Spring框架---JDBC模板技术
目录
Spring框架的JDBC模板技术
JDBC模板技术概述
JDBC的模板类的使用
使用Spring框架来管理模板类
Spring框架管理开源的连接池
Spring框架的JDBC模板的简单操作
模拟转账开发
Dao编写的方式(第二种方式)
Spring框架的事务管理
Spring框架的事务管理相关的类和API
Spring框架声明式事务管理
Spring框架的JDBC模板技术
JDBC模板技术概述
Spring框架中提供了很多持久层的模板类来简化编程,使用模板类编写程序会变的简单
- template 模板
- 都是Spring框架提供XxxTemplate
提供了JDBC模板,Spring框架提供的
- JdbcTemplate类,Connection 表示连接,管理事务 Statement ResultSet
如果不使用JdbcTemplate,想要实现增删改查需要以下步骤
- 加载驱动
- 通过Conection接口获取连接
- 编写sql语句
- 获取执行sql对象,Statment或者PreparedStatment(更推荐,是一种预编译SQL语句的方法,可以防止SQL注入问题,使用?作为占位符)
- 执行sql语句,返回查询结果,将结果封装在Result结果集中
- 释放资源
JDBC的模板类的使用
引入JdbcTemplate,JdbcTemplate接口会帮我们完成获取连接,执行sql语句并封装结果,释放资源
创建maven项目,引入坐标依赖
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- AOP联盟 -->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<!-- Spring Aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- aspectj -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!--JDBC模板-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- 用于事务管理 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
</dependencies>
创建spring_db数据库
create database spring_db;
use spring_db;
create table account(
id int primary key auto_increment,
name varchar(40),
money double
)character set utf8 collate utf8_general_ci;
insert into account(name,money) values('aaa',1000);
insert into account(name,money) values('bbb',1000);
insert into account(name,money) values('ccc',1000);
数据库实体类
package com.qcby.demo4;
public class Account {
private Integer id;
private String name;
private Double money;
public Account() {
}
public Account(Integer id, String name, Double money) {
this.id = id;
this.name = name;
this.money = 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 Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
测试类
package com.qcby.demo0401Test;
import org.junit.Test;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.jdbc.core.JdbcTemplate;
public class demo1 {
/**
* 使用new对象方式完成
*/
@Test
public void run1(){
//创建连接池对象,spring框架内置了连接池对象
DriverManagerDataSource dataSource = new DriverManagerDataSource();
//设置了4个参数
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/spring_db");
dataSource.setUsername("root");
dataSource.setPassword("2020");
//提供模板,创建对象
JdbcTemplate template = new JdbcTemplate(dataSource);
//完成数据的增删改查
template.update("insert into account values (null,?,?)","熊大",1000);
}
}
将连接池对象传入到JdbcTemplate中,直接调用JdbcTemplate中的方法即可完成操作
使用Spring框架来管理模板类
上面代码的JdbcTemplate是自己手动new出来的,我们可以把这些类交给Spring框架去管理。
在配置文件中使用Spring管理内置的连接池
<?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: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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- demo1_1 -->
<!--配置连接池,使用的是Spring框架内置的连接池-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>
<property name="username" value="root"/>
<property name="password" value="2020"/>
</bean>
<!--配置jdbc模板-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
编写测试方法
package com.qcby.demo0401Test;
import com.qcby.demo4.Account;
import com.qcby.demo4.BeanMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext_jdbc.xml")
public class demo1_1 {
@Autowired
private JdbcTemplate jdbcTemplate;
/**
* 测试的方法
*/
@Test
public void run1(){
jdbcTemplate.update("insert into account values (null,?,?)","ccc",5000);
}
}
Spring框架管理开源的连接池
配置开源的连接池,使用Druid开源的连接池,引入坐标如下
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
</dependencies>
创建属性文件jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_db
jdbc.username=root
jdbc.password=2020
完成核心配置
<?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: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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- demo1_1 -->
<!--配置连接池,使用的是Spring框架内置的连接池-->
<!--<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">-->
<!--<property name="driverClassName" value="com.mysql.jdbc.Driver"/>-->
<!--<property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>-->
<!--<property name="username" value="root"/>-->
<!--<property name="password" value="2020"/>-->
<!--</bean>-->
<!--使用开源连接池-->
<!--<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">-->
<!--<property name="driverClassName" value="com.mysql.jdbc.Driver"/>-->
<!--<property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>-->
<!--<property name="username" value="root"/>-->
<!--<property name="password" value="2020"/>-->
<!--</bean>-->
<!--加载属性文件-->
<!--<bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">-->
<!--<property name="location" value="classpath:jdbc.properties"/>-->
<!--</bean>-->
<!--第二种写法:使用提供标签的方式-->
<context:property-placeholder location="jdbc.properties"/>
<!--加载属性的文件-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
<!--配置jdbc模板-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
Spring框架的JDBC模板的简单操作
增删改查代码编写
package com.qcby.demo0401Test;
import com.qcby.demo4.Account;
import com.qcby.demo4.BeanMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext_jdbc.xml")
public class demo1_1 {
