spring hibernate session

be permanently saved (such as a disk). Can be in the form of files, databases, and XML. Off-State (Detached): When the session associated with a persistent object is closed, the persisted object is turned into a de-tube object. When the off-tube object is re-associated to the session, it is again transformed into a persistent object. Here I would like to summarize a bit about the instantaneo

The session interface is the most important interface that hibernate provides to the program to manipulate the database, and is a single-threaded object that provides basic methods for saving, updating, deleting, and querying. It has a cache that holds persisted objects and updates the database as they are synchronized when the cache is cleaned up.Note: Some methods of the

Spring and Hibernate integrationSteps1) Introduction of JAR PackageConnection pool/Database driver packageHibernate-related JAR packagesSpring core packages and AOP packagesSpring-ormSpring-tx2) configurationHibernate.cfg.xmlBean.xml3) BuildPackage com.cx.entity;/** * Created by Cxspace on 16-8-11. */public class Dept { private int id; private String name; public int getId () { return ID;

@ Manytoone (fetch = fetchtype. Lazy) Exception in lazy loading: org. hibernate. lazyinitializationexception: cocould not initialize proxy-No session I thought it was my configuration problem. I tested it for a long time and found the problem: When spring security is used, the server is started to inject basedao queries. Because the request query is not passed

The Web project will be session-held through sessions, which are stored in server memory; Now in order to improve the performance and stability of the site, the Web project published to multiple servers, through proxy such as Nginx or F5 do load balancing; Due to the normal configuration of load balancing, the client requests are randomly forwarded to a server, which causes the session to be lost;

the database to the cache!Note: Because the transaction mechanism of the database, in the same transaction, will ensure the atomicity of the operation, so in addition to the data, the Refresh () method is not refreshed, not this method has a problem, but the database isolation mechanism, Oracle has two isolation mechanisms, MySQL has four isolation mechanisms, As long as MySQL is set to repeatable read, you can look up the latest data!Three: Clear ()This method will erase all the current caches

Previously, SessionFactory sf = conf. buildSessionFactory () was recommended by the IDE not to continue using it. Now, the best way for hibernate to get the session is to use: The code is as follows:Copy code Package org. Rudiment. hibernate;Import org. Rudiment. hibernate. News;Import org.

Spring provides great support for Hibernate integration. Spring provides initialization for sessionfactory, So you no longer need to worry about session open and close. Spring also provides flexible transaction declarations. This article describes how to integrate

Struts: Responsible for the display layer, is a perfect MVC implementation, it calls the business layer to complete the operational logic, the business layer calls the persistence layer to complete the database read and write.Hibernate: Creates a series of persisted classes that correspond to the properties of each class to the database table's property one by one.Spring: relies on injection and control inversion. As soon as you get a class that implements this interface, you can easily inject t

exception is thrown.-REQUIRES_NEW: always creates new transactions.-NOT_SUPPORTED: if a transaction exists, the transaction is suspended and non-transaction operations are continuously performed.-NEVER always executes non-transactions. If the current transaction exists, an exception is thrown.-NESTED embedded transactions 9. Differences between update () and saveOrUpdate () in Hibernate.From hibernate instructions:SaveOrUpdate () Does the following:I

Sourcefolder, create an identical packageEnter the following code Packagecom.hibernate;Import Staticorg.junit.assert.*;Importjava.util.Date;Importorg.hibernate.Session;Importorg.hibernate.SessionFactory;Importorg.hibernate.cfg.AnnotationConfiguration;Importorg.hibernate.cfg.Configuration;Importorg.junit.Test; Public classTest {@Test Public voidTest () {User U=Newuser (); U.setname ("Ni"); Configuration CFG=Newannotationconfiguration (). Configure (); Sessionfactory SF=cfg.configure (). Buildses

The main function of the session is to provide the creation, read, and delete operations of the mapped entity class instance. The instance may exist in the following three states:Temporary state (transient): Never persisted, not associated with any sessionPersistent State (persistent): associated with only one sessionOff-State (detached): persisted, but not currently associated with any session1, the instance obtained by the Get () or load () method i

instantiate the private date date1;// Using the Date object directly, you need to instantiate the @Test public void Testico () { SYSTEM.OUT.PRINTLN (date); The output System.out.println (date1) of the Bean injection object; Date1=new Date (); System.out.println (date1); System.out.println (date1); }}The output results are as follows:Sat Jul 16:38:26 CST 2016NullSat Jul 16:38:26 CST 2016Sat Jul 16:38:26 CST 2016You see the results, we must under