Spring整合Hibernate

一：Spring整合Hibernate

1：創建項目，導入jar包

https://download.csdn.net/download/qq_36297434/11890694

2：配置文件

2.1：jdbc.properties

jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.driver.class=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=xxxx

2.2：applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context.xsd
	http://www.springframework.org/schema/aop
	http://www.springframework.org/schema/aop/spring-aop.xsd
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx.xsd">
	
	<!-- 配置讀取properties文件的工具類 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 配置c3p0數據庫連接池 -->
	<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>
	
	<!-- 配置Hibernate的SeesionFactory -->
	<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<!-- hibernateProperties屬性：配置與hibernate相關的內容，如顯示sql語句，開啓正向工程 -->
		<property name="hibernateProperties">
			<props>
				<!-- 顯示當前執行的sql語句 -->
				<prop key="hibernate.show_sql">true</prop>
				<!-- 開啓正向工程 -->
				<prop key="hibernate.hbm2ddl.auto">update</prop>
			</props>
		</property>
		<!-- 掃描實體所在的包 -->
		<property name="packagesToScan">
			<list>
				<value>hhxy.pojo</value>
			</list>
		</property>
	</bean>

	<!-- 配置Hibernate的事務管理器 -->
	<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"/>
	</bean>
	
	<!-- 配置開啓註解事務處理 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>
	
	<!-- 配置springIOC的註解掃描 -->
	<context:component-scan base-package="hhxy"/>
</beans>

3：通過 Hibernate完成CRUD操作

3.1：創建數據庫

CREATE DATABASE test CHARACTER SET utf8 COLLATE utf8_general_ci;

3.2：編寫實體類

@Entity
@Table(name="t_users")
public class Users implements Serializable{
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)//strategy=GenerationType.IDENTITY 自增長
    @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;
    }
}

3.3：編寫 UsersDao接口與接口實現類

3.3.1：修改配置文件，添加 HibernateTemplate 

<!-- 配置HiberanteTemplate對象 -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate5.HibernateTemplate">
    <property name="sessionFactory" ref="sessionFactory"/>
</bean>

3.3.2：編寫接口和實現類

public interface UsersDao {
	
	void insertUsers(Users users);
	void updateUsers(Users users);
	void deleteUsers(Users users);
	Users selectUsersById(Integer userid);
}

@Repository
public class UsersDaoImpl implements UsersDao {
    @Autowired
    private HibernateTemplate hibernateTemplate;
    @Override
    public void insertUsers(Users users) {
        this.hibernateTemplate.save(users);
    }
    @Override
    public void updateUsers(Users users) {
        this.hibernateTemplate.update(users);
    }
    @Override
    public void deleteUsers(Users users) {
        this.hibernateTemplate.delete(users);
    }
    @Override
    public Users selectUsersById(Integer userid) {
        return this.hibernateTemplate.get(Users.class, userid);
    }
}

3.3.3：編寫測試代碼

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class UsersDaoImplTest {
    @Autowired
    private UsersDao usersDao;
    /**
    * 添加用戶
    */
    @Test
    @Transactional// 在測試類對於事務提交方式默認的是回滾。
    @Rollback(false)//取消自動回滾
    public void testInsertUsers(){
        Users users = new Users();
        users.setUserage(20);
        users.setUsername("張三");
        this.usersDao.insertUsers(users);
    }
    /**
    * 更新用戶
    */
    @Test
    @Transactional
    @Rollback(false)
    public void testUpdateUsers(){
        Users users = new Users();
        users.setUserid(2);
        users.setUserage(22);
        users.setUsername("李四");
        this.usersDao.updateUsers(users);
    }
    /**
    * 根據 userid 查詢用戶
    */
    @Test
    public void testSelectUsersById(){
        Users users = this.usersDao.selectUsersById(2);
        System.out.println(users);
    }
    /**
    * 刪除用戶
    */
    @Test
    @Transactional
    @Rollback(false)
    public void testDeleteUsers(){
        Users users = new Users();
        users.setUserid(2);
        this.usersDao.deleteUsers(users);
    }
}

4：HQL查詢

HQL（Hibernate Query Language）：就是將原來的 sql 語句中的表與字段名稱換成對象與屬性的名稱就可以了

4.1：添加查詢方法

@Override
public List<Users> selectUserByName(String username) {
    //getCurrentSession:當前 session 必須要有事務邊界，且只能處理唯一的一個事務。當事務提交或者回滾後 session 自動失效
    //openSession:每次都會打開一個新的 session.加入每次使用多次。則獲得的是不同 session 對象。使用完畢後我們需要手動的調用 colse 方法關閉 session
    Session session =this.hibernateTemplate.getSessionFactory().getCurrentSession();
    //sql:select * from t_users where username =
    Query query = session.createQuery("from Users where username = :abc");
    Query queryTemp = query.setString("abc",username);
    return queryTemp.list();
}

4.2：測試代碼

/**
* HQL 測試
*/
@Test
@Transactional
public void testSelectUserByName(){
    List<Users> list = this.usersDao.selectUserByName("張三");
    for (Users users : list) {
        System.out.println(users);
    }
}

