sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
The sqlite3_db_handle interface returns the database connection handle to which a prepared statement belongs. The database connection returned by sqlite3_db_handle is the same database connection that was the first argument to the sqlite3_prepare_v2() call (or its variants) that was used to create the statement in the first place.
See also lists of Objects, Constants, and Functions.
SQLite is in the Public Domain.
https://sqlite.org/c3ref/db_handle.html