PHP和mySQL“ UPDATE”實際上並未更新

Question

因此，我和我的朋友得出了一個結論，那就是$ _email變量使一切搞砸了。 只要它是硬編碼的，它就可以工作。 但是，一旦到處都留下$ _email，它就不會。 該消息顯示為“已更新”，但未更新。

require_once('appVars6.php');
require_once('connectVars6.php');
$_dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
$_id = $_GET['id'];
$_queryOne = "SELECT * FROM midterm WHERE id = '$_id'";
$_resultOne = mysqli_query($_dbc, $_queryOne) or die ('Error Querying Database');
while ($_row = mysqli_fetch_array($_resultOne)) {
echo '<form class="update" method="post" action="MT_vjones_udpateRecord.php?id=' . $_id . '">';
echo '<input type="hidden" name="id" id="id" value="' . $_row['id'] . '" />';
echo '<input type="text" name="firstName" id="firstName" value="' . $_row['firstName'] . '" /><br />';
echo '<input type="text" name="lastName" id="lastName" value="' . $_row['lastName'] . '" /><br />';
echo '<input type="text" name="email" id="email" value="' . $_row['email'] . '" /><br />';
echo '</form>';
}
if ( isset($_GET['firstName']) && isset($_GET['lastName']) && isset($_GET['email'])) {
$_id = $_GET['id'];
$_firstName = $_GET['firstName'];
$_lastName = $_GET['lastName'];
$_email = $_GET['email'];   
}
else if ( isset($_POST['firstName']) && isset($_POST['lastName']) && isset($_POST['email'])) {
$_id = $_POST['id'];
$_firstName = mysqli_real_escape_string($_dbc, trim($_POST['firstName']));
$_lastName = mysqli_real_escape_string($_dbc, trim($_POST['lastName']));
$_email = mysqli_real_escape_string($_dbc, trim($_POST['email']));
}
else {
echo '<br />';
echo '<p class="error">Sorry, no record was selected.</p>';
}
if(isset($_POST['submit'])) {
if ($_POST['confirm'] == 'Yes') {
//$_dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
$_query = "UPDATE midterm " .
"SET email = '$_email'" .
"WHERE id = $_id" ;
$_result = mysqli_query($_dbc, $_query) or die (mysqli_error($_dbc));
mysqli_close($_dbc);
echo '<p>The record of ' . $_firstName . ' ' . $_lastName . ' for ' . $_email . ' was successfully updated.';
}
else {
echo '<p class="error">The record was not updated.</p>';
}
}
else if (isset($_id) && isset($_firstName) && isset($_lastName) && isset($_email)) {
echo '<p>Are you sure you want to update the following record?</p>';
/*echo '<form class="update" method="post" action="MT_vjones_updateRecord.php">';
echo '<input type="text" name="firstName" id="firstName" value="' . $_firstName . '" /><br />';
echo '<input type="text" name="lastName" id="lastName" value="' . $_lastName . '" /><br />';
echo '<input type="text" name="email" id="email" value="' . $_email . '" /><br />';
echo '</form>';*/
echo '<form class="update" method="post" action="MT_vjones_updateRecord.php?id=' . $_id . '">';
echo '<div class="yesNo"><input class="radio" type="radio" name="confirm" value="Yes" /> Yes </div><br />';
echo '<div class="yesNo"><input class="radio" type="radio" name="confirm" value="No" checked="checked" /> No </div><br /><br />';
echo '<input class="applyBtn" type="submit" value="UPDATE" name="submit" />';
echo '<input type="hidden" name="id" value="' . $_id . '" />';
echo '<input type="hidden" name="firstName" value="' . $_firstName . '" />';
echo '<input type="hidden" name="lastName" value="' . $_lastName . '" />';
echo '<input type="hidden" name="email" value="*testBACK2FUN@test.com*" />';
}
echo '<p><a href="MT_vjones_adminAccess.php">&lt;&lt; Back to the Admin Page</a></p>';

如您所見，我們在此處放置了電子郵件地址以進行測試...

