Spring Data MongoDB - Spring Web Services - Parent - SpringSource

More documents

Recommendations

Info

please define productname in your docbook file!5.4 Introduction to MongoTemplateThe class MongoTemplate, located in the packageorg.springframework.data.document.mongodb, is the central class of the Spring's MongoDBsupport providng a rich feature set to interact with the database. The template offers convenienceoperations to create, update, delete and query for MongoDB documents and provides a mappingbetween your domain objects and MongoDB documents.NoteOnce configured, MongoTemplate is thread-safe and can be reused across multiple instances.The mapping between MongoDB documents and domain classes is done by delegating toan implementation of the interface MongoConverter. Spring provides two implementations,SimpleMappingConverter and MongoMappingConverter, but you can also write your ownconverter. Please refer to the section on MongoCoverters for more detailed information.The MongoTemplate class implements the interface MongoOperations. In as much as possible,the methods on MongoOperations are named after methods available on the MongoDB driverCollection object as as to make the API familiar to existing MongoDB developers who are used tothe driver API. For example, you will find methods such as "find", "findAndModify", "findOne", "insert","remove", "save", "update" and "updateMulti". The design goal was to make it as easy as possible totransition between the use of the base MongoDB driver and MongoOperations. A major difference inbetween the two APIs is that MongOperations can be passed domain objects instead of DBObject andthere are fluent APIs for Query, Criteria, and Update operations instead of populating a DBObjectto specify the parameters for those operatiosn.1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 33
please define productname in your docbook file!NoteThe preferred way to reference the operations on MongoTemplate instance is via its interfaceMongoOperations.The default converter implementation used by MongoTemplate is MongoMappingConverter. While theMongoMappingConverter can make use of additional metadata to specify the mapping of objects todocuments it is also capable of converting objects that contain no additonal metadata by using someconventions for the mapping of IDs and collection names. These conventions as well as the use ofmapping annotations is explained in the Mapping chapter.NoteIn the M2 release SimpleMappingConverter, was the default and this class is now deprecatedas its functionality has been subsumed by the MongoMappingConverter.Another central feature of MongoTemplate is exception translation of exceptions thrown in the MongoDBJava driver into Spring's portable Data Access Exception hierarchy. Refer to the section on exceptiontranslation for more information.While there are many convenience methods on MongoTemplate to help you easily perform commontasks if you should need to access the MongoDB driver API directly to access functionality notexplicitly exposed by the MongoTemplate you can use one of several Execute callback methodsto access underlying driver APIs. The execute callbacks will give you a reference to either acom.mongodb.Collection or a com.mongodb.DB object. Please see the section ExecutionCallbacks for more information.Now let's look at a examples of how to work with the MongoTemplate in the context of the Springcontainer.Instantiating MongoTemplateYou can use Java to create and register an instance of MongoTemplate as shown below.@Configurationpublic class AppConfig {public @Bean Mongo mongo() throws Exception {return new Mongo("localhost");}}public @Bean MongoTemplate mongoTemplate() throws Exception {return new MongoTemplate(mongo(), "mydatabase");}Example 5.6 Registering a com.mongodb.Mongo object and enabling Spring's exception translationsupportThere are several overloaded constructors of MongoTemplate. These are• MongoTemplate (Mongo mongo, String databaseName) - takes the com.mongodb.Mongoobject and the default database name to operate against.1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 34
Page 1 and 2: Spring Data MongoDB - Reference Doc
Page 3 and 4: please define productname in your d
Page 11: please define productname in your d
Page 88 and 89:
please define productname in your d
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104:
show all

Spring Data MongoDB - Spring Web Services - Parent - SpringSource

Create successful ePaper yourself

Delete template?

Save as template?