php连接mysql,oracle,mssql数据库连接代码

php连接mssql代码如下:

$server='hbds3';    
$username='username';    
$password='pwd';    
$database='database';    
$conn=mssql_connect($server,$username,$password)    
or die("couldn't connect to sql server on $server");    
$db=mssql_select_db($database) or die("couldn't open database $database");

php连接oracle代码如下:

$conn = oci_connect("databasename","passwd","sid"); 
if (!$conn) { 
$e = oci_error(); 
trigger_error(htmlentities($e['message'], ent_quotes), e_user_error); 
}

php连接mysql,代码如下:

$conn=mysql_connect("localhost","root","admin") or die("数据库服务器连接错误".mysql_error()); 
mysql_select_db("admin",$conn) or die("数据库访问错误".mysql_error());//开源代码phprm.com 
mysql_query("set names gb2312");

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