layerObj.queryByAttributes changed with Oracle

Benedikt Rothe umn-ms at HYDROTEC.DE
Thu Nov 29 03:44:29 PST 2007


Hello List

I'm using Mapserer with Oracle/Java-Mapscript and migrating my app from 
Mapserver 4.x to Mapserer 5.x
and have a problem with layerObj.queryByAttributes.

I used to query features with code like this:
  alayerObj.queryByAttributes(aMapObj, "ID", "ID=4711", mapscript.
MS_SINGLE);
In Mapserver 5 this code  results in an Mapserver-Error-Message stating, 
that the "SQL command is not properly ended".

The Mapserver-generated SQL-Command includes a Where-Clause of the form 
"ID = ID = 4711".

I had a look in maporaclespatial.c function "osFilteritem".
Follwing code seems to produce this Where-Clause:
 if (layer->filteritem != NULL)
 {
   sprintf (query_str + strlen(query_str), " %s = ", layer->filteritem);
   //snprintf (query_str + strlen(query_str), " %s = ", 
layer->filteritem);
 }

Changing my Java-Code to 
  alayerObj.queryByAttributes(aMapObj, "ID", "4711", mapscript.MS_SINGLE);
solves the problem.

Questions:
* Is this a bug in Mapserver or a new feature? 
* Is this really a change in Mapserver 5.0?
* Shall I rather change my Java-Code or shall I patch Mapserver/ 
maporaclespatial.c/osFilteritem?
   Would the changed Java-Code work with the Oracle-driver only?

Greetings from Aachen/Germany
Benedikt Rothe

Attachement "Error-Message": (Added Newlines) 
msOracleSpatialLayerWhichShapes(): OracleSpatial error. Error: ORA-00933: 
SQL command not properly ended 
 . Query statement: 
SELECT 
  ID, ID, SHAPE
FROM 
  (select ID,SHAPE 
   FROM MYTABLE) 
   WHERE  ID =  ID = 4711  AND 
   SDO_FILTER( 
     SHAPE, MDSYS.SDO_GEOMETRY(2003, 82015,
     NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,3),
     MDSYS.SDO_ORDINATE_ARRAY(2501576.69,5621567,2503419.31,5622567) 
),'querytype=window') = 'TRUE' . 
Check your data statement.

Attachement "Part of mapfile":
  # Projekte
  LAYER
    NAME "PROJEKT"
    TYPE POINT
    STATUS DEFAULT
    #DEBUG ON
    TEMPLATE "dummy.html"
    CONNECTION "XXX/YYY at ZZZ"
    CONNECTIONTYPE oraclespatial
    DATA "SHAPE FROM (select ID,SHAPE FROM MYTABLE) using unique ID srid 
82015"
    CLASS
      NAME ""
      STYLE
        COLOR 0 100 100
        OUTLINECOLOR 0 0 0
        SIZE 12
        SYMBOL 'star'
      END
    END
  END
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