Detailed explanation of operating MySQL database with PHP (4)
新闻内容模块
所涉及的内容
1. 新闻内容表的设计
2. 新闻列表的分页（即每页显示固定条数的新闻）
3. 显示新闻的内容（点击“新闻标题”，跳转到新闻内容页面（news_content.php）显示新闻具体内容）
4. 新闻的添加（点击“添加新闻”按钮，跳转到新闻添加页面（news_add.php））
5. 新闻的删除（点击“删除”，跳转到新闻删除页面（news_del.php））
6. 新闻的修改（点击“修改”，跳转到新闻修改页面（news_edit.php））
1. 新闻内容表
| 字段名 | 解释 |
|---|---|
| cat | 分类 |
| title | 标题 |
| author | 作者 |
| source | 来源 |
| keywords | 网页关键字 |
| description | 描述 |
| orderby | 排序 |
| content | 内容 |
| hits | 点击率 |
| addate | 发布时间 |
2. 显示新闻列表 manage.php
该页面实现
新闻列表的分页
包含功能
1.显示新闻的内容（news_content.php）
2.新闻的添加（news_add.php）
3.新闻的删除（news_del.php）
4.新闻的修改（news_edit.php）
分页原理
| 项 | 变量表示 | 解释 |
|---|---|---|
| 总记录数 | $records | mysql_num_rows() |
| 每页显示显示页数 | $pagesize | 用户定义 |
| 总页数 | $pages | $records / $pagesize |
| 当前页 | $page | 用户选择 |
函数ps
mysql_num_rows() 函数返回结果集中行的数目。
分页的SQL语句
SELECT * FROM news LIMIT \$startrow,\$pagesize;
| 页数 | 表示 |
|---|---|
| 第一页 $page=1 | LIMIT 0,10 |
| 第二页 $page=2 | LIMIT 10,10 |
| 第三页 $page=3 | LIMIT 20,10 |
| …… | …… |
可以总结出
$startrow = ($page - 1) * $pagesize;
新闻列表页面（manage.php）
<!--manage.php-->
<?php
//包含连接MySQL的文件include "conn.php";
//分页的相关变量$pagesize = 5;
//每页显示的新闻条数
//获取地址栏中传递的page参数,确定当前页，当前行（所有记录中的）
if(empty($_GET['page'])){ $page = 1; //默认为第一页
$startrow = 0;
}else{ $page = (int)$_GET['page'];
//当前页数
$startrow = ($page-1)*$pagesize; //当前行数}//构建查询的SQL语句
$sql = "SELECT * FROM 007_news";
//执行SQL语句，返回的是所有记录的结果集$result = mysql_query($sql);//总记录数和总页数
$records = mysql_num_rows($result);$pages = ceil($records / $pagesize);//构建分页的SQL语句
$sql = "SELECT * FROM 007_news ORDER BY orderby ASC,id DESC LIMIT $startrow,$pagesize";
//执行SQL语句，返回的是结果集（10条记录）$result = mysql_query($sql);?>
<!DOCTYPE html>
<html xmlns="
<head><meta charset=UTF-8>
<title>管理新闻列表</title>
<script type="text/javascript">
function confirmDel(id){
//询问是否删除记录
if(window.confirm("你确定要删除吗？")){ //跳转到PHP的删除页面 del.php
location.href = "news_del.php?id="+id;
}
}
</script>
</head>
<body>
<p style="padding:5px;">
<input type="button" value="添加新闻" onClick="javascript:location.href='news_add.php'"/></p>
<table width="70%" border="1" bordercolor="#CCC" rules="all" cellpadding="5" align="center">
<tr>
<th>编号</th>
<th>新闻标题</th>
<th>作者</th>
<th>来源</th>
<th>排序</th>
<th>点击率</th>
<th>发布时间</th>
<th>操作选项</th>
</tr>
<?php
while($arr = mysql_fetch_assoc($result)){ ?>
<tr>
<td><?php echo $arr['id']?></td>
<td>
<a target="_blank" href="news_content.php?id=<?php echo $arr['id']?>">
<?php echo $arr['title']?>
</a>
</td>
<td><?php echo $arr['author']?></td>
<td><?php echo $arr['source']?></td>
<td><?php echo $arr['orderby']?></td>
<td><?php echo $arr['hits']?></td>
<td><?php echo date("Y-m-d H:i", $arr['addate'])?></td>
<td>
<a href="news_edit.php?id=<?php echo $arr['id']?>">修改</a>
<a href="javascript:void(0)" onClick="confirmDel(<?php echo $arr['id']?>)">删除</a>
</td>
</tr>
<?php }?>
<tr>
<td colspan="8" align="center">
<?php
$prev = $page-3;
$next = $page+3;
if($page < 4){
$prev = 1;
$next = 7; //后面补齐
}
if($page > $pages-3){
