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我有一个简单的 php 文件,可以将 id 和时间添加到数据库中。如果“id”与数据库中已有的 id 相同,我如何将其更改为仅更新“时间”,如果 id 尚未在数据库中,则照常添加两者?我遇到了'INSERT... ON DUPLICATE KEY UPDATE' 语法,但不能完全正确地实现它。任何帮助,将不胜感激。谢谢!

<?php

$host="localhost";
$username="*****";
$password="*****";
$db_name="*****";

$id = htmlspecialchars($_GET["id"]);
$time = intval(htmlspecialchars($_GET["time"]));

echo $id;
echo $time;

$data = array("id" => $id, "time" => $time);

var_dump($data);

$mysqli = new mysqli($host, $username, $password, $db_name);

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$stmt = $mysqli->prepare("INSERT INTO testdata (id, time) VALUES (?, ?)");

if($stmt === FALSE)
    die("Prepare failed... ");// Handle Error Here

    // the types of the data we are about to insert: s = string, i = int
    $stmt->bind_param('si', $data['id'], $data['time']);    
    $stmt->execute();

$stmt->close();

// close the connection to the database
$mysqli->close();

?>
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1 回答 1

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您应该执行以下操作:

INSERT INTO testdata (id,time) VALUES(?,?) 
   ON DUPLICATE KEY UPDATE time=values(time)

但正如@Mike W 在评论中所说,确保 ID 是主键或唯一索引。文档中的更多信息

于 2013-10-20T20:58:41.233 回答