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如果文本之间有一个引号，我的 php 表单提交给 mysql 不起作用

My php form submit to mysql doesn't work if there a single quotation in between text

本文关键字：表单提交 php mysql 不起作用 我的 之间 文本 有一个 如果 | 更新日期: 2024-06-14

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;

最后是我的网络.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();

因此，当我们放置 TAScode 和注释时，它应该更新注释表。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

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

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？您可以通过切换到预准备语句来使用 mysqli::real_escape_string 或更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，您应该真正使用 isset 或 empty 检查这些 POST 变量是否存在，否则如果不传递这些变量，您将收到错误。

使用 mysqli_real_escape_string() 

$comments = mysqli_real_escape_string($mysqli, $_POST['comments']);
$customerCode = mysqli_real_escape_string($mysqli, $_POST['customerCode']);
$query  = "INSERT INTO commentstable (customerCode, comments) VALUES ('$customerCode', '$comments');";
$web = mysqli_real_escape_string($mysqli, $_POST['web']);
$discount = mysqli_real_escape_string($mysqli, $_POST['discount']);
$query .= "UPDATE webdiscount SET web = ('$web'),discount=('$discount') where customerCode = ('$customerCode');";

使用mysqli_real_escape_string()阅读本文

所以代码将是 

$codebox=mysqli_real_escape_string($con, $_POST['customerCode']);

等。。。

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