php增删改查，自己写的demo

1.链接数据库通用方法：conn.php

<?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

<?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

<?php
  include("conn.php");//引入链接数据库
<?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>


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



4，改 edit.php页面



<?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>


5.查，列表页面
<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
}
?>