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pgrouting/sql/common/createIndex.sql at master · NextechGS/pgrouting · GitHub
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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
***********************************************************************
*/
CREATE OR REPLACE
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;
CREATE OR REPLACE
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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