php - 如果文本之间有单引号，我的 php 表单提交到 mysql 不起作用

Question

这是我的 html 页面:

<form method="post">
<input type="hidden" name="user" readonly="readonly" value="<?php echo $session->username;?>">
<input placeholder="TAS Code" class="input-text" type="text" name="customerCode" id="name" />
<textarea type="text" placeholder="Comments" style="width: 500px;" wrap="hard" class="input-text" name="comments" id="email"/></textarea>
<input type="submit" value="Submit" class="btn-u btn-u-small" name="submit" id="comment-submit" />
</form>

这是在提交时运行 web.php 的 Java 脚本

$(document).ready(function() {
$('form').submit(function(msg) {  
    $.post("web.php",$(this).serialize(),function(data){       
    });
    $( 'form' ).each(function(){
this.reset();
});
return false;

最后是我的 web.php 来处理表单内容。

$mysqli =mysqli_connect("localhost","pf_sales","pfsal3s","pf_sales");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
$webbox = $_POST['web'];
 $codebox=$_POST['customerCode'];
 $commentbox=$_POST['comments'];
 $discount=$_POST['discount'];
 $task=$_POST['taskbox'];
 $clear=$_POST['clearbox'];
  $user=$_POST['user'];


if ($codebox !="" && $commentbox !="" && $webbox!="" && $discount!="")
{
$query  = "INSERT INTO commentstable (customerCode, comments) VALUES ('$_POST[customerCode]', '$_POST[comments]');";
$query .= "UPDATE webdiscount SET web = ('$_POST[web]'),discount=('$_POST[discount]') where customerCode = ('$_POST[customerCode]');";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());
}

/* close connection */
 $mysqli->close();
}
if ($codebox !="" && $commentbox !="" && $webbox!="")
{
$query  = "INSERT INTO commentstable (customerCode, comments) VALUES ('$_POST[customerCode]', '$_POST[comments]');";
$query .= "UPDATE webdiscount SET web = ('$_POST[web]') where customerCode = ('$_POST[customerCode]');";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());
}

/* close connection */
 $mysqli->close();
}
if ($codebox !="" && $commentbox !="" && $task!="")
{
$query  = "INSERT INTO commentstable (customerCode, comments) VALUES ('$_POST[customerCode]', '$_POST[comments]');";
$query .= "UPDATE webdiscount SET taskFor=('$_POST[taskbox]') where customerCode = ('$_POST[customerCode]');";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());
}

/* close connection */
 $mysqli->close();
}
else if ($codebox!="" && $commentbox!="" && $user!="")
 {
    $query ="INSERT INTO commentstable (user, customerCode, comments) VALUES ('$_POST[user]', '$_POST[customerCode]', '$_POST[comments]');";
    if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());

}
 $mysqli->close();
 }

 else if ($codebox!="" && $webbox!="" )
 {
    $query ="UPDATE webdiscount SET web = ('$_POST[web]') where customerCode = ('$_POST[customerCode]');";
    if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());

}
 $mysqli->close();
 }
 else if ($codebox!="" && $discount!="" )
 {
    $query ="UPDATE webdiscount SET discount=('$_POST[discount]') where customerCode = ('$_POST[customerCode]'); ";
    if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());

}
 $mysqli->close();
 }
else if ($codebox !="" && $task!="")
{

$query = "UPDATE webdiscount SET taskFor=('$_POST[taskbox]') where customerCode = ('$_POST[customerCode]');";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());
}

/* close connection */
 $mysqli->close();
}
else if ($codebox !="" && $clear=="done")
{

$query = "UPDATE webdiscount SET taskFor='' where customerCode = ('$_POST[customerCode]');";

/* execute multi query */
if ($mysqli->multi_query($query)) {
    do {
        /* store first result set */
        if ($result = $mysqli->store_result()) {
            while ($row = $result->fetch_row()) {
                printf("%s\n", $row[0]);
            }
            $result->free();
        }
        /* print divider */
        if ($mysqli->more_results()) {
            printf("-----------------\n");
        }
    } while ($mysqli->next_result());
}

/* close connection */
 $mysqli->close();

所以当我们放置 TAScode 和评论时，它应该更新评论表。只要我们不在文本中使用单引号 '，它就可以正常工作。即，如果我们写“我们没有这样做”，那么表单不会更新数据库。

任何帮助将不胜感激。谢谢

Answer 1

问题是因为您将未转义的单引号传递给您的 SQL 查询。例如，如果 $_POST['customerCode'] 包含 We didn't do this 您的查询将如下所示:

INSERT INTO commentstable (customerCode, comments) VALUES ('We didn't do this', '…')

您看到破坏 SQL 语句的额外引号了吗？您可以通过使用 mysqli::real_escape_string 或更好的方法，通过切换到准备好的语句来防止这种情况。您的查询将如下所示:

$query = "INSERT INTO commentstable (customerCode, comments) VALUES (?, ?)";
$stmt = $mysqli->prepare($query);
$stmt->bind_param('is', $_POST['customerCode'], $_POST['comments']);
$stmt->execute();

顺便说一句，您真的应该使用 isset 或 empty 检查这些 POST 变量是否存在，否则如果未通过，您将收到错误消息。