代码如下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><?php require_once 'header.php'; require_once 'check.php';?><meta content="en-us" http-equiv="Content-Language" /><meta content="text/html; charset=utf-8" http-equiv="Content-Type" /><title>Item Detail</title><style type="text/css">.auto-style2 { text-align: center;}.auto-style1 { font-size: 36pt; text-align: left; font-family: Default;}.auto-style3 { font-family: Broadway;}</style></head><body><?php if(isset($_POST['submit_edit_item_id'])) { $_SESSION['eidt_item_id'] = $_POST['sub_edit_item_id']; } $item_id = $_SESSION['eidt_item_id']; $result = mysql_query("SELECT * FROM ITEM WHERE ITEM_ID = $item_id"); if($result) { $row = mysql_fetch_array($result); $user_id = $_SESSION['id']; $name = $row['NAME']; $dsc = $row['DESCRIPTION']; $auc = $row['RESERVE_PRICE']; $bin = $row['BIN_PRICE']; $btime = $row['BEGIN']; $etime = $row['END']; $status = $row['STATUS']; $seller = $row['SELLER_ID']; $winner = $row['WINNER_ID']; $curr_bid = $row['CURR_BID']; $num_bid = $row['NUM_BID']; $img_id = $row['IMG_ID']; } $result = mysql_query("SELECT USER_NAME FROM USER WHERE USER_ID = $seller"); if($result) { $row = mysql_fetch_array($result); $seller_name = $row['USER_NAME']; }?> <table align="center" style="width: 100%"> <tr> <td> <div class="auto-style2"> <table align="center" style="width: 100%"> <tr> <td class="auto-style1">Edit item:</td> <td> <a href="http://acadweb1.salisbury.edu/~rwan/home.php"> <img src="/static/imghwm/default1.png" data-src="logo.jpg" class="lazy" style="max-width:90%" style="float: right" style="max-width:90%" / alt="请大侠们帮我看看这个问题出在哪？" ></a></td> </tr> </table> </div> <hr /> <table style="width: 100%"> <tr> <td rowspan="2"> <?php display_image($img_id, 500, 400); ?> <form action="edit_item.php" method="post" enctype="multipart/form-data"> <table><tr><td><input type="file" name="image" /></td></tr> <tr><td><input name="sub_change_pic" type="submit" value="Change picture"> <input name="sub_del_pic" type="submit" value="Delete picture"></td></tr> </table></form> <?php if(isset($_POST['sub_change_pic'])) { if(isset($_FILES['image'])) { $file = $_FILES['image']['tmp_name']; if(!empty($file)) { $image = addslashes(file_get_contents($file)); $image_name = addslashes($_FILES['image']['name']); $image_size = getimagesize($file); if($image_size == false) { print'<p class = "error">The file is not an image.</p>'; } else { mysql_query("LOCK TABLES IMAGES WRITE"); mysql_query("LOCK TABLES ITEM WRITE"); if($img_id == 1) { mysql_query("INSERT INTO IMAGES (IMG_NAME, IMG) VALUES ('$image_name', '$image')"); $pic_id = mysql_insert_id(); mysql_query("UPDATE ITEM SET IMG_ID = $pic_id WHERE ITEM_ID = $item_id"); } else { mysql_query("UPDATE IMAGES SET IMG_NAME = '$image_name', IMG = '$image' WHERE IMG_ID = $img_id"); } mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } } } } if(isset($_POST['sub_del_pic'])) { echo "delete click"; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET IMG_ID = 1 WHERE ITEM_ID = $item_id"); if($img_id != 1) { mysql_query("LOCK TABLES IMAGES WRITE"); mysql_query("DELETE FROM IMAGES WHERE IMG_ID = $img_id"); } mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </td> <td><form action="edit_item.php" method="post"> <textarea cols="50" name="title" rows="4"><?php print $name; ?