第十讲：10.spring对事物的支持-编程式事务管理

转账业务
1，复制spring403-03 改名spring403：创建表结构，数据库的引擎一定是InnoDB

Create Table

CREATE TABLE `t_account` (   `id` int(11) NOT NULL,   `balance` float NOT NULL,   `user_name` varchar(50) DEFAULT NULL,   PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8

2，新建BankDao接口，新建BankDaoImpl实现类。写业务逻辑代码
BankDao接口：
package com.cruise.dao;

public interface BankDao {

    public void InMoney(int money ,int userid );
    public void OutMoney(int money ,int userid );
}
BankDaoImpl实现类：
package com.cruise.dao.impl;

import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

import com.cruise.dao.BankDao;

public class BankDaoImpl implements BankDao{

    private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
    
    public void setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
       this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
    }

    @Override
    public void InMoney(int money, int userid) {
       
       String sql ="update t_account set balance=balance+:money where id=:userid";
       MapSqlParameterSource msps= new MapSqlParameterSource();
       msps.addValue("money", money);
       msps.addValue("userid", userid);
       namedParameterJdbcTemplate.update(sql, msps);
    }

    @Override
    public void OutMoney(int money, int userid) {
       String sql ="update t_account set balance=balance-:money where id=:userid";
       MapSqlParameterSource msps= new MapSqlParameterSource();
       msps.addValue("money", money);
       msps.addValue("userid", userid);
       namedParameterJdbcTemplate.update(sql, msps);
    }
}
3，写BankService接口，写BankServiceImpl实现类，
BankService接口：
package com.cruise.service;

public interface BankService {

    public void transferAccount(int money ,int userA ,int userB);
}
BankServiceImpl实现类：
package com.cruise.service.impl;

import com.cruise.dao.BankDao;
import com.cruise.service.BankService;

public class BankServiceImpl implements BankService{

    private BankDao bankDao;
    
    public void setBankDao(BankDao bankDao) {
       this.bankDao = bankDao;
    }
    
    @Override
    public void transferAccount(int money, int userA, int userB) {
       bankDao.OutMoney(money, userA);
       bankDao.InMoney(money, userB);
    }
}
4，删除没有的包和类，修改jdbc.properties文件的数据库名
5，修改beans.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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context    
        http://www.springframework.org/schema/context/spring-context.xsd">

<context:property-placeholder location="jdbc.properties"/>

<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
bean>

<bean id="namedParameterJdbcTemplate1"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
        <constructor-arg ref="dataSource1">constructor-arg>
bean>

<bean id="bankDao1" class="com.cruise.dao.impl.BankDaoImpl">
    <property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate1">property>
bean>

<bean id="bankService" class="com.cruise.service.impl.BankServiceImpl">
    <property name="bankDao" ref="bankDao1">property>
bean>

beans>
6，写测试-运行
package com.cruise.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.cruise.service.BankService;

public class T {
    
    public static void main(String[] args) {
       ClassPathXmlApplicationContext CPXAC=new ClassPathXmlApplicationContext("beans.xml");
       BankService  bankService = (BankService) CPXAC.getBean("bankService");
       bankService.transferAccount(200, 1, 2);
    }
}
7，在BankDaoImpl中设置异常代码
8，添加事物，在BankServiceImpl添加成员变量TransactionTemplate,set()方法，修改业务代码
package com.cruise.service.impl;

import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

import com.cruise.dao.BankDao;
import com.cruise.service.BankService;

public class BankServiceImpl implements BankService{

    private BankDao bankDao;
    private TransactionTemplate transactionTemplate;
    
    public void setBankDao(BankDao bankDao) {
       this.bankDao = bankDao;
    }
    
    public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
       this.transactionTemplate = transactionTemplate;
    }

    @Override
    public void transferAccount(int money, int userA, int userB) {
       
       transactionTemplate.execute(new TransactionCallbackWithoutResult() {
           
           @Override
           protected void doInTransactionWithoutResult(TransactionStatus arg0) {
              bankDao.OutMoney(money, userA);
              bankDao.InMoney(money, userB);
              
           }
       });
    }
}
9，在beans.xml中定义jdbc事物管理器的bean，需要把数据源注入进去；定义transactionTemplate的bean，需要注入事务管理器的bean；再把transactionTemplate的bean注入到BankService中。
<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context    
        http://www.springframework.org/schema/context/spring-context.xsd">

<context:property-placeholder location="jdbc.properties"/>

<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
</bean>

<!--jdbc事物管理器-->
<bean id="transactionManager1"class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource1"></property>
</bean>

<bean id="transactionTemplate1"class="org.springframework.transaction.support.TransactionTemplate">
    <property name="transactionManager" ref="transactionManager1"></property>
</bean>

<bean id="namedParameterJdbcTemplate1"class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
        <constructor-arg ref="dataSource1"></constructor-arg>
</bean>

<bean id="bankDao1" class="com.cruise.dao.impl.BankDaoImpl">
    <property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate1"></property>
</bean>

<bean id="bankService" class="com.cruise.service.impl.BankServiceImpl">
    <property name="bankDao" ref="bankDao1"></property>
    <property name="transactionTemplate" ref="transactionTemplate1"></property>
</bean>

</beans>

10，测试-运行
package com.cruise.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.cruise.service.BankService;

public class T {
   
    public static void main(String[] args) {
       ClassPathXmlApplicationContext CPXAC=new ClassPathXmlApplicationContext("beans.xml");
       BankService  bankService = (BankService) CPXAC.getBean("bankService");
       bankService.transferAccount(200, 1, 2);
    }
}