Re: Transactional DDL

On Jun 2, 2007, at 10:12 , Jasbinder Singh Bali wrote:

> But its said that transactions in any RDBMS follow ACID properties.
> So if i put a create table and an Insert statement in the same
> begin end block as one single transactioin, won't both create and
> insert follow acid property, being in one single trasaction, and
> either both get committed or none, talking about oracle lets say

test=# \d
         List of relations
Schema | Name | Type  |  Owner
--------+------+-------+----------
public | a    | table | postgres
public | b    | table | postgres
(2 rows)

test=# begin;
BEGIN
test=# create table foo (a integer);
CREATE TABLE
test=# insert into foo (a) values (1);
INSERT 0 1
test=# commit;
COMMIT
test=# \d
         List of relations
Schema | Name | Type  |  Owner
--------+------+-------+----------
public | a    | table | postgres
public | b    | table | postgres
public | foo  | table | postgres
(3 rows)

test=# select * from foo;
a
---
1
(1 row)

test=# begin;
BEGIN
test=# create table bar (a integer);
CREATE TABLE
test=# insert into bar (a) values (1);
INSERT 0 1
test=# select * from bar;
a
---
1
(1 row)

test=# \d
         List of relations
Schema | Name | Type  |  Owner
--------+------+-------+----------
public | a    | table | postgres
public | b    | table | postgres
public | bar  | table | postgres
public | foo  | table | postgres
(4 rows)

test=# select 1/0;
ERROR:  division by zero
test=# commit;
ROLLBACK
test=# \d
         List of relations
Schema | Name | Type  |  Owner
--------+------+-------+----------
public | a    | table | postgres
public | b    | table | postgres
public | foo  | table | postgres
(3 rows)


Michael Glaesemann
grzm seespotcode net