如何从parse.com查询数据

Question

我正在尝试从parse.com获取数据并且验证是否存在记录，如果是，则执行segue。

这是我的测试代码：

PFQuery *query = [PFQuery queryWithClassName:@"codes"];
[query whereKey:@"code" equalTo:_code.text];

[query findObjectsInBackgroundWithBlock:^(NSArray *comments, NSError *error) {
    // comments now contains the comments for myPost
    if (comments) {
        NSLog(@"Success!");
    }else{
        NSLog(@"Fail!");
    }
}];

解决方案：

NSString *code1 = _code.text;
NSNumber *code2 = [NSNumber numberWithInt:[code1 integerValue]];
// Assume PFObject *myPost was previously created.
PFQuery *query = [PFQuery queryWithClassName:@"present_codes"];
[query whereKey:@"code" equalTo:@([code2 integerValue])];

[query findObjectsInBackgroundWithBlock:^(NSArray *comments, NSError *error) {
    // comments now contains the comments for myPost
    if (comments.count > 0) {
        NSLog(@"Success!: %@", comments);
    }else{
        NSLog(@"Fail!: %@", comments);
    }
}];