溫馨提示×
您好，登錄后才能下訂單哦！
點(diǎn)擊 登錄注冊(cè) 即表示同意《億速云用戶(hù)服務(wù)條款》
您好，登錄后才能下訂單哦！
本篇內(nèi)容介紹了“Spring怎么使用注解和配置文件配置事務(wù)”的有關(guān)知識(shí)，在實(shí)際案例的操作過(guò)程中，不少人都會(huì)遇到這樣的困境，接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧！希望大家仔細(xì)閱讀，能夠?qū)W有所成！
使用注解配置事務(wù)：
package com.atguigu.spring.tx;
public interface BookShopDao {
//根據(jù)書(shū)號(hào)獲取書(shū)的單價(jià)
public int findBookPriceByIsbn(String isbn);
//更新數(shù)的庫(kù)存. 使書(shū)號(hào)對(duì)應(yīng)的庫(kù)存 - 1
public void updateBookStock(String isbn);
//更新用戶(hù)的賬戶(hù)余額: 使 username 的 balance - price
public void updateUserAccount(String username, int price);
}package com.atguigu.spring.tx;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
@Repository("bookShopDao")
public class BookShopDaoImpl implements BookShopDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public int findBookPriceByIsbn(String isbn) {
String sql = "SELECT price FROM book WHERE isbn = ?";
return jdbcTemplate.queryForObject(sql, Integer.class, isbn);
}
@Override
public void updateBookStock(String isbn) {
//檢查書(shū)的庫(kù)存是否足夠, 若不夠, 則拋出異常
String sql2 = "SELECT stock FROM book_stock WHERE isbn = ?";
int stock = jdbcTemplate.queryForObject(sql2, Integer.class, isbn);
if(stock == 0){
throw new BookStockException("庫(kù)存不足!");
}
String sql = "UPDATE book_stock SET stock = stock -1 WHERE isbn = ?";
jdbcTemplate.update(sql, isbn);
}
@Override
public void updateUserAccount(String username, int price) {
//驗(yàn)證余額是否足夠, 若不足, 則拋出異常
String sql2 = "SELECT balance FROM account WHERE username = ?";
int balance = jdbcTemplate.queryForObject(sql2, Integer.class, username);
if(balance < price){
throw new UserAccountException("余額不足!");
}
String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
jdbcTemplate.update(sql, price, username);
}
}package com.atguigu.spring.tx;
public interface BookShopService {
public void purchase(String username, String isbn);
}事務(wù)配置的核心部分：
package com.atguigu.spring.tx;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Service("bookShopService")
public class BookShopServiceImpl implements BookShopService {
@Autowired
private BookShopDao bookShopDao;
//添加事務(wù)注解
//1.使用 propagation 指定事務(wù)的傳播行為, 即當(dāng)前的事務(wù)方法被另外一個(gè)事務(wù)方法調(diào)用時(shí)
//REQUIRED:為默認(rèn)取值, 被調(diào)用的事務(wù)一個(gè)執(zhí)行失敗整個(gè)大事務(wù)就回滾
//REQUIRES_NEW:調(diào)用的事務(wù)如果執(zhí)行成功就保存結(jié)果不會(huì)被回滾，其他事務(wù)執(zhí)行失敗不會(huì)影響到它
//2.使用 isolation 指定事務(wù)的隔離級(jí)別, 最常用的取值為 READ_COMMITTED
//3.默認(rèn)情況下 Spring 的聲明式事務(wù)對(duì)所有的運(yùn)行時(shí)異常進(jìn)行回滾. 也可以通過(guò)對(duì)應(yīng)的
//屬性進(jìn)行設(shè)置. 通常情況下取默認(rèn)值即可.
