How to store the result of a where close to use in the where clause of a reader ?

Rather than using the regular reader, you could simply connect your SQLCreator to a FeatureReader, with the FID in the where-clause.

Hi @tsirkuse, I would use the DatabaseJoiner after the SQLCreator to read the PostGIS database.

A nice trick on how to create the where IN clause (something I learnt a long time ago from @erik_jan and I am still using) is:

If you have >1000 features (ID's) you will need to do the following:

• Add a Counter starting with 0
• Add an ExpressionEvaluator with floor(@Value(_count)/1000,0).
• Add an Aggregator with group by on _result and concatenate the attributes you want in the where clause.

Hope this helps.

Itay

Ah, tried that first, not possible cause what I want to join is the geometry. Except if there is a work around for that problem?

I don't see how that helps me not reading half a milion post gis records I don't need.... Maybe I am missing something, but I really don't see it. I want to use the id's selected by my sqlcreator (oracle) in my post-gis reader. So I need to somehow store the values in a list that I can use in the where clause...

I've always found the most efficient way to do this is to write a temporary table in the POSTGIS database then use an sqlexecutor to return the matched records.

Aha @tsirkuse, then you should use the FeatureReader. This transformer is the same as the DatabaseJoiner except that you can also do a spatial join..

I agree, in particular if there's a non-trivial number of records to join. Although it does depend on having sufficient rights.

This is what I had i mind, it will prevent you from reading the entire postgis table and as long as the FID column is indexed it should be fairly quick:

Although if you have a "large" number of FIDs, then you should look into the suggestion from @egomm, it will scale much better (but requires that you have sufficient rights).