101 lines
2.5 KiB
MySQL
101 lines
2.5 KiB
MySQL
-- datetime_functions.sql --
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--
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-- SQL code to define the new date and time functions and operators
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--
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-- Copyright (c) 1998, Massimo Dal Zotto <dz@cs.unitn.it>
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--
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-- This file is distributed under the GNU General Public License
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-- either version 2, or (at your option) any later version.
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-- Define the new time functions.
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--
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create function hhmm_in(opaque) returns time
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as 'MODULE_PATHNAME'
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language 'c';
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create function hhmm_out(opaque) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function hhmm(time) returns time
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as 'MODULE_PATHNAME'
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language 'c';
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create function time_difference(time,time) returns time
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as 'MODULE_PATHNAME'
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language 'c';
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create function time_hours(time) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function time_minutes(time) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function time_seconds(time) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function as_minutes(time) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function as_seconds(time) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function date_day(date) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function date_month(date) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function date_year(date) returns int4
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as 'MODULE_PATHNAME'
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language 'c';
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create function currenttime() returns time
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as 'MODULE_PATHNAME'
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language 'c';
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create function currentdate() returns date
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as 'MODULE_PATHNAME'
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language 'c';
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-- Define new operator - for time.
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--
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create operator - (
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leftarg=time,
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rightarg=time,
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procedure=time_difference);
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-- Define functions to switch from time to hhmm representation.
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--
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-- select hhmm_mode();
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-- select time_mode();
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--
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create function hhmm_mode() returns text
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as 'update pg_type set typinput =''hhmm_in'' where typname=''time'';
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update pg_type set typoutput=''hhmm_out'' where typname=''time'';
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select ''hhmm_mode''::text;'
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language 'sql';
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create function time_mode() returns text
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as 'update pg_type set typinput =''time_in'' where typname=''time'';
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update pg_type set typoutput=''time_out'' where typname=''time'';
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select ''time_mode''::text;'
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language 'sql';
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-- Use these to do the updates manually
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--
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-- update pg_type set typinput ='hhmm_in' where typname='time';
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-- update pg_type set typoutput='hhmm_out' where typname='time';
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--
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-- update pg_type set typinput ='time_in' where typname='time';
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-- update pg_type set typoutput='time_out' where typname='time';
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-- end of file
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