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146 lines
3.3 KiB
SQL
146 lines
3.3 KiB
SQL
-- ODBC.sql
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--
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--
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-- Character string manipulation
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--
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--
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-- Extensions for ODBC compliance in v7.0.
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-- In the current driver, ODBC functions must map directly into a
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-- Postgres function. So in some cases we must create a compatible
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-- function.
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--
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-- truncate on the left
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CREATE FUNCTION ltrunc(text, integer)
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RETURNS text
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AS 'SELECT substring($1 FROM 1 FOR $2)'
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LANGUAGE 'SQL';
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-- truncate on the right
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CREATE FUNCTION rtrunc(text, integer)
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RETURNS text
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AS 'SELECT substring($1 FROM (char_length($1)-($2)+1) FOR $2)'
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LANGUAGE 'SQL';
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CREATE FUNCTION space(integer)
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RETURNS text
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AS 'SELECT lpad('''', $1, '' '')'
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LANGUAGE 'SQL';
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--
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-- Mathematical functions
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--
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CREATE FUNCTION truncate(numeric,integer)
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RETURNS numeric
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AS 'SELECT trunc($1, $2)'
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LANGUAGE 'SQL';
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--
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-- Date/time functions for v7.0
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--
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CREATE FUNCTION curdate()
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RETURNS date
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AS 'SELECT CAST(''now'' AS date)'
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LANGUAGE 'SQL';
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CREATE FUNCTION curtime()
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RETURNS time
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AS 'SELECT CAST(''now'' AS time)'
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LANGUAGE 'SQL';
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CREATE FUNCTION dayname(timestamp)
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RETURNS text
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AS 'SELECT to_char($1,''Day'')'
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LANGUAGE 'SQL';
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CREATE FUNCTION dayofmonth(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''day'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION dayofweek(timestamp)
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RETURNS integer
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AS 'SELECT ( CAST(date_part(''dow'', $1) AS integer) + 1)'
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LANGUAGE 'SQL';
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CREATE FUNCTION dayofyear(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''doy'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION hour(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''hour'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION minute(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''minute'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION odbc_month(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''month'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION monthname(timestamp)
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RETURNS text
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AS 'SELECT to_char($1, ''Month'')'
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LANGUAGE 'SQL';
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CREATE FUNCTION quarter(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''quarter'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION second(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''second'', $1) AS integer)'
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LANGUAGE 'SQL';
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/*
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-- The first argument is an integer constant denoting the units
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-- of the second argument. Until we know the actual values, we
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-- cannot implement these. - thomas 2000-04-11
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CREATE FUNCTION timestampadd(integer,integer,timestamp)
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RETURNS timestamp
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AS 'SELECT CAST(($3 + ($2 * $1)) AS timestamp)'
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LANGUAGE 'SQL';
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CREATE FUNCTION timestampdiff(integer,integer,timestamp)
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RETURNS timestamp
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AS 'SELECT CAST(($3 + ($2 * $1)) AS timestamp)'
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LANGUAGE 'SQL';
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*/
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CREATE FUNCTION week(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''week'', $1) AS integer)'
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LANGUAGE 'SQL';
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CREATE FUNCTION year(timestamp)
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RETURNS integer
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AS 'SELECT CAST(date_part(''year'', $1) AS integer)'
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LANGUAGE 'SQL';
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--
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-- System functions.
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--
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/*
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CREATE FUNCTION database()
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RETURNS text
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AS 'SELECT ...'
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LANGUAGE 'SQL';
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*/
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CREATE FUNCTION odbc_user()
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RETURNS text
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AS 'SELECT CAST(USER AS text)'
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LANGUAGE 'SQL';
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