防止從一個php mysql數據庫反覆選擇相同的數據

Question

我的代碼應該從db中選擇數據，然後使用變量發送一條SMS。我正在使用cron作業來執行腳本。問題是，當cron運行時，它也會選擇已處理的數據。有人請指導我如何防止選擇已經處理的數據....

//should select the fresh or new data after the first run 
    $sql = "SELECT name, amount, trans_id, msisdn, time_paid FROM customer"; 


    $result1 = mysqli_query($conn, $sql); 
    $resultarr = mysqli_fetch_assoc($result1); // fetch data 


      $name = $resultarr['name']; 
      $amount = $resultarr['amount']; 
      $transaction_id = $resultarr['trans_id']; 
      $date = $resultarr['time_paid']; 

      //message template 
      $message = "Dear $name we have received $amount from you. MPESA transaction Id $transaction_id on $date."; 

     $mobilenumber = $resultarr['msisdn']; // get mobile number from array 
     $message_sent = $message; 

      $serviceArguments = array(
          "mobilenumber" => $mobilenumber, 
          "message" => $message_sent 
      ); 

      $client = new SoapClient("http://32.138.160.130:8080/smsengine/smsws?WSDL"); 

Answer 1

添加新的狀態的短信列。和sms_sent一樣，這個列的默認值是0，當sms發送成功時，將sms_sent的值0更改爲1。 然後sql查詢是： $ sql =「SELECT name，amount，trans_id，msisdn，time_paid FROM customer WHERE sms_sent = 0「;

---

//should select the fresh or new data after the first run 
    $sql = "SELECT id, name, amount, trans_id, msisdn, time_paid FROM customer"; 


    $result1 = mysqli_query($conn, $sql); 
    $resultarr = mysqli_fetch_assoc($result1); // fetch data 


      $name = $resultarr['name']; 
      $amount = $resultarr['amount']; 
      $transaction_id = $resultarr['trans_id']; 
      $date = $resultarr['time_paid']; 

      //message template 
      $message = "Dear $name we have received $amount from you. MPESA transaction Id $transaction_id on $date."; 

     $mobilenumber = $resultarr['msisdn']; // get mobile number from array 
     $message_sent = $message; 

      $serviceArguments = array(
          "mobilenumber" => $mobilenumber, 
          "message" => $message_sent 
      ); 

      $client = new SoapClient("http://32.138.160.130:8080/smsengine/smsws?WSDL"); 
$sq = "UPDATE customer SET notification = 1 WHERE id = $resultarr['id']";