spring事務控制4

spring基於xml配置事務

  1. 創建maven工程添加需要的依賴
<dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>


    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>

    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.7</version>
    </dependency>

  1. 編寫持久層dao和實現類接口 和實體類
package org.example.domain;
//實體類
public class Account {

    private Integer id;
    private String name;
    private Float money;

    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 Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }

}

package org.example.dao;

import org.example.domain.Account;
import java.io.Serializable;

public class Account implements Serializable {
    /**
     * 根據Id查詢賬戶
     * @param accountId
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 根據名稱查詢賬戶
     * @param accountName
     * @return
     */
    Account findAccountByName(String accountName);

    /**
     * 更新賬戶
     * @param account
     */
    void updateAccount(Account account);

}

package org.example.dao.impl;

import org.example.dao.IAccountDao;
import org.example.domain.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.util.List;

public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao {

    public Account findAccountById(Integer accountId) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    public Account findAccountByName(String accountName) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("結果集不唯一");
        }
        return accounts.get(0);
    }

    public void updateAccount(Account account) {
        super.getJdbcTemplate().update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }
}

  1. 編寫業務層service和實現類接口
package org.example.service;

import org.example.domain.Account;

public interface IAccountService {
    /**
     * 根據id查詢賬戶信息
     * @param accountId
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 轉賬
     * @param sourceName    轉成賬戶名稱
     * @param targetName    轉入賬戶名稱
     * @param money         轉賬金額
     */
    void transfer(String sourceName,String targetName,Float money);
}

package org.example.service.impl;

import org.example.dao.IAccountDao;
import org.example.domain.Account;
import org.example.service.IAccountService;

public class AccountServiceImpl implements IAccountService {
    private IAccountDao accountDao;

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);
    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
        //2.1根據名稱查詢轉出賬戶
        Account source = accountDao.findAccountByName(sourceName);
        //2.2根據名稱查詢轉入賬戶
        Account target = accountDao.findAccountByName(targetName);
        //2.3轉出賬戶減錢
        source.setMoney(source.getMoney()-money);
        //2.4轉入賬戶加錢
        target.setMoney(target.getMoney()+money);
        //2.5更新轉出賬戶
        accountDao.updateAccount(source);

		//產生異常後測試是否會回滾事務
        int i=1/0;

        //2.6更新轉入賬戶
        accountDao.updateAccount(target);
    }

}

  1. 在bean.xml中導入約束配置持久層和業務層 配置spring事務
<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.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">

    <!-- 配置業務層-->
    <bean id="accountService" class="org.example.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"></property>
    </bean>

    <!-- 配置賬戶的持久層-->
    <bean id="accountDao" class="org.example.dao.impl.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置數據源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/student"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!-- spring中基於XML的聲明式事務控制配置步驟
       1、配置事務管理器
       2、配置事務的通知
               此時我們需要導入事務的約束 tx名稱空間和約束,同時也需要aop的
               使用tx:advice標籤配置事務通知
                   屬性:
                       id:給事務通知起一個唯一標識
                       transaction-manager:給事務通知提供一個事務管理器引用
       3、配置AOP中的通用切入點表達式
       4、建立事務通知和切入點表達式的對應關係
       5、配置事務的屬性
              是在事務的通知tx:advice標籤的內部

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


    <!-- 配置事務的通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!-- 配置事務的屬性
                isolation:用於指定事務的隔離級別。默認值是DEFAULT,表示使用數據庫的默認隔離級別。
                propagation:用於指定事務的傳播行爲。默認值是REQUIRED,表示一定會有事務,增刪改的選擇。查詢方法可以選擇SUPPORTS。
                read-only:用於指定事務是否只讀。只有查詢方法才能設置爲true。默認值是false,表示讀寫。
                timeout:用於指定事務的超時時間,默認值是-1,表示永不超時。如果指定了數值,以秒爲單位。
                rollback-for:用於指定一個異常,當產生該異常時,事務回滾,產生其他異常時,事務不回滾。沒有默認值。表示任何異常都回滾。
                no-rollback-for:用於指定一個異常,當產生該異常時,事務不回滾,產生其他異常時事務回滾。沒有默認值。表示任何異常都回滾。
        -->
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"></tx:method>
        </tx:attributes>
    </tx:advice>

    <!-- 配置aop-->
    <aop:config>
        <!-- 配置切入點表達式-->
        <aop:pointcut id="pt1" expression="execution(* org.example.service.impl.*.*(..))"></aop:pointcut>
        <!--建立切入點表達式和事務通知的對應關係 -->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"></aop:advisor>
    </aop:config>
</beans>
  1. 測試
package org.example;

import static org.junit.Assert.assertTrue;

import org.example.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:bean.xml")
public class AppTest 
{
    @Autowired
    private IAccountService accountService;

    @Test
    public  void testTransfer(){
        accountService.transfer("aaa","bbb",100f);

    }
}

在這裏插入圖片描述
產生異常數據庫值沒有變

spring基於註解配置事務

  1. 持久層代碼使用註解
package org.example.dao.impl;

import org.example.dao.IAccountDao;
import org.example.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;

import java.util.List;


@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    public Account findAccountById(Integer accountId) {
        List<Account> accounts = jdbcTemplate.query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    public Account findAccountByName(String accountName) {
        List<Account> accounts = jdbcTemplate.query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("結果集不唯一");
        }
        return accounts.get(0);
    }

    public void updateAccount(Account account) {
        jdbcTemplate.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }
}

  1. 業務層代碼使用@Transactional註解配置事務
package org.example.service.impl;

import org.example.dao.IAccountDao;
import org.example.domain.Account;
import org.example.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Service("accountService")
@Transactional(propagation= Propagation.SUPPORTS,readOnly=true)//只讀型事務的配置
public class AccountServiceImpl implements IAccountService {

    @Autowired
    private IAccountDao accountDao;


    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);
    }

    //需要的是讀寫型事務配置
    @Transactional(propagation= Propagation.REQUIRED,readOnly=false)
    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
        //2.1根據名稱查詢轉出賬戶
        Account source = accountDao.findAccountByName(sourceName);
        //2.2根據名稱查詢轉入賬戶
        Account target = accountDao.findAccountByName(targetName);
        //2.3轉出賬戶減錢
        source.setMoney(source.getMoney()-money);
        //2.4轉入賬戶加錢
        target.setMoney(target.getMoney()+money);
        //2.5更新轉出賬戶
        accountDao.updateAccount(source);

        int i=1/0;

        //2.6更新轉入賬戶
        accountDao.updateAccount(target);
    }

}

  1. 在配置文件中開啓對註解事務的支持
<?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:tx="http://www.springframework.org/schema/tx"
       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/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
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 配置spring創建容器時要掃描的包-->
    <context:component-scan base-package="org.example"></context:component-scan>
    <!-- 配置JdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置數據源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/student"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>


    <!-- spring中基於註解 的聲明式事務控制配置步驟
       1、配置事務管理器
       2、開啓spring對註解事務的支持
       3、在需要事務支持的地方使用@Transactional註解

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

    <!-- 開啓spring對註解事務的支持-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

</beans>
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