></textarea><br> <input name="change_item_title" type="submit" value="Change item title" /></form></td> </tr> <tr> <td><hr /> <?php if(isset($_POST['change_item_title'])) { $name = $_POST['title']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET NAME = '$name' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } if($status == "SOLD") { $result = mysql_query("SELECT * FROM ITEM_SOLD WHERE ITEM_ID = $item_id"); $row = mysql_fetch_array($result); $buyer = $row['BUYER_ID']; if($_SESSION['id'] == $buyer) { print'<p class = "error">Congratulations! The item is yours.</p>'; } else { print'<p class = "error">Sorry, the item has been sold!</p>'; } } else if($status == "NA") { print'<p class = "error">Item is not available yet!</p>'; } else if($status == "EXPIRE") { print'<p class = "error">Item is expired.</p>'; } else { date_default_timezone_set('America/New_York'); $curr_date = date("Y-m-d"); $curr_time = date("H:i"); $curr_datetime = "$curr_date $curr_time:00"; print"<p><strong>Current datetime: $curr_datetime</strong></p>"; $result = mysql_query("SELECT * FROM ITEM WHERE ITEM_ID = $item_id"); if($result) { $row = mysql_fetch_array($result); $btime = strtotime($row['BEGIN']); $etime = strtotime($row['END']); $date = date("Y-m-d", $etime); $time = date("H:i", $etime); } print'<table><tr><td><form action="edit_item.php" method="post"> Change End time:</td></tr><tr><td><input type="date" name="end_date" value='.$date.'> <input type="time" name="end_time" value='.$time.'></td> <td><input type="submit" name= "go" value="Set Time"> </form></td></tr></table>'; if($_POST['go'] == "Set Time") { $end_date = $_POST['end_date']; $end_time = $_POST['end_time']; $end_time = $end_time.':00'; $end_datetime = strtotime("$end_date $end_time"); $now = strtotime($default_datetime); $problem = false; if ($end_datetime <= $now) { print'You cannot set End time earlier than current time!'; $problem = true; } if(!$problem) { mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET END = '$end_date $end_time' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } } refresh(); } ?> <hr /><br /> <table><tr><td>Buy it Now Price:</td></tr> <tr><td><form action ="edit_item.php" method="post"> <input name="price" type="text" value="<?php print $bin; ?>" ></td></tr> <tr><td><input name="sub_change_price" type="submit" value="Change price" /></form></td></tr></table> <?php if(isset($_POST['sub_change_price'])) { $price = $_POST['price']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET BIN_PRICE = $price WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </td> </tr> <tr> <td class="auto-style3" colspan="2"> <form action ="edit_item.php" method="post"> <textarea cols="80" name="description" rows="10"><?php print $dsc; ?></textarea><br> <input name="change_dsc" type="submit" value="Change item description" /></form></td> </tr> <?php if(isset($_POST['change_dsc'])) { $dsc = $_POST['description']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET DESCRIPTION = '$dsc' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </table> </td> </tr> </table> </body><?php require_once 'webmaster.php'; ?></html> 我不想误导大家， 但我自己的分析，认为问题出在 94-149行之间的这段php代码上。
IMAGES的表里存储的是BLOB图片，IMG_ID我设置的是自动增长的，IMG_ID为1的图片是默认的错误信息图。
每当我插入一张新的图片，名为IMAGES里面会有新的图片插入，并自动生成IMG_ID，ITEM里面的IMG_ID无法自动更新(详情见121行）， 135-147行代码也是相同的问题，如果成功删除图片，无法将IMG_ID改回1。
