Method _db_lock

crates/stdlib/src/_sqlite3.rs:1007–1019

(&self, vm: &VirtualMachine)

        }

        fn _db_lock(&self, vm: &VirtualMachine) -> PyResult<PyMappedMutexGuard<'_, Sqlite>> {
            let guard = self.db.lock();
            if guard.is_some() {
                Ok(PyMutexGuard::map(guard, |x| unsafe {
                    x.as_mut().unwrap_unchecked()
                }))
            } else {
                Err(new_programming_error(
                    vm,
                    "Base Connection.__init__ not called.".to_owned(),
                ))
            }
        }

        #[pymethod]
        fn cursor(