I finish devel. of Oracle compatible DateTime routines TO_CHAR(),
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/
This commit is contained in:
Bruce Momjian
parent
1f747c6722
commit
1c5aec60bb
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@ -10,6 +10,14 @@ array -
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Array iterator functions
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by Massimo Dal Zotto <dz@cs.unitn.it>
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bit -
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Bit type
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by Adriaan Joubert <a.joubert@albourne.com>
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dateformat -
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Date Formatting to/from character strings
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by Karel Zak - Zakkr <zakkr@zf.jcu.cz>
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datetime -
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Date & time functions
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by Massimo Dal Zotto <dz@cs.unitn.it>
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@ -0,0 +1,71 @@
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#-------------------------------------------------------------------------
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#
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# Makefile --
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#
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# Makefile for TO-FROM_CHAR module.
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#
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#-------------------------------------------------------------------------
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PGDIR = ../..
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SRCDIR = $(PGDIR)/src
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include $(SRCDIR)/Makefile.global
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INCLUDE_OPT = -I ./ \
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-I $(SRCDIR)/ \
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-I $(SRCDIR)/include \
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-I $(SRCDIR)/port/$(PORTNAME)
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CFLAGS += $(INCLUDE_OPT) $(CFLAGS_SL)
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MODNAME = to-from_char
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SQLDEFS = $(MODNAME).sql
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MODULE = $(MODNAME)$(DLSUFFIX)
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MODDIR = $(LIBDIR)/modules
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SQLDIR = $(LIBDIR)/sql
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all: module sql
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module: $(MODULE)
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sql: $(SQLDEFS)
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install: $(MODULE) $(SQLDEFS) $(MODDIR) $(SQLDIR)
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cp -p $(MODULE) $(MODDIR)/
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strip $(MODDIR)/$(MODULE)
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cp -p $(SQLDEFS) $(SQLDIR)/
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install-doc:
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if [ -d "$(DOCDIR)" ]; then \
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cp -p *.doc $(DOCDIR); \
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else \
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cp -p *.doc $(SQLDIR); \
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fi
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$(MODDIR):
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mkdir -p $@
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$(SQLDIR):
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mkdir -p $@
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%.sql: %.sql.in
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sed "s|MODULE_PATHNAME|$(MODDIR)/$(MODULE)|" < $< > $@
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.SUFFIXES: $(DLSUFFIX)
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%$(DLSUFFIX): %.c
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$(CC) $(CFLAGS) -shared -o $@ $<
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depend dep:
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$(CC) -MM $(INCLUDE_OPT) *.c >depend
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clean:
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rm -f *~ $(MODULE) $(MODNAME).sql
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ifeq (depend,$(wildcard depend))
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include depend
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endif
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@ -0,0 +1,25 @@
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PROGRAM = rand_datetime
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OBJECTS = rand_datetime.o
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CFLAGS = -Wall -fpic -O3
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CC = gcc
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RM = rm -f
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LIBS =
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INCLUDE =
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COMPILE = $(CC) $(CPPFLAGS) $(CFLAGS) $(INCLUDE)
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LINK = $(CC) $(CFLAGS) -o $@ $(LIBS)
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all: $(PROGRAM)
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$(PROGRAM): $(OBJECTS)
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$(LINK) $(OBJECTS)
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.c.o: $<
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$(COMPILE) -c $<
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clean:
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$(RM) -f *~ $(OBJECTS) $(PROGRAM)
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@ -0,0 +1,33 @@
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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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@ -0,0 +1,71 @@
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdlib.h>
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char *month[] = {
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"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec",NULL
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};
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char *day[] = { "Sun","Mon","Tue","Wed","Thu","Fri","Sat", NULL };
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int num(FILE *f, int min, int max)
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{
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int x, y, one;
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one = x = fgetc(f);
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if (x < min)
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x = min;
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else if (x > max) {
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while(x > max)
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x /= 2;
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return x;
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}
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do {
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y = fgetc(f);
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if ((x+y) > max)
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return x;
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x += y;
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} while(--one > 0);
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return x;
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}
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int main(int argc, char **argv)
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{
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FILE *f;
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int count;
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if (argc < 5) {
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printf("\nUsage: %s <randfile> <num> <prefix> <postfix>\n", argv[0]);
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printf("\n(C) Karel Zak - Zakkr 1999\n\n");
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exit(1);
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}
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if ((f = fopen(argv[1], "r")) == NULL) {
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perror(argv[1]);
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exit(1);
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}
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count = atoi(argv[2]);
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for(; count > 0; --count) {
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fprintf(stdout, "%s%s %02d %s %02d:%02d:%02d %d%s\n",
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argv[3],
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day[ num(f, 0, 6) ],
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num(f, 1, 28),
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month[ num(f, 0, 11) ],
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num(f, 0, 23),
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num(f, 0, 59),
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num(f, 0, 59),
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num(f, 0, 9999),
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argv[4]
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);
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}
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exit(0);
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}
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@ -0,0 +1,58 @@
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---
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--- Postgres DateStyle needs all tests which parsing 'now'::datetime string
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---
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SET DATESTYLE TO 'Postgres';
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SELECT 'now'::datetime =
