PHP connects to mysql, mssql, oracle

PHP connects to mysql, mssql, oracle

dbtypedef.php
 // Database partial parameter settings
 @define("DATABASE_ACCESS", 0);
 @define("DATABASE_MSSQL", 1);
 @define("DATABASE_ORACLE", 2 );
 @define("DATABASE_MYSQL", 3);
 @define("DATABASE_POSTGRESQL",4);
 @define("DATABASE_SQLITE", 5);
?>

/*======= ================================================== =====*/
/* File name: Model.class.php
/* Summary: Common parent class model for data access layer database processing). */
/* Author:
/* Creation time: 2010- 10-20
/*============================================== ==================*/
class Model {
 protected $mysqli; //
 protected $messList; //Prompt message list
 protected $tabName; //Data table
 protected $fieldList; //Data list
 protected $oracle; //Data list

 public function __construct() {

if(DB_TYPE == DATABASE_MYSQL)
{
 $this->mysqli = new mysqli ( DB_HOST, DB_USER, DB_PWD, DB_NAME );
 $this->mysqli->query("set names utf8");
 if (mysqli_connect_errno ()) {
 echo "" . mysqli_connect_error ();
 $this->mysqli = FALSE;
 exit();
 }
}
else if(DB_TYPE == DATABASE_MSSQL)
{
 $conn=mssql_connect(DB_HOST, DB_USER, DB_PWD)or die("Couldn't connect to SQL Server on ".DB_HOST ."");
 mssql_select_db(DB_NAME,$conn);
 mssql_query("set names utf8");
}
else if(DB_TYPE == DATABASE_ORACLE)
{
 $ora_connstr = "(description=(address=(protocol =tcp) (host=".DB_HOST.")(port=".DB_PORT.")) (connect_data=(service_name=".DB_NAME.")))";
 $this->oracle = oci_connect(DB_USER, DB_PWD,$ora_connstr);
 if (!$this->oracle) {
 echo "oracle connection failed";
 $e = oci_error();
 trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
 }
 }
 }
}