我已经做了实验，print $item_id的值，发现$item_id的值是没有问题的。另外table的拼写也无错误。。。
难道是什么地方不小心把table lock了，而且没有unlock？可是即使lock了，我自己应该还是有权限修改的不是吗？小弟百思不得其解
麻烦各位大神帮小弟分析一下原因，小弟感激不尽
回复讨论(解决方案)
自增长id应该是不会回退的吧？
自增长id应该是不会回退的吧？
谢谢你。可以解释的详细点吗？ 问题该怎么解决呢？
$pic_id = mysql_insert_id();
mysql_query("UPDATE ITEM SET IMG_ID = $pic_id WHERE ITEM_ID = $item_id");
既然 IMG_ID 是自动增长的， 那么 IMG_ID 就是主键了
主键是不可重复的！
SET IMG_ID = $pic_id 就有重复的嫌疑
至少在你的代码中没有看到对 ITEM_ID 赋值的代码
而有
$item_id = $_SESSION['eidt_item_id'];
但是也没有看到 session_start();
虽说 ITEM_ID 可能有初值，但 $item_id 为空的话将造成 SQL 指令为
UPDATE ITEM SET IMG_ID = nnnn WHERE ITEM_ID =
显然是错误的
估计是列名弄混了
斑竹 火眼金睛~
$pic_id = mysql_insert_id();
mysql_query("UPDATE ITEM SET IMG_ID = $pic_id WHERE ITEM_ID = $item_id");
既然 IMG_ID 是自动增长的， 那么 IMG_ID 就是主键了
主键是不可重复的！
SET IMG_ID = $pic_id 就有重复的嫌疑
至少在你的代码中没有看到对 ITEM_ID 赋值的代码
而有
$item_id = $_SESSION['eidt_item_id'];
但是也没有看到 session_start();
虽说 ITEM_ID 可能有初值，但 $item_id 为空的话将造成 SQL 指令为
UPDATE ITEM SET IMG_ID = nnnn WHERE ITEM_ID =
显然是错误的
估计是列名弄混了
谢谢版主大神
我解释一下我的构思
因为我想换了图片以后，立即显示出来，所以加了以下语句
header("location: " . $_SERVER['REQUEST_URI']);
但加入之后会有个问题。一旦点击换图按钮，页面就会自动刷新，刷新会导致我会丢失item_id
if(isset($_POST['submit_edit_item_id'])) { $_SESSION['edit_item_id'] = $_POST['sub_edit_item_id']; } $item_id = $_SESSION['edit_item_id']; 所以把item_id存在了SESSION['edit_item_id']里，如果item_id不是之前网页传递过来的，就直接读取存在session里的item_id，方便刷新页面以后继续使用。 至于session_start()我放在了header.php里，抱歉我没有做相关的说明。
小弟刚学网页不久，也不知道这种思路是不是正确。话说item_id，我去检查一下，是不是为空。。。
$pic_id = mysql_insert_id();
mysql_query("UPDATE ITEM SET IMG_ID = $pic_id WHERE ITEM_ID = $item_id");
既然 IMG_ID 是自动增长的， 那么 IMG_ID 就是主键了
主键是不可重复的！
SET IMG_ID = $pic_id 就有重复的嫌疑
至少在你的代码中没有看到对 ITEM_ID 赋值的代码
而有
$item_id = $_SESSION['eidt_item_id'];
但是也没有看到 session_start();
虽说 ITEM_ID 可能有初值，但 $item_id 为空的话将造成 SQL 指令为
UPDATE ITEM SET IMG_ID = nnnn WHERE ITEM_ID =
显然是错误的
估计是列名弄混了
img_id在IMAGES里确实是主键，但在ITEM表里也有一个，不是主键。
我做了下测试，如果我删除图片，ITEM表里的img_id就会变成1，即为默认图片。如果我再换图片,没有新的图片插入进去，相对的img_id会变成0。。。可能是应为没有插进去图片，所以mysql_insert_id()返回的值为0吧？
为了以防万一，我在mysql里测试了一下insert语句，发现没有语法问题啊。。。 为什么会这样啊。。。 要抓狂了。。。
对代码稍微做了点修改。。。之前还能插入图片。。。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><?php require_once 'header.php'; require_once 'check.php';?><meta content="en-us" http-equiv="Content-Language" /><meta content="text/html; charset=utf-8" http-equiv="Content-Type" /><title>Item Detail</title><style type="text/css">.auto-style2 { text-align: center;}.auto-style1 { font-size: 36pt; text-align: left; font-family: Default;}.auto-style3 { font-family: Broadway;}</style></head><body><?php if(isset($_POST['submit_edit_item_id'])) { $_SESSION['edit_item_id'] = $_POST['sub_edit_item_id']; } $item_id = $_SESSION['edit_item_id']; $result = mysql_query("SELECT * FROM ITEM WHERE ITEM_ID = $item_id"); if($result) { $row = mysql_fetch_array($result); $user_id = $_SESSION['id']; $name = $row['NAME']; $dsc = $row['DESCRIPTION']; $auc = $row['RESERVE_PRICE']; $bin = $row['BIN_PRICE']; $btime = $row['BEGIN']; $etime = $row['END']; $status = $row['STATUS']; $seller = $row['SELLER_ID']; $winner = $row['WINNER_ID']; $curr_bid = $row['CURR_BID']; $num_bid = $row['NUM_BID']; $img_id = $row['IMG_ID']; echo "item_id is $item_id"; echo "img_id is $img_id"; } $result = mysql_query("SELECT USER_NAME FROM USER WHERE USER_ID = $seller"); if($result) { $row = mysql_fetch_array($result); $seller_name = $row['USER_NAME']; }?