[mapserver-users] Oracle Spatial and MAXFEATURES, not implemented?

[Peter Hopfgartner]

I'm trying to limit the maximum number of features, as in the map file
snippet below.

MapServer is 5.6.3.

Anyway, the number of features drawn is not limited, as expected, but
thousands of shapes are processed.

Indeed, enabling -all_debug 5, the query passed to Oracle looks like;

---
msOracleSpatialLayerWhichShapes. Using this Sql to retrieve the data:
SELECT pln_id, pln_id, the_geom FROM plant_data_map WHERE
SDO_FILTER( the_geom, MDSYS.SDO_GEOMETRY(2003, :srid,
NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3),:ordinates ),'querytype=window') = 'TRUE'
msOracleSpatialLayerWhichShapes. Bind values: srid:25832
minx:666798.076923   miny:5169400.000000  maxx:667551.923077
maxy:5170000.000000 
---

Indeed, almost 15,000 shapes arrive:

---
msOracleSpatialLayerNextShape on layer 0x101363e0, row_num: 14934
msOracleSpatialLayerNextShape on layer 0x101363e0, Fetched 0 more rows
(14934 total)
msOracleSpatialLayerFreeItemInfo was called.
---

Peeking at the source in maporaclespatial.c, it seems that
layer->maxfeatures is never read and no limitation, maybe looking like
"ROWNUM <= layer->maxfeatures" is added to the SELECT statement.

Regards,

Peter




MAPFILE SNIPPET:

LAYER #----------------16-----------------
        GROUP "pflanzennr_black_12"
        NAME "Pflanzennr"
        STATUS ON
        TYPE POINT
        PROJECTION
                "init=epsg:25832"
        END
        CONNECTIONTYPE oraclespatial
        CONNECTION "{MYUSER}/{MYPASSWD}"
        DATA "the_geom from plant_data_map using  unique pln_id srid
25832"
        PROCESSING "CLOSE_CONNECTION=DEFER"
        SIZEUNITS meters
        LABELITEM "pln_id"
        MAXFEATURES 20
        TOLERANCE 1
        POSTLABELCACHE TRUE
        CLASS
                NAME "label"
                LABEL
                        TYPE TRUETYPE
                        PARTIALS TRUE
                        FONT "verdana"
                        COLOR 0 0 0
                        OUTLINECOLOR 255 255 255
                        SIZE 6
                        MINSIZE 6
                        MAXSIZE 8
                        POSITION CR
                        FORCE TRUE
                END
        END
END




-- 
Dott. Peter Hopfgartner

R3 GIS Srl - GmbH
Via Johann Kravogl-Str. 2
I-39012 Meran/Merano (BZ)
Email: peter.hopfgartner at r3-gis.com
Tel. : +39 0473 494949
Fax  : +39 0473 069902
www  : http://www.r3-gis.com

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