Re: Converting char to varchar automatically

[Melvin Davidson <melvin6925@xxxxxxxxx>]

Also, don't forget to test for relkind = 'r'. My bad from before.

Revised query is below.

SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
             || quote_ident(c.relname)
             || ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar;'
   FROM pg_class c
     JOIN pg_namespace n ON n.oid = c.relnamespace
     JOIN pg_attribute a ON a.attrelid = c.oid
     JOIN pg_type t ON t.oid = a.atttypid
WHERE t.typname = 'bpchar'
    AND c.relkind = 'r'
    AND n.nspname <> 'pg_catalog';

On Mon, Oct 6, 2014 at 6:18 PM, Jim Nasby <Jim.Nasby@xxxxxxxxxxxxxx> wrote:

On 10/6/14, 12:41 PM, hari.fuchs@xxxxxxxxx wrote:

Melvin Davidson <melvin6925@xxxxxxxxx> writes:

This query might work for you, but double check all result statements first.

SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.' ||
quote_ident(c.relname)
        || ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar;'
   FROM pg_class c
   JOIN pg_namespace n ON n.oid = c.relnamespace
   JOIN pg_attribute a ON a.attrelid = c.oid
   JOIN pg_type t ON t.oid = a.atttypid
  WHERE t.typname = 'char'
    AND n.nspname <> 'pg_catalog';

Make that "t.typname = 'bpchar'".

Just a heads-up: each of those ALTER's will rewrite the table, so unless your database is tiny this will be a slow process. There's ways to work around that, but they're significantly more complicated.

--
Jim Nasby, Data Architect, Blue Treble
Data in Trouble? Get it in Treble! http://BlueTreble.com



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Melvin Davidson
I reserve the right to fantasize.  Whether or not you
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