500 error php mysqli cannot update or edit simple table

webdevdea · November 5, 2013

Here is the link so you can try it yourself and see

here is my model.php file


<?php
        /*
                Allows the user to both create new model and edit existing model
        */

        // connect to the database
        include("connectme.php");

        // creates the new/edit record form
        // since this form is used multiple times in this file, I have made it a function that is easily reusable
        function renderForm($first = '', $address ='', $phone = '', $error = '', $id = '')
        { ?>
                <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
                <html>
                        <head>  
                        	
                                <title>
                                        <?php if ($id != '') { echo "Edit Record"; } else { echo "New Record"; } ?>
                                </title>
                                <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
                                <link rel="stylesheet" type="text/css" href="Styles.css" />
                        </head>
                        <body>
                                <h1><?php if ($id != '') { echo "Edit Record"; } else { echo "New Record"; } ?></h1>
                                <?php if ($error != '') {
                                        echo "<div style='padding:4px; border:1px solid pink; color:pink'>" . $error
                                                . "</div>";
                                } ?>
                                
                                <form action="" method="post">
                                <div>
                                        <?php if ($id != '') { ?>
                                                <input type="hidden" name="id" value="<?php echo $id; ?>" />
                                                <p>ID: <?php echo $id; ?></p>
                                        <?php } ?>
                                        
                                        
                                      <strong>Name: *</strong><input type="text" name="firstname"
                                                value="<?php echo $first; ?>"/><br/>
                                        <strong>Address: *</strong> <input type="text" name="addressname"
                                                value="<?php echo $address; ?>"/>
                                         <strong>Phone: </strong> <input type="text" name="phone"
                                                value="<?php echo $phone; ?>"/>
                                        <p>* required</p>
                                        <input type="submit" name="submit" value="Submit" />
                                </div>
                                </form>
                        </body>
                </html>
                
        <?php }



        /*

           EDIT RECORD

        */
        // if the 'id' variable is set in the URL, we know that we need to edit a record
        if (isset($_GET['id']))
        {
                // if the form's submit button is clicked, we need to process the form
                if (isset($_POST['submit']))
                {
                        // make sure the 'id' in the URL is valid
                        if (is_numeric($_POST['id']))
                        {
                                // get variables from the URL/form
                                //ENT_QUOTES - Decodes double and single quotes
                                $id = $_POST['id'];
                                $firstname = htmlentities($_POST['firstname'], ENT_QUOTES);
                                $addressname = htmlentities($_POST['addressname'], ENT_QUOTES);
                                $phone = htmlentities($_POST['phone'], ENT_QUOTES);
                                
                                // check that firstname and addressname are both not empty
                                if ($firstname == '' || $addressname == '')
                                {
                                        // if they are empty, show an error message and display the form
                                        $error = 'ERROR: Please fill in all required fields!';
                                        renderForm($firstname, $addressname, $phone, $error, $id);
                                }
                                else
                                {
                                        // if everything is fine, update the record in the database
                                        // bind statement string, string, string, integer
                                        if ($stmt = $mysqli->prepare("UPDATE players SET firstname = ?, addressname = ?, phone = ?
                                                WHERE id=?"))
                                        {
                                                $stmt->bind_param("sssi", $firstname, $addressname, $phone, $id);
                                                $stmt->execute();
                                                $stmt->close();
                                        }
                                        // show an error message if the query has an error
                                        else
                                        {
                                                echo "ERROR: could not prepare SQL statement.";
                                        }
                                        
                                        // redirect the user once the form is updated
                                        header("Location: dandewebwonders.com/view.php");
                                }
                        }
                        // if the 'id' variable is not valid, show an error message
                        else
                        {
                                echo "Error!";
                        }
                }
                // if the form hasn't been submitted yet, get the info from the database and show the form
                else
                {
                        // make sure the 'id' value is valid
                        if (is_numeric($_GET['id']) && $_GET['id'] > 0)
                        {
                                // get 'id' from URL
                                $id = $_GET['id'];
                                
                                // get the recod from the database
                                if($stmt = $mysqli->prepare("SELECT * FROM players WHERE id=?"))
                                {
                                        $stmt->bind_param("i", $id);
                                        $stmt->execute();
                                        
                                        $stmt->bind_result($id, $firstname, $addressname, $phone);
                                        $stmt->fetch();
                                        
                                        // show the form
                                        renderForm($firstname, $addressname, $phone, NULL, $id);
                                        
