Hi,
This METADATA tag is useful for "heavy views" (or join). It allow the
use of:
- a "simple" table to draw, query graphically, etc... For instance
something like that:
LAYERS
METADATA
PM_RESULT_DATASUBSTITION "the_geom FROM my_geom_table USING
UNIQUE gid"
...
END
...
END
- a view when searching by attribute, displaying results, etc...For
instance something like that:
LAYERS
DATA "the_geom FROM (SELECT * FROM my_geom_table LEFT JOIN
my_attribute_table ON (id)) AS foo USING UNIQUE gid"
END
It requires that the "simple table" taht contains the geometry field has
also all the attributes needed for drawing (CLASSITEM, LABELITEM, ...)
It is not specify to graphical queries plugin.
Thomas
Le 01/05/2012 16:31, Andreas Douvalis a e'crit :
> Hi
>
> What is the use of PM_RESULT_DATASUBSTITION metadata in graphical queries
> plugin?
>
> In queryExtended.php in line 82 (approximately) there is one loop that
> check PM_RESULT_DATASUBSTITION metadata.
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