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我需要在我的应用程序流程中正确处理标签。我怎样才能做到这一点？步骤是

  • 输入：纯文本标签
  • 转换为小写
  • 删除空格
  • 发送到 PHP 服务器
  • 在 SQL 中赋值给 $value
  • 向服务器的数据库提交请求
  • 输出：将结果（以 JSON 格式）返回到我的应用程序

目前的设计有11组，我根据点击的页面发送到不同的网址；我想扩展到 102 个组。

我认为可以使用 nsurlsession 发布我的 label.text（组名），将其发送到我的服务器，将其插入我的 SQL 代码，然后接收搜索结果。

// Toggle View Button (on button click open next view controller and populate table view with group matching data)

- (IBAction)ShowModels:(id)sender {

// 1. URL of the server page i want to send data to.
NSURL *url = [NSURL URLWithString:@"http://www.website.com/group.php"];

// 2. some how adapt this code to send grouplabel.text in plain text in lowercase without spaces.
NSDictionary *params = @{@"tableName": _groupLabel.text};

// 3. Adapt code to post the value of grouplabel.text to server.
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPMethod:@"POST"];

// 4. use a task to upload the data to the server and then have another task to recieve the completed data.
NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request
                                                             completionHandler:^(NSData *data,
                                                                                 NSURLResponse *response,
                                                                                 NSError *error)
                              {
                                  if (!error)
                                  {
                                      NSLog(@"Status code: %li", (long)((NSHTTPURLResponse *)response).statusCode);
                                  }
                                  else
                                  {
                                      NSLog(@"Error: %@", error.localizedDescription);
                                  }
                              }];

// 5. Run the completed task.
[task resume];

}

在这些阶段我需要改变什么？

服务器端代码：

<?php 

//connect to database.
include '../Includes/db-connect.php';

//set the table name variable

$table = "name"; //attach label.text value to this...

//Select all distinct values from table name.
$sql = "SELECT DISTINCT make FROM $table";

$result = mysqli_query($conn, $sql) or die ("Error in selecting" . mysqli_error($conn));

//create an array
$emparray = array();
while($row =mysqli_fetch_assoc($result))
{
$emparray[] = $row;
}

//echo json_encode($emparray); //TESTING.. implement to check response from query.

//Write to json file
    $fp = fopen('name.json', 'w');
    fwrite($fp, json_encode($emparray));
    fclose($fp);

// Close connection.
mysqli_close($conn);
?>
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