php增删改查示例自己写的demo

  1.链接数据库通用方法:conn.php

  

复制代码 代码如下:

  <?php

  //第一步:链接数据库

  $conn=@mysql_connect("localhost:3306","root","root")or die ("mysql链接失败");

  //第二步: 选择指定的数据库,设置字符集

  @mysql_select_db("php_blog",$conn) or die ("db链接失败".mysql_error());

  mysql_query('SET NAMES UTF8')or die ("字符集设置错误");

  ?>

  2.增加 add.php

  

复制代码 代码如下:

  <?php

  include("conn.php");//引入链接数据库

  if(!empty($_POST['sub'])){

  $title=$_POST['title'];

  $con=$_POST['con'];

  echo $sql="insert into news(id,title,dates,contents) value (null,'$title',now(),'$con')" ;

  mysql_query($sql);

  echo"插入成功";

  }

  ?>

  <form action="add.php" method="post">

  标题: <input type="text" name="title"><br>

  内容: <textarea rows="5" cols="50" name="con"></textarea><br>

  <input type="submit" name="sub" value="发表">

  </form>

  3.删除del.php

  

复制代码 代码如下:

  <?php

  include("conn.php");//引入链接数据库<pre name="code" class="html"><?php

  include("conn.php");//引入链接数据库

  if(!empty ($_GET['id'])){

  $sql="select * from news where id='".$_GET['id']."'";

  $query=mysql_query($sql);

  $rs=mysql_fetch_array($query);

  }

  if(!empty($_POST['sub'])){

  $title=$_POST['title'];

  $con=$_POST['con'];

  $hid=$_POST['hid'];

  $sql="update news set title='$title',contents='$con' where id='$hid' limit 1 ";

  mysql_query($sql);

  echo "<script> alert('更新成功'); location.href='index.php'</script>";

  echo"更新成功";

  }

  ?>

  <form action="edit.php" method="post">

  <input type="hidden" name="hid" value="<?php echo $rs['id']?>"/>

  标题: <input type="text" name="title" value="<?php echo $rs['title']?>"><br>

  内容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>

  <input type="submit" name="sub" value="发表">

  </form></pre><br>

  if(!empty($_GET['del'])){ $d=$_GET['del']; $sql="delete from news where id ='$d'"; } $query=mysql_query($sql); echo "删除成功"; ?><p></p>

  <pre></pre>

  <br>

  4,改 edit.php页面

  <p></p>

  <p><br>

  </p>

  <p></p><pre name="code" class="html"><?php

  include("conn.php");//引入链接数据库

  if(!empty ($_GET['id'])){

  $sql="select * from news where id='".$_GET['id']."'";

  $query=mysql_query($sql);

  $rs=mysql_fetch_array($query);

  }

  if(!empty($_POST['sub'])){

  $title=$_POST['title'];

  $con=$_POST['con'];

  $hid=$_POST['hid'];

  $sql="update news set title='$title',contents='$con' where id='$hid' limit 1 ";

  mysql_query($sql);

  echo "<script> alert('更新成功'); location.href='index.php'</script>";

  echo"更新成功";

  }

  ?>

  <form action="edit.php" method="post">

  <input type="hidden" name="hid" value="<?php echo $rs['id']?>"/>

  标题: <input type="text" name="title" value="<?php echo $rs['title']?>"><br>

  内容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>

  <input type="submit" name="sub" value="发表">

  </form></pre><br>

  5.查,列表页面<pre name="code" class="html"><a href="add.php">添加内容</a>

  <hr>

  <hr>

  <form>

  <input type="text" name="keys" />

  <input type="submit" name="subs" value="搜索"/>

  </form>

  <?php

  include("conn.php");//引入链接数据库

  if(!empty($_GET['keys'])){

  $w=" title like '%".$_GET['keys']."%'";

  }else{

  $w=1;

  }

  $sql="select * from news where $w order by id desc";

  $query=mysql_query($sql);

  while($rs=mysql_fetch_array($query)){

  ?>

  <h2>标题:<a href="view.php?id=<?php echo $rs['id'] ?>"><?php echo $rs['title'] ?></a> <a href="edit.php?id=<?php echo $rs['id'] ?>">编辑</a>||<a href="del.php?del=<?php echo $rs['id'] ?>">删除</a></h2>

  <li><?php echo $rs['dates'] ?></li>

  <p><?php echo $rs['contents'] ?></p>

  <hr>

  <?php

  }

  ?>

  </pre><br>

  <p></p>

  <p><br>

  </p>