This is my first 'real' script, one that verifies proper format for a
user-entered date string.
Once that is done I want the script to return the UNIX time.

I plan on invoking this script on a psql connection (via .psqlrc), so
that I can call it from the command line.

Here's what I have at the end of my script,
************************************

-- ==========================================
good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;

RAISE NOTICE 'good_date = %',good_date ;

Usecs := EXTRACT(EPOCH FROM TIMESTAMP good_date) ;

END ;


Here's what I get when I
*********************

psql -U username dbname -f myfile.sql
CREATE FUNCTION
psql:myfile.sql:119: ERROR: syntax error at or near "$1"
LINE 1: SELECT EXTRACT(EPOCH FROM TIMESTAMP $1 )
^
QUERY: SELECT EXTRACT(EPOCH FROM TIMESTAMP $1 )
CONTEXT: SQL statement in PL/PgSQL function "usecs_from_date" near
line 92

Is this not a programmable extraction???
I'm missing something here.

Thanks!
Ralph

On Wed, 4 Jun 2008, Ralph Smith wrote:

> -- ==========================================
> good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
> RAISE NOTICE 'good_date = %',good_date ;
> Usecs := EXTRACT(EPOCH FROM TIMESTAMP good_date) ;
> END ;
>

> QUERY: SELECT EXTRACT(EPOCH FROM TIMESTAMP $1 )
> CONTEXT: SQL statement in PL/PgSQL function "usecs_from_date" near
> line 92
>
> Is this not a programmable extraction???
> I'm missing something here.

TIMESTAMP '...' describes a timestamp literal.

If you wanted to explicitly cast the value in good_date as a timestamp,
you'd probably want CAST(good_date AS TIMESTAMP).

If good_date is of type date, however, I believe the cast to timestamp is
implicit, so you should probably be able to just use extract(epoch from
good_date).

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On Jun 4, 2008, at 2:56 PM, Stephan Szabo wrote:

>
> On Wed, 4 Jun 2008, Ralph Smith wrote:
>
>> -- ==========================================
>> good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
>> RAISE NOTICE 'good_date = %',good_date ;
>> Usecs := EXTRACT(EPOCH FROM TIMESTAMP good_date) ;
>> END ;
>>
>
>> QUERY: SELECT EXTRACT(EPOCH FROM TIMESTAMP $1 )
>> CONTEXT: SQL statement in PL/PgSQL function "usecs_from_date" near
>> line 92
>>
>> Is this not a programmable extraction???
>> I'm missing something here.
>
> =============================

> TIMESTAMP '...' describes a timestamp literal.
>
> If you wanted to explicitly cast the value in good_date as a
> timestamp,
> you'd probably want CAST(good_date AS TIMESTAMP).
>
> If good_date is of type date, however, I believe the cast to
> timestamp is
> implicit, so you should probably be able to just use extract(epoch
> from
> good_date).


=============================================

Well I cleaned things up a bit, but I'm still getting stuck on that
EXTRACT command:
The following is the script in file: library_date.sql

CREATE OR REPLACE FUNCTION usecs_from_date(given_date varchar) RETURNS
int AS
$$

/* given_date Must be of the format 'YYYY-MM-DD', however single digit
months and days are allowed (are handled here).
If a single digit year is used then this function
will assume 200X as the year.
If a double digit year is used then numbers >= 70 are
assumed to be 19XX.
Three digit years are not allowed.
*/

DECLARE
year varchar ;
month varchar ;
day varchar ;
pslash1 int ;
pslash2 int ;
year_len int ;
month_len int ;
day_len int ;
date_string varchar ;
good_date timestamp ;
UsecsD double precision ;
Usecs int ;

BEGIN

-- CLEANSING CODE HERE

-- ==========================================
date_string := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;

RAISE INFO 'date_string = %', date_string ;

good_date := to_timestamp(date_string, 'YYYY-MM-DD') ;

RAISE INFO 'good_date = %', good_date ;

UsecsD := EXTRACT(EPOCH FROM TIMESTAMP 'good_date') ;

Usecs := CAST(UsecsD AS INT) ;

RETURN Usecs ;

END ;

$$ LANGUAGE plpgsql ;

*****************************
This is what I'm getting now
*****************************

smithrn@flexo:~/PL-SQL$ psql -U airburst airburst
Welcome to psql 8.2.6, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit

airburst=# \i misc.sql \i library_date.sql
CREATE FUNCTION
CREATE FUNCTION
airburst=# select usecs_from_date('2008-06-04');
INFO: date_string = 2008-06-04
INFO: good_date = 2008-06-04 00:00:00
ERROR: invalid input syntax for type timestamp: "good_date"
CONTEXT: SQL statement "SELECT EXTRACT(EPOCH FROM TIMESTAMP
'good_date')"
PL/pgSQL function "usecs_from_date" line 96 at assignment
airburst=#

On Wed, 4 Jun 2008, Ralph Smith wrote:

> date_string := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
> RAISE INFO 'date_string = %', date_string ;
> good_date := to_timestamp(date_string, 'YYYY-MM-DD') ;
> RAISE INFO 'good_date = %', good_date ;

This seems like alot of extra work, due to the implicit cast from date to
timestamp. I think
good_date := to_date(year || '-' || month || '-' || day, 'YYYY-MM-DD')
might work and just be simpler.

