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TO_DATE()
and PgSQL extension FROM_CHAR().
TO_CHAR() routine allow formating text output with a datetime values:
SELECT TO_CHAR('now'::datetime, '"Now is: "HH24:MI:SS');
to_char
----------------
Now is: 21:04:10
FROM_CHAR() routine allow convert text to a datetime:
SELECT FROM_CHAR('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
from_char
-----------------------------
Wed Sep 01 10:20:30 1999 CEST
TO_DATE() is equal with FROM_CHAR(), but output a Date only:
SELECT TO_DATE('September 1999 10:20:30', 'FMMonth YYYY
HH:MI:SS');
to_date
----------
09-01-1999
In attache is compressed dir for the contrib. All is prepared, but I'am
not
sure if Makefile is good (probably yes).
Comments & suggestions ?
Thomas, thank you for your good advices.
Karel
------------------------------------------------------------------------------
Karel Zak <zakkr@zf.jcu.cz>
http://home.zf.jcu.cz/~zakkr/
34 lines
753 B
Plaintext
34 lines
753 B
Plaintext
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TO/FROM CHAR tests
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~~~~~~~~~~~~~~~~~~
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* rand_datetime
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The program 'rand_datetime' output a random datetime strings
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(with yaer range 0..9999), you can use this for datetime testing.
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You can usage this (example) for table filling.
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Usage:
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./rand_datetime <randfile> <num> <prefix> <postfix>
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Example:
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./rand_datetime /dev/urandom 2 "INSERT INTO tab VALUES('" "'::datetime);"
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INSERT INTO tab VALUES('Sat 27 Jul 13:08:57 19618'::datetime);
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INSERT INTO tab VALUES('Wed 25 Aug 20:31:50 27450'::datetime);
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* regress
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psql < regress.sql (all answers, must be TRUE, for Posgres
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datestyle)
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--> TO_DATE() is simular as FROM_CHAR(), but convert full datetime
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to date ==> needn't test (?).
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