php mysql连接例子

<?PHP

@$conn = mysql_connect("127.0.0.1","root","");     //返回false或resource

if(!$conn){
   
    die(mysql_error());  
}
$db_selected = mysql_select_db("Route",$conn);   //返回false或true

if(!$db_selected){
   
    die(mysql_error()); 
}

//查找数据
$sql = "select  *  from  r_product";   
$re = mysql_query($sql);    //返回resource或false
if(!$re){
   
    die(mysql_error());
}
while($arr = mysql_fetch_array($re)){  //返回的数组包括索引数组和关联数组两种
        var_dump($arr);
}
while($arr = mysql_fetch_row($re)){    //返回的数组包括索引数组
        var_dump($arr);
}
while($arr = mysql_fetch_assoc($re)){  //返回的数组包括关联数组
        var_dump($arr);
}

mysql_close($conn);   //关闭数据库连接
?> 

 PDO

$dsn = "mysql:host=127.0.0.1;dbname=test";
$db = new PDO($dsn, 'root', '');
$re = $db->query("select * from test limit 1");
while($a = $re->fetch()) {
     var_dump($a);      
}