How do I write expressions for Birt with Mongo?

Question

I've found the documentation page http://help.eclipse.org/kepler/index.jsp?topic=%2Forg.eclipse.birt.doc%2Fbirt%2Fds-HowToSpecifyWhatDataToRetrieveDataFromMongoDBDataSource.html which says I can write a Run Database Command expression and The default command type is FindQuery . How do I write a FindQuery expression.

Answer 1

Choose the "$query Expression" button in Edit Data Set window. Then type in the find query that you want... for example if you loaded the MongoDB sample database from http://docs.mongodb.org/manual/tutorial/aggregation-zip-code-data-set/

You can do a find query such as:

{ pop: { $gte: 15000  } }

This searches for all records that have a population greater than or equal to 15000 people. You could also run some of the following find queries:

{ state: { $in: ["WA", "OR" ] } } //finds all of the cities in WA and OR

{$and: [{ state:"WA" },{ pop: { $gte: 50000 } }]} //finds all of the cities in WA with a population greater than 50,000-