> UsecsD := EXTRACT(EPOCH FROM TIMESTAMP 'good_date') ;

If good_date's already a timestamp, I think this should just be:
EXTRACT(EPOCH FROM good_date)

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Same problem, see below
--------------------------------
On Jun 4, 2008, at 3:30 PM, Stephan Szabo wrote:

> On Wed, 4 Jun 2008, Ralph Smith wrote:
>
>> date_string := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
>> RAISE INFO 'date_string = %', date_string ;
>> good_date := to_timestamp(date_string, 'YYYY-MM-DD') ;
>> RAISE INFO 'good_date = %', good_date ;
>
> This seems like alot of extra work, due to the implicit cast from
> date to
> timestamp. I think
> good_date := to_date(year || '-' || month || '-' || day, 'YYYY-MM-DD')
> might work and just be simpler.
>
>> UsecsD := EXTRACT(EPOCH FROM TIMESTAMP 'good_date') ;
>
> If good_date's already a timestamp, I think this should just be:
> EXTRACT(EPOCH FROM good_date)

=========================================

*************************
The code:

DECLARE
year varchar ;
month varchar ;
day varchar ;
pslash1 int ;
pslash2 int ;
year_len int ;
month_len int ;
day_len int ;
date_string varchar ;
good_date date ;
UsecsD double precision ;
Usecs int ;

BEGIN

-- My cleansing code here

-- ==========================================
good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;

RAISE INFO 'good_date = %', good_date ;

UsecsD := EXTRACT(EPOCH FROM DATE 'good_date') ;

Usecs := CAST(UsecsD AS INT) ;

RETURN Usecs ;

END ;

$$ LANGUAGE plpgsql ;

-
*************************
Here's what I'm getting now:

smithrn@flexo:~/PL-SQL$ psql -U airburst airburst
Welcome to psql 8.2.6, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit

airburst=# \i misc.sql \i library_date.sql
CREATE FUNCTION
CREATE FUNCTION

airburst=# select usecs_from_date('2008-06-04');
INFO: good_date = 2008-06-04
ERROR: invalid input syntax for type date: "good_date"
CONTEXT: SQL statement "SELECT EXTRACT(EPOCH FROM DATE 'good_date')"
PL/pgSQL function "usecs_from_date" line 92 at assignment
airburst=#




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Try doing what was suggested ?

Greg Williamson
Senior DBA
DigitalGlobe

Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information and must be protected in accordance with those provisions. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.

(My corporate masters made me say this.)



-----Original Message-----
From: pgsql-general-owner@postgresql.org on behalf of Ralph Smith
Sent: Wed 6/4/2008 4:04 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Script errors on run

Same problem, see below
--------------------------------
On Jun 4, 2008, at 3:30 PM, Stephan Szabo wrote:

> On Wed, 4 Jun 2008, Ralph Smith wrote:
>
>> date_string := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
>> RAISE INFO 'date_string = %', date_string ;
>> good_date := to_timestamp(date_string, 'YYYY-MM-DD') ;
>> RAISE INFO 'good_date = %', good_date ;
>
> This seems like alot of extra work, due to the implicit cast from
> date to
> timestamp. I think
> good_date := to_date(year || '-' || month || '-' || day, 'YYYY-MM-DD')
> might work and just be simpler.
>
>> UsecsD := EXTRACT(EPOCH FROM TIMESTAMP 'good_date') ;
>
> If good_date's already a timestamp, I think this should just be:
> EXTRACT(EPOCH FROM good_date)

=========================================

*************************
The code:

DECLARE
year varchar ;
month varchar ;
day varchar ;
pslash1 int ;
pslash2 int ;
year_len int ;
month_len int ;
day_len int ;
date_string varchar ;
good_date date ;
UsecsD double precision ;
Usecs int ;

BEGIN

-- My cleansing code here

-- ==========================================
good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;

RAISE INFO 'good_date = %', good_date ;

UsecsD := EXTRACT(EPOCH FROM DATE 'good_date') ;

Usecs := CAST(UsecsD AS INT) ;

RETURN Usecs ;

END ;

$$ LANGUAGE plpgsql ;

-
*************************
Here's what I'm getting now:

smithrn@flexo:~/PL-SQL$ psql -U airburst airburst
Welcome to psql 8.2.6, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit

airburst=# \i misc.sql \i library_date.sql
CREATE FUNCTION
CREATE FUNCTION

airburst=# select usecs_from_date('2008-06-04');
INFO: good_date = 2008-06-04
ERROR: invalid input syntax for type date: "good_date"
CONTEXT: SQL statement "SELECT EXTRACT(EPOCH FROM DATE 'good_date')"
PL/pgSQL function "usecs_from_date" line 92 at assignment
airburst=#




