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/contrib patch from Karel.
This commit is contained in:
Bruce Momjian
@ -1,65 +1,53 @@
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#-------------------------------------------------------------------------
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#
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# Makefile --
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# $Header: /cvsroot/pgsql/contrib/array/Attic/Makefile,v 1.8 2000/06/15 18:54:31 momjian Exp $
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#
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# Makefile for array iterator module.
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#
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#-------------------------------------------------------------------------
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PGDIR = ../..
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SRCDIR = $(PGDIR)/src
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TOPDIR=../..
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include $(SRCDIR)/Makefile.global
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include ../Makefile.global
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NAME = array_iterator
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PROGRAM =
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OBJS = $(NAME).o
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DOCS = $(NAME).doc
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SQLS = $(NAME).sql
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BINS =
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EXAMPLES=
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MODS = $(NAME)$(DLSUFFIX)
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CFLAGS += -I. $(CFLAGS_SL)
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MODNAME = array_iterator
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OTHER_CLEAN = $(SQLS)
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SQLDEFS = $(MODNAME).sql
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MODULE = $(MODNAME)$(DLSUFFIX)
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MODDIR = $(LIBDIR)/modules
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SQLDIR = $(LIBDIR)/sql
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all: module sql
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module: $(MODULE)
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sql: $(SQLDEFS)
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install: $(MODULE) $(SQLDEFS) $(MODDIR) $(SQLDIR)
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cp -p $(MODULE) $(MODDIR)/
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strip $(MODDIR)/$(MODULE)
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cp -p $(SQLDEFS) $(SQLDIR)/
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install-doc:
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if [ -d "$(DOCDIR)" ]; then \
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cp -p *.doc $(DOCDIR); \
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else \
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cp -p *.doc $(SQLDIR); \
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fi
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$(MODDIR):
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mkdir -p $@
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$(SQLDIR):
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mkdir -p $@
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all: $(MODS) $(SQLS)
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%.sql: %.sql.in
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sed "s|MODULE_PATHNAME|$(MODDIR)/$(MODULE)|" < $< > $@
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$(SED) "s|MODULE_PATHNAME|$(CONTRIB_MODDIR)/$@|" < $< > $@
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.SUFFIXES: $(DLSUFFIX)
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install: install_doc install_sql install_mod
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install_doc:
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for inst_file in $(DOCS); do \
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$(INSTALL) $(INSTL_LIB_OPTS) $$inst_file $(CONTRIB_DOCDIR); \
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done
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install_sql:
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for inst_file in $(SQLS); do \
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$(INSTALL) $(INSTL_LIB_OPTS) $$inst_file $(CONTRIB_SQLDIR); \
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done
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install_mod:
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for inst_file in $(MODS); do \
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$(INSTALL) $(INSTL_SHLIB_OPTS) $$inst_file $(CONTRIB_MODDIR); \
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done
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%$(DLSUFFIX): %.c
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$(CC) $(CFLAGS) -shared -o $@ $<
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depend dep:
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$(CC) -MM $(CFLAGS) *.c >depend
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$(CC) -MM -MG $(CFLAGS) *.c > depend
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clean:
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rm -f *~ $(MODULE) $(MODNAME).sql
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$(RM) *~ $(OBJS) $(MODS) $(PROGRAM) depend $(OTHER_CLEAN) core log
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ifeq (depend,$(wildcard depend))
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include depend
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49
contrib/array/README
Normal file
49
contrib/array/README
Normal file
@ -0,0 +1,49 @@
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Array iterator functions, by Massimo Dal Zotto <dz@cs.unitn.it>
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Copyright (C) 1999, Massimo Dal Zotto <dz@cs.unitn.it>
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This software 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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This loadable module defines a new class of functions which take
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an array and a scalar value, iterate a scalar operator over the
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elements of the array and the value, and compute a result as
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the logical OR or AND of the iteration results.
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For example array_int4eq returns true if some of the elements
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of an array of int4 is equal to the given value:
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array_int4eq({1,2,3}, 1) --> true
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array_int4eq({1,2,3}, 4) --> false
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If we have defined T array types and O scalar operators we can
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define T x O x 2 array functions, each of them has a name like
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"array_[all_]<basetype><operation>" and takes an array of type T
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iterating the operator O over all the elements. Note however
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that some of the possible combination are invalid, for example
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the array_int4_like because there is no like operator for int4.
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We can then define new operators based on these functions and use
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them to write queries with qualification clauses based on the
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values of some of the elements of an array.
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For example to select rows having some or all element of an array
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attribute equal to a given value or matching a regular expression:
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create table t(id int4[], txt text[]);
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-- select tuples with some id element equal to 123
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select * from t where t.id *= 123;
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-- select tuples with some txt element matching '[a-z]'
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select * from t where t.txt *~ '[a-z]';
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-- select tuples with all txt elements matching '^[A-Z]'
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select * from t where t.txt[1:3] **~ '^[A-Z]';
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The scheme is quite general, each operator which operates on a base type
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can be iterated over the elements of an array. It seem to work well but
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defining each new operators requires writing a different C function.
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Furthermore in each function there are two hardcoded OIDs which reference
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a base type and a procedure. Not very portable. Can anyone suggest a
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better and more portable way to do it ?
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See also array_iterator.sql for an example on how to use this module.
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