> <table align="center" style="width: 100%"> <tr> <td> <div class="auto-style2"> <table align="center" style="width: 100%"> <tr> <td class="auto-style1">Edit item:</td> <td> <a href="http://acadweb1.salisbury.edu/~rwan/home.php"> <img src="/static/imghwm/default1.png" data-src="logo.jpg" class="lazy" style="max-width:90%" style="float: right" style="max-width:90%" / alt="请大侠们帮我看看这个问题出在哪？" ></a></td> </tr> </table> </div> <hr /> <table style="width: 100%"> <tr> <td rowspan="2"> <?php display_image($img_id, 500, 400); ?> <form action="edit_item.php" method="post" enctype="multipart/form-data"> <table><tr><td><input type="file" name="image" /></td></tr> <tr><td><input name="sub_change_pic" type="submit" value="Change picture"> <input name="sub_del_pic" type="submit" value="Delete picture"></td></tr> </table></form> <?php if(isset($_POST['sub_change_pic'])) { if(isset($_FILES['image'])) { $file = $_FILES['image']['tmp_name']; if(!empty($file)) { $image = addslashes(file_get_contents($file)); $image_name = addslashes($_FILES['image']['name']); $image_size = getimagesize($file); if($image_size == false) { print'<p class = "error">The file is not an image.</p>'; } else { mysql_query("LOCK TABLES IMAGES WRITE"); mysql_query("LOCK TABLES ITEM WRITE"); if($img_id == 1) { mysql_query("INSERT INTO IMAGES (IMG_NAME, IMG) VALUES ('$image_name', '$image')"); $pic_id = mysql_insert_id(); mysql_query("UPDATE ITEM SET IMG_ID = $pic_id WHERE ITEM_ID = $item_id"); } else { mysql_query("UPDATE IMAGES SET IMG_NAME = '$image_name', IMG = '$image' WHERE IMG_ID = $img_id"); } mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } } } } if(isset($_POST['sub_del_pic'])) { mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET IMG_ID = 1 WHERE ITEM_ID = $item_id"); if($img_id != 1) { mysql_query("LOCK TABLES IMAGES WRITE"); mysql_query("DELETE FROM IMAGES WHERE IMG_ID = $img_id"); } mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </td> <td><form action="edit_item.php" method="post"> <textarea cols="50" name="title" rows="4"><?php print $name; ?></textarea><br> <input name="change_item_title" type="submit" value="Change item title" /></form></td> </tr> <tr> <td><hr /> <?php if(isset($_POST['change_item_title'])) { $name = $_POST['title']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET NAME = '$name' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } if($status == "SOLD") { $result = mysql_query("SELECT * FROM ITEM_SOLD WHERE ITEM_ID = $item_id"); $row = mysql_fetch_array($result); $buyer = $row['BUYER_ID']; if($_SESSION['id'] == $buyer) { print'<p class = "error">Congratulations! The item is yours.</p>'; } else { print'<p class = "error">Sorry, the item has been sold!</p>'; } } else if($status == "NA") { print'<p class = "error">Item is not available yet!</p>'; } else if($status == "EXPIRE") { print'<p class = "error">Item is expired.</p>'; } else { date_default_timezone_set('America/New_York'); $curr_date = date("Y-m-d"); $curr_time = date("H:i"); $curr_datetime = "$curr_date $curr_time:00"; print"<p><strong>Current datetime: $curr_datetime</strong></p>"; $result = mysql_query("SELECT * FROM ITEM WHERE ITEM_ID = $item_id"); if($result) { $row = mysql_fetch_array($result); $btime = strtotime($row['BEGIN']); $etime = strtotime($row['END']); $date = date("Y-m-d", $etime); $time = date("H:i", $etime); } print'<table><tr><td><form action="edit_item.php" method="post"> Change End time:</td></tr><tr><td><input type="date" name="end_date" value='.