5：SQL查詢

5.1：添加查詢方法

@Override
public List<Users> selectUserByNameUseSQL(String username) {
    Session session =this.hibernateTemplate.getSessionFactory().getCurrentSession();
    Query query = session.createSQLQuery("select * from t_users where username = ?").addEntity(Users.class).setString(0, username);
    return query.list();
}

5.2：測試代碼

/**
* SQL 測試
*/
@Test
@Transactional
public void testSelectUserByNameUseSQL(){
    List<Users> list = this.usersDao.selectUserByNameUseSQL("張三");
    for (Users users : list) {
        System.out.println(users);
    }
}

6：QBC查詢（Query By Criteria）

6.1：添加查詢方法

@Override
public List<Users> selectUserByNameUseCriteria(String username) {
    Session session =this.hibernateTemplate.getSessionFactory().getCurrentSession();
    //sql:select * from t_users where username = 張三
    Criteria c = session.createCriteria(Users.class);
    c.add(Restrictions.eq("username", username));
    return c.list();
}

6.2：測試代碼

/**
* Criteria 測試
*/
@Test
@Transactional
public void testSelectUserByNameUseCriteria(){
    List<Users> list = this.usersDao.selectUserByNameUseCriteria("張三");
    for (Users users : list) {
        System.out.println(users);
    }
}

二： Spring整合Hibernate JPA

1：Spring整合 Hibernate JPA

1.1：創建項目，導入jar

https://download.csdn.net/download/qq_36297434/11890694

1.2：修改配置文件

1.2.1：jdbc.properties

jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.driver.class=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=xxxx

1.2.2：applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context.xsd
	http://www.springframework.org/schema/aop
	http://www.springframework.org/schema/aop/spring-aop.xsd
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx.xsd">
	
	<!-- 配置讀取properties文件的工具類 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 配置c3p0數據庫連接池 -->
	<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JPA  配置EntityManagerFactory-->
	<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="jpaVedorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<!-- hibernate相關的屬性的注入 -->
				<!-- 配置數據庫類型 -->
				<property name="database" value="MYSQL"/>
				<!-- 正向工程 自動創建表 -->
				<property name="generateDdl" value="true"/>
				<!-- 顯示執行的SQL -->
				<property name="showSql" value="true"/>
			</bean>
		</property>
		<!-- 掃描實體的包 -->
		<property name="packagesToScan">
			<list>
				<value>hhxy.pojo</value>
			</list>
		</property>
	</bean>

	<!-- 配置Hibernate的事務管理器 -->
	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory"/>
	</bean>
	
	<!-- 配置開啓註解事務處理 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>
	
	<!-- 配置springIOC的註解掃描 -->
	<context:component-scan base-package="hhxy"/>
</beans>

2：Hibernate JPA的CRUD  

2.1：接口和實現類

public interface UsersDao {
	void insertUsers(Users users);
	void updateUsers(Users users);
	void deleteUsers(Users users);
	Users selectUsersById(Integer userid);
	List<Users> selectUserByName(String username);
	List<Users> selectUserByNameUseSQL(String username);
	List<Users> selectUserByNameUseCriteria(String username);
}

@Repository
public class UsersDaoImpl  implements UsersDao {
	@PersistenceContext(name="entityManagerFactory")
	private EntityManager entityManager;
	@Override
	public void insertUsers(Users users) {
		this.entityManager.persist(users);
	}
	@Override
	public void updateUsers(Users users) {
		this.entityManager.merge(users);
	}
	@Override
	public void deleteUsers(Users users) {
		Users  u = this.selectUsersById(users.getUserid());
		this.entityManager.remove(u);
	}
	@Override
	public Users selectUsersById(Integer userid) {
		return this.entityManager.find(Users.class, userid);
	}
	@Override
	public List<Users> selectUserByName(String username) {
		return null;
	}
	@Override
	public List<Users> selectUserByNameUseSQL(String username) {
		return null;
	}
	@Override
	public List<Users> selectUserByNameUseCriteria(String username) {
		return null;
	}
}

3：Hibernate JPA中的HQL語句

@Override
public List<Users> selectUserByName(String username) {
    return this.entityManager.createQuery(" from Users where username = :abc").setParameter("abc", username).getResultList();
}

4：Hibernate JPA中的SQL 

@Override
public List<Users> selectUserByNameUseSQL(String username) {
    //在 Hibernate JPA 中 如果通過？方式來佔位，那麼他的查數是從1開始的。而 hibernate 中是從 0 開始的。
    return this.entityManager.createNativeQuery("select * from t_users where username = ?", Users.class).setParameter(1,username).getResultList();
}

5：HibernateJPA中QBC查詢

@Override
public List<Users> selectUserByNameUseCriteria(String username) {
    //CriteriaBuilder 對象：創建一個 CriteriaQuery,創建查詢條件。
    CriteriaBuilder builber = this.entityManager.getCriteriaBuilder();
    //CriteriaQuery 對象：執行查詢的 Criteria 對象
    //select * from t_users CriteriaQuery<Users> query = builber.createQuery(Users.class);
    //獲取要查詢的實體類的對象
    Root<Users> root = query.from(Users.class);
    //封裝查詢條件
    Predicate cate = builber.equal(root.get("username"), username);
    //select * from t_users where username = 張三
    query.where(cate);
    //執行查詢
    TypedQuery<Users> typeQuery = this.entityManager.createQuery(query);
    return typeQuery.getResultList();
}