在php编程中，增删改查是对数据库最基本的操作，分享下连接数据库以及增删改查的一些例子。

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

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";  // www.jbxue.com

}

?>

<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>

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;

} // www.jbxue.com

$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

}

?>