Question

I am looking forward to connect two different database from different servers. Also, i would want to run a query that fetches data from both the database into a single result. Am doing this in PHP script with mysql. here is how am looking forward to do it [ without success 🙂 ]

$dbh1 = mysql_connect('server1', 'uname', 'pwd')or die("Unable to connect to MySQL1"); 
$dbh2 = mysql_connect('server2', 'uname', 'pwd') or die("Unable to connect to MySQL2");

mysql_select_db('db1', $dbh1);
mysql_select_db('db2', $dbh2); //both will have same table name though

$qry = mysql_query("select * from db1.table1 where db1.table1.id='100' and db1.table1.id=db2.table1.id",$dbh1) or die(mysql_error());

$row= mysql_fetch_array($qry);

echo $row[2];

Am not getting any result or either error. Any help is appreciated, tnx.

Answer 1

According to the PHP docs:
http://il2.php.net/manual/en/function.mysql-query.php

“If the link identifier is not specified, the last link opened by mysql_connect() is assumed.”

So in this case you’re only retrieving data from $dbh2.

I don’t think it’s possible to do what you are trying to do with one query. You should merge the results after you get them.