We will use Hibernate as the persistence provider, you may decide to use other ones. This post resembles Spring 4 MVC Hibernate Many-to-many JSP Example. Valid; import org.springframework.beans.factory.annotation. Only difference between these two is that current one is pure JPA, while the previous one was specific to Hibernate. User; @Service("user Service") @Transactional public class User Service Impl implements User Service package com.websystique.springmvc.controller; import
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Being standard JPA does gives you an upper hand if you have to switch the provider one day.
User Profile; import com.websystique.springmvc.service. User Profile Service; /** * A converter class used in views to map id's to actual user Profile objects. Abstract Annotation Config Dispatcher Servlet Initializer; public class App Initializer extends Abstract Annotation Config Dispatcher Servlet Initializer Now build the war (either by eclipse as was mentioned in previous tutorials) or via maven command line( mvn clean install). Since here i am using Tomcat, i will simply put this war file into tomcat webapps folder and click on inside tomcat/bin directory. If you appreciate the effort I have put in this learning site, help me improve the visibility of this site towards global audience by sharing and linking this site from within and beyond your network.
Jstl View; import com.websystique.springmvc.converter. Role To User Profile Converter; @Configuration @Import(Jpa Configuration.class) @Enable Web Mvc @Component Scan(base Packages = "com.websystique.springmvc") public class App Config extends Web Mvc Configurer Adapter package com.websystique.springmvc.configuration; import org.servlet.support. I would love to hear your thoughts on these articles, it will help me improve further our learning process.
Cascade is a very convenient feature to manage the state of the other side automatically.
However this feature come with a price, if you do not use it wisely (update or delete), it will generate many unnecessary cascade effects (cascade update) to slow down your performance, or delete (cascade delete) some data you didn’t expected.
Additionally, thanks to , Spring can scan the annotated classes for Entities, means is not necessarily required.
Finally, we are referring to Jpa Transaction Manager instead of any implementation specific transaction manager.
In JPA, Entity Manager is the primary interface used to interact with the persistence context managing your entities. Driver = jdbc:mysql://localhost:3306/websystique jdbc.username = myuser jdbc.password = mypassword hibernate.dialect = org.hibernate.dialect. create table APP_USER ( id BIGINT NOT NULL AUTO_INCREMENT, sso_id VARCHAR(30) NOT NULL, password VARCHAR(100) NOT NULL, first_name VARCHAR(30) NOT NULL, last_name VARCHAR(30) NOT NULL, email VARCHAR(30) NOT NULL, PRIMARY KEY (id), UNIQUE (sso_id) ); create table USER_PROFILE( id BIGINT NOT NULL AUTO_INCREMENT, type VARCHAR(30) NOT NULL, PRIMARY KEY (id), UNIQUE (type) ); CREATE TABLE APP_USER_USER_PROFILE ( user_id BIGINT NOT NULL, user_profile_id BIGINT NOT NULL, PRIMARY KEY (user_id, user_profile_id), CONSTRAINT FK_APP_USER FOREIGN KEY (user_id) REFERENCES APP_USER (id), CONSTRAINT FK_USER_PROFILE FOREIGN KEY (user_profile_id) REFERENCES USER_PROFILE (id) ); /* Populate USER_PROFILE Table */ INSERT INTO USER_PROFILE(type) VALUES ('USER'); INSERT INTO USER_PROFILE(type) VALUES ('ADMIN'); INSERT INTO USER_PROFILE(type) VALUES ('DBA'); commit; package com.websystique.springmvc.service; import Service; import org.springframework.transaction.annotation. List; import org.springframework.beans.factory.annotation.
Entity Manager instances itself are generated using JPA Entity Manager Factory. My SQL5Dialect hibernate.hbm2ddl.auto=create-drop hibernate.show_sql = true hibernate.format_sql = true package com.websystique.springmvc.dao; import List; import org.springframework.beans.factory.annotation.
Query q = session.create Query("from Stock where stock Code = :stock Code "); Parameter("stock Code", "4715"); Stock stock = (Stock)q.list().get(0); for (Stock Daily Record sdr : Stock Daily Records()) session.delete(stock); In above cascade delete option, if you delete a Stock , all its referenced ‘stock Daily Records’ will be deleted from database as well.