如何在Swift中表示MySQL位的類型3

-1

我的當前數據庫由位類型對象組成，以表示布爾變量。如何在Swift中表示MySQL位的類型3

但是，當我試圖從MySQL獲取這些數據到Swift 3時，它返回Nil。我知道我的PHP文件工作正常，因爲當我單獨運行我的PHP代碼時，它會打印出正確的一組值。

PHP文件

<?php 
session_start(); 
$current_username = $_SESSION["username"]; 
$current_password = $_SESSION["password"]; 

// open database 
$con = mysqli_connect("localhost","root","root","fridge_items"); 
$mysqli = new mysqli("localhost","root", "root", "fridge_items"); 

// Check connection 
if ($mysqli->connect_errno) { 
    echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
    exit(); 
} 
//Getting the user_id 
$query_id = "SELECT id FROM user WHERE username='$current_username'"; 
$result_id = $mysqli->query($query_id); 

/* associative array */ 
//Fetches the user id 
$row_id = $result_id->fetch_array(MYSQLI_ASSOC); 
$user_id = $row_id["id"]; 

//Fetches the user id 
$sql = "SELECT * FROM items where user_id='$user_id'"; 

// Check if there are results 
if ($result = mysqli_query($con, $sql)) { 
    // If so, then create a results array and a temporary one 
    // to hold the data 
    $resultArray = array(); 
    $tempArray = array(); 

    // Loop through each row in the result set 
    while($row = $result->fetch_object()) { 
     // Add each row into our results array 
     $tempArray = $row; 
     array_push($resultArray, $tempArray); 
    } 

    // Finally, encode the array to JSON and output the results 
    echo json_encode($resultArray); 
} 

//Close connections 
mysqli_close($con); 
?>

當我註釋掉狀態變量，它打印出正確的價值觀。所以我認爲它返回nil是因爲Bool不是在MySQL中表示Bit類型的正確方法。我試過Int，NSInteger，但都沒有工作。所以我真的不知道什麼類型實際代表狀態（位類型）。 Swift文件

/* 
* Fetching items from database 
*/ 
func fetchItems() -> Void { 

    let url: String = "http://localhost/fridge_app/fetchItems.php" //this will be changed to the path where service.php lives 

    //created NSURL 
    let requestURL = NSURL(string: url) 

    //creating NSMutableURLRequest 
    let request = URLRequest(url: requestURL! as URL) 

    //creating a task to send the post request 
    let task = URLSession.shared.dataTask(with: request as URLRequest) { 
     data, response, error in 

      //exiting if there is some error 
      if error != nil { 
       print("error is \(error)") 
       return; 
      } 

      // Grabbing the items 
      var jsonResult: NSMutableArray = NSMutableArray() 
      do { 
       jsonResult = try JSONSerialization.jsonObject(with: data!, options:JSONSerialization.ReadingOptions.mutableContainers) as! NSMutableArray 

      } catch let error as NSError { 
       print(error) 
      } 

      var jsonElement: NSDictionary = NSDictionary() 
      let items: NSMutableArray = NSMutableArray() 

      for i in 0 ... jsonResult.count-1 
      { 
       jsonElement = jsonResult[i] as! NSDictionary 
       let item = itemModel() 
       print(jsonElement["status"]) 

       //the following insures none of the JsonElement values are nil through optional binding 
       if let name = jsonElement["name"] as? String, 
        let status = jsonElement["status"] as? Bool 
        /*let date_in = jsonElement["date_in"] as? NSDate, 
        let count = jsonElement["count"] as? NSInteger, 
        let image = jsonElement["image"] as? NSObjectFileImage, 
        let expiration_date = jsonElement["expiration_date"] as? NSDate, 
        let item_id = jsonElement["item_id"] as? NSInteger*/ 
       { 
        item.name = name 
        item.status = status 
        /*item.date_in = date_in 
        item.count = count 
        item.image = image 
        item.expiration_date = expiration_date 
        item.item_id = item_id*/ 
       } 
       items.add(item) 
       print(item) 
      } 
     } 
     //executing the task 
     task.resume() 
    }

來源

2017-01-03 cruise_lab

PHP代碼是從數據庫讀取的，Swift是解析JSON的，它們不是等價的。你的問題可能來自json解釋，而不是來自數據庫的'Bit'值。 – Cristik

是的，我明白了，那麼我應該如何表示jsonElement [「狀態」]然後 –

然後請更新問題，然後在它的當前形式是誤導 – Cristik

-2

我找到了解決辦法。我沒有將狀態轉換爲特定的類型，而是將其設爲Any類型。如下所示。現在它的工作原理

var status: Any!

來源

2017-01-03 06:37:51

如何在Swift中表示MySQL位的類型3

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