php文件上传并将其路径保存到数据库

<?php
$mysql_server_name='localhost';//数据库连接主机名
$mysql_username='root';//数据库连接用户
$mysql_password='123456';//数据库连接密码
$mysql_database='test';//选用的数据库
$picpath="";//定义存储路径
$timeName=date('YmdHis',time());//加上时间撮
$link=mysql_connect($mysql_server_name,$mysql_username,$mysql_password); //连接数据库
mysql_select_db($mysql_database, $link); //选择数据库
/*对上传的文件进行判断，判断是否为图片格式，并且大小不超过2M*/
if ((($_FILES["picpath"]["type"] == "image/gif") || ($_FILES["picpath"]["type"] == "image/jpeg") || ($_FILES["picpath"]["type"] == "image/png") || ($_FILES["picpath"]["type"] == "image/pjpeg")) && ($_FILES["picpath"]["size"] < 20000000)) {
if ($_FILES["picpath"]["error"] > 0) {
echo "Return Code: " . $_FILES["picpath"]["error"] . "<br />";
} else {
$_FILES["picpath"]["name"] = date('YmdHis',time()).$_FILES["picpath"]["name"];//为图片重新命名，避免重复
//存储路径为uploads/town/
if (file_exists("uploads/town/" . $_FILES["picpath"]["name"])) {
echo $_FILES["picpath"]["name"] . " already exists. ";
} else {
//将文件上传至服务器
move_uploaded_file($_FILES["picpath"]["tmp_name"], "uploads/town/" . $_FILES["picpath"]["name"]);
$picpath="uploads/town/" . $_FILES["picpath"]["name"];
}
}
}else {
echo "Invalid picpath";
}
/*获取修改的值*/
$content=$_POST['content'];
$id=$_POST['id'];
/*更改图片路径以及图片说明*/
$q = "update tb_demo set picpath='$picpath',content='$content' where id=$id";
mysql_query("SET NAMES gbk");
mysql_query($q,$link);//执行sql语句
?>