JPA:就是由Sun公司提供的一套对于持久层操作的标准(接口加文档),没有具体的实现。
Hibernate：是Gavin King 开发的一套对于持久层操作的自动ORM框架。
Hibernate JPA：是在Hibernate3.2版本中，提供的对于JPA标准的实现。提供了一套按照JPA标准来实现持久层开发的APi。
下面具体的代码实现：
1.导入Maven依赖：
<dependencies> <!--Spring Ioc相关依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>5.3.18</version> </dependency> <!--Spring Aop的相关依赖--> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.8.RC2</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>5.3.18</version> </dependency> <!--Spring jdbc的相关依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.3.18</version> </dependency> <!--spring orm的相关依赖--> <!-- https://mvnrepository.com/artifact/org.springframework/spring-orm --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>5.3.18</version> </dependency> <!--单元测试用的依赖--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.3.18</version> </dependency> <!--日志依赖--> <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging --> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.2</version> </dependency> <!--Hibernate的核心依赖,9个必须要导入--> <!-- https://mvnrepository.com/artifact/antlr/antlr --> <dependency> <groupId>antlr</groupId> <artifactId>antlr</artifactId> <version>2.7.7</version> </dependency> <!-- https://mvnrepository.com/artifact/org.dom4j/dom4j --> <dependency> <groupId>org.dom4j</groupId> <artifactId>dom4j</artifactId> <version>2.1.3</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.geronimo.specs/geronimo-jta_1.1_spec --> <dependency> <groupId>org.apache.geronimo.specs</groupId> <artifactId>geronimo-jta_1.1_spec</artifactId> <version>1.1.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate.common/hibernate-commons-annotations --> <dependency> <groupId>org.hibernate.common</groupId> <artifactId>hibernate-commons-annotations</artifactId> <version>5.1.2.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>5.6.5.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate.javax.persistence/hibernate-jpa-2.1-api --> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.1-api</artifactId> <version>1.0.0.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/org.jboss/jandex --> <dependency> <groupId>org.jboss</groupId> <artifactId>jandex</artifactId> <version>2.0.0.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/org.javassist/javassist --> <dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.28.0-GA</version> </dependency> <!-- https://mvnrepository.com/artifact/org.jboss.logging/jboss-logging --> <dependency> <groupId>org.jboss.logging</groupId> <artifactId>jboss-logging</artifactId> <version>3.4.1.Final</version> </dependency> <!--mysql数据驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> <!--连接池相关的依赖--> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.5</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0 --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-c3p0</artifactId> <version>5.6.7.Final</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>mchange-commons-java</artifactId> <version>0.2.19</version> </dependency> <!--hibernate jpa 相关依赖--> <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>5.6.7.Final</version> </dependency> </dependencies>
创建applicationContext.xml配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd"> <!--配置读取properties文件的工具类--> <context:property-placeholder location="classpath:jdbc.properties"/> <!--配置c3p0数据库连接池--> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="driverClass" value="${jdbc.driver.class}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!--Spring整合 Hibernate JPA ,配置EntityManagerFactory--> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <!--hibernate相关属性的注入:--> <!--database配置数据库类型--> <property name="database" value="MYSQL"/> <!--开启正向工程，自动创建表--> <property name="generateDdl" value="true"/> <!--开启显示执行的sql--> <property name="showSql" value="true"/> </bean> </property> <!--配置要扫描的实体的包--> <property name="packagesToScan"> <list> <value>com.haiexijun.pojo</value> </list> </property> </bean> <!--配置Hibernate的事务管理器--> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <!--开启注解事务处理--> <tx:annotation-driven transaction-manager="transactionManager"/> <!--配置springIOC的注解扫描--> <context:component-scan base-package="com.haiexijun"/> </beans>
创建数据库hibernate02
jdbc配置文件：
jdbc.url=jdbc:mysql://localhost:3306/hibernate02 jdbc.driver.class=com.mysql.cj.jdbc.Driver jdbc.username=root jdbc.password=zc20020106
2.编写实体类
