插入更新基于会话ID复制此查询

Question

我的系统让用户输入一个分数，然后通过此php将其添加到数据库中。仅在（当前）已经插入值的情况下才会更新-是否有办法使用此语法在重复项上插入插入更新，从而允许根据SESSION ID更新分数？

<?php
include("php/functions.php");
include('connections/conn.php');
$userID = $_SESSION["userID"];


//echo "all good here";



$newsselfesteemscore = mysqli_real_escape_string($conn, $_POST['selfesteemscore']);

/**$insertquery1 = "UPDATE selfesteemscore SET selestscore = '$newsselfesteemscore' , UserID = '$userID' ";**/

$insertquery1 = "UPDATE selfesteemscore SET selestscore = '$newsselfesteemscore' WHERE UserID = '$userID' ";

$result1 = mysqli_query($conn, $insertquery1) or die(mysqli_error($conn));

mysqli_close($conn);
?> 

尝试以下

$newsselfesteemscore = mysqli_real_escape_string($conn, $_POST['selfesteemscore']);


$insertquery1 = "INSERT INTO selfesteemscore(selestscore, UserID) VALUES('$newsselfesteemscore', '$userID')"
        . " ON DUPLICATE KEY UPDATE selfesteemscore SET selestscore = '$newsselfesteemscore' WHERE UserID = '$userID' "; 
var_dump(mysqli_error($conn));

$result1 = mysqli_query($conn, $insertquery1) or die(mysqli_error($conn));

mysqli_close($conn);
?> 

删除WHERE组件后出现的错误

string(0) "" You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET selestscore = '17' , UserID = '25'' at line 1

$insertquery1 = "INSERT INTO selfesteemscore(selestscore, UserID) VALUES('$newsselfesteemscore', '$userID')"
        . " ON DUPLICATE KEY UPDATE selfesteemscore(selestscore, UserID) VALUES ('$newsselfesteemscore' , UserID = '$userID') "; 
var_dump(mysqli_error($conn));

$result1 = mysqli_query($conn, $insertquery1) or die(mysqli_error($conn));

mysqli_close($conn);
?> 

string(0) "" You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(selestscore, UserID) VALUES ('17' , UserID = '25')' at line 1

Answer 1

The documentation为您提供INSERT .. ON DUPLICATE KEY UPDATE的语法。您的查询应如下所示：

$insertquery1 = "INSERT INTO selfesteemscore(selestscore, UserID) VALUES('$newsselfesteemscore', '$userID')"
        . " ON DUPLICATE KEY UPDATE selestscore = '$newsselfesteemscore', UserID = '$userID' "; 

但是，如果userID是唯一键，则不要更新它：

$insertquery1 = "INSERT INTO selfesteemscore(selestscore, UserID) VALUES('$newsselfesteemscore', '$userID')"
        . " ON DUPLICATE KEY UPDATE selestscore = '$newsselfesteemscore' ";