sqlite: affected rows count (#16426)

vlib/sqlite/sqlite_test.v

@@ -10,6 +10,7 @@ fn test_sqlite() {
 	db.exec("create table users (id integer primary key, name text default '');")
 	db.exec("insert into users (name) values ('Sam')")
 	assert db.last_insert_rowid() == 1
+	assert db.get_affected_rows_count() == 1
 	db.exec("insert into users (name) values ('Peter')")
 	assert db.last_insert_rowid() == 2
 	db.exec("insert into users (name) values ('Kate')")
@@ -18,6 +19,11 @@ fn test_sqlite() {
 	assert nr_users == 3
 	name := db.q_string('select name from users where id = 1')
 	assert name == 'Sam'
+
+	// this insert will be rejected due to duplicated id
+	db.exec("insert into users (id,name) values (1,'Sam')")
+	assert db.get_affected_rows_count() == 0
+
 	users, mut code := db.exec('select * from users')
 	assert users.len == 3
 	assert code == 101
@@ -26,6 +32,19 @@ fn test_sqlite() {
 	user := db.exec_one('select * from users where id = 3') or { panic(err) }
 	println(user)
 	assert user.vals.len == 2
+
+	db.exec("update users set name='zzzz' where name='qqqq'")
+	assert db.get_affected_rows_count() == 0
+
+	db.exec("update users set name='Peter1' where name='Peter'")
+	assert db.get_affected_rows_count() == 1
+
+	db.exec("delete from users where name='qqqq'")
+	assert db.get_affected_rows_count() == 0
+
+	db.exec("delete from users where name='Sam'")
+	assert db.get_affected_rows_count() == 1
+
 	db.close() or { panic(err) }
 	assert !db.is_open
 }