一个连接两个不同MYSQL数据库的PHP程序

　
　　echo "Connecting as MySQL
\n";　
　　$connection1 = mysql_connect('localhost', 'mysql', '') or die($php_errormsg);　
　　echo "connection1 is $connection1
\n";　
　　echo "Selecting test for mysql user
\n";　
　　mysql_select_db('test', $connection1) or @die("Error " . $php_errormsg . mysql_error());　
　　echo "Connection as joyce
\n";　
　　$connection2 = mysql_connect('localhost', 'joyce', '') or die($php_errormsg);　
　　echo "connection2 is $connection2
\n";　
　　echo "Selecting books for joyce user
\n";　
　　$db2 = mysql_select_db('techbizbookguide', $connection2) or die(mysql_error());　
　　$query1 = "select foo from test";　
　　$query2 = "select title, authorFirst, authorLast from bookinfo";　
　　echo "Querying test
\n";　
　　$users = mysql_query($query1, $connection1) or die(mysql_error());　
　　echo "Querying books
\n";　
　　$books = mysql_query($query2, $connection2) or die(mysql_error());　
　　echo "Foos from test
\n";　
　　while (list($foo) = mysql_fetch_row($users)){　
　　　　echo $foo, "
\n";　
　　}　
　　echo "Books in techbizbookguide
\n";　
　　while (list($title, $authorFirst, $authorLast) = mysql_fetch_row($books)){　
　　　　//Use trim in case we have a book by "Madonna" or "PRince" or...　
　　　　echo $title, ' by ', trim($authorFirst . ' ' . $authorLast), "
\n";　
　　}　
?>