want basic help with C

Arindam Haldar wrote:
hi,
i went thru the docs on programming interface of postgresql with c. But
am unable to understnad to use the interface to query a select
statement. the database is--->masterdb & in it there is a table
-->colleges with a few columns & a few records for testing..
now i want to use a general select statement--> select * from colleges,
but going thru the docs again & again from different sites am unable to
undestand how to use it.
can u gove me a basics to use the funstion to use the same & print the
rows in the tables

thanking in advance
A.H

pls--> i wanted to ask this 2nd Question-->is it necessary to start
postgreswith option -i too to accept connection from localhost(C
programme). command line works fine without the said option but unless i
use -i , i cannot connect to postgres.

On Tue, 2002-05-21 at 13:34, Arindam Haldar wrote:

Arindam Haldar wrote:
hi,
i went thru the docs on programming interface of postgresql with c. But

This is the libpq interface, yes?

You need to read the libpq reference: chapter 1 of the Programmer's
Guide.

am unable to understnad to use the interface to query a select
statement. the database is--->masterdb & in it there is a table
-->colleges with a few columns & a few records for testing..
now i want to use a general select statement--> select * from colleges,
but going thru the docs again & again from different sites am unable to
undestand how to use it.
can u gove me a basics to use the funstion to use the same & print the
rows in the tables

First you have to connect to the database, using PQconnectdb() or a
related function. This returns a handle which you have to use in all
other API calls for this connection.

Send your command or query to the backend with PQExec()
This returns a query handle which you can use to get the results with
the various calls listed in section 1.3.4 of the Programmer's Guide.

Close the connection with PQfinish()

pls--> i wanted to ask this 2nd Question-->is it necessary to start
postgreswith option -i too to accept connection from localhost(C
programme). command line works fine without the said option but unless i
use -i , i cannot connect to postgres.

If you connect through TCP/IP you always need the -i option on the
postmaster. Connecting with host set to localhost is a TCP/IP
connection. Connecting with host set to nothing connects through a Unix
socket on the local machine; this does not need the -i option.

--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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