dtng25909
2019-07-13 16:09 阅读 162
已采纳

遇到mysqli_query问题,返回NULL但查询在phpmyadmin中有效

I'm tring to retrive information from a database while a user send Login command from iOS app. To test this function i'm launching my php page manually (ex. http://www.testdatabase.com/LoginFunctions.php) and forcing username programmatically.

The problem is that mysqli_query return NULL value. if i use "or die(mysql_error()" nothing happens. Even if i use mysqli_num_rows return 1, but $result is still empty. So when mysql_fetch_assoc is been executed the programm crashes without showing any error. Any idea? Thanks

<?php
    // Create connection
    $con=mysqli_connect("localhost","super","super","testdb");

    // Check connection
    if (mysqli_connect_errno())
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    $action = "login";
    $username = "Peperoncino";
    $response = array();

    if ($action == "login")
    {
        $query = "SELECT psw AS pswrd,id FROM Activities WHERE nome = 'Peperoncino' LIMIT 1";

        if ($result = mysqli_query($con, $query))
        {
            $values = mysql_fetch_assoc($result);
            $password = $values['pswrd'];
            $response["password"] = $password;
            $response["message"] = "Get information from db";
        }
        else
        {
            echo "err";
        }

        echo json_encode($response);
    }

    // Close connections
    mysqli_close($con);
?>
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1条回答 默认 最新

  • 已采纳
    dousaoxiancy199896 dousaoxiancy199896 2019-07-13 16:21

    You are using the deprecated mysql_fetch function.Use the new one

    <?php
        // Create connection
        $con=mysqli_connect("localhost","super","super","testdb");
    
        // Check connection
        if (mysqli_connect_errno())
        {
            echo "Failed to connect to MySQL: " . mysqli_connect_error();
        }
    
        $action = "login";
        $username = "Peperoncino";
        $response = array();
    
        if ($action == "login")
        {
            $query = "SELECT psw AS pswrd,id FROM Activities WHERE nome = 'Peperoncino' LIMIT 1";
    
            if ($result = mysqli_query($con, $query))
            {
                $values = mysqli_fetch_assoc($result);
                $password = $values['pswrd'];
                $response["password"] = $password;
                $response["message"] = "Get information from db";
            }
            else
            {
                echo  mysqli_error($conn);  
            }
    
            echo json_encode($response);
        }
    
        // Close connections
        mysqli_close($con);
    ?>
    
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