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Converting Mongo OR query to Java language query
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Christopher Carver  
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 More options Oct 12 2012, 11:23 am
From: Christopher Carver <christopher.car...@gmail.com>
Date: Fri, 12 Oct 2012 08:23:55 -0700 (PDT)
Local: Fri, Oct 12 2012 11:23 am
Subject: Converting Mongo OR query to Java language query
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I have the following MongoDB query that I need to convert to Java language.

db.someCollection.count( { $or :  [ { 'WORD' : 'NICE' } , { 'WORD' :
'HAPPY' } , { 'WORD' : 'BAD' } ] } );

I'm stuck on how to stipulate the the OR condition as an array in the
BasicDBObject. Not sure what the proper approach for this.

BasicDBObject cond1 = new BasicDBObject( "WORD", "NICE" );

BasicDBObject cond2 = new BasicDBObject( "WORD", "HAPPY" );

BasicDBObject cond3 = new BasicDBObject( "WORD", "BAD" );

BasicDBObject query = new BasicDBObject();

query.put("$or", ???? );


 
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Sid  
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 More options Oct 12 2012, 4:42 pm
From: Sid <siddharth.si...@10gen.com>
Date: Fri, 12 Oct 2012 13:42:19 -0700 (PDT)
Local: Fri, Oct 12 2012 4:42 pm
Subject: Re: Converting Mongo OR query to Java language query
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Something like this should work :

ArrayList orList = new ArrayList();

orList.add(new BasicDBObject("WORD", "NICE"));
orList.add(new BasicDBObject("WORD", "HAPPY"));
orList.add(new BasicDBObject("WORD", "BAD"));

BasicDBObject query = new BasicDBObject("$or", orList);

On Oct 12, 11:23 am, Christopher Carver <christopher.car...@gmail.com>
wrote:


 
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Steve Briskin  
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 More options Oct 12 2012, 4:55 pm
From: Steve Briskin <steve.bris...@10gen.com>
Date: Fri, 12 Oct 2012 13:55:09 -0700 (PDT)
Local: Fri, Oct 12 2012 4:55 pm
Subject: Re: Converting Mongo OR query to Java language query
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I addition to Sid's solution, you can do any of these.  I'm using the
QueryBuilder, but all of these queries can be constructed with
BasicDBObject as well.

        DBObject query = QueryBuilder.start().or(cond1, cond2, cond3).get();

If you have a List of conditions:

        DBObject query = QueryBuilder.start().or(orList.toArray(new
DBObject[]{})).get();
Since you're querying for values of the same field, you can use $in instead
of $or:

      List values = Arrays.asList("NICE", "HAPPY", "BAD");

      DBObject query2 = QueryBuilder.start("WORD").in(values).get();


 
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