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/*PGR-GNU*****************************************************************
FILE: createIndex.sql
Copyright (c) 2014 Celia Virginia Vergara Castillo
vicky_vergara@hotmail.com
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
/************************************************************************
.. function:: _pgr_createIndex(tab, col,indextype)
_pgr_createIndex(sname,tname,colname,indextypes)
if the column is not indexed it creates a 'gist' index otherwise a 'btree' index
Examples:
* select _pgr_createIndex('tab','col','btree');
* select _pgr_createIndex('myschema','mytable','col','gist');
* perform 'select _pgr_createIndex('||quote_literal('tab')||','||quote_literal('col')||','||quote_literal('btree'))' ;
* perform 'select _pgr_createIndex('||quote_literal('myschema')||','||quote_literal('mytable')||','||quote_literal('col')||','||quote_literal('gist')')' ;
Precondition:
sname.tname.colname is a valid column on table tname in schema sname
indext is the indexType btree or gist
Postcondition:
sname.tname.colname its indexed using the indextype
Author: Vicky Vergara <vicky_vergara@hotmail.com>>
HISTORY
Created: 2014/JUL/28
************************************************************************/
--v2.6
CREATE FUNCTION _pgr_createIndex(
sname text, tname text, colname text, indext text,
IN reportErrs int default 1, IN fnName text default '_pgr_createIndex')
RETURNS void AS
$BODY$
DECLARE
debuglevel text;
naming record;
tabname text;
query text;
msgKind int;
BEGIN
msgKind = 0; -- debug_
execute 'show client_min_messages' into debuglevel;
tabname=_pgr_quote_ident(sname||'.'||tname);
perform _pgr_msg(msgKind, fnName, 'Checking ' || colname || ' column in ' || tabname || ' is indexed');
IF (_pgr_isColumnIndexed(sname,tname,colname, 0, fnName)) then
perform _pgr_msg(msgKind, fnName);
else
if indext = 'gist' then
query = 'create index '||_pgr_quote_ident(tname||'_'||colname||'_idx')||'
on '||tabname||' using gist('||quote_ident(colname)||')';
else
query = 'create index '||_pgr_quote_ident(tname||'_'||colname||'_idx')||'
on '||tabname||' using btree('||quote_ident(colname)||')';
end if;
perform _pgr_msg(msgKind, fnName, 'Adding index ' || tabname || '_' || colname || '_idx');
perform _pgr_msg(msgKind, fnName, ' Using ' || query);
set client_min_messages to warning;
BEGIN
execute query;
EXCEPTION WHEN others THEN
perform _pgr_onError( true, reportErrs, fnName,
'Could not create index on:' || colname, SQLERRM);
END;
execute 'set client_min_messages to '|| debuglevel;
perform _pgr_msg(msgKind, fnName);
END IF;
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
--v2.6
CREATE FUNCTION _pgr_createIndex(tabname text, colname text, indext text,
IN reportErrs int default 1, IN fnName text default '_pgr_createIndex')
RETURNS void AS
$BODY$
DECLARE
naming record;
sname text;
tname text;
BEGIN
select * from _pgr_getTableName(tabname, 2, fnName) into naming;
sname=naming.sname;
tname=naming.tname;
execute _pgr_createIndex(sname, tname, colname, indext, reportErrs, fnName);
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
COMMENT ON FUNCTION _pgr_createIndex(TEXT, TEXT, TEXT, TEXT, INTEGER, TEXT)
IS 'pgRouting internal function';
COMMENT ON FUNCTION _pgr_createIndex(TEXT, TEXT, TEXT, INTEGER, TEXT)
IS 'pgRouting internal function';
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