php怎么把获得的$md5file值更新到数据down的md5字段

Question

我的数据表down有三个字段id,fileurl,md5,我现在从数据表取得文件的地址，然后测md5值，然后把md5值 更新到md5字段里面
===========================

<?php
$servername = "localhost";
$username = "root";
$password = "123456"; //mysql密码
$dbname = "test"; //选择数据库
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM down"; //sql查询语句
$result = $conn->query($sql); //获得查询结果
if ($result->num_rows > 0) {
// 输出每行数据
while ($row = $result->fetch_assoc()) {
if ($row["md5"] == null) {
$filename = $row["fileurl"];
$md5file = md5_file($filename);
/*

$sql = "update down set md5 = '$md5file' where id = '$row[id]"; //sql查询语句

mysql_query($sql,$conn);
*/

echo "<li>" . $row["id"] . " - FileUrl: " . $row["fileurl"] . "-MD5:" . $md5file."</li>";

} else{

echo "<li>" . $row["id"] . " - FileUrl: " . $row["fileurl"] . "-MD5:" . "已经存在"."</li>";
}
}
} else {
echo "0 results";
}
$conn->close();
?>

Answer 1

md5的值是个varchar类型吧，你的update语句要更新的值应该拼接个引号，希望对你有帮助