Re: Creating DB programmatically? - Mailing list pgsql-novice

Step 1 connect to user using maintenance db "ie postgres"

Step 2 check whether database exists or not "SELECT 1 AS result FROM pg_database 

WHERE datname='abc'"

Step 3 if not run "create database ...."

simple..

On 12 July 2011 17:14, Frank Bax <fbax@sympatico.ca> wrote:

On 07/12/11 03:31, Roy's Email wrote:

Now I am particularly confused.  How do I issue "CREATE DATABASE ..."
from my program? I thought that I needed a connection (PGconn) before I
could execute a command and I don't believe I have a valid connection if
my attempt to connect to a (non-existent) DB fails. [Does it change
anything that I'm writing in C++ and using the 'libpq' interface?]

Let's assume for the moment; that you know how to connect to an existing database and execute an SQL command like "SELECT ....".

Simply modify your code:
* change your connect command so it connects to "template1"
* change your "SELECT ..." statement to "CREATE DATABASE ..."
* close the connection and make a connection to database just created.



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