Thread: Retrieve rows 1 by 1

Please any one can tell me how to update,insert or change a single row
using libpq interface. The table is not indexed and do not have a
primary key.
Can any one give me a way to retrieve,chage or insert data after any
row.
Thanks in advance
Vikrant

Vikrant Rathore wrote:
>
> Please any one can tell me how to update,insert or change a single row
> using libpq interface. The table is not indexed and do not have a
> primary key.

each row has an unique 'object identifier' field called oid (that is
returned by a single-row insert if you use the psql interface)

so you can use where oid=NNNNN as qualification

Hannu

Vikrant Rathore wrote:

> Please any one can tell me how to update,insert or change a single row
> using libpq interface. The table is not indexed and do not have a
> primary key.
> Can any one give me a way to retrieve,chage or insert data after any
> row.
> Thanks in advance
> Vikrant

I am not familiar enough with libq to give you the specifics, but I think
the key is to realize that though you do not have primary key, every
object in a table has an oid (Object ID) that postgress assigns it that is
unique.  So when you do a select be sure to include the oid field, and
then you can update that specific record easily by specifying that"

    oid = ####

That is whatever number you pulled from the database with your select.  As
for the specifics the various docs on the website I believe describe the
libq interface very well (I just have never used it so I don't remember
it) so that you can fill in the specifics for yourself.

...james