//4.使用 readOnly 指定事務(wù)是否為只讀. 表示這個(gè)事務(wù)只讀取數(shù)據(jù)但不更新數(shù)據(jù),
//這樣可以幫助數(shù)據(jù)庫(kù)引擎優(yōu)化事務(wù). 若方法只讀取數(shù)據(jù)庫(kù)值, 應(yīng)設(shè)置 readOnly=true
//5.使用 timeout 指定事務(wù)最多可以占用的時(shí)間,若超過(guò)時(shí)間則強(qiáng)制回滾
// @Transactional(propagation=Propagation.REQUIRES_NEW,
// isolation=Isolation.READ_COMMITTED,
// noRollbackFor={UserAccountException.class})
@Transactional(propagation=Propagation.REQUIRES_NEW,
isolation=Isolation.READ_COMMITTED,
readOnly=false,
timeout=3)
@Override
public void purchase(String username, String isbn) {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {}
//1. 獲取書(shū)的單價(jià)
int price = bookShopDao.findBookPriceByIsbn(isbn);
//2. 更新數(shù)的庫(kù)存
bookShopDao.updateBookStock(isbn);
//3. 更新用戶(hù)余額
bookShopDao.updateUserAccount(username, price);
}
}package com.atguigu.spring.tx;
import java.util.List;
public interface Cashier {
public void checkout(String username, List<String> isbns);
}package com.atguigu.spring.tx;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service("cashier")
public class CashierImpl implements Cashier {
@Autowired
private BookShopService bookShopService;
@Transactional
@Override
public void checkout(String username, List<String> isbns) {
for(String isbn: isbns){
bookShopService.purchase(username, isbn);
}
}
}package com.atguigu.spring.tx;
import static org.junit.Assert.*;
import java.util.Arrays;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringTransactionTest {
private ApplicationContext ctx = null;
private BookShopDao bookShopDao = null;
private BookShopService bookShopService = null;
private Cashier cashier = null;
{
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
bookShopDao = ctx.getBean(BookShopDao.class);
bookShopService = ctx.getBean(BookShopService.class);
cashier = ctx.getBean(Cashier.class);
}
@Test
public void testTransactionlPropagation(){
cashier.checkout("AA", Arrays.asList("1001", "1002"));
}
@Test
public void testBookShopService(){
bookShopService.purchase("AA", "1001");
}
@Test
public void testBookShopDaoUpdateUserAccount(){
bookShopDao.updateUserAccount("AA", 200);
}
@Test
public void testBookShopDaoUpdateBookStock(){
bookShopDao.updateBookStock("1001");
}
@Test
public void testBookShopDaoFindPriceByIsbn() {
System.out.println(bookShopDao.findBookPriceByIsbn("1001"));
}
}BookStockException、UserAccountException為自定義異常類(lèi)！
配置文件：
<?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"
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.atguigu.spring"></context:component-scan>
<!-- 導(dǎo)入資源文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置 C3P0 數(shù)據(jù)源 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
</bean>
<!-- 配置 Spirng 的 JdbcTemplate -->
<bean id="jdbcTemplate"
class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置 NamedParameterJdbcTemplate, 該對(duì)象可以使用具名參數(shù), 其沒(méi)有無(wú)參數(shù)的構(gòu)造器, 所以必須為其構(gòu)造器指定參數(shù) -->
<bean id="namedParameterJdbcTemplate"
class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg ref="dataSource"></constructor-arg>
</bean>
<!-- 配置事務(wù)管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 啟用事務(wù)注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>配置文件（使用配置文件配置事務(wù)，以上類(lèi)的注解需要全部刪除）：
<?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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.atguigu.spring"></context:component-scan>
<!-- 導(dǎo)入資源文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置 C3P0 數(shù)據(jù)源 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
</bean>
<!-- 配置 Spirng 的 JdbcTemplate -->
<bean id="jdbcTemplate"
class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置 bean -->
<bean id="bookShopDao" class="com.atguigu.spring.tx.xml.BookShopDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<bean id="bookShopService" class="com.atguigu.spring.tx.xml.service.impl.BookShopServiceImpl">
<property name="bookShopDao" ref="bookShopDao"></property>
</bean>
<bean id="cashier" class="com.atguigu.spring.tx.xml.service.impl.CashierImpl">
<property name="bookShopService" ref="bookShopService"></property>
</bean>
<!-- 1. 配置事務(wù)管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 2. 配置事務(wù)屬性 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 根據(jù)方法名指定事務(wù)的屬性 -->
<tx:method name="purchase" propagation="REQUIRES_NEW"/>
<tx:method name="get*" read-only="true"/>
<tx:method name="find*" read-only="true"/>
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<!-- 3. 配置事務(wù)切入點(diǎn), 以及把事務(wù)切入點(diǎn)和事務(wù)屬性關(guān)聯(lián)起來(lái) -->
<aop:config>
<aop:pointcut expression="execution(* com.atguigu.spring.tx.xml.service.*.*(..))"
id="txPointCut"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>
</beans>“Spring怎么使用注解和配置文件配置事務(wù)”的內(nèi)容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識(shí)可以關(guān)注億速云網(wǎng)站，小編將為大家輸出更多高質(zhì)量的實(shí)用文章！
免責(zé)聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱：is@yisu.com進(jìn)行舉報(bào)，并提供相關(guān)證據(jù)，一經(jīng)查實(shí)，將立刻刪除涉嫌侵權(quán)內(nèi)容。
億速云公眾號(hào)
手機(jī)網(wǎng)站二維碼