php增删改查示例自己写的demo
author:一佰互联 2019-04-29   click:223
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>