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我有一个运行 sql server 数据库的服务器，我可以将数据从它发送到我的 iPhone。这是我使用的代码：

服务器上的 PHP

<?php
$headers = getallheaders();
$length = $headers['Content-Length'];
$input = fopen("php://input", "rb");
$json = json_decode(fread($input, $length));
fclose($input);
$search = $json->{'search'};
$value = $json->{'value'};

$serverName = "SOMEONE-PC\SQLEXPRESS";
$connectionInfo = array( "Database"=>"test");
$conn = sqlsrv_connect( $serverName, $connectionInfo);

$sql = "SELECT firstname, lastname
FROM testtable
WHERE $search='$value'";
$stmt = sqlsrv_query( $conn, $sql);
if( $stmt === false ) {
 die( print_r( sqlsrv_errors(), true));
}

while( $row = sqlsrv_fetch_array( $stmt ) ) {
    $arr = array('firstname' => $row['firstname'], 'lastname' => $row['lastname']);
echo json_encode($arr);
}

?>

我的 Objective-C 代码

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view.

    NSString *urlString = @"http://someipaddress";
    NSString *post = @"{\"search\":\"lastname\",\"value\":\"mylastname\"}";
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];

    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    _responseData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSLog(@"%i", ++_count);
    [_responseData appendData:data];
}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse*)cachedResponse {
    return nil;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"%@", [[NSString alloc] initWithData:_responseData encoding:NSStringEncodingConversionAllowLossy]);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

}

这给了我输出：

2013-11-12 22:58:03.743 httppostrequests[25708:70b] 1

2013-11-12 22:58:03.745 httppostrequests[25708:70b] {"firstname":"Thomas    ","lastname":"mylastname"}{"firstname":"person    ","lastname":"mylastname"}

我想知道是否可以更改服务器代码，以便多次调用 didRecieveData 以便数据以位发送而不是作为一个大文本发送。我只是好奇这是如何工作的，因为当我向“ http://www.google.com ”发出一个简单的请求时，didRecieveData 会被调用四次。

4

1 回答 1

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在NSURLConnectionDataDelegate的文档中，关于 didRecieveData 的内容如下Sent as a connection loads data incrementally。它还说This method provides the only way for an asynchronous delegate to retrieve the loaded data. It is the responsibility of the delegate to retain or copy this data as it is delivered.。从本质上讲，这意味着didRecieveData每次有一些数据块可用时都会调用它，谷歌获取分块的原因很可能是因为数据块的大小超过了谷歌的响应，但你的数据没有。

编辑：我不确定，但我认为使用分块传输编码会影响这一点。因此，如果您设置较小的块大小，它可能会按照您的意愿工作。

于 2013-11-12T22:31:00.327 回答