No Database Selected in Num_Rows - php

Question

Got a strange error saying that I'm not connected to a database while running a mysqli_num_rows query. Here is the code:
<?php include("php/functions.php"); ?>
<?php
if(isset($_GET['verification']) && !empty($_GET['verification'])){
// Verify data
$hash = mysqli_real_escape_string($con, $_GET['verification']); // Set hash variable
$search_sql = "SELECT 'hash', active FROM members WHERE hash='".$verification."' AND active='0'";
$search_res = mysqli_query($con, $search_sql);
$match = mysqli_num_rows($search_res);
Any ideas why this isn't working?

Answer 1

I have changed several things in your code, please review.
If you are using the mysqli class then anything after your class instatiation should look something like:
$con = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
$con->exampleClassFunction()
using the object operator ->.
To get the num_rows your object operator would be after the query variable, like so:
$search_res = $con->mysqli_query($con, $search_sql);
$match = $search_res->mysqli_num_rows($search_res);
I also added the backticks to all applicable column names in your query:
SELECT `hash`, `active` FROM members WHERE `hash`='".$verification."' AND `active`='0'
Here is an example with your code:
//include("php/functions.php");
$DB_NAME = 'DATABASE_NAME';
$DB_HOST = 'DATABASE_HOST';
$DB_USER = 'DATABASE_USER';
$DB_PASS = 'DATABASE_PASSWORD';
$con = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
// Added a connection error check before continuing
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if(isset($_GET['verification']) && !empty($_GET['verification'])){
$hash = $con->mysqli_real_escape_string($con, $_GET['verification']);
// Use back ticks on query column names,
// use single quotes for comparative operations
$search_sql = "SELECT `hash`, `active` FROM members WHERE `hash` = '".$verification."' AND `active` = '0'";
$search_res = $con->mysqli_query($con, $search_sql);
$match = $search_res->mysqli_num_rows($search_res);
}

Answer 2

<?php include('functions.php'); ?>
Also, make sure you have your closing ?> tag in the correct place.

Answer 3

just try to make it include("functions.php")..
I think thats your problem

Answer 4

<?php
include("functions.php"); //includes databse connection
$search_sql = "SELECT hash, active FROM members WHERE hash='".$verification."' AND active='0'";
$search_res = mysqli_query($con, $search_sql);
$match = mysqli_num_rows($search_res);
?>
include("functions"); or include("functions.php"); ??? You forgot .php

Answer 5

You forget to add file extension.
<?php include("functions.php"); ?>
also put `
around hash as its reserved word by MySQL.

Answer 6

please try the below code:
<?php
include("functions.php"); //includes databse connection php file
$search_sql = "SELECT hash, active FROM members WHERE hash='".$verification."' AND active='0'";
$search_res = mysqli_query($con, $search_sql);
$match = mysqli_num_rows($search_res);
?>
include should have a .php file as parameter. please check it.