El día jueves, noviembre 07, 2019 a las 12:39:39p. m. +0100, Matthias Apitz escribió:
>
> Hello,
>
> We're struggling with the following problem (here show in a simplified
> case).
>
> We have in a PG 11.4 database a table with two columns: SERIAL, VARCHAR(11).
>
> In the ESQL/C pgm the code is:
>
> EXEC SQL BEGIN DECLARE SECTION;
> ...
> struct {
> int ser;
> char name [11];
> } host_struct;
> EXEC SQL END DECLARE SECTION;
>
> an INSERT with
>
> strcpy(host_struct.name, "Sigrid");
> host_struct.ser = 0;
>
> EXEC SQL INSERT INTO lina VALUES (:host_struct);
>
> works but, sets the SERIAL column to 0;
>
> an INSERT with
>
> EXEC SQL INSERT INTO lina VALUES (DEFAULT, :host_struct.name);
>
> works correctly and increments the SERIAL on every INSERT:
At the end of the day we came up with the following solution:
strcpy(host_struct.name, "Sigrid");
EXEC SQL select nextval('lina_lid_seq') into :host_struct.ser;
EXEC SQL INSERT INTO lina VALUES ( :host_struct );
which seems to work fine. Any comments about side effects?
The layout of the table 'lina' is ( serial lid, varchar name )
Thanks,
matthias
--
Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub
"Glaube wenig, hinterfrage alles, denke selbst: Wie man Manipulationen durchschaut"
"Believe little, scrutinise all, think by your own: How see through manipulations"
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