Why I can't select a table existing in my database? - php

Question

EDIT
I connected to my database and I want to verify if I can select my table. They do exist but I always get "Unable to select (one of) the Databases"
if ($DBConnect === false) { //We verify if we are connected to the Database
echo "<p> Connection failed </p>\n";
} else {
//We want to check if there is the two table in the database
$sqlPat = "SELECT * FROM `tbl_patient`";
$sqlUser = "SELECT * FROM `tbl_user`";
$ResultPat = mysqli_query($DBConnect, $sqlPat);
$ResultUser = mysqli_query($DBConnect, $sqlUser);
if (empty($ResultPat) || empty($ResultUser)) {
echo "<p> Unable to select (one of) the Databases</p>";
} else {
$sqlTruncP = "TRUNCATE TABLE `tbl_patient`";
$sqlTruncU = "TRUNCATE TABLE `tbl_user`";
$QResultTP = mysqli_query($DBConnect, $sqlTruncP);
$QResultTU = mysqli_query($DBConnect, $sqlTruncU);
if ($QResultTP) {
echo "<p> Well done my mate ".$sqlTruncP. " done ". $DBConnect->info."</p>";
if ($QResultTU) {
echo "<p> Well done my mate ".$sqlTruncU. " done ". $DBConnect->info."</p>";
}
} else {
echo "<p> No Way Hose - Unable to perform SQL Truncate Table </p>";
}
}
I get 'No Way Hose - Unable to perform SQL Truncate Table' each time

Answer 1

$ResultPat and $ResultUser will return an array not string therefore you have to check with the method given below the array is empty or not.
if (empty($ResultPat) || empty($ResultUser)){
echo "<p> Unable to select (one of) the Databases</p>";
}
you can also check the values in the array but just using
echo "<pre>"print_r($ResultUser);die;
the above code will print your array elements and die will stop the code after your array will be printed on the screen.
Second Question Answer: -
if ($QResultTP)
{ echo " Well done my mate ";
echo " Well done my mate ";
}else
{
echo "<p> No Way Hose - Unable to perform SQL Truncate Table </p>";
}
explaination: -
In your 1st question query will return you an array it may be empty or can have data. empty used to check null,'',0, values in the variable.
they truncate query will not return you any data. it will just truncate the tables.