JPA is the sun specification for persisting objects in the enterprise application. It is used as replacement for complex entity beans.<\/p>\n
The implementation of JPA specification are provided by many JPA provider such as: Hibernate, Toplink, iBatis, OpenJPA etc.<\/p>\n
Features provided by Spring Data JPA :<\/h4>\n\n- Create and support repositories created with Spring and JPA<\/li>\n
- Support JPA queries<\/li>\n
- Support for batch loading, sorting, dynamical queries<\/li>\n
- Supports XML mapping for entities<\/li>\n
- Reduce code size for generic CRUD operations by using CrudRepository<\/li>\n<\/ul>\n
What Components Do We Need?<\/h4>\n\n- The JDBC driver<\/strong>\u00a0which enables java application to interact with the database.<\/li>\n
- The datasource<\/strong> provides all technical information needed to access data.<\/li>\n
- The JPA Provider<\/strong> implements the Java Persistence API. We use Hibernate because it is the most common JPA provider.<\/li>\n
- Spring Data JPA<\/a> <\/strong>hides the used JPA provider behind its repository abstraction.<\/li>\n<\/ul>\n
The Java Persistence API<\/strong> is used for managing, persisting and accessing data between objects and relation database. Hibernate is an ORM (Object Relational Mapping) tool which implements JPA specification.<\/p>\nFollowing program illustrates how to integrate Spring with JPA, using the Hibernate as a JPA provider :<\/p>\n
Exploring the Directory Structure :<\/h2>\n
![\"Directory](\"https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2018\/05\/Image-1-202x300.png\")
<\/p>\n
pom.xml file :\u00a0<\/strong>Adding Spring, Hibernate and MySQL dependencies in maven project as follows:<\/p>\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 \r\n http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\r\n <modelVersion>4.0.0<\/modelVersion>\r\n\r\n <groupId>com.innovationM.hibernate<\/groupId>\r\n <artifactId>spring-hibernate-jpa-example<\/artifactId>\r\n <version>0.0.1-SNAPSHOT<\/version>\r\n <packaging>jar<\/packaging>\r\n\r\n <name>spring-hibernate-jpa-tutorial<\/name>\r\n <url>http:\/\/maven.apache.org<\/url>\r\n\r\n <properties>\r\n <project.build.sourceEncoding>UTF-8<\/project.build.sourceEncoding>\r\n <\/properties>\r\n\r\n <dependencies>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-context<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-orm<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.hibernate<\/groupId>\r\n <artifactId>hibernate-core<\/artifactId>\r\n <version>5.2.9.Final<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.apache.commons<\/groupId>\r\n <artifactId>commons-dbcp2<\/artifactId>\r\n <version>2.1.1<\/version>\r\n <\/dependency>\r\n <dependency> \r\n <groupId>mysql<\/groupId> \r\n <artifactId>mysql-connector-java<\/artifactId> \r\n <version>6.0.5<\/version> \r\n <\/dependency>\r\n <\/dependencies>\r\n\r\n <build>\r\n <sourceDirectory>src\/main\/java<\/sourceDirectory>\r\n <plugins>\r\n <plugin>\r\n <artifactId>maven-compiler-plugin<\/artifactId>\r\n <version>3.5.1<\/version>\r\n <configuration>\r\n <source>1.8<\/source>\r\n <target>1.8<\/target>\r\n <\/configuration>\r\n <\/plugin>\r\n <\/plugins>\r\n <\/build>\r\n<\/project>\r\n<\/pre>\nJPA Entity class :<\/strong>\u00a0 This is entity class Person<\/strong>\u00a0consists of getter and setter methods.