1. 程式人生 > >Spring --16.Spring基於註解的宣告事務控制

Spring --16.Spring基於註解的宣告事務控制

1、建立子工程、引入依賴 (同上xml方式)

2、編寫相關類、(同上xml方式)

3、開啟Spring對註解的支援、配置事務管理、開啟Spring對註解的支援

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:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
        <!--開啟事務註解的支援 transaction-manager;寫事務管理器的id-->
        <tx:annotation-driven transaction-manager="transactionManager"/>

        <!--開啟Spring註解掃描-->
        <context:component-scan base-package="com.day04_tx_anno"></context:component-scan>
        <!--匯入jdbc-->
        <context:property-placeholder location="classpath:jdbc.properties"/>

            <!--採用註解一定要用JdbcTemplate.因為在dao中要注入JdbcTemplate-->
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driverClass}"></property>
            <property name="url" value="${jdbc.url}"></property>
            <property name="username" value="${jdbc.username}"></property>
            <property name="password" value="${jdbc.password}"></property>
         </bean>


        <!--配置事務管理器-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <!--注入資料來源-->
            <property name="dataSource" ref="dataSource"></property>
        </bean>

</beans>

4、在相關類上加註解

AccountDaoImpl.java

package com.day04_tx_anno.dao.Impl;

import com.day04_tx.dao.AccountDao;
import com.day04_tx.domain.Account;
import com.day04_tx.rowmapper.AccountRowMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;

/**
 *
 * @ Author     :ShaoWei Sun.
 * @ Date       :Created in 9:38 2018/11/15
 */
@Repository("accountDao")
public class AccountDaoImpl implements AccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 根據id查詢使用者物件
     * @param id
     * @return
     */
    @Override
    public Account findById(Long id) {
        Account account = jdbcTemplate.queryForObject("select * from account where id = ?", new AccountRowMapper(), id);
        return account;
    }

    /**
     * 更新使用者物件
     * @param account
     */
    @Override
    public void update(Account account) {
        jdbcTemplate.update("update account set name = ?, money = ? where id =? ",account.getName(),account.getMoney(),account.getId());
    }
}

AccountServiceImpl.java

package com.day04_tx_anno.service.Imlp;

import com.day04_tx.dao.AccountDao;
import com.day04_tx.domain.Account;
import com.day04_tx.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @ Author     :ShaoWei Sun.
 * @ Date       :Created in 9:53 2018/11/15
 */
@Service("accountService")
@Transactional//該類中所有的方法都加可讀寫的事務
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    @Override
    public void transfer(Long fromId, Long toId, Double money) {
        //查詢轉出賬戶
        Account fromAccount = accountDao.findById(fromId);
        //查詢轉入帳戶
        Account toAccount = accountDao.findById(toId);
        //轉出帳戶撿錢
        fromAccount.setMoney(fromAccount.getMoney()-money);
        //轉入帳戶加錢
        toAccount.setMoney(toAccount.getMoney()+money);
        //更新轉出賬戶
        accountDao.update(fromAccount);
         //int i = 1/0;
        //更新轉入賬戶
        accountDao.update(toAccount);
    }

    /**
     * 查詢功能、現在做了修改操作、但不允許的。
     * @param id 使用者id
     * @return
     */
    @Override
    public Account findById(Long id) {
        Account account = accountDao.findById(id);
        account.setMoney(100000d);
        accountDao.update(account);
        return account;
    }


}

5、在業務層中find開頭的方法加只讀事務@Transactional(readOnly=true)

AccountServiceImpl.java

package com.day04_tx_anno.service.Imlp;

import com.day04_tx.dao.AccountDao;
import com.day04_tx.domain.Account;
import com.day04_tx.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @ Author     :ShaoWei Sun.
 * @ Date       :Created in 9:53 2018/11/15
 */
@Service("accountService")
@Transactional//該類中所有的方法都加可讀寫的事務
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    @Override
    public void transfer(Long fromId, Long toId, Double money) {
        //查詢轉出賬戶
        Account fromAccount = accountDao.findById(fromId);
        //查詢轉入帳戶
        Account toAccount = accountDao.findById(toId);
        //轉出帳戶撿錢
        fromAccount.setMoney(fromAccount.getMoney()-money);
        //轉入帳戶加錢
        toAccount.setMoney(toAccount.getMoney()+money);
        //更新轉出賬戶
        accountDao.update(fromAccount);
         //int i = 1/0;
        //更新轉入賬戶
        accountDao.update(toAccount);
    }

    /**
     * 查詢功能、現在做了修改操作、但不允許的。
     * @param id 使用者id
     * @return
     */
    @Override
    @Transactional(readOnly = true)//只讀事務
    public Account findById(Long id) {
        Account account = accountDao.findById(id);
        account.setMoney(100000d);
        accountDao.update(account);
        return account;
    }


}

 

提示:@Transactional註解也可以加在方法上,如果類上和方法上都有@Transactional,則以方法上的為準。

測試註解事務是否成功

執行單元測試類TestTx中的test1方法,控制檯報“被零除”異常,account表中的資料也沒有發生變化,表示註解事務配置成功啦!

執行Test2方法、發現會出現

注:實際開發中。事務只用xml配置、註解牽涉到第三方類就不能用了。