我正在嘗試構建一個單擊按鈕,以增加數據庫中項目的值。我正在使用UPDATE方法。使用jquery和php在數據庫中手動增加字段
問題是,無論何時運行更新查詢,從數據庫到增量(或減量)所需的值都是零。 (0 + 1 = 1,0-1 = -1)
require_once("C:/xampp/htdocs/Selfie/database/dbcontroller.php");
$db_handle = new DBController();
$image_id = $_POST["image_id"];
$active_user_id = $_POST["active_user_id"];
$query = "SELECT user_image_id from users where user_id='" . $active_user_id . "'";
$result = mysql_query($query);
$row = mysql_fetch_assoc($result);
if ($row['user_image_id'] == $image_id) {
echo "own image";
}
else
{
$query = "SELECT image_id from hearts where user_id='" . $active_user_id . "'";
$result = mysql_query($query);
if ($row = mysql_fetch_assoc($result)) {
if ($row['image_id'] == $image_id) {
$query = "UPDATE images SET image_hearts='image_hearts'-1 where image_id=" . $image_id;
$result = mysql_query($query);
$query = "DELETE FROM hearts WHERE user_id=" . $active_user_id;
$result = mysql_query($query);
$query = "UPDATE users SET user_like ='' where user_id=" . $active_user_id;
$result = mysql_query($query);
echo "just unlike";
}
else
{
$query = "DELETE FROM hearts WHERE user_id=" . $active_user_id;
$result = mysql_query($query);
$query = "UPDATE images SET image_hearts='image_hearts'-1 where image_id=" . $row['user_image_id'];
$result = mysql_query($query);
$query = "Select image_path from images where image_id=" . $image_id;
$result = mysql_query($query);
$row = mysql_fetch_assoc($result);
$query = "UPDATE users SET user_like ='" . $row["image_path"] . " where user_id=" . $active_user_id;
$result = mysql_query($query);
$query = "UPDATE images SET image_hearts='image_hearts'+1 where image_id=" . $image_id;
$result = mysql_query($query);
$query = "INSERT INTO hearts (image_id , user_id) VALUES ('$image_id','$active_user_id')";
$result = mysql_query($query);
echo "unlike then like";
}
}
else
{
$query = "INSERT INTO hearts (image_id , user_id) VALUES ('$image_id','$active_user_id')";
$result = mysql_query($query);
$query = "UPDATE images SET image_hearts='image_hearts'+1 where image_id=" . $image_id;
$result = mysql_query($query);
$query = "Select image_path from images where image_id=" . $image_id;
$result = mysql_query($query);
$row = mysql_fetch_assoc($result);
$query = "UPDATE users SET user_like ='" . $row["image_path"] . "' where user_id=" . $active_user_id;
$result = mysql_query($query);
echo "image liked successfully.";
}
}
這是我的jQuery代碼:
function test_click(i_image_id, i_heart_id, i_active_user_id) {
var active_user_id = i_active_user_id;
var image_id = i_image_id;
var heart_id = i_heart_id;
jQuery.ajax({
url: "../Selfie/validations/add_like.php",
data: {
active_user_id: active_user_id,
image_id: image_id
},
type: "POST",
success: function(data) {
if (data == "own image")
{
alert('You are trying to like your own image You NARCISSIST');
}
else if (data == "just unlike")
{
$("*").removeClass("btn-heart-red animated bounce fa-heart-red");
alert('just unlike');
}
else
{
$("*").removeClass("btn-heart-red animated bounce fa-heart-red");
$("#" + heart_id).removeClass("animated rubberBand");
$("#" + heart_id).toggleClass("btn-heart-red animated bounce fa-heart-red");
}
alert(data);
}
});
}
請[停止使用'mysql_ *'函數](http:// stackov erflow.com/questions/12859942/why-shouldnt-i-use-mysql-functions-in-php)。 [這些擴展](http://php.net/manual/en/migration70.removed-exts-sapis.php)已在PHP 7中刪除。瞭解[編寫](http://en.wikipedia.org/ wiki/Prepared_statement)語句[PDO](http://php.net/manual/en/pdo.prepared-statements.php)和[MySQLi](http://php.net/manual/en/mysqli.quickstart .prepared-statements.php)並考慮使用PDO,[這真的很簡單](http://jayblanchard.net/demystifying_php_pdo.html)。 –
[您的腳本存在SQL注入攻擊風險。](http://stackoverflow.com/questions/60174/how-can-i-prevent-sql-injection-in-php) –
我會在之後解決這個問題。我正在爲另一個項目進行測試 –