Folks,
I am using QGIS 2.18.3 to connect to Oracle (12.1) table with a primary key:
create table foo (
fid number(10),
an_attribute varchar2(10),
geom sdo_geometry
);
INSERT INTO USER_SDO_GEOM_METADATA (table_name,column_name,DimInfo,srid) VALUES
('FOO', 'GEOM', SDO_DIM_ARRAY(SDO_DIM_ELEMENT('X', 5979462.12680312,
6024838.75881869, 0.005), SDO_DIM_ELEMENT('Y', 2085800.17222035,
2131294.00019577, 0.005)), 2872);
commit;
insert into foo(fid,an_attribute,geom) values
(1,'D',SDO_GEOMETRY(2003,2872,NULL,SDO_ELEM_INFO_ARRAY(1,1003,1),SDO_ORDINATE_ARRAY(5992342.97800986,2112457.60086077,
5992462.06832285,2112461.87775511, 5992461.15953203,2112486.86130093,
5992342.06921902,2112482.5844066, 5992342.97800986,2112457.60086077)));
insert into foo(fid,an_attribute,geom) values
(2,'I',SDO_GEOMETRY(2007,2872,NULL,SDO_ELEM_INFO_ARRAY(1,1003,1),SDO_ORDINATE_ARRAY(5992230.58945511,2112203.40320644,
5992352.0678867,2112207.76605861, 5992351.15909585,2112232.74960443,
5992229.68033619,2112228.38675226, 5992230.58945511,2112203.40320644)));
commit;
create index foo_geom on foo(geom) indextype is mdsys.spatial_index
parameters('sdo_indx_dims=2 layer_gtype=MULTIPOLYGON');
-- Create primary key (lazy method) -> automatically creates unique index with
same name
alter table foo add constraint foo_pk primary key (fid);
-- Check Unique Index name same as primary constraint
-- Query extracted from SQL tracing of QGIS session.
COLUMN column_name FORMAT A11
SELECT column_name
FROM all_ind_columns a
JOIN all_constraints b ON a.index_name=constraint_name AND
a.index_owner=b.owner
WHERE b.constraint_type='P' AND b.owner='TWEED' AND b.table_name='FOO';
/*
COLUMN_NAME
-----------
FID
*/
-- Now we know we have a QGIS compliant primary key name, connect QGIS to
Oracle and check if primary key name appears
--> No Primary key displayed.
-- Can anyone tell me why the name of the primary key is not being returned?
-- If any developer is listening, the QGIS query that finds the column_name of
the primary key does not cope with situations where a unique index is created
BEFORE the primary key is defined as follows:
-- Create primary key using more flexible approach
alter table foo drop constraint foo_pk;
create unique index foo_fid_uidx on foo(fid);
alter table foo add constraint foo_pk primary key (fid) using index
foo_fid_uidx;
-- Execute normal QGIS SQL:
SELECT column_name FROM all_ind_columns a JOIN all_constraints b ON
a.index_name=constraint_name AND a.index_owner=b.owner WHERE
b.constraint_type='P' AND b.owner='TWEED' AND b.table_name='FOO';
--> no rows selected.
-- Actual query should be:
SELECT column_name
FROM all_ind_columns a
INNER JOIN
all_constraints b
ON ( a.index_owner=b.owner AND a.table_name=b.table_name AND
a.index_name=b.index_name )
WHERE b.constraint_type='P' AND b.owner='TWEED' AND b.table_name='FOO';
/*
COLUMN_NAME
-----------
FID
*/
-- Note: ALTER ADD CONSTRAINT PRIMARY KEY without USING INDEX clause creates
the index and then inserts its name (same as constraint) into metadata so that
index_name is always constraint_name except when USING INDEX clause is used,
then index_name in user_constraints is name of user defined unique index.
DELETE FROM USER_SDO_GEOM_METADATA where table_name = 'FOO';
commit;
drop table foo purge;
regards
Simon
--
Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
SpatialDB Advice and Design, Solutions Architecture and Programming,
Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL
Certified Professional
Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius
Topology and Studio Specialist.
39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
Website: www.spatialdbadvisor.com
Email: si...@spatialdbadvisor.com
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