$next = $pages;
$prev = $pages-6; //前面补齐
} for($i=$prev;$i<=$next;$i++){ //当前页页码号在中间，前后各3个页码号，显示7个页码号
if($i == $page){//当前页，不加链接
echo "$i ";
}else{ echo "<a href='manage.php?page=$i'>$i</a> ";
}
} ?>
</td>
</tr></table></body></html>运行的效果
3. 显示新闻内容 news_content.php
点击新闻列表中某条新闻的标题，之后会跳转到该条新闻的详细内容页面（news_content.php）
<!--news_content.php-->
<?php
//**************************读取一条记录******************************
//包含连接数据库的文件
include "conn.php";
//获取地址栏传递过来的id值
$id = $_GET['id'];
//构建更新点击率的SQL语句
$sql = "UPDATE 007_news SET hits=hits+1 WHERE id=$id";
mysql_query($sql);
//构建查询的SQL语句
$sql = "SELECT * FROM 007_news WHERE id=$id";
//执行SQL语句
$result = mysql_query($sql);
//取出唯一的一条记录
$arr = mysql_fetch_assoc($result);
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title><?php echo $arr['title']?></title>
</head>
<body>
<table width="1000" cellpadding="5" align="center">
<tr>
<th><h2><?php echo $arr['title']?></h2></th>
</tr>
<tr>
<td bgcolor="#ccc" align="center">
作者：<?php echo $arr['author']?>
来源：<?php echo $arr['source']?>
点击率：<?php echo $arr['hits']?>次
发布时间：<?php echo date("Y-m-d H:i", $arr['addate'])?>
</td>
</tr>
<tr>
<td><?php echo $arr['content']?></td>
</tr>
</table>
</body>
</html>运行效果
4. 添加新闻
在新闻列表页（manage.php）点击“添加新闻”，会跳转到“添加新闻”页面（news_add.php）。添加成功后，数据库中就添加了该条新增记录了，然后跳转到操作成功提示页面，5秒后，跳转到新闻列表页面（manage.php）。
添加新闻（news_add.php）
<!--news_add.php-->
<?php
//*****************************添加新闻********************************
//连接MySQL数据库
include "conn.php";
//判断表单是否提交
if(isset($_POST['ac']) && $_POST['ac']=="add"){
//获取表单提交的数据
$cat = $_POST['cat'];
$title = $_POST['title'];
$author = $_POST['author'];
$source = $_POST['source'];
$orderby = $_POST['orderby'];
$keywords = $_POST['keywords'];
$description = $_POST['description'];
$content = $_POST['content'];
$addate = time();
//构建写入的SQL语句
$sql = "INSERT INTO 007_news(cat,title,author,source,orderby,keywords,description,content,addate) VALUES($cat,'$title','$author','$source',$orderby,'$keywords','$description','$content',$addate)";
//执行SQL语句
if(mysql_query($sql)){
//如果执行成功，则跳转到success.php页面
$url = "manage.php";
$message = urlencode("记录添加成功！");
echo "<script>location.href='success.php?url=$url&message=$message'</script>";
exit();
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>添加新闻</title>
<!--引入编辑器文件和语言包-->
<script charset="utf-8" src="js/editor/kindeditor-min.js"></script>
<script charset="utf-8" src="js/editor/lang/zh_CN.js"></script>
<script>
//加入在线编辑器
var editor;
KindEditor.ready(function(K) {
//在当前网页中，查找<textarea name = "content"></textarea>，并替换成kindeditor编辑器。
editor = K.create('textarea[name="content"]', {
allowFileManager : true //是否允许上传文件
});
});
</script>
</head>
<body>
<form name="form1" method="post" action="">
<table width="800" border="1" rules="all" bordercolor="#ccc" cellpadding="5" align="center">
<tr>
<th colspan="2">添加新闻</th>
</tr>
<tr>
<td width="80" align="center">新闻类型：</td>
<td>
<select name="cat">
<option value="1">新闻类型1</option>
<option value="2">新闻类型2</option>
