Spring Data MongoDB - Spring Web Services - Parent - SpringSource
Spring Data MongoDB - Spring Web Services - Parent - SpringSource Spring Data MongoDB - Spring Web Services - Parent - SpringSource
please define productname in your docbook file!• MongoTemplate (Mongo mongo, String databaseName, UserCredentialsuserCredentials) - adds the username and password for authenticating with the database.• MongoTemplate (MongoDbFactory mongoDbFactory) - takes a MongoDbFactory object thatencapsulated the com.mongodb.Mongo object, database name, and username and password.• MongoTemplate (MongoDbFactory mongoDbFactory, MongoConvertermongoConverter) - adds a MongoConverter to use for mapping.You can also configure a MongoTemplate using Spring's XML schema.Other optional properties that you might like to set when creating a MongoTemplate are the defaultWriteResultCheckingPolicy, WriteConcern, and ReadPreference.NoteThe preferred way to reference the operations on MongoTemplate instance is via its interfaceMongoOperations.WriteResultChecking PolicyWhen in development it is very handy to either log or throw an exception if thecom.mongodb.WriteResult returned from any MongoDB operation contains an error. It is quitecommon to forget to do this during development and then end up with an application that lookslike it runs successfully but in fact the database was not modified according to your expectations.Set MongoTemplate's WriteResultChecking property to an enum with the following values, LOG,EXCEPTION, or NONE to either log the error, throw and exception or do nothing. The default is to usea WriteResultChecking value of NONE.WriteConcernYou can set the com.mongodb.WriteConcern property that the MongoTemplate will use for writeoperations if it has not yet been specified via the driver at a higher level such as com.mongodb.Mongo.If MongoTemplate's WriteConcern property is not set it will default to the one set in the MongoDBdriver's DB or Collection setting.WriteConcernResolverFor more advanced cases where you want to set different WriteConcern values on a peroperationbasis (for remove, update, insert and save operations), a strategy interface calledWriteConcernResolver can be configured on MongoTemplate. Since MongoTemplate is used topersist POJOs, the WriteConcernResolver lets you create a policy that can map a specific POJOclass to a WriteConcern value. The WriteConcernResolver interface is shown below.public interface WriteConcernResolver {WriteConcern resolve(MongoAction action);}1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 35
please define productname in your docbook file!The passed in argument, MongoAction, is what you use to determine the WriteConcern valueto be used or to use the value of the Template itself as a default. MongoAction contains thecollection name being written to, the java.lang.Class of the POJO, the converted DBObject, aswell as the operation as an enumeration (MongoActionOperation: REMOVE, UPDATE, INSERT,INSERT_LIST, SAVE) and a few other pieces of contextual information. For example,private class MyAppWriteConcernResolver implements WriteConcernResolver {}public WriteConcern resolve(MongoAction action) {if (action.getEntityClass().getSimpleName().contains("Audit")) {return WriteConcern.NONE;} else if (action.getEntityClass().getSimpleName().contains("Metadata")) {return WriteConcern.JOURNAL_SAFE;}return action.getDefaultWriteConcern();}5.5 Saving, Updating, and Removing DocumentsMongoTemplate provides a simple way for you to save, update, and delete your domain objects andmap those objects to documents stored in MongoDB.Given a simple class such as Personpublic class Person {private String id;private String name;private int age;public Person(String name, int age) {this.name = name;this.age = age;}public String getId() {return id;}public String getName() {return name;}public int getAge() {return age;}@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";}}You can save, update and delete the object as shown below.NoteMongoOperations is the interface that MongoTemplate implements.1.4.0.BUILD-SNAPSHOTSpring Data MongoDB -Reference Documentation 36
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please define productname in your docbook file!• MongoTemplate (Mongo mongo, String databaseName, UserCredentialsuserCredentials) - adds the username and password for authenticating with the database.• MongoTemplate (MongoDbFactory mongoDbFactory) - takes a MongoDbFactory object thatencapsulated the com.mongodb.Mongo object, database name, and username and password.• MongoTemplate (MongoDbFactory mongoDbFactory, MongoConvertermongoConverter) - adds a MongoConverter to use for mapping.You can also configure a MongoTemplate using <strong>Spring</strong>'s XML schema.Other optional properties that you might like to set when creating a MongoTemplate are the defaultWriteResultCheckingPolicy, WriteConcern, and ReadPreference.NoteThe preferred way to reference the operations on MongoTemplate instance is via its interfaceMongoOperations.WriteResultChecking PolicyWhen in development it is very handy to either log or throw an exception if thecom.mongodb.WriteResult returned from any <strong>MongoDB</strong> operation contains an error. It is quitecommon to forget to do this during development and then end up with an application that lookslike it runs successfully but in fact the database was not modified according to your expectations.Set MongoTemplate's WriteResultChecking property to an enum with the following values, LOG,EXCEPTION, or NONE to either log the error, throw and exception or do nothing. The default is to usea WriteResultChecking value of NONE.WriteConcernYou can set the com.mongodb.WriteConcern property that the MongoTemplate will use for writeoperations if it has not yet been specified via the driver at a higher level such as com.mongodb.Mongo.If MongoTemplate's WriteConcern property is not set it will default to the one set in the <strong>MongoDB</strong>driver's DB or Collection setting.WriteConcernResolverFor more advanced cases where you want to set different WriteConcern values on a peroperationbasis (for remove, update, insert and save operations), a strategy interface calledWriteConcernResolver can be configured on MongoTemplate. Since MongoTemplate is used topersist POJOs, the WriteConcernResolver lets you create a policy that can map a specific POJOclass to a WriteConcern value. The WriteConcernResolver interface is shown below.public interface WriteConcernResolver {WriteConcern resolve(MongoAction action);}1.4.0.BUILD-SNAPSHOT<strong>Spring</strong> <strong>Data</strong> <strong>MongoDB</strong> -Reference Documentation 35
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