<\/p>\npackage com.innovationM.spring.entity;\r\n\r\nimport javax.persistence.Column;\r\nimport javax.persistence.GeneratedValue;\r\nimport javax.persistence.Entity;\r\nimport javax.persistence.Id;\r\nimport javax.persistence.GenerationType;\r\nimport javax.persistence.Table;\r\n\r\n@Entity\r\n@Table(name = \"PERSONS\")\r\npublic class Person {\r\n\r\n @Id\r\n @GeneratedValue(strategy = GenerationType.IDENTITY)\r\n private Long id;\r\n\r\n @Column(name = \"FIRST_NAME\")\r\n private String firstName;\r\n\r\n @Column(name = \"LAST_NAME\")\r\n private String lastName;\r\n\r\n @Column(name = \"EMAIL\")\r\n private String email;\r\n\r\n public Person() {}\r\n \r\n public Person(String firstName, String lastName, String email) {\r\n this.firstName = firstName;\r\n this.lastName = lastName;\r\n this.email = email;\r\n }\r\n\r\n \/\/getter and setter methods.\r\n}\r\n<\/pre>\nData Access Object (DAO) class :<\/h3>\n
PersonDao.java : <\/strong>This repository interface consists of methods to be implemented by implementation class.<\/p>\npackage com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonDao {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}<\/pre>\nPersonDaoImp.java :<\/strong> This repository class implements PersonDao<\/strong>\u00a0interface to provide method body accordingly as to persist data in database.<\/p>\npackage com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport javax.persistence.EntityManager;\r\nimport javax.persistence.PersistenceContext;\r\nimport javax.persistence.criteria.CriteriaQuery;\r\nimport javax.persistence.criteria.Root;\r\n\r\nimport org.springframework.stereotype.Repository;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Repository\r\npublic class PersonDaoImp implements PersonDao {\r\n\r\n @PersistenceContext\r\n private EntityManager em;\r\n\r\n @Override\r\n public void add(Person person) {\r\n em.persist(person);\r\n }\r\n\r\n @Override\r\n public List<Person> listPersons() {\r\n CriteriaQuery<Person> criteriaQuery = em.getCriteriaBuilder().createQuery(Person.class);\r\n @SuppressWarnings(\"unused\")\r\n Root<Person> root = criteriaQuery.from(Person.class);\r\n return em.createQuery(criteriaQuery).getResultList();\r\n }\r\n\r\n}\r\n<\/pre>\nService class :<\/h3>\n
PersonService.java : <\/strong>This interface consists of methods to be implemented by implementation class at service layer.<\/p>\npackage com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonService {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}\r\n<\/pre>\nPersonServiceImp.java : <\/strong>This service class implements PersonService<\/strong> interface to provide method body accordingly to our business logic.<\/p>\npackage com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.stereotype.Service;\r\nimport org.springframework.transaction.annotation.Transactional;\r\n\r\nimport com.innovationM.spring.dao.PersonDao;\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Service\r\npublic class PersonServiceImp implements PersonService {\r\n\r\n @Autowired\r\n private PersonDao userDao;\r\n\r\n @Transactional\r\n public void add(Person person) {\r\n userDao.add(person);\r\n }\r\n\r\n @Transactional(readOnly = true)\r\n public List<Person> listPersons() {\r\n return userDao.listPersons();\r\n }\r\n\r\n}\r\n<\/pre>\npersistence.xml file :<\/strong> This xml file contains information to connect with database.<\/p>\n<persistence xmlns=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\"\r\n xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\r\n http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\/persistence_2_1.xsd\"\r\n version=\"2.1\">\r\n\r\n <persistence-unit name=\"LOCAL_PERSISTENCE\">\r\n <description> Spring Hibernate JPA Configuration Example<\/description>\r\n <provider>org.hibernate.jpa.HibernatePersistenceProvider<\/provider>\r\n\r\n <properties>\r\n <property name=\"javax.persistence.jdbc.driver\" value=\"com.mysql.cj.jdbc.Driver\" \/>\r\n <property name=\"javax.persistence.jdbc.url\" value=\"jdbc:mysql:\/\/localhost:3306\/demo\" \/>\r\n <property name=\"javax.persistence.jdbc.user\" value=\"root\" \/>\r\n <property name=\"javax.persistence.jdbc.password\" value=\"root\" \/>\r\n <property name=\"hibernate.show_sql\" value=\"true\" \/>\r\n <property name=\"hibernate.hbm2ddl.auto\" value=\"update\" \/>\r\n <\/properties>\r\n\r\n <\/persistence-unit>\r\n<\/persistence><\/pre>\n
