Connect 2 databases together on one page

Databases
1

hi all

i want to use and connect two databases together.

i m connecting first database file “config.php” through this code


$conn=mysql_connect("localhost","root","") or die(mysql_error());
mysql_select_db("tally",$conn);
session_start();
$unique_id=session_id();

second database file “config2.php” through this code


$conn2=mysql_connect("localhost","root","") or die(mysql_error());
mysql_select_db("repair_data",$conn2);
session_start();
$unique_id=session_id();

in my webpage i m calling them as


require_once("config.php");
require_once("config2.php");

i m not able to connect to both dbs together.

vineet

2

Why, what happens? An error?

3

I am not much of a PHP expert but has quite a bit of old programming languages coding experience. So, doesn’t including each of them into the same page get the $unique_id only exist once in the session? If so, the $unique_id will be set first to one session_id(), and then to the other. If so, the variable will only contain the session_id() from the last call…?

If that is the case, just do as yuo did with conn and conn2 - have two different names.

If not this is the case, what type of errors do you get and at what kind of line in the code?

4

That would be the case Bagtjesen, as soon as the second connection is set to the variable $unique_id it wipes out the information from the first call. Good catch.

5

If both databases are on the same host, you can do selects like this:


SELECT database1.table1.field, database2.table2.field FROM  database1.table1,  database2.table2 WHERE database1.table1.field = database2.table2.field;

It might not be fast, but it works.

On the other hand, your PHP is totally wrong.
#1 you can only start the session once.
#2 your $unique_id from the first script will be overwritten with the second one.
#3 your mysql_select_db from the first script will be overwritten by the second one.

6

Another thing to think about. If they are related data why aren’t they in the same database?