Detailed code explanation of Spring and Hibernate for Java transaction management learning

This article mainly introduces you to the relevant information of Spring and Hibernate for learning Java transaction management. The article introduces it in detail through sample code. Friends who need it can refer to it. Let's take a look together.

Environment and version

The related lib of hibernate in an article before this article came out

Java Transaction Management Hibernate

You also need to add the spring lib package and the following dependency packages

org.aopalliance

org.aspectj

org.apache.commons

The version of Spring is Spring 4.1.5.

Dependency packages can also be downloaded from the Spring official website, with names similar to spring-framework-3.0.2.RELEASE-dependencies

Theoretical knowledge

After the integration of Spring and Hibernate, when performing database operations through Hibernate API, I found that opensession, close, beginTransaction, and commit are required every time. These are repetitive tasks, and we can leave the transaction management part to the spring framework.

After using spring to manage transactions, you no longer need to call beginTransaction and commit in dao, nor do you need to call session.close(), use API sessionFactory.getCurrentSession()To replace sessionFactory.openSession()

* If you are using a local transaction (jdbc transaction)

<property name="hibernate.current_session_context_class">thread</property>

* If you are using a global transaction (jta Transaction)

<property name="hibernate.current_session_context_class">jta</property>

Detailed explanation of the transaction attributes of the Propagation class in Spring:

PROPAGATION_REQUIRED: Supports the current transaction. If there is no transaction currently, create a new one affairs. This is the most common choice.

PROPAGATION_SUPPORTS: Supports the current transaction. If there is no transaction currently, it will be executed in a non-transactional manner.

PROPAGATION_MANDATORY: Supports the current transaction. If there is no current transaction, an exception will be thrown.

PROPAGATION_REQUIRES_NEW: Create a new transaction. If a transaction currently exists, suspend the current transaction.

PROPAGATION_NOT_SUPPORTED: Perform operations in a non-transactional manner. If a transaction currently exists, suspend the current transaction.

PROPAGATION_NEVER: Executed in a non-transactional manner, if a transaction currently exists, an exception will be thrown.

PROPAGATION_NESTED: Supports the current transaction. If the current transaction exists, a nested transaction will be executed. If there is no current transaction, a new transaction will be created.

Spring can use xml for configuration or annotation declaration for transaction management.

xml mode configuration transaction code example

##The code structure is as follows:

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:p="http://www.springframework.org/schema/p" 
 xmlns:context="http://www.springframework.org/schema/context" 
 xmlns:util="http://www.springframework.org/schema/util" xmlns:mvc="http://www.springframework.org/schema/mvc" 
 xmlns:tx="http://www.springframework.org/schema/tx" 
 xmlns:aop="http://www.springframework.org/schema/aop" 
 xsi:schemaLocation=" 
  http://www.springframework.org/schema/util 
  http://www.springframework.org/schema/util/spring-util-3.1.xsd 
  http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
  http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-3.1.xsd 
  http://www.springframework.org/schema/mvc 
  http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
  http://www.springframework.org/schema/tx 
  http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
  http://www.springframework.org/schema/aop 
  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> 
 
 <context:component-scan base-package="com.oscar999.trans.sprhib" /> 
 <context:property-placeholder location="classpath:/com/oscar999/trans/sprhib/config.properties" /> 
 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
  destroy-method="close"> 
  <!-- Connection Info --> 
  <property name="driverClassName" value="${jdbc.driver}" /> 
  <property name="url" value="${jdbc.url}" /> 
  <property name="username" value="${jdbc.username}" /> 
  <property name="password" value="${jdbc.password}"></property> 
 </bean> 
 
 <bean id="sessionFactory" 
  class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
  <property name="dataSource" ref="dataSource"></property> 
  <property name="hibernateProperties"> 
   <props> 
    <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop> 
    <prop key="hibernate.hbm2ddl.auto">update</prop> 
    <prop key="hibernate.show_sql">true</prop> 
    <prop key="hibernate.format_sql">true</prop> 
    <prop key="hibernate.jdbc.batch_size">20</prop> 
    <prop key="hibernate.enable_lazy_load_no_trans">true</prop> 
    <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop> 
    <prop key="jdbc.use_streams_for_binary">true</prop> 
   </props> 
  </property> 
  <property name="packagesToScan"> 
   <list> 
    <value>com.oscar999.trans.sprhib.model</value> 
   </list> 
  </property> 
 </bean> 
 
 <!-- Transaction --> 
 <bean id="transactionManager" 
  class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
  <property name="sessionFactory" ref="sessionFactory" /> 
 </bean> 
 <tx:advice id="txAdvice" transaction-manager="transactionManager"> 
  <tx:attributes> 
   <tx:method name="save*" propagation="REQUIRED" /> 
   <tx:method name="*" read-only="true" /> 
  </tx:attributes> 
 </tx:advice> 
 <aop:config proxy-target-class="true"> 
  <aop:pointcut expression="execution(* com.oscar999.trans.sprhib.dao.ProductDAOImpl.*(..))" id="pointcut" /> 
  <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut" /> 
 </aop:config> 
 
