2013-09-05 23:07:11 +08:00
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Format classes are required to expose a constructor with no arguments,
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a getFileExtension() and a sendResponse(opts, callback) method.
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2013-05-27 17:21:56 +08:00
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The ``opts`` parameter contains:
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sink Output stream to send the reponse to
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sql SQL query requested by the user
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skipfields Comma separate list of fields to skip from output
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really only needed with "SELECT *" queries
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gn Name of the geometry column (for formats requiring one)
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dp Number of decimal points of precision for geometries (if used)
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database Name of the database to connect to
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user_id Identifier of the user
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filename Name to use for attachment disposition
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The ``callback`` parameter is a function that is invoked when the
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format object finished with sending the result to the sink.
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If an error occurs the callback is invoked with an Error argument.
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