> Is there anyway I can change a field to allowing nulls without dumping the table, dropping it,
> recreating it as desired, and filling all the data back in?
I hope this gets indexed correctly as I hosed the original and tried a cut-n-paste of the subject line,
For that, I have this which I didn't write myself but snagged from somewhere. Maybe pgsql-general???
-- This function takes a table and column and will set the column
-- to allow NULLs.
DROP FUNCTION kl_setnull(name, name);
CREATE FUNCTION kl_setnull(name, name) RETURNS boolean AS '
tablename ALIAS FOR $1;
colname ALIAS FOR $2;
-- If any params are NULL, return NULL - this means function
-- can be defined isstrict.
IF tablename IS NULL OR colname IS NULL THEN
-- Lock table with standard ALTER TABLE locks
EXECUTE ''LOCK TABLE '' || quote_ident(tablename) || '' IN ACCESS EXCLUSIVE MODE'';
-- Update the system catalogs
EXECUTE ''UPDATE pg_attribute SET attnotnull = false WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = '' || quote_literal(tablename) || '') AND attname = '' || quote_literal(colname);
-- Get number of rows modified
GET DIAGNOSTICS rec_affected = ROW_COUNT;
-- Return number of rows modified
RETURN (rec_affected = 1);
' LANGUAGE 'plpgsql'
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|Subject: Re: Changing from NOT NULL to NULL|