php增刪改查入門示例

在php編程中，增刪改查是對數據庫最基本的操做，分享下鏈接數據庫以及增刪改查的一些例子。

1.連接數據庫通用方法：conn.php

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

2.增長 add.php

<?php
include("conn.php");//引入連接數據庫
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>
內容: <textarea rows="5" cols="50" name="con"></textarea><br>
<input type="submit" name="sub" value="發表">
</form>

3.刪除del.php

<?php
include("conn.php");//引入連接數據庫
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";  // www.jbxue.com
}
?>
<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>
內容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>
<input type="submit" name="sub" value="發表">
</form></pre><br>
if(!empty($_GET['del'])){ $d=$_GET['del']; $sql="delete from news where id ='$d'"; } $query=mysql_query($sql); echo "刪除成功"; ?><p></p>

4，改 edit.php頁面

<?php
include("conn.php");//引入連接數據庫
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>
內容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br>
<input type="submit" name="sub" value="發表">
</form>

5.查，列表頁面

<a href="add.php">添加內容</a>
<hr>
<hr>
<form>
<input type="text" name="keys" />
<input type="submit" name="subs" value="搜索"/>
</form>
<?php
include("conn.php");//引入連接數據庫
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>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></h2>
<li><?php echo $rs['dates'] ?></li>
<p><?php echo $rs['contents'] ?></p>
<hr>
<?php
}
?>