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I do believe I did.
I tired with and w/o the DATE word in the EXTRACT statement.
Without the DATE I get:
-----------------------------
airburst=# select usecs_from_date('2008-06-04');
INFO: good_date = 2008-06-04
ERROR: function pg_catalog.date_part("unknown", "unknown") is not
unique
LINE 1: SELECT EXTRACT(EPOCH FROM 'good_date')
^
HINT: Could not choose a best candidate function. You may need to add
explicit type casts.
QUERY: SELECT EXTRACT(EPOCH FROM 'good_date')
CONTEXT: PL/pgSQL function "usecs_from_date" line 92 at assignment

-----------------------------
Though I do have a cold and I just called my own # thinking I was
calling someone else.

I've tried MANY variations and yet I still get this same error.

Please keep sending your suggestions.
(I'm beginning to think this is like programming javascript. The code
is right but the interpreter doesn't think so.)

Thanks all,
Ralph
==================================
On Jun 4, 2008, at 4:18 PM, GW wrote:
>
> -----Original Message-----
> From: pgsql-general-owner@postgresql.org on behalf of Ralph Smith
> Sent: Wed 6/4/2008 4:04 PM
> To: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] Script errors on run
>
> Same problem, see below
> --------------------------------
> On Jun 4, 2008, at 3:30 PM, Stephan Szabo wrote:
>
> > On Wed, 4 Jun 2008, Ralph Smith wrote:
> >
> >> date_string := to_date(year||'-'||month||'-'||day , 'YYYY-MM-
> DD') ;
> >> RAISE INFO 'date_string = %', date_string ;
> >> good_date := to_timestamp(date_string, 'YYYY-MM-DD') ;
> >> RAISE INFO 'good_date = %', good_date ;
> >
> > This seems like alot of extra work, due to the implicit cast from
> > date to
> > timestamp. I think
> > good_date := to_date(year || '-' || month || '-' || day, 'YYYY-MM-
> DD')
> > might work and just be simpler.
> >
> >> UsecsD := EXTRACT(EPOCH FROM TIMESTAMP 'good_date') ;
> >
> > If good_date's already a timestamp, I think this should just be:
> > EXTRACT(EPOCH FROM good_date)
>
> =========================================
>
> *************************
> The code:
>
> DECLARE
> year varchar ;
> month varchar ;
> day varchar ;
> pslash1 int ;
> pslash2 int ;
> year_len int ;
> month_len int ;
> day_len int ;
> date_string varchar ;
> good_date date ;
> UsecsD double precision ;
> Usecs int ;
>
> BEGIN
>
> -- My cleansing code here
>
> -- ==========================================
> good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
>
> RAISE INFO 'good_date = %', good_date ;
>
> UsecsD := EXTRACT(EPOCH FROM DATE 'good_date') ;
>
> Usecs := CAST(UsecsD AS INT) ;
>
> RETURN Usecs ;
>
> END ;
>
> $$ LANGUAGE plpgsql ;
>
> -
> *************************
> Here's what I'm getting now:
>
> smithrn@flexo:~/PL-SQL$ psql -U airburst airburst
> Welcome to psql 8.2.6, the PostgreSQL interactive terminal.
>
> Type: \copyright for distribution terms
> \h for help with SQL commands
> \? for help with psql commands
> \g or terminate with semicolon to execute query
> \q to quit
>
> airburst=# \i misc.sql \i library_date.sql
> CREATE FUNCTION
> CREATE FUNCTION
>
> airburst=# select usecs_from_date('2008-06-04');
> INFO: good_date = 2008-06-04
> ERROR: invalid input syntax for type date: "good_date"
> CONTEXT: SQL statement "SELECT EXTRACT(EPOCH FROM DATE 'good_date')"
> PL/pgSQL function "usecs_from_date" line 92 at assignment
> airburst=#
>
>
>
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
>
>

I've tried SO MANY variations of w/ and w/o the apostrophes, but
apparently not just the right one.

As you knew and I doubted, it NOW WORKS!

Whew!
You can bet that I'm keeping this snippet of code handy.

Thank you very much,
Ralph
==================================
On Jun 4, 2008, at 4:34 PM, Stephan Szabo wrote:

> On Wed, 4 Jun 2008, Ralph Smith wrote:
>
>> -- ==========================================
>> good_date := to_date(year||'-'||month||'-'||day , 'YYYY-MM-DD') ;
>>
>> RAISE INFO 'good_date = %', good_date ;
>>
>> UsecsD := EXTRACT(EPOCH FROM DATE 'good_date') ;
>
> You want something like:
> UsecsD := EXTRACT(EPOCH FROM good_date);
>
> Note the lack of single quotes. You want to use the variable's
> value, not
> a literal string with the value 'good_date'.


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