open
Description:
[ Version ( deprecated = true ,  deprecated_since = "3.8" ,  since = "3.2" ) ]
public virtual async bool open (bool only_if_exists, Cancellable? cancellable) throws Error
  public virtual async bool open (bool only_if_exists, Cancellable? cancellable) throws Error
Warning: open is deprecated since 3.8.
Opens the this, making it ready for queries and other operations.
Note: 
      
        
    
    Use e_book_client_connect and e_book_client_connect_finish or e_cal_client_connect and 
            e_cal_client_connect_finish instead.
 The call is finished by open.end from the callback.
Parameters:
| this | an Client | 
| only_if_exists | this parameter is not used anymore | 
| cancellable | a Cancellable; can be  | 
| callback | callback to call when a result is ready | 
| user_data | user data for the  |