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TO_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')::datetime
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as "Now vs. to_char";
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SELECT 'now'::datetime =
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FROM_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')
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as "Now vs. from_char";
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SELECT FROM_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY') =
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TO_CHAR('now'::datetime, 'Dy Mon DD HH24:MI:SS YYYY')::datetime
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as "From_char vs. To_char";
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SELECT 'now'::datetime =
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FROM_CHAR(
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TO_CHAR('now'::datetime, '"Time: "HH24-MI-SS" Date: "Dy DD Mon YYYY'),
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'"Time: "HH24-MI-SS" Date: "Dy DD Mon YYYY'
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)
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as "High from/to char test";
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SELECT TO_CHAR('now'::datetime, 'SSSS')::int =
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TO_CHAR('now'::datetime, 'HH24')::int * 3600 +
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TO_CHAR('now'::datetime, 'MI')::int * 60 +
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TO_CHAR('now'::datetime, 'SS')::int
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as "SSSS test";
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SELECT TO_CHAR('now'::datetime, 'WW')::int =
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(TO_CHAR('now'::datetime, 'DDD')::int -
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TO_CHAR('now'::datetime, 'D')::int + 7) / 7
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as "Week test";
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SELECT TO_CHAR('now'::datetime, 'Q')::int =
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TO_CHAR('now'::datetime, 'MM')::int / 3 + 1
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as "Quartal test";
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SELECT TO_CHAR('now'::datetime, 'DDD')::int =
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(TO_CHAR('now'::datetime, 'WW')::int * 7) -
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(7 - TO_CHAR('now'::datetime, 'D')::int) +
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(7 - TO_CHAR(('01-Jan-'||
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TO_CHAR('now'::datetime,'YYYY'))::datetime,'D')::int)
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+1
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as "Week and day test";
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,183 @@
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TO_CHAR(datetime, text)
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-----------------------
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(returns text)
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TO_CHAR - the DateTime function for formating date and time outputs.
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This routine is inspire with the Oracle to_char().
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SELECT TO_CHAR('now'::datetime, 'HH:MI:SS YYYY');
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-------------
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11:57:11 1999
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FROM_CHAR(text, text)
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---------------------
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(returns DateTime)
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FROM_CHAR - the PostgreSQL extension routine which read non-datetime
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string and convert it to DateTime. This func. is inspire with the
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Oracle to_date() routine, but in Oracle this func. return date only
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and not support all keywords (format pictures).
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SELECT FROM_CHAR('11:57:11 1999', 'HH:MI:SS YYYY');
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----------------------------
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Fri 01 Jan 11:57:11 1999 CET
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TO_DATE(text, text)
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-------------------
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(returns Date)
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TO_DATE - the Date function which read non-datetime (non-date) string
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and convert it to date. All for thos func. is just as from_char().
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This func. is inspire with the Oracle to_date() routine.
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SELECT TO_DATE('11:57:11 1999', 'HH:MI:SS YYYY');
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----------
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01-01-1999
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----------------------------------
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String format-KeyWords and options:
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----------------------------------
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* TO_CHAR (..., 'format picture')
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* FROM_CHAR (..., 'format picture')
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* TO_DATE (..., 'format picture')
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(Note: In Oracle manual is format-keyword called 'format pictures'.)
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All keywords has suffixes (prefix or postfix), example for 2 hours:
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keyword: HH (hour) 'HH' --> '02'
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prefix: FM (fill mode) 'FMHH' --> '2'
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postfix: TH (ordinal number) 'HHth' --> '02nd'
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'FMHHth' --> '2nd'
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Suffixes:
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--------
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FM - fill mode
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02 --> FMHH --> 2
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January , --> FMMonth --> January,
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TH - upper ordinal number
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02 --> HHTH --> 02ND
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th - lower ordinal number
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02 --> HHth --> 02th
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KeyWords (format pictures):
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--------------------------
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HH - hour of day (01-12)
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HH12 - -- // --
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HH24 - hour (00-24)
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MI - minute (00-59)
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SS - socond (00-59)
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SSSS - seconds past midnight (0-86399)
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Y,YYY - year with comma (full PgSQL datetime range) digits)
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YYYY - year (4 and more (full PgSQL datetime range) digits)
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YYY - last 3 digits of year
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YY - last 2 digits of year
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Y - last digit of year
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MONTH - full month name (upper) (9-letters)
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Month - full month name - first character is upper (9-letters)
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month - full month name - all characters is upper (9-letters)
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MON - abbreviated month name (3-letters)
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Mon - abbreviated month name (3-letters) - first character is upper
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mon - abbreviated month name (3-letters) - all characters is upper
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MM - month (01-12)
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DAY - full day name (upper) (9-letters)
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Day - full day name - first character is upper (9-letters)
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day - full day name - all characters is upper (9-letters)
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DY - abbreviated day name (3-letters) (upper)
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Dy - abbreviated day name (3-letters) - first character is upper
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Dy - abbreviated day name (3-letters) - all character is upper
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DDD - day of year (001-366)
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DD - day of month (01-31)
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D - day of week (1-7; SUN=1)
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WW - week number of year
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CC - century (2-digits)
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Q - quarter
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RM - roman numeral month (I=JAN; I-XII)
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W - week of month
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J - julian day (days since January 1, 4712 BC)
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AC / BC:
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-------
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TO-FROM CHAR routines support BC and AC postfix for years.
