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build BSON string recursively and re-use for query
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Mick  
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 More options Sep 19 2012, 5:31 pm
From: Mick <m.d.berce...@gmail.com>
Date: Wed, 19 Sep 2012 14:31:33 -0700 (PDT)
Local: Wed, Sep 19 2012 5:31 pm
Subject: build BSON string recursively and re-use for query
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In C++ , instead of doing this:
qryStr = QUERY("d" << 1 << "t" << 2 << "l" << "mine");
bsonStr = BSON("d" << 1 << "t" << 2 << "l" << "mine");

can I do something like
strStream << "d" << 1 << "t" << 2 << "l" << "mine";
qryStr = QUERY(strStream);
bsonStr = BSON(strStream);

I tried defining strStream as stringstream, but it's complaining.  
Is that even possible in C++?

Thank you in advance.


 
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David Hows  
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 More options Sep 20 2012, 12:16 am
From: David Hows <david.h...@10gen.com>
Date: Wed, 19 Sep 2012 21:16:55 -0700 (PDT)
Local: Thurs, Sep 20 2012 12:16 am
Subject: Re: build BSON string recursively and re-use for query
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Hi Mick,

The BSON function is actually a macro with a definition of
 #define BSON(x) (( mongo::BSONObjBuilder(64) << x ).obj())

You can build an object by creating a BSONObjBuilder and then just start
appending things too it, like so;

BSONObjBuilder query2;
query2.append("d", 1);
query2.append("t", 2);
query2.append("l", "mine");

Finally, when you need to use it for a query just use the .obj() method.

eg conn.query(ns, query2.obj());

Hope that helps,

David


 
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Mick  
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 More options Sep 20 2012, 2:42 pm
From: Mick <m.d.berce...@gmail.com>
Date: Thu, 20 Sep 2012 11:42:16 -0700 (PDT)
Local: Thurs, Sep 20 2012 2:42 pm
Subject: Re: build BSON string recursively and re-use for query
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Thank you, David :)
I was under the impression that I had to use QUERY(x) to query mongo, but
good to know that I can use BSON(x) instead.
for example: instead of conn.query(dbName, QUERY(x));
I can use conn.query(dbName, BSON(x));


 
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David Hows  
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 More options Sep 20 2012, 7:11 pm
From: David Hows <david.h...@10gen.com>
Date: Thu, 20 Sep 2012 16:11:43 -0700 (PDT)
Local: Thurs, Sep 20 2012 7:11 pm
Subject: Re: build BSON string recursively and re-use for query
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Absolutely correct.

Both the QUERY macro and the BSON macro provide a BSONObj data type.

Cheers,

David


 
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