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Commit 9f2a07d

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Thomas G. Lockhart
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Internal functions to support newest ODBC driver {fn ...} conventions.
Includes compiled code to support pre-7.0 backends, but for 7.0 only requires executing odbc.sql.
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‎contrib/odbc/Makefile

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# ODBC extensions
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# Thomas Lockhart 2000-04-03
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SRCDIR= ../../src
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include $(SRCDIR)/Makefile.global
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ifndef PGLIB
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PGLIB= .
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endif
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CFLAGS+= $(CFLAGS_SL) -I$(SRCDIR)/include
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TARGETS_7= odbc.sql
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TARGETS_PRE7= odbc$(DLSUFFIX) odbc-pre7.sql
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TARGETS= $(TARGETS_7)
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CLEANFILES+= $(TARGETS) $(TARGETS_PRE7)
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all:: $(TARGETS)
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install: all
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ifneq ($(filter odbc$(DLSUFFIX), $(TARGETS)),)
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-test -d $(PGLIB) || $(INSTALL) -d $(PGLIB)
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$(INSTALL) odbc$(DLSUFFIX) $(PGLIB)
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endif
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pre7:
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$(MAKE) TARGETS="$(TARGETS) $(TARGETS_PRE7)"
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install-pre7:
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$(MAKE) TARGETS="$(TARGETS) $(TARGETS_PRE7)" install
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odbc-pre7.sql: odbc-pre7.source odbc.sql
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rm -f $@; \
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cat $^ \
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| sed -e "s:_OBJWD_:$(PGLIB):g" \
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-e "s:_DLSUFFIX_:$(DLSUFFIX):g" \
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-e "s:float(15):float8:g" > $@
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%.sql: %.source
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rm -f $@; \
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sed -e "s:_OBJWD_:$(PGLIB):g" \
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-e "s:_DLSUFFIX_:$(DLSUFFIX):g" < $< > $@
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clean:
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rm -f $(TARGETS) *.o

‎contrib/odbc/README

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This directory contains support functions for the ODBC driver
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supplied with PostgreSQL-7.0.
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To enable additional ODBC functions with PostgreSQL-7.0, simply
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execute the commands in odbc.sql:
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psql
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Welcome to psql, the PostgreSQL interactive terminal.
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Type: \copyright for distribution terms
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\h for help with SQL commands
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\? for help on internal slash commands
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\g or terminate with semicolon to execute query
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\q to quit
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postgres=# \i odbc.sql
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CREATE
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...
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To enable additional ODBC functions with versions of PostgreSQL
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prior to PostgreSQL-7.0 (e.g. PostgreSQL-6.5.3), build the shared
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library and SQL commands as follows:
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make pre7
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psql
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Welcome to psql, the PostgreSQL interactive terminal.
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Type: \copyright for distribution terms
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\h for help with SQL commands
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\? for help on internal slash commands
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\g or terminate with semicolon to execute query
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\q to quit
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postgres=# \i odbc-pre7.sql
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CREATE
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...
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‎contrib/odbc/odbc-pre7.source

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-- ODBC-pre7.sql
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--
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-- Use float8 rather than float(15) since pre-7.0 does not accept
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-- SQL92 type names of this form in the CREATE FUNCTION command.
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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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-- Compatibility functions for pre-v7.0.
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-- These should be applied to pre-v7.0 databases
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-- when using the v7.0 ODBC driver.
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--
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CREATE FUNCTION char_length(text)
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RETURNS integer
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AS 'SELECT length(CAST($1 AS text))'
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LANGUAGE 'SQL';
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CREATE FUNCTION pow(float8)
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RETURNS float8
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AS 'SELECT dpow($1)'
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LANGUAGE 'SQL';
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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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CREATE FUNCTION ascii(text)
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RETURNS integer
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AS '_OBJWD_/odbc_DLSUFFIX_', 'ascii'
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LANGUAGE 'C';
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CREATE FUNCTION ichar(integer)
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RETURNS char(1)
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AS '_OBJWD_/odbc_DLSUFFIX_', 'ichar'
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LANGUAGE 'C';
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CREATE FUNCTION insert(text, integer, integer, text)
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RETURNS text
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AS '_OBJWD_/odbc_DLSUFFIX_', 'insert'
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LANGUAGE 'C';
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-- replace all occurences of $2 with $3
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CREATE FUNCTION replace(text, text, text)
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RETURNS text
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AS '_OBJWD_/odbc_DLSUFFIX_', 'replace'
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LANGUAGE 'C';
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-- return the string repeated n times
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CREATE FUNCTION repeat(text, integer)
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RETURNS text
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AS '_OBJWD_/odbc_DLSUFFIX_', 'repeat'
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LANGUAGE 'C';
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--
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-- Mathematical functions for pre-v7.0
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--
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CREATE FUNCTION dround(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dround'
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LANGUAGE 'C';
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CREATE FUNCTION round(float8)
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RETURNS float8
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AS 'SELECT dround($1)'
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LANGUAGE 'SQL';
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--
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-- Math functions present in backend, but not in catalog for v7.0
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--
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CREATE FUNCTION acos(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dacos'
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LANGUAGE 'C';
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CREATE FUNCTION asin(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dasin'
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LANGUAGE 'C';
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CREATE FUNCTION atan(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'datan'
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LANGUAGE 'C';
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CREATE FUNCTION atan2(float8,float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'datan2'
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LANGUAGE 'C';
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CREATE FUNCTION cos(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dcos'
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LANGUAGE 'C';
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CREATE FUNCTION cot(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dcot'
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LANGUAGE 'C';
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CREATE FUNCTION sin(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dsin'
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LANGUAGE 'C';
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CREATE FUNCTION dtan(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dtan'
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LANGUAGE 'C';
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CREATE FUNCTION degrees(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'degrees'
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LANGUAGE 'C';
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CREATE FUNCTION pi()
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'dpi'
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LANGUAGE 'C';
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CREATE FUNCTION radians(float8)
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'radians'
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LANGUAGE 'C';
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-- random number generator currently requires RAND_MAX be available
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CREATE FUNCTION random()
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RETURNS float8
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AS '_OBJWD_/odbc_DLSUFFIX_', 'drandom'
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LANGUAGE 'C';
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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 interval_mul(interval,float8)
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RETURNS interval
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AS '_OBJWD_/odbc_DLSUFFIX_'
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LANGUAGE 'C';
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CREATE OPERATOR * (
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LEFTARG = interval,
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RIGHTARG = float8,
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PROCEDURE = interval_mul
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);
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