@Autowired
private JdbcTemplate jdbcTemplate;
/**
* 测试的方法
*/
@Test
public void run1(){
jdbcTemplate.update("insert into account values (null,?,?)","ccc",5000);
}
/**
* 修改
*/
@Test
public void run2(){
jdbcTemplate.update("update account set name = ?,money = ? where id = ?","小小怪下士",3000,7);
}
/**
* 删除
*/
@Test
public void run3(){
jdbcTemplate.update("delete from account where id = ?",8);
}
/**
* 通过id查询
*/
@Test
public void run4(){
Account account = jdbcTemplate.queryForObject("select * from account where id = ?", new BeanMapper(), 6);
System.out.println(account);
}
/**
* 查询所有的数据
*/
@Test
public void run5(){
List<Account> list = jdbcTemplate.query("select * from account",new BeanMapper());
for(Account account:list){
System.out.println(account);
}
}
}
模拟转账开发
引入依赖
<dependencies>
<!--spring的核心-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--日志-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<!--Junit测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!--数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
<!--Spring整合junit测试-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
<scope>test</scope>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!-- AOP联盟 -->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<!-- Spring Aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- aspectj -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
</dependencies>
service代码的编写
package com.qcby.service;
import com.qcby.model.Account;
public interface AccountService {
public void updateSaveAll(Account account1, Account account2);
}
package com.qcby.service.Impl;
import com.qcby.dao.AccountDao;
import com.qcby.model.Account;
import com.qcby.service.AccountService;
public class AccountServiceImpl implements AccountService{
private AccountDao accountDao;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
@Override
public void updateSaveAll(Account account1, Account account2) {
//try {
//TxUtils.startTransaction();
//保存账号1
accountDao.updateSaveAll(account1);
//显示除零错误
//int a=1/0;
//保存账户2
accountDao.updateSaveAll(account2);
//TxUtils.commit();
//}catch (Exception e){
//e.printStackTrace();
//TxUtils.rollback();
//}
}
}
dao代码的编写
package com.qcby.dao;
import com.qcby.model.Account;
public interface AccountDao {
public void updateSaveAll(Account account);
}
package com.qcby.dao.Impl;
import com.qcby.dao.AccountDao;
import com.qcby.model.Account;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class AccountDaoImpl implements AccountDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
//实现两个账户的转账
@Override
public void updateSaveAll(Account account) {
jdbcTemplate.update("update account set money = money + ? where name = ?",account.getMoney(),account.getName());
}
}
配置文件代码编写
<?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: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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="accountService" class="com.qcby.service.Impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"/>
</bean>
<bean id="accountDao" class="com.qcby.dao.Impl.AccountDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>
<!--配置Jdbc模板类-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--使用提供标签的方式-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
</beans>
测试代码编写
package com.qcby.Test;
import com.qcby.model.Account;
import com.qcby.service.AccountService;
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("classpath:applicationContext.xml")
public class Test01 {
@Autowired
private AccountService accountService;
@Test
public void TestPay(){
Account account1 = new Account(null,"aaa",-1000.00);
Account account2 = new Account(null,"bbb",1000.00);
accountService.updateSaveAll(account1,account2);
}
}
Dao编写的方式(第二种方式)
package com.qcby.dao.Impl;
import com.qcby.dao.AccountDao;
import com.qcby.model.Account;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class AccountDaoImpl2 extends JdbcDaoSupport implements AccountDao {
//实现两个账户的转账
@Override
public void updateSaveAll(Account account) {
this.getJdbcTemplate().update("update account set money = money + ? where name = ?",account.getMoney(),account.getName());
}
}
<?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: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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="accountService" class="com.qcby.service.Impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"/>
</bean>
<bean id="accountDao" class="com.qcby.dao.Impl.AccountDaoImpl2">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--<bean id="accountDao" class="com.qcby.dao.Impl.AccountDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>-->
<!--配置Jdbc模板类-->
<!--<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">-->
<!--<property name="dataSource" ref="dataSource"/>-->
<!--</bean>-->
<!-- 第二种写法:使用提供标签的方式-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--加载属性的文件-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
