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Re^2: if table exists (DBI)

by erix (Vicar)
on Apr 26, 2013 at 16:47 UTC ( #1030864=note: print w/ replies, xml ) Need Help??


in reply to Re: if table exists (DBI)
in thread if table exists (DBI)

this is only valid for MySQL,

PostgreSQL has IF [NOT] EXISTS for many objects; also for TABLE:

$ psql psql (9.2.4) Type "help" for help. # CREATE TABLE IF NOT EXISTS my_table (foo INT, bar VARCHAR (25) ); CREATE TABLE # \d my_table Table "public.my_table" Column | Type | Modifiers --------+-----------------------+----------- foo | integer | bar | character varying(25) |

( So there is also: DROP <object> IF EXISTS ... ;

# drop table if exists my_table; -- exists DROP TABLE # drop table if exists my_table; -- no table is no problem: DROP TABLE #

)

Of course postgres can also ROLLBACK on DDL statements. Not many DBMS's implement *that*, I think.


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