试图编写一个php mysql连接和查询。它提供了一个错误“注意:使用未定义的常量购买 - 假设'购买'”尝试反引号没有解决。有人能告诉我需要改正的地方吗?带连字符的php代码字段名称
<?php
$host="localhost";
$port=3306;
$socket="";
$user="xxxx";
$password="xxxx";
$dbname="amazon";
$con = new mysqli($host, $user, $password, $dbname, $port, $socket)
or die ('Could not connect to the database server' . mysqli_connect_error());
$query = "SELECT SUM(`quantity-purchased`), DATE(`purchase-date`),Tally_SKU FROM daily_orders GROUP BY DATE(daily_orders.`purchase-date`),Tally_SKU";
if ($stmt = $con->prepare($query)) {
$stmt->execute();
$stmt->bind_result($quantity-purchased, $purchase-date, $Tally_SKU);
while ($stmt->fetch()) {
//printf("%s, %s, %s\n", $quantity-purchased, $purchase-date, $Tally_SKU);
}
$stmt->close();
}
//$con->close();
?>
请您指导我如何到这儿来。改变列名是不可能的。任何其他出路 – Kanted
@Kanted:你应该只改变'$ stmt-> bind_result($ quantity-purchased,$ purchase-date,$ Tally_SKU)行中的变量名称;'' – AnkiiG