Re: [GENERAL] want basic help with C

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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      before the LORD our maker."          Psalms 95:6