Having Issue On MySQLi LOAD DATA INFILE to Load .CSV File - php

Question

I am trying to load a 40 mg .CSV file into MYSQL database using MySQLi and PHP but I am getting only The user update failed: message (Witdout Error Message!) after loading the page
<?PHP
define ( 'DB_HOST', 'localhost' );
define ( 'DB_USER', 'root' );
define ( 'DB_PASS', '' );
define ( 'DB_NAME', 'map' );
$con = new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
};
$sql = "LOAD DATA INFILE 'C:/wamp/www/UP/Modified_Single.csv'
INTO TABLE `single-tbl`
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '\"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES;";
$result = mysqli_query($con, $sql);
if (mysqli_affected_rows($con) == 1) {
$message = "The data was successfully added!";
} else {
$message = "The user update failed: ";
$message .= mysqli_error($con);
};
echo $message;
mysqli_close($con);
Can you please let me know why this is happening?

Answer 1

Your test for success is wrong. mysqli_affected_rows() returns the number of rows that were inserted into the table, which should be the same as the number of lines in the CSV file. I doubt a 40-meg file is only 1 line, so testing this for == 1 is wrong.
If you want to know if the query was successful, test $result.
if ($result) {
$message = "The data was successfully added!";
} else {
$message = "The user update failed: " . mysqli_error($con);
}