hibernate framework java

helped us solve. We developers only need to call the Sf.getcurrentsession () method to get the session object bound to the current thread4. Note 1: Calling the Getcurrentsession method must match a section of the configuration in the master configurationNOTE 2: The session object is obtained by the Getcurrentsession method. When a transaction commits, the session is automatically closed. Do not call close manually.Batch queries in Hibernate (overview

Hibernate Framework IntroductionHibernate is an object-relational mapping solution under the Java language. It is a free, open source software issued using the GNU Wide general Public License. It provides an easy-to-use framework for the mapping of object-oriented domain models to traditional relational databases.

Hibernate vs. MyBatis 1. Brief introductionHibernate:hibernate is one of the most popular ORM frameworks available today, providing a more complete package for JDBC. Hibernate's O/R mapping implements the mapping between Pojo and database tables, as well as the automatic generation and execution of SQL.Mybatis:mybatis is also a very popular ORM framework, and the main focus is on the mapping relationship be

delete themselves, there will be an exception. PublicClass App {Privatestatic sessionfactory sessionfactory = ... //delete objects, impact on associated objects @Test public void testdelete () {Session session = Sessionfactory.opensession (); session.begintransaction (); //-------------------------------------------//remove teacher Span class= "Hljs-comment" >//A, if there is no associated opposite party: can delete //B, if there is an associated opposite party and Inverse=false, because

Preface reprint Please indicate source: http://www.cnblogs.com/smfx1314/p/7795837.htmlThis project is an exercise I wrote to review the integration and use of the SSH framework. Project Introduction: This project mainly has the front desk administrator through the login to enter the Employee Management System page, then can the employee list carries on the general deletion and modification investigation. And the list of departments and additions and d

JDBC is used to connect databases and manipulate data, and hibernate encapsulates JDBC (note that manipulating the data rather than manipulating the database, DDL is the database manipulation language, such as CREATE table, for example, the DDL language).The ORM (object relationship Mapping) object-relational mapping is the core of hibernate.Mapping between an entity class and a database tableThe concept of object-oriented concept oriented relationshi

The concept persistence framework saves objects to the database and curd operations on the dataConfigure Hibernate1. Introduction of Hibernate jar package in the projectImporting jar packages under the Webcontent/web-inf/lib directory2. Create Hibernate.cfg.xml under Java Resources and fill in the appropriate informationCreate:Configuration:Modify Hibernate.cfg.x

Original article: http://jansel.javaeye.com/blog/104509 // Comment: the framework is good, but it takes several seconds to display the result. Although I am still in the entry stage for the Java part, I think the framework is comfortable to use, but there is no doubt that it will increase the system link and slow the query.Your own search engine:

Hibernate is an open-source object-relational mapping framework that provides JDBC with a very lightweight object encapsulation that allows Java programmers to manipulate databases at will using object programming thinking. Hibernate is an excellent persistence framework Wha

to set the number of bulk searches for a deferred retrieval policy or an immediate retrieval policy. Bulk retrieval can reduce the number of SELECT statements and improve the performance of deferred or immediate retrieval operations.　　　　4. Multiple-to-one and single-to-a-link retrieval strategies1) As with 　　2) If the Fetch attribute is set to join, then the Lazy property is ignored 3) The advantage of an urgent left outer connection retrieval strategy is that fewer SELECT statements are used

without reference to any framework, we will continue to operate the database through trivial code, resulting in a lot of redundant but regular low-level code, so the frequent operation of the database and a large number of low-level code of repeated writing greatly wasted the program staff's writing, in such a case, The hibernate framework emerged.In fact,

Struts2 + Spring + Hibernate implement the add, delete, modify, and query functions of employee management (1) Integrate the ssh framework and struts2ssh Preface reprinted please indicate the source: http://www.cnblogs.com/smfx1314/p/7795837.html This project is an exercise I wrote to review the integration and use of the ssh framework. Project Description: a fro

(i) Integration of spring and hibernate frameworks key points of integration: (1) The data source is configured in the spring configuration file for use by the spring and hibernate frameworks; (2) The Hibernate.hbm.xml configuration file is no longer needed, and the hibernate run-time parameters and mapped XML file resources in the corresponding entity classes ar

other is Net.sf.ehache. Hibernate is integrated with Net.sf.ehcache. So you should download Net.sf.ehcache. Hibernate is not supported if you are using the Org.ehcache jar package: Download down the jar package, need to put in the project, in this case, is placed in the Webroot/web-inf/lib directory of the Sshwebproject project, it is important to note that Ehcache.jar package depends on Commons-logging.ja

previously controlled the object, the managed object also has Hibernate's identity OID for distinguishing objectsL manually specify an OID for instantaneous objects can also convert instantaneous objects to managed objectsL Instantaneous state: instantaneous objectThere is no persistent identity OID and is not under Hibernate control (Session association)L Persistent State: persisted object? Persistent identity OID exists,

If you envy Ruby on Rails, you can use dynamic languages for coding, but you are reluctant to use the Java er frameworks such as spring and hibernate, there is a compromise:We still use the spring + Hibernate framework, and use groovy/Jython/jruby to write controller classes, service classes, and Dao classes, and compi

Hibernate is very uncertain when writing database configuration files and must be tested to ensure the correctness of the database structure. So you can apply junit for testing.Using JUnit is very simple, and eclipse just needs to create a new junit test case for the right-click Project (fill in the class name and package name). Then write the corresponding code in the corresponding location to run the test.A common

Second-level cacheFirst, the introduction1. Hibernate-Provided cacheThere is a first-level cache, a level two cache. The purpose is to reduce the number of accesses to the database and to improve the efficiency of program execution. 2, first-level cache:1) session-based cache, cached content only valid at the current session, session closed, cache content is invalid.2) Features:A) The scope of the action is small. Cache time is short.b) The cache effe

without reference to any framework, we will continue to operate the database through mediocre code, resulting in a very large number of redundant but regular low-level code, so the frequent operation of the database and a large number of low-level code of repeated writing greatly wasted the program staff's writing. In such a case, the hibernate framework emerges.