<option value="3">新闻类型3</option>
<option value="4">新闻类型4</option>
</select>
</td>
</tr>
<tr>
<td align="right">新闻标题：</td>
<td><input type="text" name="title" size="100"/></td>
</tr>
<tr>
<td align="right">作者：</td>
<td>
<input type="text" name="author" value="admin" size="10"/>
来源：<input type="text" name="source" value="default" size="40"/>
排序：<input type="text" name="orderby" maxlength="2" value="50"/>
</td>
</tr>
<tr>
<td align="right">关键字：</td>
<td><input type="text" name="keywords" size="100"/></td>
</tr>
<tr>
<td align="right">描述：</td>
<td><input type="text" name="description" size="100"></td>
</tr>
<tr>
<td align="right">内容：</td>
<td><textarea name="content" style="width:100%;height:240px;"></textarea></td>
</tr>
<tr>
<td> </td>
<td>
<input type="submit" value="提交"/>
<input type="hidden" name="ac" value="add"/> <!--隐藏域，表单验证-->
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</body>
</html>代码PS
上述代码中引入了在线HTML编辑器：kindeditor 将editor文件直接“复制”到要引入文件的同级目录即可。
在需要的编辑器的页面，引入如下文件：
<!--在代码中引入在线HTML编辑器：kindeditor-->
<script charset="utf-8" src="js/editor/kindeditor-min.js"></script>
<script charset="utf-8" src="js/editor/lang/zh_CN.js"></script>
<script>
//加入在线编辑器
var editor;
KindEditor.ready(function(K) {
//在当前网页中，查找<textarea name = ‘content’></textarea>，并替换成kindeditor编辑器。
editor = K.create('textarea[name="content"]', {
allowFileManager : true //是否允许上传文件
});
});
</script>
<textarea id="content" name="content" style="width:100%;height:300px; "></textarea>运行效果
5. 删除新闻
在新闻列表页（manage.php）点击“删除”，出现确认删除的提示框，点击“确认”后，会跳转到新闻删除页面（news_del.php），对该条新闻进行删除，此后数据库中就没有该条记录了。删除成功后，跳转到操作成功提示页面，5秒后，跳转到新闻列表页面（manage.php）。
删除新闻（news_del.php）
<!--news_del.php-->
<?php
//**********************删除记录***********************
//包含连MySQL接数据库的文件conn.php
include "conn.php";
//获取地址栏传递的id参数,GET方式获取地址栏数据，POST获取表单数据
$id = (int)$_GET["id"];
//构建删除的SQL语句
$sql = "DELETE FROM 007_news WHERE id=$id";
//执行SQL语句
if(mysql_query($sql))
{
//如果执行成功，则跳转到success.php页面
$url = "manage.php";
$message = urlencode("id={$id}记录删除成功！");
echo "<script>location.href='success.php?url=$url&message=$message'</script>";
}else
{
//如果执行失败，则跳转到error.php页面
$message = urlencode("记录删除失败！");
header("location:error.php?message=$message");
}
?>6. 修改新闻
在新闻列表页（manage.php）点击修改，会跳转到新闻修改页面（news_edit.php），首先页面会读取指定id的数据，并写入对应的表单输入框中，对照原始信息作修改，点击修改后，数据库的记录也就更新了。修改成功后，跳转到操作成功提示页面，5秒后，跳转到新闻列表页面（manage.php）。
修改新闻（news_edit.php）
<!--news_edit.php-->
<?php
//*****************************修改新闻********************************
//连接MySQL数据库
include "conn.php";
//判断表单是否提交
if(isset($_POST['ac']) && $_POST['ac']=="add"){
//获取表单提交的数据
$cat = $_POST['cat'];
$title = $_POST['title'];
$author = $_POST['author'];
$source = $_POST['source'];
$orderby = $_POST['orderby'];
$keywords = $_POST['keywords'];
$description = $_POST['description'];
$content = $_POST['content'];
//通过表单提交用POST方式，获得隐藏域提交过来的id值
//这里不直接通过GET方式来获取id值，而是用隐藏域来获得id，安全性更高，而且地址栏的值可以改动
$id = $_POST['id'];
//构建要修改的SQL语句
