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int sqlite3changeset_start( sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */ int nChangeset, /* Size of changeset blob in bytes */ void *pChangeset /* Pointer to blob containing changeset */ );
Create an iterator used to iterate through the contents of a changeset. If successful, *pp is set to point to the iterator handle and SQLITE_OK is returned. Otherwise, if an error occurs, *pp is set to zero and an SQLite error code is returned.
The following functions can be used to advance and query a changeset iterator created by this function:
It is the responsibility of the caller to eventually destroy the iterator by passing it to sqlite3changeset_finalize(). The buffer containing the changeset (pChangeset) must remain valid until after the iterator is destroyed.
Assuming the changeset blob was created by one of the sqlite3session_changeset(), sqlite3changeset_concat() or sqlite3changeset_invert() functions, all changes within the changeset that apply to a single table are grouped together. This means that when an application iterates through a changeset using an iterator created by this function, all changes that relate to a single table are visited consecutively. There is no chance that the iterator will visit a change the applies to table X, then one for table Y, and then later on visit another change for table X.