学习php的笔记1-数据库连接相关

<?php
/*
 * Created on 2012-7-10
 *FileName: index.php
 * author : jaeheng
 * website: https://blog.phpat.com
 */
$conn = @mysql_connect("localhost","root",“") or die ("链接数据库失败");
if($conn) {
    echo "连接数据库成功，开始执行程序。。。<br />";
    mysql_select_db("test",$conn);
    $sql = "select * FROM emlog_user";
    $query = mysql_query($sql,$conn);
    while($row = mysql_fetch_array($query)){
        echo $row[2]."<br />";
        //mysql_close;
        echo $row[4]."<br />";
    }
}
?>