[SQL]how to select * from database1 table,database2 table
if join database1 database2 how to make I use VB or DELPHI thanks
[SQL] C/C++ interface
Hello,
in the C interface documentation there is an example using:
res = PQexec(conn, "DECLARE mycursor CURSOR FOR select * from
pg_database");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "DECLARE CURSOR command failed\n");
PQclear(res);
exit_nicely(conn);
}
PQclear(res);
res = PQexec(conn, "FETCH ALL in mycursor");
...etc. So the statements are:
DECLARE mycursor CURSOR FOR select * from pg_database;
FETCH ALL in mycursor;
What's the difference between this and simply doing:
select * from pg_database;
I tried this in psql, the result seemed the same.
What I'm really using, however, is the C++ interface.
Its documentation is not yet complete.
There, too, I tried a version with and without cursor.
The result seems to be the same, but returned int is always 0
for the version without cursor, so I get no information whether
the query succeeded.
Is someone maintaining the C++ interface and its documentation?
Thanks,
Volker Paul
Re: [SQL]how to select * from database1 table,database2 table
From: "guard" <[EMAIL PROTECTED]> if join database1 database2 how to make I use VB or DELPHI You can't join between databases at present. I don't think this is in the pipeline for 7.2 even. The only solution I know of at present is to connect to two databases in the application and do the join "by hand" there. - Richard Huxton
[SQL] Inserting BLOB
Hi all,
I am using following query to create new type 'lo'
create type lo
(internallength=4,externallength=10,input=int4in,output=int4out,
default='',passedbyvalue);
i am trying to insert the image by following query:
insert into table (user_id,image) values
('som',lo_import('/u/grms/Import/XYZ.jpg'));
Here lo_import is used for oid but above type is 'lo' .
It is saying to cast the expression .
Tried by following query also.
insert into table (user_id,image) values ('som','XYZ.jpg');
But it is throwing pg_attoi error : can't parse ' XYZ.jpg'
Could anybody reply earliest with proper queries to insert, update and
delete an image from database.(Postgresql 7.0.0)
(with the help of lo type only)
thanks in advance,
som
Re: [SQL] ORDER BY in SQL functions
Tom Lane wrote: > > "K. Ari Krupnikov" <[EMAIL PROTECTED]> writes: > > CREATE FUNCTION foo (INT) > > RETURNS SETOF INT AS ' > > SELECT id > > FROM table > > WHERE some_colunm > $1 > > ORDER BY some_other_colunm > > ' LANGUAGE 'sql'; > > > ERROR: function declared to return int4 returns multiple values in > > final retrieve > > This is a bug in the SQL-function support --- the check for correct > return type gets confused by the extra hidden column used for the > ORDER BY. It'll work if you ORDER BY the column you're returning, > not that that helps you much. What if the function is declared to retun a complex type, can I then sort it? I it works, this function can be wrapped in another function that simply returns this single column. Also, why did I get this message after posting to comp.databases.postgresql.sql? Do articles in that group automatically get posted to the mailing list? > Subject: Stalled post to pgsql-sql > > Your message to pgsql-sql has been delayed > pending approval of the list owner for > the following reason(s): > > Non-Member Submission from "K. Ari Krupnikov" <[EMAIL PROTECTED]> -- K. Ari Krupnikov DBDOM - bridging XML and relational databases http://www.iter.co.il
Re: [SQL] C/C++ interface
Volker Paul <[EMAIL PROTECTED]> writes: > Is someone maintaining the C++ interface and its documentation? Not really. Feel free to step up and lend a hand ... regards, tom lane
Re: [SQL] C/C++ interface
Cursors and standard queries are pretty much the same, except the cursor
can control the rows returned.
> Hello,
>
> in the C interface documentation there is an example using:
>
> res = PQexec(conn, "DECLARE mycursor CURSOR FOR select * from
> pg_database");
> if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
> {
> fprintf(stderr, "DECLARE CURSOR command failed\n");
> PQclear(res);
> exit_nicely(conn);
> }
> PQclear(res);
> res = PQexec(conn, "FETCH ALL in mycursor");
>
> ...etc. So the statements are:
>
> DECLARE mycursor CURSOR FOR select * from pg_database;
> FETCH ALL in mycursor;
>
> What's the difference between this and simply doing:
> select * from pg_database;
>
> I tried this in psql, the result seemed the same.
>
> What I'm really using, however, is the C++ interface.
> Its documentation is not yet complete.
> There, too, I tried a version with and without cursor.
> The result seems to be the same, but returned int is always 0
> for the version without cursor, so I get no information whether
> the query succeeded.
>
> Is someone maintaining the C++ interface and its documentation?
>
>
> Thanks,
>
> Volker Paul
>
--
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[SQL] COPY isn't working right for me
I have a tab delimited file that I'm trying to import into an empty table. I've set the table up as follows: create table member ( member_id serial not null, fname varchar(25) not null, lname varchar(25) not null, member_since date not null, Primary Key (member_id) ); My member.txt file looks like this: Joe Smith 2000/01/14 Frank Jones 2000/06/21 MikeDavis 2000/09/24 Here's the copy command I use: COPY member FROM '/tmp/member.txt'; But I'm getting the following error: ERROR: copy: line 1, pg_atoi: error in "Joe": can't parse "Joe" I'm assuming this has to do with the member_id with type serial. How do I import into this without having to add the OID's to each of the rows in the text file? __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/
Re: [SQL] COPY isn't working right for me
Jeff S. writes: > create table member ( > member_id serial not null, > fname varchar(25) not null, > lname varchar(25) not null, > member_since date not null, > Primary Key (member_id) > ); > My member.txt file looks like this: > > Joe Smith 2000/01/14 > Frank Jones 2000/06/21 > Mike Davis 2000/09/24 > > Here's the copy command I use: > > COPY member FROM '/tmp/member.txt'; > > But I'm getting the following error: > ERROR: copy: line 1, pg_atoi: error in "Joe": can't > parse "Joe" > > I'm assuming this has to do with the member_id with > type serial. How do I import into this without having > to add the OID's to each of the rows in the text file? You can't, using COPY. You'll have to preprocess your file, either into INSERT statements, are prepend your own id's. -- Peter Eisentraut [EMAIL PROTECTED] http://yi.org/peter-e/
[SQL] constraint/restrict
hi there, with two tables i want to make some constraint-restrictions create table address ( id serial, country_id int4, ); and create table country (id serial, ...); to make sure that now country-row is deleted if there is still a country_id in address table. e.g. address: 1, 2, ... country: 2, ... now country wouldn't be allowed to be deleted. how to do that? thanks fo help olaf -- soli-con Engineering Zanger, Dipl.-Ing. (FH) Olaf Marc Zanger Lorrainestrasse 23, 3013 Bern / Switzerland fon:+41-31-332 9782, mob:+41-76-572 9782 mailto:[EMAIL PROTECTED], http://www.soli-con.com
