55 lines
1.3 KiB
SQL
55 lines
1.3 KiB
SQL
-- unixdate
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-- Routines to convert int4 (Unix system time) to datetime
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-- and int4 (delta time) to timespan
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--
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-- Thomas Lockhart (lockhart@alumni.caltech.edu)
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-- 1997-11-25
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--
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-- This cheats and reuses existing code in the standard package.
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-- Can not include this directly because built-in functions are optimized
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-- into a cache and the duplicate function names abstime_datetime() and
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-- reltime_timespan() result in duplicate constants.
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--
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-- This works with Postgres v6.2 and higher.
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--
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-- Conversions from integer to datetime
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--
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CREATE FUNCTION abstime_datetime(int4)
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RETURNS datetime
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AS '-' LANGUAGE 'internal';
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CREATE FUNCTION datetime(int4)
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RETURNS datetime
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AS 'select abstime_datetime($1)' LANGUAGE 'SQL';
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CREATE FUNCTION reltime_timespan(int4)
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RETURNS timespan
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AS '-' LANGUAGE 'internal';
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CREATE FUNCTION timespan(int4)
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RETURNS timespan
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AS 'select reltime_timespan($1)' LANGUAGE 'SQL';
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--
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-- Conversions back to integer
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--
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CREATE FUNCTION datetime_abstime(datetime)
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RETURNS int4
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AS '-' LANGUAGE 'internal';
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CREATE FUNCTION utime(datetime)
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RETURNS int4
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AS 'select datetime_abstime($1)' LANGUAGE 'SQL';
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CREATE FUNCTION timespan_reltime(timespan)
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RETURNS int4
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AS '-' LANGUAGE 'internal';
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CREATE FUNCTION uspan(timespan)
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RETURNS int4
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AS 'select timespan_reltime($1)' LANGUAGE 'SQL';
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