核心数据-NSFetchRequest问题

Question

我的NSFetchRequest存在问题，它似乎未获取任何数据，代码如下：

-(void)addAnnotations 
{       
    NSFetchRequest *request = [[NSFetchRequest alloc] init];

    NSEntityDescription *entity = [NSEntityDescription entityForName:@"WayPoint" inManagedObjectContext:managedObjectContext];
    [request setEntity:entity];

    //NSPredicate *predicate = [NSPredicate predicateWithFormat:@"waypoint_map_id=%i", 98];
    //[request setPredicate:predicate];

    NSError *error;
    listArray = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
    [request release];

    NSLog(@"Array: ", listArray);
}

Answer 1

问题解决了：

NSLog(@"Array: %d", listArray);