MySQL在PHPmyadmin上的终端中工作，但在php脚本中不工作？

Question

Title pretty much explains it here is what I have tried this is my little test script to check if the mysql query works

$servername = "HIDDEN";
$username = "HIDDEN";
$password = "HIDDEN";
$dbname = "fbaFees";
/////////////////////////////////////

$conn = mysqli_connect($servername, $username, $password, $dbname);

if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
echo "Connected to database successfully<br><br>";

$sqlcheck = "SELECT * FROM fbafee_table WHERE ASIN = 'B07GC6DXFQ' ORDER BY ID DESC LIMIT 1 OFFSET 1;"; 

if ($conn->query($sqlcheck) === TRUE) {

    echo "New record created successfully<br>";
} else {
    echo "Error: " . $sqlcheck . "<br>" . $conn->error;
}

This script gives me this error:

Error: SELECT * FROM fbafee_table WHERE ASIN = 'B07GC6DXFQ' ORDER BY ID DESC 
LIMIT 1;

This is the mysql query that works on phpmyadmin

Error: SELECT * FROM fbafee_table WHERE ASIN = 'B07GC6DXFQ' ORDER BY ID DESC 
LIMIT 1;

Any help is greatly appreciated!

edit:

Answer 1

Try changing the code with the following:

$query = "SELECT * FROM fbafee_table WHERE ASIN = 'B07GC6DXFQ' ORDER BY ID DESC LIMIT 1 OFFSET 1;"; 
$result = $conn->query($query);
if ($result && $result->num_rows>0) {
    while($row = $result->fetch_assoc()) {
         // do stuff with your row data
         echo $row['COLUMN_NAME'];   
    }
}
else
{
    echo "Error: " . mysqli_error($conn) . "<br>" . $query;
}

The SELECT query selects data from the database, so if you check if the result is strictly equal to TRUE , the result is not. You need to cycle the results. If there's no rows returned, then you display the error using mysqli_error($conn) .

Answer 2

Well the $conn->query method will return a result set when it finds are record not the boolean TRUE. It returns the boolean false if there is no result found. So you have to slightly change your code first to check for unavailability and then the availability as follows

if (!$conn->query($sqlcheck)) {

   echo "Error: " . $sqlcheck . "<br>" . $conn->error;

} else {

   echo "New record created successfully<br>";
}