What Components Do We Need?<\/h4>\n\n- The JDBC driver<\/strong>\u00a0which enables java application to interact with the database.<\/li>\n
- The datasource<\/strong> provides all technical information needed to access data.<\/li>\n
- The JPA Provider<\/strong> implements the Java Persistence API. We use Hibernate because it is the most common JPA provider.<\/li>\n
- Spring Data JPA<\/a> <\/strong>hides the used JPA provider behind its repository abstraction.<\/li>\n<\/ul>\n
The Java Persistence API<\/strong> is used for managing, persisting and accessing data between objects and relation database. Hibernate is an ORM (Object Relational Mapping) tool which implements JPA specification.<\/p>\nFollowing program illustrates how to integrate Spring with JPA, using the Hibernate as a JPA provider :<\/p>\n
Exploring the Directory Structure :<\/h2>\n
<\/p>\n
pom.xml file :\u00a0<\/strong>Adding Spring, Hibernate and MySQL dependencies in maven project as follows:<\/p>\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 \r\n http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\r\n <modelVersion>4.0.0<\/modelVersion>\r\n\r\n <groupId>com.innovationM.hibernate<\/groupId>\r\n <artifactId>spring-hibernate-jpa-example<\/artifactId>\r\n <version>0.0.1-SNAPSHOT<\/version>\r\n <packaging>jar<\/packaging>\r\n\r\n <name>spring-hibernate-jpa-tutorial<\/name>\r\n <url>http:\/\/maven.apache.org<\/url>\r\n\r\n <properties>\r\n <project.build.sourceEncoding>UTF-8<\/project.build.sourceEncoding>\r\n <\/properties>\r\n\r\n <dependencies>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-context<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-orm<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.hibernate<\/groupId>\r\n <artifactId>hibernate-core<\/artifactId>\r\n <version>5.2.9.Final<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.apache.commons<\/groupId>\r\n <artifactId>commons-dbcp2<\/artifactId>\r\n <version>2.1.1<\/version>\r\n <\/dependency>\r\n <dependency> \r\n <groupId>mysql<\/groupId> \r\n <artifactId>mysql-connector-java<\/artifactId> \r\n <version>6.0.5<\/version> \r\n <\/dependency>\r\n <\/dependencies>\r\n\r\n <build>\r\n <sourceDirectory>src\/main\/java<\/sourceDirectory>\r\n <plugins>\r\n <plugin>\r\n <artifactId>maven-compiler-plugin<\/artifactId>\r\n <version>3.5.1<\/version>\r\n <configuration>\r\n <source>1.8<\/source>\r\n <target>1.8<\/target>\r\n <\/configuration>\r\n <\/plugin>\r\n <\/plugins>\r\n <\/build>\r\n<\/project>\r\n<\/pre>\nJPA Entity class :<\/strong>\u00a0 This is entity class Person<\/strong>\u00a0consists of getter and setter methods.<\/p>\npackage com.innovationM.spring.entity;\r\n\r\nimport javax.persistence.Column;\r\nimport javax.persistence.GeneratedValue;\r\nimport javax.persistence.Entity;\r\nimport javax.persistence.Id;\r\nimport javax.persistence.GenerationType;\r\nimport javax.persistence.Table;\r\n\r\n@Entity\r\n@Table(name = \"PERSONS\")\r\npublic class Person {\r\n\r\n @Id\r\n @GeneratedValue(strategy = GenerationType.IDENTITY)\r\n private Long id;\r\n\r\n @Column(name = \"FIRST_NAME\")\r\n private String firstName;\r\n\r\n @Column(name = \"LAST_NAME\")\r\n private String lastName;\r\n\r\n @Column(name = \"EMAIL\")\r\n private String email;\r\n\r\n public Person() {}\r\n \r\n public Person(String firstName, String lastName, String email) {\r\n this.firstName = firstName;\r\n this.lastName = lastName;\r\n this.email = email;\r\n }\r\n\r\n \/\/getter and setter methods.\r\n}\r\n<\/pre>\nData Access Object (DAO) class :<\/h3>\n
