php如何實現(xiàn)增刪改查

這篇文章主要介紹了php如何實現(xiàn)增刪改查，具有一定借鑒價值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。

1.鏈接數(shù)據(jù)庫通用方法：conn.php

復(fù)制代碼 代碼如下:

<?php
//第一步：鏈接數(shù)據(jù)庫
$conn=@mysql_connect("localhost:3306","root","root")or die ("mysql鏈接失敗");
//第二步: 選擇指定的數(shù)據(jù)庫，設(shè)置字符集
@mysql_select_db("php_blog",$conn) or die ("db鏈接失敗".mysql_error());
mysql_query('SET NAMES UTF8')or die ("字符集設(shè)置錯誤");
?>

2.增加 add.php

復(fù)制代碼 代碼如下:

<?php
include("conn.php");//引入鏈接數(shù)據(jù)庫
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">
標題: <input type="text" name="title"><br>
內(nèi)容: <textarea rows="5" cols="50" name="con"></textarea><br>
<input type="submit" name="sub" value="發(fā)表">
</form>

3.刪除del.php

復(fù)制代碼 代碼如下:

<?php
include("conn.php");//引入鏈接數(shù)據(jù)庫<pre name="code" class="html"><?php
include("conn.php");//引入鏈接數(shù)據(jù)庫
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']?>"/>
標題: <input type="text" name="title" value="<?php echo $rs['title']?>"><br>
內(nèi)容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>
<input type="submit" name="sub" value="發(fā)表">
</form></pre><br>
if(!empty($_GET['del'])){ $d=$_GET['del']; $sql="delete from news where id ='$d'"; } $query=mysql_query($sql); echo "刪除成功"; ?><p></p>
<pre></pre>
<br>
4，改 edit.php頁面
<p></p>
<p><br>
</p>
<p></p><pre name="code" class="html"><?php
include("conn.php");//引入鏈接數(shù)據(jù)庫
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']?>"/>
標題: <input type="text" name="title" value="<?php echo $rs['title']?>"><br>
內(nèi)容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>
<input type="submit" name="sub" value="發(fā)表">
</form></pre><br>
5.查，列表頁面<pre name="code" class="html"><a href="add.php">添加內(nèi)容</a>
<hr>
<hr>
<form>
<input type="text" name="keys" />
<input type="submit" name="subs" value="搜索"/>
</form>
<?php
include("conn.php");//引入鏈接數(shù)據(jù)庫
if(!empty($_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)){
?>
<h3>標題:<a href="view.php?id=<?php echo $rs['id'] ?>"><?php echo $rs['title'] ?></a> <a href="edit.php?id=<?php echo $rs['id'] ?>">編輯</a>｜｜<a href="del.php?del=<?php echo $rs['id'] ?>">刪除</a></h3>
<li><?php echo $rs['dates'] ?></li>
<p><?php echo $rs['contents'] ?></p>
<hr>
<?php
}
?>
</pre><br>
<p></p>
<p><br>
</p>

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