Обсуждение: Sequence Manipulation Functions

Select last_value from your_sequence_name;

John

MG wrote:
> Hello,
>
> I use PostgreSQL 8.0.3.
>
> I want to get the information of the last value of a sequence.
>
> The function 'currval' only gives the value back, if before a nextval is executed.
> Return the value most recently obtained by nextval for this sequence in the current session. (An error is reported if
nextvalhas never been called for this sequence in this session.) Notice that because this is returning a session-local
value,it gives a predictable answer whether or not other sessions have executed nextval since the current session did.  
>
> But that is not very helpful.
>
> I noticed that the phpPgAdmin has that information
>
>       Name Last value Increment by Max value Min value Cache value Log count Is cycled? Is called?
>       adr_dsnr 108 1 9223372036854775807 1 1 25 No Yes
>
>
> So how can I get that information?
>
> Thanks
>
> Michaela
>
>
>
>
>

MG schrieb:
> Hello,
>
> I use PostgreSQL 8.0.3.
>
> I want to get the information of the last value of a sequence.
>
> The function 'currval' only gives the value back, if before a nextval is
> executed.
>
> /Return the value most recently obtained by |nextval| for this sequence
> in the current session. (An error is reported if |nextval| has never
> been called for this sequence in this session.) Notice that because this
> is returning a session-local value, it gives a predictable answer
> whether or not other sessions have executed |nextval| since the current
> session did./
>
> But that is not very helpful.
>
> I noticed that the phpPgAdmin has that information
>
> Name     Last value     Increment by     Max value     Min value     Cache value     Log
> count     Is cycled?     Is called?
> adr_dsnr     108     1     9223372036854775807     1     1     25     No     Yes
>
> So how can I get that information?
>
SELECT * FROM adr_dsnr;

Otoh, for what do you need this information?

Regards
Tino

On Jan 10 03:56, MG wrote:
> I noticed that the phpPgAdmin has that information
>
>       Name Last value Increment by Max value Min value Cache value Log count Is cycled? Is called?
>       adr_dsnr 108 1 9223372036854775807 1 1 25 No Yes

test=# \d roomsold_main_id_seq
Sequence "public.roomsold_main_id_seq"
    Column     |  Type
---------------+---------
 sequence_name | name
 last_value    | bigint
 increment_by  | bigint
 max_value     | bigint
 min_value     | bigint
 cache_value   | bigint
 log_cnt       | bigint
 is_cycled     | boolean
 is_called     | boolean

test=# \x
Expanded display is on.
test=# SELECT sequence_name, last_value, increment_by, max_value,
test-#        min_value, cache_value, log_cnt, is_cycled, is_called
test-# FROM roomsold_main_id_seq;
-[ RECORD 1 ]-+---------------------
sequence_name | roomsold_main_id_seq
last_value    | 1
increment_by  | 1
max_value     | 9223372036854775807
min_value     | 1
cache_value   | 1
log_cnt       | 1
is_cycled     | f
is_called     | f


HTH.
Regards.