这里我有一些存储在表中的值：
| points_id || user_id(fk) || point_hist |
|___________||_____________||____________|
| 1 || 10 || 100 |
|___________||_____________||____________|
| 2 || 11 || 30 |
|___________||_____________||____________|
| 3 || 12 || 70 |
|___________||_____________||____________|
| 4 || 13 || 200 |
如果用户获得了100 points，并且他们已经拥有100 points，例如points_id 1。
我需要一个查询，将他们的奖励100添加到他们当前的100分= 200分。
这是我的PHP：
<?php
// see if the form has been completed
include_once("php_includes/check_login_status.php");
$username = "";
$weight = "";
$height = "";
$weighthist = "";
$id = "";
if(isset($_GET["u"])){
$username = preg_replace('#[^a-z0-9]#i', '', $_GET['u']);
}
//$user_query=mysqli_query($db_conx,"SELECT * FROM users,points_history"); /* WHAT'S THE PURPOSE OF VARIABLE $username? */
$user_query=mysqli_query($db_conx,"SELECT * FROM users WHERE username='$username' AND activated='1' LIMIT 1");
/* check if the user exists in the database */
while ($row = mysqli_fetch_array($user_query)) {
$id = $row ["id"];
$username = $row ["username"];
$weight = $row["weight"];
$points = $row['point_hist'];
} /* END OF WHILE LOOP $user_query */
$q12 = mysqli_query($db_conx,"SELECT * FROM points_history WHERE id='$id'");
/* check if the user exists in the database */
while ($row = mysqli_fetch_array($q12)) {
$id = $row ["id"];
$points = $row['point_hist'];
} /* END OF WHILE LOOP $user_query */
if (isset($_POST['submit'])){
$id = $_POST["id"];
$username = $_POST['username'];
$weight = $_POST['weight'];
$weighthist = $_POST['weighthist'];
$point_hist = $_POST['point_hist'];
$exists=mysqli_query($db_conx,"SELECT * FROM users WHERE username='$username'");
if (mysqli_num_rows($exists)!=0) {
/* update the description in the database */
/* calculate score */
$calweight = $weight - $weighthist;
$point_hist = $calweight * 10 + $points;
mysqli_query($db_conx,"INSERT INTO weighthistory (id, weighthist, date) VALUES ('$id','$weighthist',now())");
// mysqli_query ($db_conx,"INSERT INTO points_history (id, point_hist, date) VALUES ('$id','$point_hist',now())");
/* UPDATE QUERY */
// Update weight in the users table.
mysqli_query($db_conx,"UPDATE users SET weight='$weighthist' WHERE id='$id'");
mysqli_query($db_conx,"UPDATE points_history SET point_hist='$point_hist' WHERE id='$id'");
/* END OF UPDATE QUERY */
} /* END OF ELSE IF $exists NOT 0 */
else { echo "the name does not exist"; }
} /* END OF ISSET SUBMIT */
?>
答案 0 :(得分：0)
您已将 MySQL 与 MySQLi 混合在一起。让我们将它们转换为 MySQLi 。让我尝试清理代码以便更好地理解。
让我们假设您的 check_login_status.php 如下所示：
<?php
$db_conx=mysqli_connect("studentnet","k1003140","iphone09","db_k1003140"); /* REPLACE THE NECESSARY HOST, USERNAME, PASSWORD, AND DATABASE */
if(mysqli_connect_errno()){
echo "Error".mysqli_connect_error();
}
?>
您的主要代码：
<?php
include("php_includes/check_login_status.php");
if(isset($_GET["u"])){
$username = preg_replace('#[^a-z0-9]#i', '', $_GET['u']);
}
$username = "";
$user_query=mysqli_query($db_conx,"SELECT * FROM users WHERE username='$username' AND activated='1' LIMIT 1"); /* WHAT'S THE PURPOSE OF VARIABLE $username? */
/* check if the user exists in the database */
while ($row = mysqli_fetch_array($user_query)) {
$id = $row ["id"];
$username = $row ["username"];
$weight = $row["weight"];
$email = $row["email"];
} /* END OF WHILE LOOP $user_query */
if (isset($_POST['submit'])){
$id = $_POST["id"];
$username = $_POST['username'];
$weight = $_POST['weight'];
$weighthist = $_POST['weighthist'];
$point_hist = $_POST['point_hist'];
$exists=mysqli_query($db_conx,"SELECT * FROM users WHERE username='$username'");
if (mysqli_num_rows($exists)!=0) {
/* update the description in the database */
/* calculate score */
$calweight = $weight - $weighthist;
$point_hist = $calweight * 10;
mysqli_query($db_conx,"INSERT INTO weighthistory (id, weighthist, date) VALUES ('$id','$weighthist',now())");
mysqli_query ($db_conx,"INSERT INTO points_history (id, point_hist, date) VALUES ('$id','$point_hist',now())");
/* UPDATE QUERY */
mysqli_query($db_conx,"UPDATE points_history SET point_hist='$TheUpdatedValue' WHERE id='$id'");
/* END OF UPDATE QUERY */
} /* END OF ELSE IF $exists NOT 0 */
else { echo "the name does not exist"; }
} /* END OF ISSET SUBMIT */
?>
我认为你没有给出完整的代码。我只是将您的代码从混合 MySQL 和 MySQLi 转换为 MySQLi 仅。