mysqli_query is returning false - php

Question

I am just trying to output the 'cat_find' table to check if my insert statement is correct but mysqli_query is return false. Also if my insert statement is wrong i would like some help with that also:
<?php
$asin = $_POST['asin'];
include("aws_signed_request.php");
echo "You have entered: " . $asin;
$servername = "servername";
$username = "username";
$password = "password";
$database = "database";
$conn = mysqli_connect($servername, $username, $password, $database);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
else{
echo "<br/>";
echo "CONNECTION SUCCESSFUL!";
echo "<br/>";
}
/*$sql = "CREATE TABLE cat_find (
id INT(100) NOT NULL AUTO_INCREMENT PRIMARY KEY,
amazon TEXT(100) NOT NULL,
new_egg TEXT(100) NOT NULL,
ebay TEXT(100) NOT NULL
)";*/
$excel = file_get_contents("skufile.csv");
$explode = explode(',', $excel);
/*for($i = 0; $i<count($explode); $i = $i+3){
//echo $explode[$i];
//echo $explode[$j];
//echo $explode[$k];
$j = $i+1;
$k = $i + 2;
$insert = "INSERT INTO cat_find (amazon, new_egg, ebay) VALUES ('$explode[$i]','$explode[$j]','$explode[$k]')";
}*/
$strSQL = "SELECT * FROM cat_find";
$rs = mysqli_query($conn,$strSQL);
while($row = mysqli_fetch_array($rs)){
echo $row['amazon'] . "<br />";
echo $row['new_egg'] . "<br />";
echo $row['ebay'] . "<br />";
}
// echo $value[0];
$public_key = "PUBLIC-KEY";
$private_key = "PRIVATE-KEY";
$associate_tag = "ASSOC-TAG";
$request = aws_signed_request('com', array('Operation' => 'ItemLookup','ItemId' => $asin, 'ResponseGroup' => 'Large'), $public_key,
$private_key, $associate_tag);
$response = #file_get_contents($request);
if ($response === FALSE) {
echo "Request failed.<br>";
}
else {
// parse XML
echo '<pre>';
$pxml = simplexml_load_string($response);
//var_dump($pxml);
echo $pxml;
echo "<h3>Category/Product Group:</h3> ";
echo $pxml -> Items -> Item -> ItemAttributes -> ProductGroup;
echo "<br/><br/>";
$asin_cat = $pxml -> Items -> Item -> ItemAttributes -> ProductGroup;
}
$sel = "SELECT * FROM cat_find WHERE amazon = '$asin_cat'";
$run = mysqli_query($conn,$sel);
if($run){
echo "Your ASIN has matched an Amazon asin. Here are the Amazon, New Egg and Ebay categories.";
echo "Amazon Category: " . $run[0] . "<br/> <br/>";
echo "New Egg Category: " . $run[1] . "<br/> <br/>";
echo "ebay Category: " . $run[2] . "<br/> <br/>";
}
else{
echo "Your ASIN did not match any ASIN in the Amazon library. try again.";
}
?>
help would be appreciated