morphia

Description of the method (1) Sorting of a field For example Onumber Word orderby order Query.with (New Sort (DIRECTION.ASC, "Onumber")); (2) If multiple fields are in ascending or descending order Sort Query.with (New Sort (DIRECTION.ASC, "a", "B", "C")); (3) Different fields are sorted according to different List a ascending in descending order B Step three: Test class @Test public void Testlist () throws ParseException { pagemodel Query condition is cn

fieldsuch as Onumber word orderby sequenceQuery.with (New Sort (DIRECTION.ASC, "Onumber"));(2) Assuming that multiple fields are ascending or descending at the same timeSortQuery.with (New Sort (DIRECTION.ASC, "a", "B", "C"));(3) Different fields are sorted according to different List a ascending in descending order BStep three: Test class @Test public void Testlist () throws ParseException { pagemodelQuery condition is cname=zcy The Skip method is to skip the num

Morphia Introduction With the rise of internet web2.0 website, the traditional relational database in dealing with web2.0 website, especially the super large-scale and high concurrent SNS type web2.0 pure dynamic website already appeared to be powerless, exposed many insurmountable problems, but the relational database is very rapid development because of its own characteristic. The production of NoSQL database is to solve the challenge of multiple d

Classes that are @entity annotations must have a unique @Id value, which is stored in the id attribute of the MongoDB database, which is a required index. Like in the Hotel class: @Entity public class hotel{ @Id Private ObjectId ID; ..... } As shown above: The ID of the @id annotation is objectid type, so that you don't have to worry about the ID generation problem, MONGO will automatically generate a A unique new Objectid object (for the ID of the auto_increment type in MySQL). If

; Import com.mongodb.MongoClient; public class Demo {public static void Main (string[] args) { Morphia Morphia = new Morphia (); Tell Morphia where to find your class //Can make multiple calls to different packages or classes morphia.mappackage ("Mongodbdemo"); Create Datasto

you want to read them as their base class or superclass. If the class name is not saved in the document, morphia cannot correctly identify the class to be created. For example: [Java]View plaincopy @ Entity ("Animals") abstract class animal {string name ;} @ Entity ("Animals") cat extends animal {...} @ Entity ("Animals") Dog extends animal {...} // And then locking Ming the following query... List @ ID@ ID: annotate the value as the uni

Com.google.code.morphia.annotations.Property; @Entity public class Blogentry { @Id private ObjectId Id; Private String title; Private Date publishdate; Private String body; @Reference private Author Author; Getters and Setters } ... @Entity public class Author { @Id private ObjectId Id; Private String username; Private String fullName; Private String EmailAddress; Getters and Setters }When using references, it is important to ment

Spring + Mongo + Morphia ConfigurationSpring Configuration Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" Xsi: schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> Java DAO @ Repository Public class UserEntityDAO extends BasicDAO @ Autowired Protected UserEntityDAO (Datastore dataStore ){ S

Mongodb Java DriverAlthough MongoDB provides Java driver, if we use driver to do MongoDB operation directly, the code redundancy is many, the use is not convenient, error prone. This is just like the way we use SQL to manipulate databases directly in an RDBMS, most of the time we don't advocate this, and more often we use MyBatis or hibernate to do ORM. Is there such a tool in MongoDB to help us complete the ODM?There are many, here we introduce the use of M