php - 通过 php/mysql 从表中读取变量

Question

我从手机中插入玩家的姓名和评级。这部分正在发挥作用。但之后我想取回一个名为player_id的变量的int值，它是主键。

所以首先我执行插入查询，插入数据。完成此操作后，我运行一个选择查询来获取用户插入的行的player_id。这是代码。

<?php
require "init.php";
header('Content-type: application/json');

$id_isSet = isset($_POST['player_id']);
$user_id_isSet = isset($_POST['User_Id']);
$best_player_isSet = isset($_POST['player']);
$rate_isSet = isset($_POST['rating']);

if ($id_isSet && $user_id_isSet && $best_player_isSet && $rate_isSet) {

    $id = $_POST['player_id'];
    $user_id = $_POST['User_Id'];
    $best_player = $_POST['player'];
    $rate = $_POST['rating'];

    $sql_query = "INSERT INTO rating_players_table    
    VALUES('$id','$best_player','$rate','$user_id');";

    if (mysqli_query($con, $sql_query)) {

        $query = "select * from rating_players_table  LIMIT 1";

        $result = mysqli_query($con, query);

        $row = mysqli_fetch_array($result);

        if ($row) {

            $post_id = $row['player_id'];
            $don = array('result' => 'success', 'message' => $post_id);
        } else {

            $don = array('result' => 'fail', 'message' => 'player was not found');
        }
    }
} else if (!$best_player) {

    $don = array('result' => "fail", "message" => "Insert player name");
} else if (!$rate) {

    $don = array('result' => "fail", "message" => "Rate player");
}

echo json_encode($don);
?>

我得到了这个回复。

{"result":"fail","message":"player was not found"}

所以，即使我可以通过我的 Android 手机添加数据，选择查询也不起作用:(。有什么想法为什么会发生这种情况吗？我从来没有玩过那么深的 php/mysql。但我已经到了那里，我想一想。

谢谢

西奥。

编辑

<?php
 require "init.php";
 header('Content-type: application/json');

$id_isSet = isset($_POST['player_id']);
$user_id_isSet = isset($_POST['User_Id']);
$best_player_isSet = isset($_POST['player']);
$rate_isSet = isset($_POST['rating']);

if($id_isSet && $user_id_isSet && $best_player_isSet && $rate_isSet){

$id = $_POST['player_id'];
$user_id = $_POST['User_Id'];
$best_player = $_POST['player'];
$rate = $_POST['rating'];

$sql_query = "INSERT INTO rating_players_table    
VALUES('$id','$best_player','$rate','$user_id');";

if(mysqli_query($con,$sql_query)){

    mysqli_insert_id($con);

    $don = array('result' =>"success","message"=>"Έγινε");
 }       
 }else if(!$best_player){

    $don = array('result' =>"fail","message"=>"Insert player name");

 }else if(!$rate){

    $don = array('result' =>"fail","message"=>"Rate player");

}

  $query = "select player from rating_players_table where player_id ='".mysqli_real_escape_string($con, $id)."' LIMIT 1";       

            $result = mysqli_query($con,query);

            $row = mysqli_fetch_array($result);

            if($row){

                $post_id = $row['player_id'];
                mysqli_insert_id($post_id);
                $don = array('result' =>'success','message'=>$post_id);

            }else{

                $don = array('result' =>'fail','message'=>'player was not      
  found');
            }
  echo json_encode($don);

?>

Answer 1

您可以在插入查询语句之后使用此mysqli_insert_id($con);。