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⊙JPA:JPA itself is an ORM specification, not an ORM product. It is the result of Java EE spec makers learning from the open source world. JPA entities are very similar to Hibernate po, and even JPA entities can be used entirely as Hibernate PO classes, so many places also refer to Hibernate PO as an entity. Compared to
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In the actual development process, many users need to sort and display the query results as needed, instead of displaying the results in a disordered order in the database, in this case, we have to sort the data. hibernate provides good support for data sorting. hibernate provides two types of sorting for the queried data results: 1: Database sorting, that is to say, the sorting is completed within the data
() method uses the object to delay loading, because only the session. the load () method returns the proxy class Object of the object class.
B. Delayed loading of Collection types In the delayed Loading Mechanism of hibernate, it is of the most significant significance for the application of the set type, because it may greatly improve the performance, so hibernate has made a lot of efforts, this includes
Hibernate, one of the three frameworks of SSH, is used to deal with the Dao layer of the program and the database. It encapsulates the JDBC steps and makes database operations easier and faster. With the Hibernate framework, we can stop writing repeated JDBC code and repeatedly test how our SQL statements are written. Here, we need simple configuration. by callin
SSH Overview: The latest version of Struts2, Hibernate, Spring framework of a consolidation, including the latest version of the jar, Tomcat, simple testing is a general stable framework.
Second, the following is the name of the framework, the version, and the time of the last release
1, Struts2
1. Sturts2 version
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Session ca
The hibernate framework mainly implements the mapping between the database and the entity class, and makes the operation of the entity class quite similar to the Operation Hibernate framework.
As long as the entity class write good Configuration file, you can implement and database mapping, where the entity class corre
Build on the previous project Springdemo and integrate hibernate into your project.1, import hibernate required jar package, here I use the Hibernate3.3.2 version.These packages are mainly imported: Antlr-2.7.6.jar, Commons-collections-3.1.jar, Dom4j.jar, Ejb3, Hibernate3.jar, Hibernate-annotations, Hibernate-common-an
- Propertyname= "Connection.useunicode">True Property> connection.characterencoding the transmission character set encoding of data when connecting to a database - Propertyname= "Connection.characterencoding">UTF-8 Property> Hibernate.dialect is only the database dialect used by hibernate, which is to use Hibernate to connect to that type of database server. - Specify the mapping fi
classes can also override the Equals (object O) method of the object class to achieve comparison by object values. For example, in the Customer class, add the following equals (Object O) method so that it compares the two customer objects for equality by the client's name:public Boolean equals (Object o) {if (this = = O) return true ; if (!o instanceof Customer) return false ; final Customer other = (customer) O; if (this . GetName (). Equals (Other.getname ()))
Spring MVC uses the features that Hibernate validator Framework can implement:1. Annotate Java Bean Declaration validation rules.2. Add a message error message source for internationalization configuration.3. Display the error message with the errors tag in spring form.Advantage:The code is concise.Realize:1. Use Hibernate
previously controlled the object, the managed object also has Hibernate's identity OID for distinguishing objectsManually specifying an OID for an instantaneous object can also convert an instantaneous object to a managed objectInstantaneous state: Instantaneous objectPersistent Identity OID does not exist and is not affected by Hibernate control (Session association)Persisted state: Persisted objectPersistent identity OID exists,
Recently in The imitation of a bookstore website: http://www.yousuu.com, the UI directly to use, the front-end back-end to write their own, most of the functions have been achieved,
The specific login registration function to share. PS: Also write login registration will not be sprayed AH =. =
I. Deployment of the development environment
Program Structure:
Bootstrap+ajax+struts2+hibernate+mysql
For reference only: to achieve the relevant function
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