1. 持久存储，永不过期
kv_set('key1', 'value1');
kv_get('key1');
kv_delete('key1');

2. 缓存，可以设置过期时间
cache_set('key1', 'value1', 60);
cache_get('key1');
cache_delete('key1');

3. 持久存储，cache加速
kv_cache_set('key1', 'value1');
kv_cache_get('key1');
kv_cache_delete('key1');

4. 合并到setting进行存储，持久存储，并且通过cache加速（如果开启cache）
setting_set('key1');
setting_get('key1', 'value1');
setting_delete('key1');

5. 合并到runtime中进行存储，持久存储，并且通过cache加速（如果开启cache）
runtime_set('key1');
runtime_get('key1', 'value1');
runtime_delete('key1');