</beans>

config.properties

jdbc.driver=oracle.jdbc.driver.OracleDriver 
jdbc.url=jdbc:oracle:thin:@12.6.18.43:1521:orcl 
jdbc.username= 
jdbc.password=oracle

Product.Java

/** 
 * @Title: Product.java 
 * @Package com.oscar999.trans.hibernate 
 * @Description: 
 * @author XM 
 * @date Feb 15, 2017 1:44:47 PM 
 * @version V1.0 
 */ 
package com.oscar999.trans.sprhib.model; 
 
import java.io.Serializable; 
 
import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.Id; 
import javax.persistence.Table; 
 
/** 
 * @author XM 
 * 
 */ 
@Entity 
@Table(name = "TEST_PRODUCT") 
public class Product implements Serializable { 
 
 public Product() { 
 } 
 
 @Id 
 @Column(name = "ID") 
 private Integer id; 
 
 @Column(name = "NAME") 
 private String name; 
 
 @Column(name = "PRICE") 
 private String price; 
 
 private static final long serialVersionUID = 1L; 
 
 public Integer getId() { 
  return id; 
 } 
 
 public void setId(Integer id) { 
  this.id = id; 
 } 
 
 public String getName() { 
  return name; 
 } 
 
 public void setName(String name) { 
  this.name = name; 
 } 
 
 public String getPrice() { 
  return price; 
 } 
 
 public void setPrice(String price) { 
  this.price = price; 
 } 
 
}

ProductDAOImpl.java

/** 
 * @Title: ProductDAOImpl.java 
 * @Package com.oscar999.trans.sprhib 
 * @Description: 
 * @author XM 
 * @date Feb 15, 2017 4:15:09 PM 
 * @version V1.0 
 */ 
package com.oscar999.trans.sprhib.dao; 
 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Repository; 
 
import com.oscar999.trans.sprhib.model.Product; 
 
/** 
 * @author XM 
 * 
 */ 
@Repository 
public class ProductDAOImpl { 
 
 @Autowired 
 private SessionFactory sessionFactory; 
 
 public Product findProductById(int id) { 
  Session session = sessionFactory.getCurrentSession(); 
  Product product = (Product) session.get(Product.class, id); 
  return product; 
 } 
  
 public Product saveProduct(Product product) { 
  Session session = sessionFactory.getCurrentSession(); 
  session.save(product); 
  return product; 
 } 
}

ProductServiceImpl.java

package com.oscar999.trans.sprhib; 
 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Service; 
 
import com.oscar999.trans.sprhib.dao.ProductDAOImpl; 
import com.oscar999.trans.sprhib.model.Product; 
 
@Service 
public class ProductServiceImpl { 
 
 @Autowired 
 private ProductDAOImpl productdao; 
 
 public void findProduct(int id) { 
  Product product = productdao.findProductById(id); 
  if (product != null) { 
   System.out.println(product.getName()); 
  } 
 } 
 
 public void saveProduct() { 
  Product product = new Product(); 
  product.setId(2); 
  product.setName("product2"); 
  product.setPrice("price2"); 
  productdao.saveProduct(product); 
 
 } 
}

TestMain.java

/** 
 * @Title: TestMain.java 
 * @Package com.oscar999.trans.sprhib 
 * @Description: 
 * @author XM 
 * @date Feb 15, 2017 3:54:54 PM 
 * @version V1.0 
 */ 
package com.oscar999.trans.sprhib; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
/** 
 * @author XM 
 * 
 */ 
public class TestMain { 
 
 /** 
  * @param args 
  */ 
 public static void main(String[] args) { 
  // TODO Auto-generated method stub 
  ApplicationContext applicationContext = new ClassPathXmlApplicationContext("com/oscar999/trans/sprhib/applicationContext.xml"); 
  ProductServiceImpl productService = applicationContext.getBean(ProductServiceImpl.class); 
  //productService.findProduct(1); 
  productService.saveProduct(); 
 } 
 
}

The description is as follows:

get can be done without transaction

If there is no insertion or update, the update will not be successful

Declarative mode configuration transaction

Needs to be set in xml configuration

Thing annotation method: @Transactional

When marked on the class In the previous example, all methods in the marked class perform transaction processing. The following code performs transaction processing in the service layer (it is a better way to configure transactions for the Service layer, because a Service layer method operation can be associated with multiple DAO operations. In Service The layer executes these Dao operations. If the multi-DAO operations fail, all are rolled back, and if they succeed, they are all submitted.)

@Service


 @Transactional


 public class UserServiceImpl implements UserService {


  @Autowired


  private UserDao userDao;


 
  public User getUserById(int id) {


   return userDao.findUserById(id);


  }


 }

When some methods in the class do not require things:

@Service


 @Transactional


 public class UserServiceImpl implements UserService {


  @Autowired


  private UserDao userDao;


 
  @Transactional(propagation = Propagation.NOT_SUPPORTED)


  public User getUserById(int id) {


   return userDao.findUserById(id);


  }

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