准备好的语句与绑定变量不匹配，即使它匹配？

Question

据我所知，我从表中选择了 6 列，并绑定了 6 个变量，为什么它告诉我它不匹配？

这是一个评分脚本，人们可以在其中投票给汽车。

此脚本适用于插入/选择/联合，但我注意到当人们从文件夹结构中对图像进行投票时，一切都变得非常缓慢，因此我想将选定的图像移动到另一个文件夹，以便更快地访问它们，但是我在尝试绑定结果时似乎遇到了问题。这对我来说通常不是问题。

有人可以向我解释为什么在这种特殊情况下会发生这种情况吗？

更新：

我忘了包含类别变量 抱歉，它们是在刚刚定义的脚本中的真实脚本中......那么为什么所有的反对票？我告诉过你 SQL 的工作原理——我只是想改进它。

$cat1 = 1;
$cat2 = 2:
$cat3 = 3;
$stmt = $dbCon->prepare(" INSERT INTO cars_daily ( cars_daily_identifier, cars_daily_source, cars_daily_views, cars_daily_votes, cars_daily_rating, cars_daily_category) "
        . " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
        . " FROM cars_bcar "
        . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) "
        . " UNION "
        . " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
        . " FROM cars_car "
        . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) "
        . " UNION "
        . " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
        . " FROM cars_car "
        . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) ");
$stmt->bind_param('iii', $cat1, $cat2, $cat3);
if ($stmt->execute()) {
    echo "<br><br>";
    echo "Success SELECT/INSERT";
    echo "<br><br>";
} else {
    echo "<br><br>";
    print_r($stmt->error);
    echo "<br><br>";
    echo "Fail SELECT/INSERT";
}

        $stmt->bind_result($cars_car_id, $cars_cars_source, $cars_car_views, $cars_car_votes, $cars_car_rating, $cars_car_category);
        while ($stmt->fetch()) {

            copy("models/$cars_cars_source", "daily/$cars_cars_source");
        }

Answer 1

原因

即使要插入的值来自 SELECT 语句，INSERT 查询也不会产生记录（就像 SELECT 那样）。

解决方案

一种选择是运行 INSERT 查询，然后运行单独的 SELECT 以获取插入的值。

$selectSQL = " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
    . " FROM cars_bcar "
    . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) "
    . " UNION "
    . " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
    . " FROM cars_car "
    . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) "
    . " UNION "
    . " (SELECT cars_car_id, cars_car_source, cars_car_views, cars_car_votes, cars_car_rating, cars_car_category "
    . " FROM cars_car "
    . " WHERE cars_car_category IN (?) ORDER BY RAND() LIMIT 5) ";
//run the INSERT statement
$stmt = $dbCon->prepare(" INSERT INTO cars_daily ( cars_daily_identifier, cars_daily_source, cars_daily_views, cars_daily_votes, cars_daily_rating, cars_daily_category) " . $selectSQL);
$stmt->bind_param('iii', $cat1, $cat2, $cat3);
if ($stmt->execute()) {
    echo "<br><br>";
    echo "Success SELECT/INSERT";
    echo "<br><br>";
} else {
    echo "<br><br>";
    print_r($stmt->error);
    echo "<br><br>";
    echo "Fail SELECT/INSERT";
}
$stmt->close(); //close the prepared statement
//run the SELECT statement
$stmt = $dbCon->prepare($selectSQL);
$stmt->bind_param('iii', $cat1, $cat2, $cat3);
$stmt->execute()
$stmt->bind_result($cars_car_id, $cars_cars_source, $cars_car_views, $cars_car_votes, $cars_car_rating, $cars_car_category);
    
    .