为什么 php mysql update 返回成功但从未更新该列？

Question

my basic goal is to update a single row and if it is successful it will insert some data in different table.

here is my query

$upd = mysql_query("UPDATE request_tbl SET status='1' WHERE sender='$user_id' AND reciever='$id'", $con);

if($upd){
    $result = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES ('$user_id', '$id')", $con);
    $result2 = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES ('$id', '$user_id')", $con);
    
    if($result && $result2){
        $jsonresult = $myFunctions->jsonRequest("Sent Request");
    }
    else{
        $jsonresult = $myFunctions->jsonRequest("Failed Request");
    
    }

}

note: the scenario is i am updating data to the webserver using android app,

when i try to test the query from using this.

http://----/-----.php?req=accept&user-id=5&id=1

i get a success message and updates, and insert the data in the database. However when i try to send the request from the app it returns a success message and inserts the data, that means that the update was successful but in the database it was never update.

i also tried to change the data type of the column status to int or varchar but still with the same effect, it is weird the insert was excuted but the update was never happened or it was?

EDIT ! ! ! i did try all the recommended solutions like mysql_affected_rows() > 0 and echoing the query but with no luck.. as everyone recommends/insits :) i will try to convert the query into PDO or mysqli thanks for the help everyone.

**EDIT 2 ! ! ! **

i tried to to convert my queries to PDO here is my code

    $upd = $con->prepare("UPDATE request_tbl SET `status`='1' WHERE `sender`='$user_id' AND `reciever`='$id' AND `status`='0'");

try{
    $upd->execute();
    $result = $con->prepare("INSERT INTO contact_tbl (id, friend_id) VALUES (?, ?)");
    $result->bindParam(1, $user_id);
    $result->bindParam(2, $id);
    $result2 = $con->prepare("INSERT INTO contact_tbl (id, friend_id) VALUES (?, ?)");
    $result2->bindParam(1, $id);
    $result2->bindParam(2, $user_id);
    
    try{
        $result->execute();
        $result2->execute();
        $jsonresult = $myFunctions->jsonRequest("Sent Request");
    }
    catch(PDOException $e){
        $jsonresult = $myFunctions->jsonRequest("Failed Request");
    }
}
catch(PDOException $e){
    $jsonresult = $myFunctions->jsonRequest("Failed Request");
}

echo $jsonresult;

but i recieve the same result, whenever i try it using the url method the update and insert are successful with the correct value, but when i do it with the app the update and insert returns successful and the insert have the correct value but the update did not change the column im changing..

Answer 1

use mysql_affected_rows() to check how many rows were affected. Try this,

if(mysql_affected_rows()){
    // your stuff here.
}

Answer 2

Make sure that values of $user_id and $id getting on the current page you are in.

Hopefully, you passed the user id variable as user-id and retrieved as $_GET['user-id'] .

If its perfect then, echo both queries and run the printed query on phpmyadmin manually. That will through the erroe

echo $result = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES ('$user_id', '$id')", $con);
echo $result2 = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES ('$id', '$user_id')", $con);

more over mysql_query has been deprecated. Those functions will be no more exist. Try PDO or MySQLi

Answer 3

try this folk, use mysql_num_rows(). mysql_affected_rows() give you a nums of rows afected by the last query executed. and you know how manny rows are afected. Hope this can help you

$upd = mysql_query("UPDATE request_tbl SET status='1' WHERE    sender='$user_id' AND reciever='$id'", $con);

$NumsRowsAfected = mysql_affected_rows();

    if(mysql_affected_rows() > 0){
       $result = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES     ('$user_id', '$id')", $con);
       $result2 = mysql_query("INSERT INTO contact_tbl (id, friend_id) VALUES ('$id', '$user_id')", $con);

       if($result && $result2){
         $jsonresult = $myFunctions->jsonRequest("Sent Request");
       }
       else{
         $jsonresult = $myFunctions->jsonRequest("Failed Request");

       }
    }