原生代码封装好增删改查
封装好增删改查的sql语句
1.建立一个DB.class.php
<?php
//解析头
header('content-type:text/html;charset=utf-8');
class DB{
function __construct($host,$user,$pass,$dbname){
$link=mysql_connect($host,$user,$pass);
mysql_select_db($dbname,$link);
mysql_query('set names utf8');
}
//查询sql
function select($table,$table1,$id){
//准备查询的sql语句
$sql="select * from $table inner join $table1 on $table.$id=$table1.$id";
//执行
$res=mysql_query($sql);
//定义空数组
$arr=array();
while($row=mysql_fetch_assoc($res)){
$arr[]=$row;
}
return $arr;
}
function all($table){
$sql="select * from $table";
//echo $sql;die;
$res=mysql_query($sql);
//var_dump($res);die;
$arr=array();
while($row=mysql_fetch_assoc($res)){
$arr[]=$row;
}
//var_dump($arr);die;
return $arr;
}
//添加sql语句
function add($table,$arr){
$str=array_values($arr);
$str=implode("','",$str);
$sql="insert into $table values(null,'$str')";
//echo $sql;die;
$res=mysql_query($sql);
if($res&&mysql_affected_rows()>0){
return true;
}else{
return false;
}
}
//删出sql语句
function del($table,$where){
$sql="delete from $table where $where";
$res=mysql_query($sql);
if($res&&mysql_affected_rows()>0){
return true;
}else{
return false;
}
}
//查询修改语句需要查询的语句
function update($table,$where){
$sql="select * from $table where $where";
//echo $sql;die;
$res=mysql_query($sql);
$row=mysql_fetch_assoc($res);
//var_dump($row);die;
return $row;
}
//改
function updateok($table,$update,$where){
$sql="update $table set $update where $where";
$res=mysql_query($sql);
if($res&&mysql_affected_rows()>0){
return true;
}else{
return false;
}
}
}
?>
1.form表单页面form.php
<?php
include 'DB.class.php';
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$arr=$db->all('nickname');
//var_dump($arr);die;
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title></title>
</head>
<body>
<center>
<form action="add.php" method='post'>
<table border=1>
<tr>
<td>请选择昵称:</td>
<td>
<select name="nid">
<?php foreach($arr as $v){?>
<option value="<?php echo $v['nid'];?>"><?php echo $v['name'];?></option>
<?php }?>
</select>
</td>
</tr>
<tr>
<td>留言内容:</td>
<td><textarea name="content" cols="20" rows="5"></textarea></td>
</tr>
<tr>
<td><input type="submit" value='提交留言'/></td>
<td></td>
</tr>
</table>
</form>
</center>
</body>
</html>
2.添加sql语句，直接引进DB.class.php
add.php
<?php
include 'DB.class.php';
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$arr=$_POST;
$res=$db->add('message',$arr);
if($res){
echo "<script>alert('添加成功');location.href='list.php'</script>";
}else{
echo "<script>alert('添加失败');location.href='form.php'</script>";
}
?>
3.删除sql语句，直接引进DB.class.php
delete.php
<?php
include 'DB.class.php';
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$id=$_GET['id'];
$res=$db->del('message',"mid=$id");
if($res){
echo "<script>alert('删除成功');location.href='list.php'</script>";
}else{
echo "<script>alert('删除失败');location.href='list.php'</script>";
}
?>
4.显示表单list.php
<?php
include 'DB.class.php';
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$arr=$db->select('message','nickname','nid');
?>
<center>
<table border=1>
<tr>
<th>昵称</th>
<th>留言内容</th>
<th>操作</th>
</tr>
<?php foreach($arr as $v){?>
<tr>
<td><?php echo $v['name'];?></td>
<td><?php echo $v['content'];?></td>
<td><a href="delete.php?id=<?php echo $v['mid'];?>">删除</a>||<a href="update.php?id=<?php echo $v['mid'];?>">修改</a></td>
</tr>
<?php }?>
</table>
</center>
5.修改数据
<?php
include 'DB.class.php';
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$id=$_GET['id'];
$row=$db->update('message',"mid=$id");
//var_dump($row);die;
$arr=$db->all('nickname');
?>
<center>
<form action="updateok.php?id=<?php echo $row['mid'];?>" method='post'>
<table border=1>
<tr>
<td>请选择昵称:</td>
<td>
<select name="nid">
<?php foreach($arr as $v){?>
<option value="<?php echo $v['nid'];?>" <?php if($row['nid']=$v['nid']){ echo 'selected';}?>><?php echo $v['name'];?></option>
<?php }?>
</select>
</td>
</tr>
<tr>
<td>留言内容:</td>
<td><textarea name="content" cols="20" rows="5"><?php echo $row['content'];?></textarea></td>
</tr>
<tr>
<td><input type="submit" value='修改留言'/></td>
<td></td>
</tr>
</table>
</form>
</center>
将修改的数据调到updateok.php中
<?php
include 'DB.class.php';
$nid=$_POST['nid'];
$content=$_POST['content'];
$id=$_GET['id'];
$db=new DB('127.0.0.1:3306','root','root','dongwu');
$res=$db->updateok('message',"content='$content',nid=$nid","mid=$id");
if($res){
echo "<script>alert('修改成功');location.href='list.php'</script>";
}else{
echo "<script>alert('修改失败');location.href='list.php'</script>";
}
?>