PersonDao.java : <\/strong>This repository interface consists of methods to be implemented by implementation class.<\/p>\npackage com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonDao {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}<\/pre>\nPersonDaoImp.java :<\/strong> This repository class implements PersonDao<\/strong>\u00a0interface to provide method body accordingly as to persist data in database.<\/p>\npackage com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport javax.persistence.EntityManager;\r\nimport javax.persistence.PersistenceContext;\r\nimport javax.persistence.criteria.CriteriaQuery;\r\nimport javax.persistence.criteria.Root;\r\n\r\nimport org.springframework.stereotype.Repository;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Repository\r\npublic class PersonDaoImp implements PersonDao {\r\n\r\n @PersistenceContext\r\n private EntityManager em;\r\n\r\n @Override\r\n public void add(Person person) {\r\n em.persist(person);\r\n }\r\n\r\n @Override\r\n public List<Person> listPersons() {\r\n CriteriaQuery<Person> criteriaQuery = em.getCriteriaBuilder().createQuery(Person.class);\r\n @SuppressWarnings(\"unused\")\r\n Root<Person> root = criteriaQuery.from(Person.class);\r\n return em.createQuery(criteriaQuery).getResultList();\r\n }\r\n\r\n}\r\n<\/pre>\nService class :<\/h3>\n
PersonService.java : <\/strong>This interface consists of methods to be implemented by implementation class at service layer.<\/p>\npackage com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonService {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}\r\n<\/pre>\nPersonServiceImp.java : <\/strong>This service class implements PersonService<\/strong> interface to provide method body accordingly to our business logic.<\/p>\npackage com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.stereotype.Service;\r\nimport org.springframework.transaction.annotation.Transactional;\r\n\r\nimport com.innovationM.spring.dao.PersonDao;\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Service\r\npublic class PersonServiceImp implements PersonService {\r\n\r\n @Autowired\r\n private PersonDao userDao;\r\n\r\n @Transactional\r\n public void add(Person person) {\r\n userDao.add(person);\r\n }\r\n\r\n @Transactional(readOnly = true)\r\n public List<Person> listPersons() {\r\n return userDao.listPersons();\r\n }\r\n\r\n}\r\n<\/pre>\npersistence.xml file :<\/strong> This xml file contains information to connect with database.<\/p>\n<persistence xmlns=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\"\r\n xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\r\n http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\/persistence_2_1.xsd\"\r\n version=\"2.1\">\r\n\r\n <persistence-unit name=\"LOCAL_PERSISTENCE\">\r\n <description> Spring Hibernate JPA Configuration Example<\/description>\r\n <provider>org.hibernate.jpa.HibernatePersistenceProvider<\/provider>\r\n\r\n <properties>\r\n <property name=\"javax.persistence.jdbc.driver\" value=\"com.mysql.cj.jdbc.Driver\" \/>\r\n <property name=\"javax.persistence.jdbc.url\" value=\"jdbc:mysql:\/\/localhost:3306\/demo\" \/>\r\n <property name=\"javax.persistence.jdbc.user\" value=\"root\" \/>\r\n <property name=\"javax.persistence.jdbc.password\" value=\"root\" \/>\r\n <property name=\"hibernate.show_sql\" value=\"true\" \/>\r\n <property name=\"hibernate.hbm2ddl.auto\" value=\"update\" \/>\r\n <\/properties>\r\n\r\n <\/persistence-unit>\r\n<\/persistence><\/pre>\n
