Re: Setting a default for nextval sequence

[Melvin Davidson <melvin6925@xxxxxxxxx>]

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

On Mon, Nov 27, 2017 at 12:13 PM, Robert Lakes <robertl@xxxxxxxxxxx> 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

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

--

Melvin Davidson
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