$sql = "UPDATE 007_news SET cat=$cat,title='$title',author='$author',source='$source',orderby=$orderby,keywords='$keywords',description='$description',content='$content' WHERE id=$id";
//执行SQL语句
if(mysql_query($sql)){
//如果执行成功，则跳转到success.php页面
$url = "manage.php";
$message = urlencode("记录修改成功！");
echo "<script>location.href='success.php?url=$url&message=$message'</script>";
exit();
}
}else{ //表单提交之前，应先显示数据库中的原始数据
//获取地址栏传递的id值
$id = $_GET['id'];
//构建查询的SQL语句
$sql = "SELECT * FROM 007_news WHERE id=$id";
//执行SQL语句
$result = mysql_query($sql);
//取出记录
$arr = mysql_fetch_assoc($result);
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>修改新闻</title>
<!--引入编辑器文件和语言包-->
<script charset="utf-8" src="js/editor/kindeditor-min.js"></script>
<script charset="utf-8" src="js/editor/lang/zh_CN.js"></script>
<script>
//加入在线编辑器
var editor;
KindEditor.ready(function(K) {
//在当前网页中，查找<textarea name = "content"></textarea>，并替换成kindeditor编辑器。
editor = K.create('textarea[name="content"]', {
allowFileManager : true //是否允许上传文件
});
});
</script>
</head>
<body>
<form name="form1" method="post" action="">
<table width="800" border="1" rules="all" bordercolor="#ccc" cellpadding="5" align="center">
<tr>
<th colspan="2">修改新闻</th>
</tr>
<tr>
<td width="80" align="center">新闻类型：</td>
<td>
<select name="cat">
<option value="1" <?php if($arr['cat']==1){echo 'selected=selected';}?> >公司新闻</option>
<option value="2" <?php if($arr['cat']==2){echo 'selected=selected';}?> >行业新闻</option>
<option value="3" <?php if($arr['cat']==3){echo 'selected=selected';}?> >疾病预防</option>
<option value="4" <?php if($arr['cat']==4){echo 'selected=selected';}?> >帮助文档</option>
</select>
</td>
</tr>
<tr>
<td align="right">新闻标题：</td>
<td><input type="text" name="title" size="100" value="<?php echo $arr['title']?>"/></td>
</tr>
<tr>
<td align="right">作者：</td>
<td>
<input type="text" name="author" value="<?php echo $arr['author']?>" size="10"/>
来源：<input type="text" name="source" value="<?php echo $arr['source']?>" size="40"/>
排序：<input type="text" name="orderby" maxlength="2" value="<?php echo $arr['orderby']?>"/>
</td>
</tr>
<tr>
<td align="right">关键字：</td>
<td><input type="text" name="keywords" size="100" value="<?php echo $arr['keywords']?>"/></td>
</tr>
<tr>
<td align="right">描述：</td>
<td><input type="text" name="description" size="100" value="<?php echo $arr['desciption']?>"></td>
</tr>
<tr>
<td align="right">内容：</td>
<td><textarea name="content" style="width:100%;height:240px;"><?php echo $arr['content']?></textarea></td>
</tr>
<tr>
<td> </td>
<td>
<input type="submit" value="修改"/>
<input type="hidden" name="ac" value="add"/> <!--隐藏域，表单验证-->
<input type="hidden" name="id" value="<?php echo $id?>"/> <!--隐藏域，用于传递通过GET方式获得的id值-->
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</body>
</html>The above is the detailed content of Detailed explanation of operating MySQL database with PHP (4). For more information, please follow other related articles on the PHP Chinese website!
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