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When a session is obtained by inheriting the hibernatedaosupport class, the following benefits are provided:
If you are not familiar with the session, please first look at the session
1): Because hibernatedaosupport already has the getsession () method for obtaining the session, you can directly use
Java.lang.IllegalStateException:Pool not openWhen using spring for system development, database connections are typically configured in spring's configuration file and are managed by spring. This is also true when developing with Spring + hibernate. The following is an example of a simple
https://www.zhihu.com/question/21142149http://how2j.cn/k/hibernate/hibernate-tutorial/31.html?tid=63https://www.zhihu.com/question/29444491/answer/1464577571. Java-struts Framework TutorialStruts is an open source project sponsored by the Apache Software Foundation (ASF). By adopting JAVASERVLET/JSP technology, the application framework of MVC design pattern based on Java eeweb application is realized, and
to this approach, which is the need to decouple the code of the servlet container such as Tomcat/jetty.2, design a filter, using Httpservletrequestwrapper, to achieve their own getsession () method, take over the creation and management of session data work. Spring-session is realized by this way of thinking.A preliminary study on
When Hibernate and spring are consolidated, the following is commented out in the contents of the Hibernate.cfg.xml file specified in spring:In this way, the Hibernate session can be administered to spring, and spring can be used
,Orderminimumamountexception;Public abstract List Findorderbyuser (String user)Throws Orderexception;Public abstract Order Findorderbyid (int id)Throws Orderexception;public abstract void Setorderdao (Iorderdao Orderdao);}Note that the preceding code has a setter method prepared for the DAO object. There is not a Getorderdao method here because it is not necessary because there is not much need to access the attached Orderdao object from the outside. The DAO object will be used to communicate wi
Order Saveneworder (order)Throws Orderexception,Orderminimumamountexception;Public abstract List Findorderbyuser (String user)Throws Orderexception;public abstract order Findorderbyid (int id)Throws Orderexception;public abstract void Setorderdao (Iorderdao Orderdao);}
Note that the above code has a setter method prepared for the DAO object. There is no Getorderdao method because it is not necessary because there is no need to access the attached Orderdao object from the outside. DAO
note that Hibernate's session differs from the HttpSession in JSP applications. When we use the term session, we refer to the session in Hibernate, and we will later call the Httpsesion object the user session.Sessionfactory interface: The Sessionfactroy interface is responsible for initializing
and connections early, and the view can be loaded by lazy load.Spring supports this out-of-the-way pattern, with org.springframework.orm.hibernate.support.OpenSessionInViewFilter (which can be used with any web-tier technology) or Opensessioninviewinterceptor (used with the spring's web MVC framework).These two implementations of spring support two modes of operation: Single session mode and deferred shutd
interface IOrderService {public abstract Order Saveneworder (order)Throws Orderexception,Orderminimumamountexception;Public abstract List Findorderbyuser (String user)Throws Orderexception;public abstract order Findorderbyid (int id)Throws Orderexception;public abstract void Setorderdao (Iorderdao Orderdao);}
Note that the above code has a setter method prepared for the DAO object. There is no Getorderdao method because it is not necessary because there is no need to access the attache
This is your own reference Springside Integration Framework for open source projects. The main integration of spring, Spring MVC, Spring data JPA, hibernate several frameworks, still feel more comfortable in these frameworks spring data JPA the framework, the framework for w
This is your own reference to the Springside Open source Project Integration Framework, the main integration of spring, Spring MVC, Spring data JPA, hibernate these frameworks, for these frameworks it feels more comfortable or spring data JPA this framework, when writing the
the session is a conversation between the application and the database, and its importance is self-evident. beginner Hibernate, use Sessionfactory, honestly open transactions, commit, Rollback, close session.1. Build the Session object directly through Sessionfactory ( with opensession () or getcurrentsession ()), a
How does hibernate work and why should I use it?
Principle:
Read and parse the configuration file
Read and parse mapping information, create Sessionfactory
Open Sesssion
Create Transaction Transation
Persistent operations
Commit a transaction
Close session
Close Sesstionfactory
, and if you remove the lazy load, then the cost of each query becomes very large, if the association table more, the consequences can be imagined. So it is not recommended to use this method to solve.2), before the session closed before the data we want to query first obtained. The first thing you need to know is when the session closes, which is its life cycle. Normally
Hibernate -- Session, hibernatesession
I. Overview
Session is the main interface that Hibernate provides to applications to manipulate data. It provides basic methods for saving, updating, deleting, and loading Java objects.
Ii. Session cache
1. Introduction
(1)
1. Manage sessionfactory
When we use spring to integrate hibernate, we do not need the hibernate. cfg. xml file. First, configure the data source bean and session factory bean in applicationcontext. xml. When configuring the session factory bean, the following information sh
thread several times to open and close the session, wasting system resources and affect the efficiency of execution, under normal circumstances still do not use.Hibernate's Sessionfactory provides a new way to get the session getcurrentsession (gets the session bound to the current thread). Internally encapsulated by proxy, this method gets the sessionNot only i
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