Question

I’ve got a pretty standard call to a MySQL database and for some reason I can’t get the code to work. Here’s what I have:

$mysqli = mysqli_connect("localhost","username","password");
if (!$mysqli)
  {
  die('Could not connect: ' . mysqli_error($mysqli));
  }
session_start();
$sql = "SELECT * FROM jobs ORDER BY id DESC";
$result = $mysqli->query($sql);
$num_rows = mysqli_num_rows($result);

Now, first, I know that it is connecting properly because I’m not getting the die method plus I added an else conditional in there previously and it checked out. Then the page displays but I get the errors:

Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in blablabla/index.php on line 11

Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in blablabla/index.php on line 12

I’ve double-checked my database and there is a table called jobs with a row of “id” (it’s the primary row). The thing that confuses me is this is code that I literally copied and pasted from another site I built and for some reason the code doesn’t work on this one (I obviously copy and pasted it and then just changed the table name and rows accordingly).

I saw the error and tried:

$num_rows = $mysqli_result->num_rows;
$row_array = $mysqli_result->fetch_array;

and that fixed the errors but resulted in no data being passed (because obviously $mysqli_result has no value). I don’t know why the error is calling for that (is it a difference in version of MySQL or PHP from the other site)?

Can someone help me track down the problem? Thanks so much. Sorry if it’s something super simple that I’m overlooking, I’ve been at it for a while.

Answer 1

You didn’t selected the database

$mysqli = mysqli_connect("localhost","username","password","database");