<?php
include('session.php');
?>
<?php
$conn = new mysqli("127.0.0.1","root","","foo");
if ($conn->connect_errno) {
echo "Failed to connect to MySQL: (" . $conn->connect_errno . ") " . $conn->connect_error;
}
$sew = $_SESSION['login_user'];
$a = $_GET["en"];
$l = 1;
$d = -1;
if($a == 1)
{
$sqlw = " INSERT into dlkeuser VALUES('$a','$sew')" ;
if ($conn->query($sqlw) === FALSE)
{
echo "you have already disliked the song";
}
else
{
//query1
$sql = " DELETE FROM lkeuser WHERE userid = '$sew' AND songid = '$a' ";
//query2
$sql = "UPDATE liking
SET count = count - 1 ";
if ($conn->query($sql) === TRUE) {
echo "you disliked the song";
}
else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
}
在这个php代码片段中，query1不起作用，而查询2没问题。
我试图在dlkeuser(dislike)表中针对用户i / p（$_GET["en"]）插入（songid，userid）并从lkeuser(like)表中删除记录（songid，userid）存在。 （songid，userid）对是这里的复合主键。 count是一首歌的喜欢/不喜欢。
答案 0 :(得分：0)
在重用$ sql变量之前，需要执行query1。
n答案 1 :(得分：0)
您没有在任何地方执行query1。以下代码不会执行您的查询
$sql = " DELETE FROM lkeuser WHERE userid = '$sew' AND songid = '$a' " ;
您需要另一行，如下所示（就像您对query2所做的那样）
if ($conn->query($sql) === TRUE) {
echo "you liked the song";
}
else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
执行查询并检查错误。
答案 2 :(得分：0)
让我们试试这个，
它会起作用
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