How can I update the date cancellation in usr table IOM

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  Hello

  right now I am doing my project for the online election system using dreamweaver cc14. I create a table using php code to bind the data to mysql, and in this painting, I create also a button "vote" for voters to vote. My question is, how can I update my polling data in the mysql database when voters push button "vote" based on the id of the candidates? Here is my code I try:

  <form method="post" id="form1">
        <?php
  $servername = "localhost";
  $username = "root";
  $password = "pass";
  $dbname = "ses";
  
  
  // Create connection
  $conn = new mysqli($servername, $username, $password, $dbname);
  // Check connection
  if ($conn->connect_error) {
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  $sql = "SELECT No, Calon, ID, Jurusan, Image FROM candidates";
  $result = $conn->query($sql);
  
  
  if ($result->num_rows > 0) {
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    <tr>
    <th>NO</th>
    <th>Candidate</th>
    <th>INFO</th>
    <th>Vote</th>
    </tr>";
       // output data of each row
       while($row = $result->fetch_assoc()) {
           echo "<tr>
    <td>" . $row["No"]. "</td>
    <td><img src=" . $row['Image'] . "></td>
    <td><br/>-" . $row["Calon"]. " <br/>-" . $row["ID"]. " <br/>-" . $row["Jurusan"]. "<br/></td>
    <td><input type="."submit"." name=".$row["Calon"]." id=".$row["No"]. " value="."Vote"."></td>
  
    </tr>";
    if(isset($_POST["".$row['No'].""])){
  
    $vote_sachin = "UPDATE candidates SET Undi=Undi+1 WHERE No=".$row["No"]. "";
  
    $run_sachin = mysqli_query($conn, $vote_sachin);
  
  
  }
      }
    echo "</table>";
  } else {
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  }
  
  
  
  
  
  
  $conn->close();
  ?>
  
  
  
  
      </form>
  

  I hope someone can help me in this area, because I'm still new in this programming language.

  Thank you.

  Youre probably going to insert a 'radio button' next to the names of candidates and recover the database ID of that (I guess that the ID is the primary key in your database that uniquely identifies each record.

  His great confusion because you seem to update the database to aid WHERE no = "." $row ["no"]. so I don't know that ID is the primary key?

  IF "No" IS your master database key, you need to change the code below:

  TO:

  Here's the complete code based on the ID of your primary database key.

  <>

  $servername = "localhost";

  $username = 'root ';

  $password = "pass";

  $dbname = 'his ';

  Create the connection

  $conn = new mysqli ($dbname, $servername, $username, $password);

  Check the connection

  If {($conn-> connect_error)

  Die ("connection failed:".) $conn-> connect_error);

  }

  $sql = "SELECT No, Calon, ID, Jurusan, Image OF candidates";

  $result = $conn-> Query;

  If you click on the button "vote" form run the code to update the database below

  {if (isset($_POST['vote']))}

  Get the value of the ID of the radio button form field and store it in a table.

  $update_vote = $_POST ['candidate_id'];

  loop in the table and update the database

  foreach ($update_vote as $value) {}

  $vote_sachin = ' candidates UPDATE SET Undi = Undi + 1 WHERE ID = ".". " $value. » « ;"

  $run_sachin = mysqli_query ($conn, $vote_sachin);

  }

  }

  ?>

  <>

  If ($result-> num_rows > 0) {}

  ECHO '.

  ";

  each line output

  While ($row = {$result-> fetch_assoc())}

  ECHO '.

  ";

  }

  ECHO '.

  ";

  ECHO '.

  NO.	Candidate	INFO	To the vote
  " . $row ["no"]. "		-" . $row ["Calon"]. " -" . $row ['ID']. " -" . $row ["Jurusan"]. "

  ";

  } else {}

  echo "0 results."

  }

  $conn-> close();

  ?>

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