PHP + MYSQL座位预约系统。 计算免费座位

Question

I have a table like this:

    $sql = "CREATE TABLE dramaStudio
   (
   rowId varchar(1) not null,
   columnId int not null,
   status int,
   firstName varchar(15) not null,
   lastName varchar(15) not null,
   updatedby varchar(10),
   PRIMARY KEY (rowId, columnId)
   )";

On the homepage of my website I would like the user to be able to see if there are any free seats without going on to the seating plan. Pretty much just a bit saying 'free seats:'followed by a number. My logic in pseudo code would be:

$j=0 
select * from dramaStudio
for every status == 0
    $j+1
echo $j

Any help will be greatly appreciated.

Answer 1

Assuming that status=0 if the free seat:

SELECT COUNT(*) AS freeseats FROM dramaStudio WHERE status=0

Full example, from php manual:

<?php
  $link = mysqli_connect("localhost", "my_user", "my_password", "world");

  /* check connection */
  if (mysqli_connect_errno()) {
      printf("Connect failed: %s
", mysqli_connect_error());
      exit();
  }

  $query = "SELECT COUNT(*) AS freeseats FROM dramaStudio WHERE status=0";
  $result = mysqli_query($link, $query);

  /* associative array */
  $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
  echo $row['freeseats']; // this is an integer

  /* free result set */
  mysqli_free_result($result);

  /* close connection */
  mysqli_close($link);
?>