first commit for openGauss connect odbc code
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lishifu
228
odbc.sql
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228
odbc.sql
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-- PostgreSQL catalog extensions for ODBC compatibility (odbc.sql)
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-- ODBC scalar functions are described here:
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-- Microsoft ODBC Programmer's Reference, Appendix E: Scalar Functions
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-- http://msdn.microsoft.com/library/ms711813.aspx
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-- Note: If we format this file consistently we can automatically
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-- generate a corresponding "drop script". Start "CREATE" in the first
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-- column, and keep everything up to and including the argument list on
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-- the same line. See also the makefile rule.
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-- String Functions
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-- ++++++++++++++++
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--
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-- Built-in: ASCII, BIT_LENGTH, CHAR_LENGTH, CHARACTER_LENGTH, LTRIM,
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-- OCTET_LENGTH, POSITION, REPEAT, RTRIM, SUBSTRING
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-- Missing: DIFFERENCE, REPLACE, SOUNDEX, LENGTH (ODBC sense)
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-- Keyword problems: CHAR
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-- CHAR(code)
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CREATE OR REPLACE FUNCTION "char"(integer) RETURNS text AS '
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SELECT chr($1);
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' LANGUAGE SQL;
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-- CONCAT(string1, string2)
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CREATE OR REPLACE FUNCTION concat(text, text) RETURNS text AS '
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SELECT $1 || $2;
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' LANGUAGE SQL;
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-- INSERT(string1, start, len, string2)
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CREATE OR REPLACE FUNCTION insert(text, integer, integer, text) RETURNS text AS '
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SELECT substring($1 from 1 for $2 - 1) || $4 || substring($1 from $2 + $3);
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' LANGUAGE SQL;
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-- LCASE(string)
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CREATE OR REPLACE FUNCTION lcase(text) RETURNS text AS '
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SELECT lower($1);
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' LANGUAGE SQL;
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-- LEFT(string, count)
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CREATE OR REPLACE FUNCTION left(text, integer) RETURNS text AS '
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SELECT substring($1 for $2);
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' LANGUAGE SQL;
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-- LOCATE(substring, string[, start])
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CREATE OR REPLACE FUNCTION locate(text, text) RETURNS integer AS '
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SELECT position($1 in $2);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION locate(text, text, integer) RETURNS integer AS '
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SELECT position($1 in substring($2 from $3)) + $3 - 1;
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' LANGUAGE SQL;
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-- RIGHT(string, count)
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CREATE OR REPLACE FUNCTION right(text, integer) RETURNS text AS '
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SELECT substring($1 from char_length($1) - $2 + 1);
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' LANGUAGE SQL;
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-- SPACE(count)
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CREATE OR REPLACE FUNCTION space(integer) RETURNS text AS '
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SELECT repeat('' '', $1);
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' LANGUAGE SQL;
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-- UCASE(string)
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CREATE OR REPLACE FUNCTION ucase(text) RETURNS text AS '
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SELECT upper($1);
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' LANGUAGE SQL;
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-- Numeric Functions
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-- +++++++++++++++++
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--
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-- Built-in: ABS, ACOS, ASIN, ATAN, ATAN2, COS, COT, DEGRESS, EXP,
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-- FLOOR, MOD, PI, RADIANS, ROUND, SIGN, SIN, SQRT, TAN
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-- Missing: LOG (ODBC sense)
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-- CEILING(num)
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CREATE OR REPLACE FUNCTION ceiling(numeric) RETURNS numeric AS '
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SELECT ceil($1);
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' LANGUAGE SQL;
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-- LOG10(num)
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CREATE OR REPLACE FUNCTION log10(double precision) RETURNS double precision AS '
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SELECT log($1);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION log10(numeric) RETURNS numeric AS '
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SELECT log($1);
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' LANGUAGE SQL;
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-- POWER(num, num)
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CREATE OR REPLACE FUNCTION power(double precision, double precision)
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RETURNS double precision AS '
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SELECT pow($1, $2);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION power(numeric, numeric)
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RETURNS numeric AS '
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SELECT pow($1, $2);
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' LANGUAGE SQL;
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-- RAND([seed])
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CREATE OR REPLACE FUNCTION rand() RETURNS double precision AS '
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SELECT random();
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION rand(double precision) RETURNS double precision AS '
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SELECT setseed($1);
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SELECT random();
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' LANGUAGE SQL;
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-- TRUNCATE(num, places)
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CREATE OR REPLACE FUNCTION truncate(numeric, integer) RETURNS numeric AS '
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SELECT trunc($1, $2);
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' LANGUAGE SQL;
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-- Time, Date, and Interval Functions
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-- ++++++++++++++++++++++++++++++++++
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--
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-- Built-in: CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, EXTRACT, NOW
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-- Missing: none
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CREATE OR REPLACE FUNCTION curdate() RETURNS date AS '
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SELECT current_date;
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION curtime() RETURNS time with time zone AS '
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SELECT current_time;
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION odbc_timestamp() RETURNS timestamp with time zone AS '
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SELECT current_timestamp;
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION dayname(timestamp) RETURNS text AS '
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SELECT to_char($1,''Day'');
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION dayofmonth(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(day FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION dayofweek(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(dow FROM $1) AS integer) + 1;
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION dayofyear(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(doy FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION hour(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(hour FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION minute(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(minute FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION month(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(month FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION monthname(timestamp) RETURNS text AS '
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SELECT to_char($1, ''Month'');
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION quarter(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(quarter FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION second(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(second FROM $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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xCREATE OR REPLACE FUNCTION timestampadd(integer, integer, timestamp)
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RETURNS timestamp AS '
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SELECT CAST(($3 + ($2 * $1)) AS timestamp);
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' LANGUAGE SQL;
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xCREATE OR REPLACE FUNCTION timestampdiff(integer, integer, timestamp)
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RETURNS timestamp AS '
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SELECT CAST(($3 + ($2 * $1)) AS timestamp);
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' LANGUAGE SQL;
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*/
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CREATE OR REPLACE FUNCTION week(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(week FROM $1) AS integer);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION year(timestamp) RETURNS integer AS '
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SELECT CAST(EXTRACT(year FROM $1) AS integer);
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' LANGUAGE SQL;
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-- System Functions
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-- ++++++++++++++++
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--
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-- Built-in: USER
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-- Missing: DATABASE, IFNULL
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CREATE OR REPLACE FUNCTION odbc_user() RETURNS text AS '
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SELECT CAST(current_user AS TEXT);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION odbc_current_user() RETURNS text AS '
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SELECT CAST(current_user AS TEXT);
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' LANGUAGE SQL;
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CREATE OR REPLACE FUNCTION odbc_session_user() RETURNS text AS '
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SELECT CAST(session_user AS TEXT);
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' LANGUAGE SQL;
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