編程性事務

首先在配置文件中配置一個事務類型的bean

<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"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop 
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
		https://www.springframework.org/schema/context/spring-context.xsd">

		<context:component-scan base-package="jee.pk1"></context:component-scan>
    	<!-- 引入jdbc.properties -->
    	<context:property-placeholder location="jdbc.properties"/>
    	<!-- 配置dbcp數據庫 -->
    	<bean id="dataSource"
			class="org.apache.commons.dbcp2.BasicDataSource"
			destroy-method="close">
			<property name="driverClassName" value="${driverClassName}" />
			<property name="url" value="${url}" />
			<property name="username" value="${uName}" />
			<property name="password" value="${password}" />
			<property name="initialSize" value="3" />
		</bean>
		
		<!-- 事務管理器 -->
		<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
			<property name="dataSource" ref="dataSource"></property>
		</bean>
</beans>

訪問數據庫代碼

package jee.pk1;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

@Component("userDao")
public class UserDaoImpl implements UserDao{

	
	private JdbcTemplate template;
	
	@Autowired
	public void Init(DataSource dataSource) {
		template=new JdbcTemplate(dataSource);
	}
	@Override
	public boolean delete(int id) {
		int n=template.update("delete from users where UserId=?",id);
		
		return n==1;
	}

}

事務代碼

package jee.pk1;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

@Component("userService")
public class UserServiceImpl implements UserService {

	
	private UserDao userDao;
	
	@Autowired
   public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	
	
	//事務模板
	private TransactionTemplate txtemplate;
	//將配置文件中的事務類注入此方法中，然後將事務類賦值給txtemplate
	@Autowired
	public void init(PlatformTransactionManager txManager) {
		this.txtemplate=new TransactionTemplate(txManager);
	}
	
	
	@Override
	public void remove() {
		txtemplate.execute(new TransactionCallbackWithoutResult() {
			
			//調用此方法之前開啓事務
			@Override
			protected void doInTransactionWithoutResult(TransactionStatus status) {
				userDao.delete(3);
				if(1==1)
				{
					throw new RuntimeException("某個錯誤");
				}
				userDao.delete(2);
			}
		});
		
	}

}

主方法

package jee.pk1;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class APP {

	public static void main(String[] args) {
		ApplicationContext ac=new ClassPathXmlApplicationContext("beans_pk1.xml");
		UserService userService=ac.getBean("userService", UserService.class);
		userService.remove();
	}
}