mysql-This database-connected statement is available in the SAE, but not in Bae, does anyone know why?

Mysqlsaebae database PHP

The following statements, which can be applied in the SAE, are not effective in BAE.

 //连接数据库$con = mysql_connect("{$host}:{$port}",$user,$pwd,true) or die("Connect Server Failed: " . mysql_error());//进入某个数据库mysql_select_db($dbname,$con)) or die("Select Database Failed: " . mysql_error($con));

In Baidu, use the following statement to

 //连接数据库$con = mysql_connect("{$host}:{$port}",$user,$pwd,true);if(!$con){    die("Connect Server Failed: " . mysql_error());}//进入某个数据库if(!mysql_select_db($dbname,$con)) {    die("Select Database Failed: " . mysql_error($con));}

