Re: [GENERAL] want basic help with C
От | Oliver Elphick |
---|---|
Тема | Re: [GENERAL] want basic help with C |
Дата | |
Msg-id | 1021987878.1400.23.camel@linda обсуждение исходный текст |
Ответ на | Re: want basic help with C (Arindam Haldar <arindamhaldar@hotpop.com>) |
Список | pgsql-interfaces |
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 GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C "O come, let us worship and bow down; let us kneel before the LORD our maker." Psalms 95:6
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