Cannot select inserted data [closed] - php

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I made a new table , everything worked.
CREATE TABLE IF NOT EXISTS logdata (
email varchar(30),
password varchar(20),
username varchar(15),)
Inserted the id auto increment code
,and some data :
INSERT INTO logdata(email,password,username,id) VALUES('test#test.org','testtest1','test',' ')
Everything worked here. When I try to output the data i dont get any results (except "ERROR"). I have no idea why.
<?php
error_reporting(E_ALL);
// here is where I set the connection , everything is working here
if(mysqli_connect_errno()){
echo "Could not connect to the database <br /><br />";
echo mysqli_connect_error();
exit();
}
$dostuff="SELECT * FROM logdata";
$query = mysqli_query($db_conn, $dostuff);
if($query == TRUE) {
echo "Succes!";
}
else{
echo "ERROR ";
echo mysqli_error($db_conn);
}
?>

Answer 1

In order to query something in your database, you have to provide a query to it. Your query variable is an empty string!!
$dostuff="";
It should have some SQL statements, like e.g:
$dostuff="SELECT * FROM logdata";
Or whatever.
UPDATE
I believe that using === to test the result will fail because the mysqli_query returns a mysql_result object, according to the docs:
Returns FALSE on failure. For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. For other successful queries mysqli_query() will return TRUE.
So if its succeful it won't be === TURE for your SELECT statement and it will have no error. Your query is fine, just try this:
if ($query = mysqli_query($db_conn, $dostuff)) {
echo "Success!";
}
else {
echo "ERROR ";
echo mysqli_error($db_conn);
}
It should works.