spring4学习之配置式事务（七）

spring4配置式事务

1.引入jar包源码下载
2.配置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">

    <bean id="dataSource" 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事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

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

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

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


    <bean id="bankDao" class="com.newbeedaly.dao.impl.BankDaoImpl">
        <property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate"></property>
    </bean> 

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

</beans>

2.编写Dao和实现类

package com.newbeedaly.dao;

public interface BankDao {

    public void inMoney(int money,int userId);

    public void outMoney(int money,int userId);
}

package com.newbeedaly.dao.impl;

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

import com.newbeedaly.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) {
        // TODO Auto-generated method stub
        String sql="update t_count2 set count=count+:money where userId=:userId";
        MapSqlParameterSource sps=new MapSqlParameterSource();
        sps.addValue("money", money);
        sps.addValue("userId", userId);
        namedParameterJdbcTemplate.update(sql,sps);
    }

    @Override
    public void outMoney(int money, int userId) {
        // TODO Auto-generated method stub
        String sql="update t_count set count=count-:money where userId=:userId";
        MapSqlParameterSource sps=new MapSqlParameterSource();
        sps.addValue("money", money);
        sps.addValue("userId", userId);
        namedParameterJdbcTemplate.update(sql,sps);
    }

}

3.编写Service和实现类

package com.newbeedaly.service;

public interface BankService {

    /**
     * A向B转账count元
     * @param count
     * @param userIdA
     * @param userIdB
     */
    public void transferAccounts(int count,int userIdA,int userIdB);
}

package com.newbeedaly.service.impl;

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

import com.newbeedaly.dao.BankDao;
import com.newbeedaly.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 transferAccounts(final int count, final int userIdA, final int userIdB) {
        // TODO Auto-generated method stub
        transactionTemplate.execute(new TransactionCallbackWithoutResult() {

            @Override
            protected void doInTransactionWithoutResult(TransactionStatus arg0) {
                // TODO Auto-generated method stub
                bankDao.outMoney(count, userIdA);
                bankDao.inMoney(count, userIdB);                
            }
        });
    }

}

5.编写jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_bank
jdbc.username=root
jdbc.password=123456
``
6.编写测试类

package com.newbeedaly.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.newbeedaly.service.BankService;

public class T {

private ApplicationContext ac;

@Before
public void setUp() throws Exception {
    ac=new ClassPathXmlApplicationContext("beans.xml");
}

@Test
public void transferAccounts() {
    BankService bankService=(BankService)ac.getBean("bankService");
    bankService.transferAccounts(50, 1, 2);
}

}

“`

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