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SpringData【Spring整合Hibernate】

Spring整合Hibernate


1.创建maven项目
通过IDEA或者Eclipse创建一个简单的maven工程(jar)即可

2.添加相关的依赖
在pom文件中添加如下依赖

<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.21.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.8.RELEASE</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.3</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.0.7.Final</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.3.21.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.32</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.21.RELEASE</version>
</dependency>
</dependencies>

3.添加对应的配置文件
在resources目录下创建spring的配置文件和数据库连接的属性文件,如下:

jdbc.properties文件中的内容:

jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
jdbc.driver.class=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=123456

applicationContext.xml内容:

<?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>

<!– 配置Hibernate的SeesionFactory –>
<bean id=”sessionFactory” class=”org.springframework.orm.hibernate5.LocalSessionFactoryBean”>
<property name=”dataSource” ref=”dataSource”/>
<!– hibernateProperties属性:配置与hibernate相关的内容,如显示sql语句,开启正向工程 –>
<property name=”hibernateProperties”>
<props>
<!– 显示当前执行的sql语句 –>
<prop key=”hibernate.show_sql”>true</prop>
<!– 开启正向工程 –>
<prop key=”hibernate.hbm2ddl.auto”>update</prop>
</props>
</property>
<!– 扫描实体所在的包 –>
<property name=”packagesToScan”>
<list>
<value>com.dpb.pojo</value>
</list>
</property>
</bean>

<!– 配置HiberanteTemplate对象 –>
<bean id=”hibernateTemplate” class=”org.springframework.orm.hibernate5.HibernateTemplate”>
<property name=”sessionFactory” ref=”sessionFactory”/>
</bean>
<!– 配置Hibernate的事务管理器 –>
<bean id=”transactionManager” class=”org.springframework.orm.hibernate5.HibernateTransactionManager”>
<property name=”sessionFactory” ref=”sessionFactory”/>
</bean>

<!– 配置开启注解事务处理 –>
<tx:annotation-driven transaction-manager=”transactionManager”/>

<!– 配置springIOC的注解扫描 –>
<context:component-scan base-package=”com.dpb”/>
</beans>

4.创建pojo
数据的表结构请自行创建一张简单的users表即可,就三个简单的字段(userid,username,userage),pojo如下:

/**
* @program: spring-hibernate
* @description: Users的Pojo对象
* @author: 波波烤鸭
* @create: 2019-05-18 09:37
*/

@Entity
@Table(name=”users”)
public class Users implements Serializable {

@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)//strategy=GenerationType.IDENTITY 自增长
@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 + “]”;
}

}

5.创建持久层的接口和实现
创建持久层的Dao接口和实现类,具体如下:

/**
* 定义接口中的方法
*/
public interface UserDao {

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);
}

实现类—-注意导入的jar包

import com.dpb.dao.UserDao;
import com.dpb.pojo.Users;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate5.HibernateTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
* @program: spring-hibernate
* @description: 用户持久层的实现类
* @author: 波波烤鸭
* @create: 2019-05-18 09:43
*/
@Repository
public class UserDaoImpl implements UserDao {

@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);
}

/**
* HQL 使用
* @param username
* @return
*/
@Override
public List<Users> selectUserByName(String username) {
//getCurrentSession:当前session必须要有事务边界,且只能处理唯一的一个事务。当事务提交或者回滚后session自动失效
//openSession:每次都会打开一个新的session.加入每次使用多次。则获得的是不同session对象。使用完毕后我们需要手动的调用colse方法关闭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();
}

/**
* SQL 的使用
* @param username
* @return
*/
@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();
}

/**
* Criteria
* @param username
* @return
*/
@Override
public List<Users> selectUserByNameUseCriteria(String username) {
Session session = this.hibernateTemplate.getSessionFactory().getCurrentSession();
//sql:select * from t_users where username = 张三
Criteria c = session.createCriteria(Users.class);
c.add(Restrictions.eq(“username”, username));
return c.list();
}
}

6.单元测试
在test目录下创建单元测试类,测试相关的操作

/**
* @program: spring-hibernate
* @description: 单元测试
* @author: 波波烤鸭
* @create: 2019-05-18 09:48
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(“classpath:applicationContext.xml”)
public class TestDemo {

@Autowired
private UserDao usersDao;

/**
* 添加用户
*/
@Test
@Transactional// 在测试类对于事务提交方式默认的是回滚。
@Rollback(false)//取消自动回滚
public void testInsertUsers(){
Users users = new Users();
users.setUserage(20);
users.setUsername(“张三”);
this.usersDao.insertUsers(users);
}

/**
* 更新用户
*/
@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);
}

/**
* 根据userid查询用户
*/
@Test
public void testSelectUsersById(){
Users users = this.usersDao.selectUsersById(2);
System.out.println(users);
}

/**
* 删除用户
*/
@Test
@Transactional
@Rollback(false)
public void testDeleteUsers(){
Users users = new Users();
users.setUserid(2);
this.usersDao.deleteUsers(users);
}

/**
* HQL测试
*/
@Test
@Transactional
public void testSelectUserByName(){
List<Users> list = this.usersDao.selectUserByName(“张三”);
for (Users users : list) {
System.out.println(users);
}
}

/**
* SQL测试
*/
@Test
@Transactional
public void testSelectUserByNameUseSQL(){
List<Users> list = this.usersDao.selectUserByNameUseSQL(“张三”);
for (Users users : list) {
System.out.println(users);
}
}

/**
* Criteria测试
*/
@Test
@Transactional
public void testSelectUserByNameUseCriteria(){
List<Users> list = this.usersDao.selectUserByNameUseCriteria(“张三”);
for (Users users : list) {
System.out.println(users);
}
}
}

———————
作者:波波烤鸭
来源:CSDN
原文:https://blog.csdn.net/qq_38526573/article/details/90312221
版权声明:本文为博主原创文章,转载请附上博文链接!

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