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You can combine BC and AC with TH.
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OTHER:
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-----
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'\' - must be use as double \\
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'\\HH\\MI\\SS' --> 11\45\56
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'"' - string berween a quotation marks is skipen and not
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is parsed. If you wand write '"' to output you must
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use \\"
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'"Month: "Month' --> Month: November
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'\\"YYYY Month\\"' --> "1999 November "
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text - the PostgreSQL TO-FROM CHAR support text without '"',
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but " text " is fastly and you have guarantee,
|
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that this text not will interprete as keyword.
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||||
WARNING:
|
||||
-------
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||||
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You DON'T OMIT differention between fill mode (FM prefix)
|
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and standard input in FROM_CHAR (TO_DATE), because this
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routines can't scan your input string and conver it to
|
||||
Datetime. See:
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||||
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||||
WRONG: FROM_CHAR('August 1999', 'Month YYYY');
|
||||
|
||||
RIGHT: FROM_CHAR('August 1999', 'Month YYYY');
|
||||
or FROM_CHAR('August 1999', 'FMMonth YYYY');
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||||
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||||
(! Month is 9-letters string if you not set fill-mode !)
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||||
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||||
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||||
---------------------------
|
||||
TODO / Now is not supported:
|
||||
---------------------------
|
||||
|
||||
- spelled-out SP suffix ( 22 --> Twenty-two )
|
||||
- AM/PM
|
||||
|
||||
- not supported number to character converting
|
||||
|
||||
TO_CHAR(number, 'format')
|
||||
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
- secondary products :-) ------------------------------------------------------
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
|
||||
ORDINAL(int4, text)
|
||||
-------------------
|
||||
|
||||
* Translate number to ordinal number and return this as text
|
||||
|
||||
|
||||
* Examples:
|
||||
|
||||
template1=> select ordinal(21212, 'TH');
|
||||
ordinal
|
||||
-------
|
||||
21212ND
|
||||
|
||||
template1=> select ordinal(21212, 'th');
|
||||
ordinal
|
||||
-------
|
||||
21212nd
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||||
|
|
@ -0,0 +1,18 @@
|
|||
|
||||
#ifndef TO_FROM_CHAR_H
|
||||
#define TO_FROM_CHAR_H
|
||||
|
||||
/*------
|
||||
* For postgres
|
||||
*------
|
||||
*/
|
||||
extern text *to_char(DateTime *dt, text *format);
|
||||
extern DateTime *from_char(text *date_str, text *format);
|
||||
extern DateADT to_date(text *date_str, text *format);
|
||||
|
||||
extern text *ordinal(int4 num, text *type);
|
||||
|
||||
extern char *months_full[]; /* full months name */
|
||||
extern char *rm_months[]; /* roman numeral of months */
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
-- to-from_char.sql datetime routines --
|
||||
--
|
||||
-- Copyright (c) 1999, Karel Zak "Zakkr" <zakkr@zf.jcu.cz>
|
||||
--
|
||||
-- This file is distributed under the GNU General Public License
|
||||
-- either version 2, or (at your option) any later version.
|
||||
|
||||
|
||||
-- Define the new functions
|
||||
--
|
||||
|
||||
create function to_char(datetime, text) returns text
|
||||
as 'MODULE_PATHNAME'
|
||||
language 'c';
|
||||
|
||||
create function from_char(text, text) returns datetime
|
||||
as 'MODULE_PATHNAME'
|
||||
language 'c';
|
||||
|
||||
create function to_date(text, text) returns date
|
||||
as 'MODULE_PATHNAME'
|
||||
language 'c';
|
||||
|
||||
create function ordinal(int, text) returns text
|
||||
as 'MODULE_PATHNAME'
|
||||
language 'c';
|
||||
|
||||
|
||||
-- end of file
|
||||
Loading…
Reference in New Issue