/// <summary>
/// Constructor when recreating change set from previously generated and persisted change set buffer
/// </summary>
/// <param name="persistedBuffer">persisted data returned from previous change set generation buffer</param>
public SQLiteChangeSet(byte[] persistedBuffer)
{
this.size = 0;
this.buffer = new Sqlite3ChangesetBuffer(IntPtr.Zero);
if (persistedBuffer.Length > 0)
{
IntPtr nativeBuffer = SQLiteMalloc(persistedBuffer.Length);
// if malloc succeeded (not NULL) then copy managed data to sqlite's unmanaged memory buffer
if (nativeBuffer != IntPtr.Zero)
{
this.size = persistedBuffer.Length;
Marshal.Copy(persistedBuffer, 0, nativeBuffer, this.size);
this.buffer = new Sqlite3ChangesetBuffer(nativeBuffer);
}
}
}
private static extern Result ChangeSetApply(Sqlite3DatabaseHandle db, int changeSetBufferSize, Sqlite3ChangesetBuffer changeSetBuffer,
[MarshalAs(UnmanagedType.FunctionPtr)] FilterCallback xFilter,
[MarshalAs(UnmanagedType.FunctionPtr)] ConflictCallback xConflict,
IntPtr pCtx);
private static extern Result InvertChangeSet(int changeSetBufferSizeIn, Sqlite3ChangesetBuffer changeSetBufferIn,
out int changeSetBufferSizeOut, out Sqlite3ChangesetBuffer changeSetBufferOut);
private static extern Result ChangeSetStart(out Sqlite3ChangesetIterator iter, int changeSetBufferSize, Sqlite3ChangesetBuffer changeSetBuffer);
private static extern Result GenerateChangeSet(IntPtr session, out int changeSetBufferSize, out Sqlite3ChangesetBuffer changeSetBuffer);
/// <summary>
/// Constructor used via SQLite Session module when initially creating change set buffer
/// </summary>
/// <param name="size">count of bytes of buffer</param>
/// <param name="buffer">data used by SQLite Session module to reconstruct tables based on generated change set</param>
public SQLiteChangeSet(int size, Sqlite3ChangesetBuffer buffer)
{
this.size = size;
this.buffer = buffer;
}