                                        $stmt->close();
                                }
                                // show an error if the query has an error
                                else
                                {
                                        echo "Error: could not prepare SQL statement";
                                }
                        }
                        // if the 'id' value is not valid, redirect the user back to the view.php page
                        else
                        {
                                header("Location: view.php");
                        }
                }
        }



        /*

           NEW RECORD

        */
        // if the 'id' variable is not set in the URL, we must be creating a new record
        else
        {
                // if the form's submit button is clicked, we need to process the form
                if (isset($_POST['submit']))
                {
                        // get the form data
                        $firstname = htmlentities($_POST['firstname'], ENT_QUOTES);
                        $addressname = htmlentities($_POST['addressname'], ENT_QUOTES);
                        $phone = htmlentities($_POST['phone'], ENT_QUOTES);
                        
                        // check that firstname and addressname are both not empty
                        if ($firstname == '' || $addressname == '')
                        {
                                // if they are empty, show an error message and display the form
                                $error = 'ERROR: Please fill in all required fields!';
                                renderForm($firstname, $addressname, $phone, $error);
                        }
                        else
                        {
                                // insert the new record into the database
                                if ($stmt = $mysqli->prepare("INSERT players (firstname, addressname, phone) VALUES (?, ?, ?)"))
                                {
                                        $stmt->bind_param("sss", $firstname, $addressname, $phone);
                                        $stmt->execute();
                                        $stmt->close();
                                }
                                // show an error if the query has an error
                                else
                                {
                                        echo "ERROR: Could not prepare SQL statement.";
                                }
                                
                                // redirec the user
                                header("Location: view.php");
                        }
                        
                }
                // if the form hasn't been submitted yet, show the form
                else
                {
                        renderForm();
                }
        }
        
        // close the mysqli connection
        $mysqli->close();
?>

Ch0cu3r · November 5, 2013

Have you fixed this? I do not get a 500 Error when I add/edit/delete records.

When you get a 500 Internal Server Error check your servers error log to see why you are getting this error.

webdevdea · November 5, 2013

OK I checked the log, Its like a foreign language,

[05-Nov-2013 06:10:58] PHP Fatal error: Call to a member function query() on a non-object in /home3/aundie/public_html/dandewebwonders.com/project/viewpatient.php on line 18

Here is the code for viewpatient.php… I got this to work on my school server but I cannot get it to work on my own… SMDH

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
        <head>  
                <title>My Patients</title>
                <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        </head>
        <body>
                
                <h1>My Patients</h1>
                
                <p><b>View  All Patients</b> </p>
                
                <?php
                        // connect to the database
                        include('connectme.php');
                        
                        // get the records from the database
                        if ($result = $mysqli->query("SELECT * FROM patient ORDER BY patientId"))
                        {
                                // display records if there are records to display
                                if ($result->num_rows > 0)
                                {
                                        // display records in a table
                                        echo "<table border='1' cellpadding='10'>";
                                        
                                        // set table headers
                                        echo "<tr><th>Patient ID</th> <th>InfantId</th> <th>RoomNumber</th> <th>FirstName</th> <th>LastName</th> <th>Address</th> <th>Phone</th> <th>Emergency Contact</th> <th></th> <th></th> </tr>";
                                        
                                        while ($row = $result->fetch_object())
                                        {
                                                // set up a row for each record
                                                echo "<tr>";
                                                echo "<td>" . $row->patientId . "</td>";
                                                echo "<td>" . $row->infantPatientid . "</td>";
                                                echo "<td>" . $row->roomNumberid . "</td>";
                                                echo "<td>" . $row->patientFirstname . "</td>";
                                                echo "<td>" . $row->patientLastname . "</td>";
                                                echo "<td>" . $row->patientAddress . "</td>";
                                                echo "<td>" . $row->patientPhone . "</td>";
                                                echo "<td>" . $row->patientEmergencycontact . "</td>";
                                                
                                                
                                                echo "<td><a href='project/model.php?patientiId=" . $row->patientId . "'>Edit</a></td>";
                                                echo "<td><a href='project/deletepatient.php?patientId=" . $row->patientId . "'>Delete</a></td>";
                                                echo "</tr>";
                                        }
                                        
                                        echo "</table>";
                                }
                                // if there are no records in the database, display an alert message
                                else
                                {
                                        echo "No results to display!";
                                }
                        }
                        // show an error if there is an issue with the database query
                        else
                        {
                                echo "Error: " . $mysqli->error;
                        }
                        
                        // close database connection
                        $mysqli->close();
                
                ?>
                
                <a href="project/model.php">Add New Patient Record</a>
        </body>
</html>

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500 error php mysqli cannot update or edit simple table

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