spring hibernate session

The session represents a connection in hibernate. Here are some of his common methods.Say the most important thing before you use it. Open the API and discover that all of the basic methods in the session (including the method of getting the session) will throw an exception Hibernateexception,hibernateexception excepti

First, a graph is used to illustrate an object, in Hibernate, the different states of an object after a different method is called In Hibernate, the state of an object can be divided into three types as shown in the figure Transient: Instantaneous object that does not have a corresponding record in the database, and that object is not associated with session

The session. Load/get method can read records from the database based on the specified object class and ID, and return the corresponding object. The difference is: If no matching record is found, the get method returns NULL, and the load method throws an objectnotfoundexception. The load method returns the proxy class instance of the object, while the get method returns the object class directly. The load method can make full use of the

analysis method, we propose some models, implement these models as basic Java objects, and then write the basic DAO (Data Access Objects) interface, and give the DAO implementation of Hibernate. The DAO class implemented by the hibernate architecture implements conversion and access between Java classes and databases, and finally manages struts and hibernate wit

Original http://blog.csdn.net/skmbw/article/details/12650827 Fastjson serialization Hibernate proxy and deferred load object appears org.hibernate.LazyInitializationException:failed to lazily initialize a collection of Role:com.eecn.warehouse.api.model.Tags.childTags, could not initialize proxy-no session. For this extension point that can be given using Fastjson, implement the PropertyFilter interface and

Using annotations in the classes to be used @PersistenceContext private Entitymanager Entitymanager; In the code you can use the following to get Hibernateentitymanager Hentitymanager = (hibernateentitymanager) Entitymanager; Session session = Hentitymanager.getsession (); When we use set operations on objects in the container, we do not want to persist the set data, but

Today we know that the session is not just a conversation, it is also a core of hibernate.Hibernate how to use it ...First of all, go ahead and create this one, I don't know what this is.The second step is to install the hibernate instance in the project, it is recommended that you have a way to import the jar package, but MyEclipse has its own creation ~, and do not forget to import the database-driven jar

= "Servicecid">3 resultname= "Success">/updatesercate.jspresult>4 Action>Click "Modify" after the completion of the jump to the update page, the page is now available to update the entity's ID number. As follows:Idea 2: the same value in the URL, in the new page with JS to get the value. The idea has not been implemented yet, but it feels feasible. Pending inspection.Summary : The front-end page transfer value, the front and rear end of the value is often encountered scene, here I use the ac

The Get () and load () methods provided by the session interface in Hibernate are used to obtain an entity object, with some differences in usage and query performance.GetThe session interface provides 4 overloaded get methods that obtain entity objects through persistent class + primary key and full class name + primary key and lock options.public object get (cl

Today, while learning hibernate, the following error occurred:Error Analysis:If we take a single object with the Get method there is no problem, but if the object we are fetching has an associated object, it is problematic with get, because it does not take the associated object outReference blog:Do me a little harder!Do me a little harder!Lazy Loading principle:Lazy-loaded objects are rewritten proxy objects, and when the associated

doesn't mean that spring and struts integrateIt's a spring HelloWorld.Next, we need to add a listener to the Web. xmlNew Web. xmlclass>org.springframework.web.context.contextloaderlistenerclass> class>org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilterclass> /*And then join in a Struts2-spring-plugin-2.1.8.1.jarChange the class property of the

First, Sessionfactory is thread-safe, and Sessionfactory uses the factory model.It takes a lot of resources to create and destroy, so a database in an application typically corresponds to only one sessionfactory.The Sessionfactory interface provides a way to get an instance of the session class.There are generally two ways to create session instances:1, Getcurrentsession Method:Session instances created wit

Spring Boot series (vii) Spring boot uses Redis for session sharing This article describes spring boot using the Redis implementation session sharing, need springboot actual combat full video tutorial, click here. Redis is a cache message middleware and a key-value storage

The flush () method cleans up the cached operation, executes a series of SQL statements, but does not commit the transaction, and the commit () method calls the Flush () method before committing the transaction. Committing a transaction means that updates to the database are persisted forever The so-called cleanup means that hibernate updates the database synchronously in the state of the persistent image. Flush () simply commits the data in

Hibernate manipulation of the database is accomplished by the session object, the Session object represents the database connection to get the session of the method there are two ways: 1) openSession2) getcurrentsession Use the second need to configure in the Hibernate.cfg.xml file: If it is a local transaction (JDBC T

Atitit.spring hibernate transaction mechanism Spring cannot save object resolutionsessionfactory . Open Session ()No.。Log Black horse SQL language :sessionfactory . Getcurrentsession (). Update (user);Middle Walk OK lan . Log blackheads are also tired .Hibernateis used in Spring . Suppose we configured the transacti

Project directory structure: Project StructureStep 1: Prepare the jar package The above are all jar packages required by springmvc + hibernate.Copy all jar packages to the lib directory of the web project.Step 2: configure the file Copy and modify files From HibernateFirst, go to the ETC folder from the project folder in Hibernate and copy the two files to the classpath folder, Figure 2-1 ## HypersonicSQLdataSource.password=dataSource.username=root

Originally wanted to write down spring+springmvc+hibernate integration of the article temporarily do not write the direct attached source code, there is a need for direct download to see it. There are previous articles in the SPRINGMVC source code before the article is simply said to build the environment to access the page successfully. This source code has simulated additions and deletions and file upload

development cost after spring is used. The following figure illustrates the combination of struts and spring.ProgramBasic Process: As shown above, the most important thing for struts to integrate with spring is to change the action-mapping settings in the struts-config.xml and spring gets control before entering the action of struts. Let's talk about the i

In hibernate applications, if you need to directly use Java. SQL. connection. Generally, we use the hibernate session. connection (), and then session. close (), but the connection does not need to be closed. After a period of operation, the query will be very slow, as if it had crashed. The reason is that the