Spring Data MongoDB - Spring Web Services - Parent - SpringSource

please define productname in your docbook file!Querying documents in a collectionWe saw how to retrieve a single document using the findOne and findById methods on MongoTemplatein previous sections which return a single domain object. We can also query for a collection of documentsto be returned as a list of domain objects. Assuming that we have a number of Person objects with nameand age stored as documents in a collection and that each person has an embedded account documentwith a balance. We can now run a query using the following code.import static org.springframework.data.mongodb.core.query.Criteria.where;import static org.springframework.data.mongodb.core.query.Query.query;…List result = mongoTemplate.find(query(where("age").lt(50).and("accounts.balance").gt(1000.00d)),Person.class);Example 5.14 Querying for documents using the MongoTemplateAll find methods take a Query object as a parameter. This object defines the criteria and options usedto perform the query. The criteria is specified using a Criteria object that has a static factory methodnamed where used to instantiate a new Criteria object. We recommend using a static import fororg.springframework.data.mongodb.core.query.Criteria.where and Query.query tomake the query more readable.This query should return a list of Person objects that meet the specified criteria. The Criteria classhas the following methods that correspond to the operators provided in MongoDB.As you can see most methods return the Criteria object to provide a fluent style for the API.Methods for the Criteria class• Criteria all (Object o)Creates a criterion using the $all operator• Criteria and (String key) Adds a chained Criteria with the specified key to the currentCriteria and retuns the newly created one• Criteria andOperator (Criteria... criteria)Creates an and query using the $andoperator for all of the provided criteria (requires MongoDB 2.0 or later)• Criteria elemMatch (Criteria c) Creates a criterion using the $elemMatch operator• Criteria exists (boolean b) Creates a criterion using the $exists operator• Criteria gt (Object o)Creates a criterion using the $gt operator• Criteria gte (Object o)Creates a criterion using the $gte operator• Criteria in (Object... o) Creates a criterion using the $in operator for a varargs argument.• Criteria in (Collection collection) Creates a criterion using the $in operator usinga collection• Criteria is (Object o)Creates a criterion using the $is operator• Criteria lt (Object o)Creates a criterion using the $lt operator• Criteria lte (Object o)Creates a criterion using the $lte operator1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 45