Answer 1

  $_query = "UPDATE midterm " .
            "SET email = '$_email' WHERE id = '$_id'" ;

應該

$_query = "UPDATE midterm " .
          "SET email = $_email".
          "WHERE id = $_id " ;

Answer 2

檢查ID是否與您打算更新的ID相符。 確保在更新之前和之后打印$ _id和$ _email。

@ user710502：您不需要在PHP中用雙引號分隔引號。 無論如何，它都會讀取它，只有您從數組中讀取時，您才可能會感到煩惱，例如：

"UPATE midterm SET email='".$POST['email']."'"

Answer 3

原因是您在變量前使用$_ ，該變量不是有效的變量聲明。

因為$_為php中的SUPER GLOBAL保留(ie $_SESSION,$_SERVER,$_POST,$_GET,$_COOKIE etc) 。

如果這對您來說不是問題，則需要按如下所示連接變量。

$_query = "UPDATE midterm SET email = '".$_email."' WHERE id = '".$_id."'" ;

Answer 4

解決了！ 形式問題。

應該：

<?php
require_once('appVars6.php');
require_once('connectVars6.php');

$_dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

$_id = $_GET['id'];
$_queryOne = "SELECT * FROM midterm WHERE id = '$_id'";
$_resultOne = mysqli_query($_dbc, $_queryOne) or die ('Error Querying Database');

while ($_row = mysqli_fetch_array($_resultOne)) {
    echo '<form class="update" method="post" action="MT_vjones_udpateRecord.php?id=' . $_id . '">';
    echo '<input type="hidden" name="id" id="id" value="' . $_row['id'] . '" />';
    echo '<input type="hidden" name="firstName" id="firstName" value="' . $_row['firstName'] . '" />';
    echo '<input type="hidden" name="lastName" id="lastName" value="' . $_row['lastName'] . '" />';
    echo '<input type="hidden" name="email" id="email" value="' . $_row['email'] . '" />';
    echo '</form>';
}

if ( isset($_GET['firstName']) && isset($_GET['lastName']) && isset($_GET['email'])) {
    $_id = $_GET['id'];
    $_firstName = $_GET['firstName'];
    $_lastName = $_GET['lastName'];
    $_email = $_GET['email'];   
}

    else if ( isset($_POST['firstName']) && isset($_POST['lastName']) && isset($_POST['email'])) {
        $_id = $_POST['id'];
        $_firstName = mysqli_real_escape_string($_dbc, trim($_POST['firstName']));
        $_lastName = mysqli_real_escape_string($_dbc, trim($_POST['lastName']));
        $_email = mysqli_real_escape_string($_dbc, trim($_POST['email']));
    }

        else {
                echo '<br />';
                echo '<p class="error">Sorry, no record was selected.</p>';
        }

if(isset($_POST['submit'])) {
    if ($_POST['confirm'] == 'Yes') {

    $_query = "UPDATE midterm " .
                "SET email = '$_email'" .
                "WHERE id = $_id" ;

    $_result = mysqli_query($_dbc, $_query) or die (mysqli_error($_dbc));

    mysqli_close($_dbc);
    echo '<p>The record of ' . $_firstName . ' ' . $_lastName . ' for ' . $_email . ' was successfully updated.';
    }

        else {
            echo '<p class="error">The record was not updated.</p>';
        }
}

    else if (isset($_id) && isset($_firstName) && isset($_lastName) && isset($_email)) {
        echo '<p>Are you sure you want to update the following record?</p>';
        echo '<form class="update" method="post" action="MT_vjones_updateRecord.php?id=' . $_id . '">';
        echo '<div class="yesNo"><input class="radio" type="radio" name="confirm" value="Yes" /> Yes </div><br />';
        echo '<div class="yesNo"><input class="radio" type="radio" name="confirm" value="No" checked="checked" /> No </div><br /><br />';
        echo '<input type="hidden" name="id" value="' . $_id . '" />';
        echo '<input type="text" name="firstName" value="' . $_firstName . '" /><br />';
        echo '<input type="text" name="lastName" value="' . $_lastName . '" /><br />';
        echo '<input type="text" name="email" value="' . $_email . '" />';
        echo '<input class="applyBtn" type="submit" value="UPDATE" name="submit" />';
    }

echo '<p><a href="MT_vjones_adminAccess.php">&lt;&lt; Back to the Admin Page</a></p>';
?>