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SQLite C Interface
Closing A Database Connection
int sqlite3_close(sqlite3 *);
The sqlite3_close() routine is the destructor for the sqlite3 object. Calls to sqlite3_close() return SQLITE_OK if the sqlite3 object is successfully destroyed and all associated resources are deallocated.
Applications must finalize all prepared statements and close all BLOB handles associated with the sqlite3 object prior to attempting to close the object. If sqlite3_close() is called on a database connection that still has outstanding prepared statements or BLOB handles, then it returns SQLITE_BUSY.
If sqlite3_close() is invoked while a transaction is open, the transaction is automatically rolled back.
The C parameter to sqlite3_close(C) must be either a NULL pointer or an sqlite3 object pointer obtained from sqlite3_open(), sqlite3_open16(), or sqlite3_open_v2(), and not previously closed. Calling sqlite3_close() with a NULL pointer argument is a harmless no-op.