Setting a default for nextval sequence

On Mon, Nov 27, 2017 at 12:13 PM, Robert Lakes <robertl@propaas.com> wrote:

I'm attempting to set the default value for a serial column. I created a
generic function that I am passing a table name as the only parameter. I
had it working correctly, however, it does not seem to like the sequence
name being the same name for each audit table that is created through the
function.
So I changed the code to include the table name as part of the naming
convention. Now, I need help on how to alter the serial column the new
value

EXECUTE 'CREATE SEQUENCE '|| t_name ||'tab_id_seq'|| ' OWNED BY '|| t_name
|| '_cdc'||'.table_id';

EXECUTE 'ALTER TABLE ' || quote_ident(t_name || '_cdc') || ' ALTER
COLUMN table_id SET DEFAULT nextval(''tab_id_seq'');';

​Not tested but:​

​EXECUTE format('CREATE SEQUENCE %I OWNED BY %I.table_id',
t_name || 'tab_id_seq',
t_name ||​ '_cdc');

EXECUTE format('ALTER TABLE %I ALTER COLUMN table_id SET DEFAULT
nextval(%L);',
t_name || '_cdc',
t_name || 'tab_id_seq');

​David J.

On Mon, Nov 27, 2017 at 2:24 PM, David G. Johnston <
david.g.johnston@gmail.com> wrote:

On Mon, Nov 27, 2017 at 12:13 PM, Robert Lakes <robertl@propaas.com>
wrote:

I'm attempting to set the default value for a serial column. I created a
generic function that I am passing a table name as the only parameter. I
had it working correctly, however, it does not seem to like the sequence
name being the same name for each audit table that is created through the
function.
So I changed the code to include the table name as part of the naming
convention. Now, I need help on how to alter the serial column the new
value

EXECUTE 'CREATE SEQUENCE '|| t_name ||'tab_id_seq'|| ' OWNED BY '||
t_name || '_cdc'||'.table_id';

EXECUTE 'ALTER TABLE ' || quote_ident(t_name || '_cdc') || ' ALTER
COLUMN table_id SET DEFAULT nextval(''tab_id_seq'');';

​Not tested but:​

​EXECUTE format('CREATE SEQUENCE %I OWNED BY %I.table_id',
t_name || 'tab_id_seq',
t_name ||​ '_cdc');

EXECUTE format('ALTER TABLE %I ALTER COLUMN table_id SET DEFAULT
nextval(%L);',
t_name || '_cdc',
t_name || 'tab_id_seq');

​David J.

*Do you mean ?*

*https://www.postgresql.org/docs/9.6/static/functions-sequence.html
<https://www.postgresql.org/docs/9.6/static/functions-sequence.html&gt;*

*SELECT setval(regclass, bigint) --- Set sequence's current value*

--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.