Re: Connection string - Mailing list pgsql-general
| From | Harpreet Dhaliwal |
|---|---|
| Subject | Re: Connection string |
| Date | |
| Msg-id | d86a77ef0608100857k546bc1dbld9e76ff2219fe553@mail.gmail.com Whole thread Raw |
| In response to | Re: Connection string (Michael Fuhr <mike@fuhr.org>) |
| Responses |
Re: Connection string
(Michael Fuhr <mike@fuhr.org>)
Re: Connection string (Michael Meskes <meskes@postgresql.org>) |
| List | pgsql-general |
This is a simple code snippet that i've written to check if i can connect to the postgres database server residing at IP 192.168.0.123. DB name is xyz
Also, user account jsb has the access to the database xyz.
------------------------------------------------------------
#include <stdio.h>
EXEC SQL INCLUDE sqlca
int main ()
{
EXEC SQL BEGIN DECLARE SECTION;
char abc[20];
EXEC SQL END DECLARE SECTION;
EXEC SQL CONNECT TO 'tcp:postgresql://192.168.0.123/xyz' USER jsb
printf("Error code is: %d ", SQLCODE);
}
---------------------------------------------------------------------------------------------------------------------------
The error code that it gives me is -402 that means it could not establish the connection.
Don't know whats going wrong.
Thanks,
Harpreet.
On 8/10/06, Michael Fuhr <mike@fuhr.org> wrote:
On Thu, Aug 10, 2006 at 12:02:24AM -0400, Harpreet Dhaliwal wrote:
> I already read that documentation.
>
> My ECPG code for connecting to the DB server is:
>
> EXEC SQL CONNECT TO 192.168.1.100:/xyz
That format isn't shown in the documentation; the ecpg preprocessor
should fail with a syntax error if you try using it.
> i also tried
>
> tcp:postgresql://192.168.1.100[:*port*][/*dbname*][?*options*]
The above is probably what you need, but without seeing the exact
code you tried it's hard to say why it's not working.
> unix:postgresql://*192.168.1.100*[:*port*][/*dbname*][?*options*]
The ecpg preprocessor shouldn't allow this -- it should fail with
an error like "unix domain sockets only work on 'localhost' but not
on '192.168.1.100'".
> but unfortunately it say DB doesn't exist.
Are you sure the database exists? Can you connect to it with
psql?
> I don't know the right way to use IP addresses while connecting to a
> postgres DB using ECPG.
If you have a server on 192.168.1.100 listening on the default port
(5432, or whatever PGPORT is set to) and you want to connect to a
database named "mydb" on that server, then the following should
work:
EXEC SQL CONNECT TO tcp:postgresql://192.168.1.100/mydb;
If the database is listening on another port, say 12345, then
this should work:
EXEC SQL CONNECT TO tcp:postgresql://192.168.1.100:12345/mydb;
If you're getting 'database "mydb" does not exist' errors then try
connecting with psql and make sure the database really does exist.
If you still have trouble then please post a minimal but complete
program so we can see everything you're doing.
--
Michael Fuhr
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