package com.haiexijun.pojo; import javax.persistence.*; import java.io.Serializable; @Entity @Table(name = "t_users") public class Users implements Serializable { @Id @GeneratedValue(strategy = GenerationType.IDENTITY)//自增 @Column(name = "userid") private Integer userId; @Column(name = "username") private String userName; @Column(name = "userage") private Integer userAge; public Integer getUserId() { return userId; } public void setUserId(Integer userId) { this.userId = userId; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public Integer getUserAge() { return userAge; } public void setUserAge(Integer userAge) { this.userAge = userAge; } @Override public String toString() { return "Users{" + "userId=" + userId + ", userName='" + userName + '\'' + ", userAge=" + userAge + '}'; } }
3.创建usersDao类及其实现类
package com.haiexijun.dao.impl; import com.haiexijun.dao.usersDao; import com.haiexijun.pojo.Users; import org.springframework.stereotype.Repository; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.TypedQuery; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.CriteriaQuery; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root; import java.util.List; @Repository public class usersDaoImpl implements usersDao { @PersistenceContext(name = "entityManagerFactory") private EntityManager entityManager; @Override public void insertUsers(Users users) { entityManager.persist(users); } @Override public void updateUsers(Users users) { entityManager.merge(users); } @Override public void deleteUsers(Users users) { Users u =selectUsersById(users.getUserId()); this.entityManager.remove(u); } @Override public Users selectUsersById(Integer userid) { return entityManager.find(Users.class,userid); } @Override public List<Users> selectUserByAge(Integer age) { //这里from会报错，但是没有毛病！ return entityManager.createQuery("from Users where userAge = :abc").setParameter("abc",age).getResultList(); } @Override public List<Users> selectUserByAgeUseSQL(Integer age) { //这里要绝对注意哦，在Hibernate JPA中如果通过?还传入参数，查数是从1开始的。我们之前学习的Hibernate是从0开始的。 return entityManager.createNativeQuery("select * from t_users where userage=?",Users.class).setParameter(1,age).getResultList(); } @Override public List<Users> selectUserByAgeUseQBC(Integer age) { //CriteriaBuilder对象：创建一个CriteriaQuery,创建查询条件 CriteriaBuilder builder=entityManager.getCriteriaBuilder(); //CriteriaQuery对象：执行查询的Criteria对象 CriteriaQuery<Users> query=builder.createQuery(Users.class); //获取要查询的实体类对象 Root<Users> root=query.from(Users.class); //封装查询条件 Predicate predicate=builder.equal(root.get("userAge"),age); query.where(predicate); //执行查询 TypedQuery<Users> typedQuery=entityManager.createQuery(query); List<Users> users=typedQuery.getResultList(); return users; } }
测试代码：
package com.haiexijun.dao.impl; import com.haiexijun.pojo.Users; import junit.framework.TestCase; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.annotation.Rollback; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import org.springframework.transaction.annotation.Transactional; import java.util.List; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class usersDaoImplTest extends TestCase { @Autowired private usersDaoImpl usersDao; @Test @Transactional @Rollback(value = false) public void testInsertUsers() { Users users=new Users(); users.setUserName("张五"); users.setUserAge(20); usersDao.insertUsers(users); } @Test @Transactional @Rollback(value = false) public void testUpdateUsers() { Users users=new Users(); users.setUserId(1); users.setUserName("张四"); users.setUserAge(20); usersDao.updateUsers(users); } @Test @Transactional @Rollback(value = false) public void testDeleteUsers() { Users users=new Users(); users.setUserId(1); users.setUserName("张四"); users.setUserAge(20); usersDao.deleteUsers(users); } @Test @Transactional @Rollback(value = false) public void testSelectUsersById() { Users users= usersDao.selectUsersById(1); System.out.println(users); } @Test @Transactional @Rollback(value = false) public void testSelectUserByAge() { List<Users> usersList = usersDao.selectUserByAge(20); System.out.println(usersList); } @Test @Transactional @Rollback(value = false) public void testSelectUserByAgeUseSQL() { System.out.println(usersDao.selectUserByAgeUseSQL(20)); } @Test @Transactional @Rollback(value = false) public void testSelectUserByAgeUseQBC() { System.out.println(usersDao.selectUserByAgeUseQBC(20)); } }