$date.'> <input type="time" name="end_time" value='.$time.'></td> <td><input type="submit" name= "go" value="Set Time"> </form></td></tr></table>'; if($_POST['go'] == "Set Time") { $end_date = $_POST['end_date']; $end_time = $_POST['end_time']; $end_time = $end_time.':00'; $end_datetime = strtotime("$end_date $end_time"); $now = strtotime($default_datetime); $problem = false; if ($end_datetime <= $now) { print'You cannot set End time earlier than current time!'; $problem = true; } if(!$problem) { mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET END = '$end_date $end_time' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } } refresh(); } ?> <hr /><br /> <table><tr><td>Buy it Now Price:</td></tr> <tr><td><form action ="edit_item.php" method="post"> <input name="price" type="text" value="<?php print $bin; ?>" ></td></tr> <tr><td><input name="sub_change_price" type="submit" value="Change price" /></form></td></tr></table> <?php if(isset($_POST['sub_change_price'])) { $price = $_POST['price']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET BIN_PRICE = $price WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </td> </tr> <tr> <td class="auto-style3" colspan="2"> <form action ="edit_item.php" method="post"> <textarea cols="80" name="description" rows="10"><?php print $dsc; ?></textarea><br> <input name="change_dsc" type="submit" value="Change item description" /></form></td> </tr> <?php if(isset($_POST['change_dsc'])) { $dsc = $_POST['description']; mysql_query("LOCK TABLES ITEM WRITE"); mysql_query("UPDATE ITEM SET DESCRIPTION = '$dsc' WHERE ITEM_ID = $item_id"); mysql_query("UNLOCK TABLES"); header("location: " . $_SERVER['REQUEST_URI']); } ?> </table> </td> </tr> </table> </body><?php require_once 'webmaster.php'; ?></html> 
Working with Flash Session Data in LaravelMar 12, 2025 pm 05:08 PMLaravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-
cURL in PHP: How to Use the PHP cURL Extension in REST APIsMar 14, 2025 am 11:42 AMThe PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.
Simplified HTTP Response Mocking in Laravel TestsMar 12, 2025 pm 05:09 PMLaravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>
12 Best PHP Chat Scripts on CodeCanyonMar 13, 2025 pm 12:08 PMDo you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom
How to Register and Use Laravel Service ProvidersMar 07, 2025 am 01:18 AMLaravel's service container and service providers are fundamental to its architecture. This article explores service containers, details service provider creation, registration, and demonstrates practical usage with examples. We'll begin with an ove
Explain the concept of late static binding in PHP.Mar 21, 2025 pm 01:33 PMArticle discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo
PHP Logging: Best Practices for PHP Log AnalysisMar 10, 2025 pm 02:32 PMPHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot
Customizing/Extending Frameworks: How to add custom functionality.Mar 28, 2025 pm 05:12 PMThe article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
WebStorm Mac version
Useful JavaScript development tools
Notepad++7.3.1
Easy-to-use and free code editor
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
