData">
        /// The raw byte data for the specified change set (or patch set).
        /// </param>
        void AddChangeSet(byte[] rawData);

        /// <summary>
        /// Attempts to add a change set (or patch set) to this change group
        /// instance.  The underlying data will be read from the specified
        /// <see cref="Stream" />.
        /// </summary>
        /// <param name="stream">
        /// The <see cref="Stream" /> instance containing the raw change set
        /// (or patch set) data to read.
        /// </param>
        void AddChangeSet(Stream stream);

        /// <summary>
        /// Attempts to create and return, via <paramref name="rawData" />, the
        /// combined set of changes represented by this change group instance.
        /// </summary>
        /// <param name="rawData">
        /// Upon success, this will contain the raw byte data for all the
        /// changes in this change group instance.
        /// </param>
        void CreateChangeSet(ref byte[] rawData);

        /// <summary>
        /// Attempts to create and write, via <paramref name="stream" />, the
        /// combined set of changes represented by this change group instance.
        /// </summary>
        /// <param name="stream">
        /// Upon success, the raw byte data for all the changes in this change
        /// group instance will be written to this <see cref="Stream" />.
        /// </param>
        void CreateChangeSet(Stream stream);
    }
    #endregion

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

    #region ISQLiteChangeSetMetadataItem Interface
    /// <summary>
    /// This interface contains properties and methods used to fetch metadata
    /// about one change within a set of changes for a database.
    /// </summary>
    public interface ISQLiteChangeSetMetadataItem : IDisposable
    {
        /// <summary>
        /// The name of the table the change was made to.
        /// </summary>
        string TableName { get; }

        /// <summary>
        /// The number of columns impacted by this change.  This value can be
        /// used to determine the highest valid column index that may be used
        /// with the <see cref="GetOldValue" />, <see cref="GetNewValue" />,
        /// and <see cref="GetConflictValue" /> methods of this interface.  It
        /// will be this value minus one.
        /// </summary>
        int NumberOfColumns { get; }

        /// <summary>
        /// This will contain the value
        /// <see cref="SQLiteAuthorizerActionCode.Insert" />,
        /// <see cref="SQLiteAuthorizerActionCode.Update" />, or
        /// <see cref="SQLiteAuthorizerActionCode.Delete" />, corresponding to
        /// the overall type of change this item represents.
        /// </summary>
        SQLiteAuthorizerActionCode OperationCode { get; }

        /// <summary>
        /// Non-zero if this change is considered to be indirect (i.e. as
        /// though they were made via a trigger or foreign key action).
        /// </summary>
        bool Indirect { get; }

        /// <summary>
        /// This array contains a <see cref="Boolean" /> for each column in
        /// the table associated with this change.  The element will be zero
        /// if the column is not part of the primary key; otherwise, it will
        /// be non-zero.
        /// </summary>
        bool[] PrimaryKeyColumns { get; }

        /// <summary>
        /// This method may only be called from within a
        /// <see cref="SessionConflictCallback" /> delegate when the conflict
        /// type is <see cref="SQLiteChangeSetConflictType.ForeignKey" />.  It
        /// returns the total number of known foreign key violations in the
        /// destination database.
        /// </summary>
        int NumberOfForeignKeyConflicts { get; }

        /// <summary>
        /// Queries and returns the original value of a given column for this
        /// change.  This method may only be called when the
        /// <see cref="OperationCode" /> has a value of
        /// <see cref="SQLiteAuthorizerActionCode.Update" /> or
        /// <see cref="SQLiteAuthorizerActionCode.Delete" />.
        /// </summary>
        /// <param name="columnIndex">
        /// The index for the column.  This value must be between zero and one
        /// less than the total number of columns for this table.
        /// </param>
        /// <returns>
        /// The original value of a given column for this change.
        /// </returns>
        SQLiteValue GetOldValue(int columnIndex);

        /// <summary>
        /// Queries and returns the updated value of a given column for this
        /// change.  This method may only be called when the
        /// <see cref="OperationCode" /> has a value of
        /// <see cref="SQLiteAuthorizerActionCode.Insert" /> or
        /// <see cref="SQLiteAuthorizerActionCode.Update" />.
        /// </summary>
        /// <param name="columnIndex">
        /// The index for the column.  This value must be between zero and one
        /// less than the total number of columns for this table.
        /// </param>
        /// <returns>
        /// The updated value of a given column for this change.
        /// </returns>
        SQLiteValue GetNewValue(int columnIndex);

        /// <summary>
        /// Queries and returns the conflicting value of a given column for
        /// this change.  This method may only be called from within a
        /// <see cref="SessionConflictCallback" /> delegate when the conflict
        /// type is <see cref="SQLiteChangeSetConflictType.Data" /> or
        /// <see cref="SQLiteChangeSetConflictType.Conflict" />.
        /// </summary>
        /// <param name="columnIndex">
        /// The index for the column.  This value must be between zero and one
        /// less than the total number of columns for this table.
        /// </param>
        /// <returns>
        /// The conflicting value of a given column for this change.
        /// </returns>
        SQLiteValue GetConflictValue(int columnIndex);
    }
    #endregion

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

    #region ISQLiteSession Interface
    /// <summary>
    /// This interface contains methods to query and manipulate the state of a
    /// change tracking session for a database.
    /// </summary>
    public interface ISQLiteSession : IDisposable
    {
        /// <summary>
        /// Determines if this session is currently tracking changes to its
        /// associated database.
        /// </summary>
        /// <returns>
        /// Non-zero if changes to the associated database are being trakced;
        /// otherwise, zero.
        /// </returns>
        bool IsEnabled();

