php - connecting to multiple databases -


i using sphinx site search , works great trying connect 2 mysql databases same exact structure , db2 continuance of db1 info should flow smoothly. can results switching db name in code how can select both @ once?

here code im using

$conf['sphinx_host'] = 'localhost'; $conf['sphinx_port'] = 9312; $conf['mysql_host'] = "localhost"; $conf['mysql_username'] = "user"; $conf['mysql_password'] = "password"; $conf['mysql_database'] = "db1"; $conf['sphinx_index'] = "index index2";   $db = mysql_connect($conf['mysql_host'],$conf['mysql_username'],$conf['mysql_password']) or die("error: unable connect database"); mysql_select_db($conf['mysql_database'], $db) or die("error: unable select database");   $sql = str_replace('$ids',implode(',',$ids),$conf['mysql_query']); $result = mysql_query($sql) or die($conf['debug']?("error: mysql query failed: ".mysql_error()):"error: please try later");

this code works fine if enter single mysql db $conf['mysql_database'] = "db1"; need select db1 , db2. know how can achieve this? did not post query because don't think useful simple select query , sure idea.

if databases hosted on same server, can pick 1 arbitrarily in call mysql_select_db() , qualify table names in sql queries databasename. prefix. can mix , match tables both databases in single query. eg.

select h.lastname, h.firstname, p.petname     db1.humans h     left outer join db2.pets p on p.human_id = h.id;

if don't need write queries involve both databases, can call mysql_select_db() again each time need switch databases.

if databases hosted on different servers, need 2 separate calls mysql_connect(). in case, make sure pass optional $link parameter all mysql_ functions because default behavior use recent connection, can lead kinds of bugs. since each database have separate connection, not able run individual queries access both databases.


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