The Java Persistence API<\/strong> is used for managing, persisting and accessing data between objects and relation database. Hibernate is an ORM (Object Relational Mapping) tool which implements JPA specification.<\/p>\n Following program illustrates how to integrate Spring with JPA, using the Hibernate as a JPA provider :<\/p>\n pom.xml file :\u00a0<\/strong>Adding Spring, Hibernate and MySQL dependencies in maven project as follows:<\/p>\n JPA Entity class :<\/strong>\u00a0 This is entity class Person<\/strong>\u00a0consists of getter and setter methods.<\/p>\n PersonDao.java : <\/strong>This repository interface consists of methods to be implemented by implementation class.<\/p>\n PersonDaoImp.java :<\/strong> This repository class implements PersonDao<\/strong>\u00a0interface to provide method body accordingly as to persist data in database.<\/p>\n PersonService.java : <\/strong>This interface consists of methods to be implemented by implementation class at service layer.<\/p>\n PersonServiceImp.java : <\/strong>This service class implements PersonService<\/strong> interface to provide method body accordingly to our business logic.<\/p>\n persistence.xml file :<\/strong> This xml file contains information to connect with database.<\/p>\nExploring the Directory Structure :<\/h2>\n
<\/p>\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 \r\n http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\r\n <modelVersion>4.0.0<\/modelVersion>\r\n\r\n <groupId>com.innovationM.hibernate<\/groupId>\r\n <artifactId>spring-hibernate-jpa-example<\/artifactId>\r\n <version>0.0.1-SNAPSHOT<\/version>\r\n <packaging>jar<\/packaging>\r\n\r\n <name>spring-hibernate-jpa-tutorial<\/name>\r\n <url>http:\/\/maven.apache.org<\/url>\r\n\r\n <properties>\r\n <project.build.sourceEncoding>UTF-8<\/project.build.sourceEncoding>\r\n <\/properties>\r\n\r\n <dependencies>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-context<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.springframework<\/groupId>\r\n <artifactId>spring-orm<\/artifactId>\r\n <version>4.3.7.RELEASE<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.hibernate<\/groupId>\r\n <artifactId>hibernate-core<\/artifactId>\r\n <version>5.2.9.Final<\/version>\r\n <\/dependency>\r\n <dependency>\r\n <groupId>org.apache.commons<\/groupId>\r\n <artifactId>commons-dbcp2<\/artifactId>\r\n <version>2.1.1<\/version>\r\n <\/dependency>\r\n <dependency> \r\n <groupId>mysql<\/groupId> \r\n <artifactId>mysql-connector-java<\/artifactId> \r\n <version>6.0.5<\/version> \r\n <\/dependency>\r\n <\/dependencies>\r\n\r\n <build>\r\n <sourceDirectory>src\/main\/java<\/sourceDirectory>\r\n <plugins>\r\n <plugin>\r\n <artifactId>maven-compiler-plugin<\/artifactId>\r\n <version>3.5.1<\/version>\r\n <configuration>\r\n <source>1.8<\/source>\r\n <target>1.8<\/target>\r\n <\/configuration>\r\n <\/plugin>\r\n <\/plugins>\r\n <\/build>\r\n<\/project>\r\n<\/pre>\n
