在php中执行MySQL时没有选择数据库

Question

I'm having problems with this php code which needs to create a table in the database specified by the user. But whenever I try to execute the SQL it tells me no database selected. My code is as follow

<?php  
$con = mysql_connect("127.0.0.1","peter")
or die('Error connecting to mysql'); // Check connection  
// Create table 
mysql_select_db("USE Ebooks");//Select Database

$foldername = mysql_real_escape_string($_POST['foldername']);//Obtain Folder Name 

$sql = sprintf("CREATE TABLE %s (ID CHAR(3) ,Books CHAR(30))", $foldername);  
mysql_query($sql) or die(mysql_error()); 
mysql_close($con);  
?>

Answer 1

使用

mysql_select_db( "Ebooks" ) or die( 'Error'. mysql_error() );

Answer 2

使用此代码：

mysql_select_db("Ebooks");//Select Database