        /// <summary>
        /// Enables tracking of changes to the associated database.
        /// </summary>
        void SetToEnabled();

        /// <summary>
        /// Disables tracking of changes to the associated database.
        /// </summary>
        void SetToDisabled();

        /// <summary>
        /// Determines if this session is currently set to mark changes as
        /// indirect (i.e. as though they were made via a trigger or foreign
        /// key action).
        /// </summary>
        /// <returns>
        /// Non-zero if changes to the associated database are being marked as
        /// indirect; otherwise, zero.
        /// </returns>
        bool IsIndirect();

        /// <summary>
        /// Sets the indirect flag for this session.  Subsequent changes will
        /// be marked as indirect until this flag is changed again.
        /// </summary>
        void SetToIndirect();

        /// <summary>
        /// Clears the indirect flag for this session.  Subsequent changes will
        /// be marked as direct until this flag is changed again.
        /// </summary>
        void SetToDirect();

        /// <summary>
        /// Determines if there are any tracked changes currently within the
        /// data for this session.
        /// </summary>
        /// <returns>
        /// Non-zero if there are no changes within the data for this session;
        /// otherwise, zero.
        /// </returns>
        bool IsEmpty();

        /// <summary>
        /// Upon success, causes changes to the specified table(s) to start
        /// being tracked.  Any tables impacted by calls to this method will
        /// not cause the <see cref="SessionTableFilterCallback" /> callback
        /// to be invoked.
        /// </summary>
        /// <param name="name">
        /// The name of the table to be tracked -OR- null to track all
        /// applicable tables within this database.
        /// </param>
        void AttachTable(string name);

        /// <summary>
        /// This method is used to set the table filter for this instance.
        /// </summary>
        /// <param name="callback">
        /// The table filter callback -OR- null to clear any existing table
        /// filter callback.
        /// </param>
        /// <param name="clientData">
        /// The optional application-defined context data.  This value may be
        /// null.
        /// </param>
        void SetTableFilter(
            SessionTableFilterCallback callback,
            object clientData
        );

        /// <summary>
        /// Attempts to create and return, via <paramref name="rawData" />, the
        /// combined set of changes represented by this session instance.
        /// </summary>
        /// <param name="rawData">
        /// Upon success, this will contain the raw byte data for all the
        /// changes in this session instance.
        /// </param>
        void CreateChangeSet(ref byte[] rawData);

        /// <summary>
        /// Attempts to create and write, via <paramref name="stream" />, the
        /// combined set of changes represented by this session instance.
        /// </summary>
        /// <param name="stream">
        /// Upon success, the raw byte data for all the changes in this session
        /// instance will be written to this <see cref="Stream" />.
        /// </param>
        void CreateChangeSet(Stream stream);

        /// <summary>
        /// Attempts to create and return, via <paramref name="rawData" />, the
        /// combined set of changes represented by this session instance as a
        /// patch set.
        /// </summary>
        /// <param name="rawData">
        /// Upon success, this will contain the raw byte data for all the
        /// changes in this session instance.
        /// </param>
        void CreatePatchSet(ref byte[] rawData);

        /// <summary>
        /// Attempts to create and write, via <paramref name="stream" />, the
        /// combined set of changes represented by this session instance as a
        /// patch set.
        /// </summary>
        /// <param name="stream">
        /// Upon success, the raw byte data for all the changes in this session
        /// instance will be written to this <see cref="Stream" />.
        /// </param>
        void CreatePatchSet(Stream stream);

        /// <summary>
        /// This method loads the differences between two tables [with the same
        /// name, set of columns, and primary key definition] into this session
        /// instance.
        /// </summary>
        /// <param name="fromDatabaseName">
        /// The name of the database containing the table with the original
        /// data (i.e. it will need updating in order to be identical to the
        /// one within the database associated with this session instance).
        /// </param>
        /// <param name="tableName">
        /// The name of the table.
        /// </param>
        void LoadDifferencesFromTable(
            string fromDatabaseName,
            string tableName
        );
    }
    #endregion

        /// </summary>
        /// <param name="context">
        /// Optional extra context information.  Currently, this will always
        /// have a value of <see cref="IntPtr.Zero" />.
        /// </param>
        /// <param name="pData">
        /// A preallocated native buffer to receive the requested input bytes.
        /// It must be at least <paramref name="nData" /> bytes in size.
        /// </param>
        /// <param name="nData">
        /// Upon entry, the number of bytes to read.  Upon exit, the number of
        /// bytes actually read.  This value may be zero upon exit.
        /// </param>
        /// <returns>
        /// The value <see cref="SQLiteErrorCode.Ok" /> upon success -OR- an

        /// </summary>
        /// <param name="context">
        /// Optional extra context information.  Currently, this will always
        /// have a value of <see cref="IntPtr.Zero" />.
        /// </param>
        /// <param name="pData">
        /// A preallocated native buffer containing the requested output
        /// bytes.  It must be at least <paramref name="nData" /> bytes in
        /// size.
        /// </param>
        /// <param name="nData">
        /// The number of bytes to write.
        /// </param>
        /// <returns>
        /// The value <see cref="SQLiteErrorCode.Ok" /> upon success -OR- an
        /// appropriate error code upon failure.