package com.innovationM.spring.entity;\r\n\r\nimport javax.persistence.Column;\r\nimport javax.persistence.GeneratedValue;\r\nimport javax.persistence.Entity;\r\nimport javax.persistence.Id;\r\nimport javax.persistence.GenerationType;\r\nimport javax.persistence.Table;\r\n\r\n@Entity\r\n@Table(name = \"PERSONS\")\r\npublic class Person {\r\n\r\n @Id\r\n @GeneratedValue(strategy = GenerationType.IDENTITY)\r\n private Long id;\r\n\r\n @Column(name = \"FIRST_NAME\")\r\n private String firstName;\r\n\r\n @Column(name = \"LAST_NAME\")\r\n private String lastName;\r\n\r\n @Column(name = \"EMAIL\")\r\n private String email;\r\n\r\n public Person() {}\r\n \r\n public Person(String firstName, String lastName, String email) {\r\n this.firstName = firstName;\r\n this.lastName = lastName;\r\n this.email = email;\r\n }\r\n\r\n \/\/getter and setter methods.\r\n}\r\n<\/pre>\nData Access Object (DAO) class :<\/h3>\n
package com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonDao {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}<\/pre>\npackage com.innovationM.spring.dao;\r\n\r\nimport java.util.List;\r\n\r\nimport javax.persistence.EntityManager;\r\nimport javax.persistence.PersistenceContext;\r\nimport javax.persistence.criteria.CriteriaQuery;\r\nimport javax.persistence.criteria.Root;\r\n\r\nimport org.springframework.stereotype.Repository;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Repository\r\npublic class PersonDaoImp implements PersonDao {\r\n\r\n @PersistenceContext\r\n private EntityManager em;\r\n\r\n @Override\r\n public void add(Person person) {\r\n em.persist(person);\r\n }\r\n\r\n @Override\r\n public List<Person> listPersons() {\r\n CriteriaQuery<Person> criteriaQuery = em.getCriteriaBuilder().createQuery(Person.class);\r\n @SuppressWarnings(\"unused\")\r\n Root<Person> root = criteriaQuery.from(Person.class);\r\n return em.createQuery(criteriaQuery).getResultList();\r\n }\r\n\r\n}\r\n<\/pre>\nService class :<\/h3>\n
package com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport com.innovationM.spring.entity.Person;\r\n\r\npublic interface PersonService {\r\n void add(Person person);\r\n List<Person> listPersons();\r\n}\r\n<\/pre>\npackage com.innovationM.spring.service;\r\n\r\nimport java.util.List;\r\n\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.stereotype.Service;\r\nimport org.springframework.transaction.annotation.Transactional;\r\n\r\nimport com.innovationM.spring.dao.PersonDao;\r\nimport com.innovationM.spring.entity.Person;\r\n\r\n@Service\r\npublic class PersonServiceImp implements PersonService {\r\n\r\n @Autowired\r\n private PersonDao userDao;\r\n\r\n @Transactional\r\n public void add(Person person) {\r\n userDao.add(person);\r\n }\r\n\r\n @Transactional(readOnly = true)\r\n public List<Person> listPersons() {\r\n return userDao.listPersons();\r\n }\r\n\r\n}\r\n<\/pre>\n<persistence xmlns=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\"\r\n xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n xsi:schemaLocation=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\r\n http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\/persistence_2_1.xsd\"\r\n version=\"2.1\">\r\n\r\n <persistence-unit name=\"LOCAL_PERSISTENCE\">\r\n <description> Spring Hibernate JPA Configuration Example<\/description>\r\n <provider>org.hibernate.jpa.HibernatePersistenceProvider<\/provider>\r\n\r\n <properties>\r\n <property name=\"javax.persistence.jdbc.driver\" value=\"com.mysql.cj.jdbc.Driver\" \/>\r\n <property name=\"javax.persistence.jdbc.url\" value=\"jdbc:mysql:\/\/localhost:3306\/demo\" \/>\r\n <property name=\"javax.persistence.jdbc.user\" value=\"root\" \/>\r\n <property name=\"javax.persistence.jdbc.password\" value=\"root\" \/>\r\n <property name=\"hibernate.show_sql\" value=\"true\" \/>\r\n <property name=\"hibernate.hbm2ddl.auto\" value=\"update\" \/>\r\n <\/properties>\r\n\r\n <\/persistence-unit>\r\n<\/persistence><\/pre>\n