</beans>
package com.qcby.Test;
import com.qcby.model.Account;
import com.qcby.service.AccountService;
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("classpath:applicationContext_dao2.xml")
public class Test02 {
@Autowired
private AccountService accountService;
@Test
public void TestPay(){
Account account1 = new Account(null,"aaa",-1000.00);
Account account2 = new Account(null,"bbb",1000.00);
accountService.updateSaveAll(account1,account2);
}
}
其余地方没有改变
Spring框架的事务管理
Spring框架的事务管理相关的类和API
PlatformTransactionManager接口
平台事务管理器。该接口有具体的实现类,根据不同的持久层框架,需要选择不同的实现类!相当于JdbcUtil工具类,这个接口中提供了提交事务,回滚事务等方法。
接口方法如下:
DataSourceTransactionManager 使用的Spring的JDBC模板或者MyBatis框架时选择
HibernateTransactionManager 使用的是Hibernate的框架时选择
方法 | 说明 |
TransactionStatus getTransaction(TransactionDefinition definition) | 获取事务状态信息 |
void commit(TransactionStatus status) | 提交事务 |
void rollback(TransactionStatus status) | 回滚事务 |
TransactionDefinition接口,事务定义信息接口
方法 | 说明 |
int getPropagationBehavior() | 获得事务的隔离级别 |
int getIsolationLevel(); | 获得事务的传播行为 |
int getTimeout(); | 获得超过时间 |
boolean isReadOnly(); | 是否为只读 |
事务的传播行为
- REQUIRED(默认):如果当前存在事务,则加入该事务;如果当前没有事务,则创建一个新的事务。
- SUPPORTS:如果当前存在事务,则加入该事务;如果当前没有事务,则以非事务方式执行。
- MANDATORY:如果当前存在事务,则加入该事务;如果当前没有事务,则抛出异常。
- REQUIRES_NEW:总是创建一个新的事务,如果当前存在事务,则挂起当前事务。
- NOT_SUPPORTED:总是以非事务方式执行,如果当前存在事务,则挂起当前事务。
- NEVER:总是以非事务方式执行,如果当前存在事务,则抛出异常。
- NESTED:如果当前存在事务,则在嵌套事务内执行。如果当前没有事务,则表现同REQUIRED。
Spring框架声明式事务管理
配置文件方式
引入依赖
<dependencies>
<!--spring的核心-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--日志-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<!--Junit测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!--数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
<!--Spring整合junit测试-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
<scope>test</scope>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!-- AOP联盟 -->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<!-- Spring Aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- aspectj -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.3</version>
</dependency>
<!-- JdbcTemplate模板 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- 事务管理模块 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
</dependencies>
编写实体类
package com.qcby.model;
public class Account {
private Integer id;
private String name;
private Double money;
public Account() {
}
public Account(Integer id, String name, Double money) {
this.id = id;
this.name = name;
this.money = 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 Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
编写配置文件
对updateSaveAll进行增强,设置隔离级别为READ_COMMITTED读已提交
可以解决在转账过程中出错所造成的转账丢失问题
DEFAULT使用默认隔离级别
事务隔离级别
- READ_UNCOMMITTED(读未提交)
- READ_COMMITTED(读已提交)
- REPEATABLE_READ(可重复读)
- SERIALIZABLE(串行化)
<?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: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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--使用提供标签的方式-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
<!--配置平台事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--配置事务的通知(没有自己编写切面类,通知方法也不是自己编写,Spring框架提供的)-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 对updateSaveAll进行增强,设置隔离级别,传播行为,超时的时间 -->
<tx:method name="updateSaveAll" isolation="DEFAULT" propagation="REQUIRED"/>
<tx:method name="find*" read-only="true"/>
</tx:attributes>
</tx:advice>
<!--配置AOP的增强-->
<aop:config>
<!--SPringle框架提供系统通知,使用advisor标签-->
<aop:advisor advice-ref="txAdvice" pointcut="execution(public * com.qcby.service.Impl.AccountServiceImpl.updateSaveAll(..))"/>
</aop:config>
<!-- 配置Jdbc模板类-->
<!--<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>-->
<!--配置service-->
<bean id="accountService" class="com.qcby.service.Impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"/>
</bean>
<!--配置dao-->
<!--<bean id="accountDao" class="com.qcby.dao.Impl.AccountDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>-->
<bean id="accountDao" class="com.qcby.dao.Impl.AccountDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
- name:切点方法名称
- isolation:事务的隔离级别
- propogation:事务的传播行为
- timeout:超时时间
- read-only:是否只读
持久层
package com.qcby.dao;
import com.qcby.model.Account;
public interface AccountDao {
public void updateSaveAll(Account account);
}
package com.qcby.dao.Impl;
import com.qcby.dao.AccountDao;
import com.qcby.model.Account;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
/*public class AccountDaoImpl implements AccountDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
//实现两个账户的转账
@Override
public void updateSaveAll(Account account) {
jdbcTemplate.update("update account set money = money + ? where name = ?",account.getMoney(),account.getName());
}
}*/
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
//实现两个账户的转账
@Override
public void updateSaveAll(Account account) {
this.getJdbcTemplate().update("update account set money = money + ? where name = ?",account.getMoney(),account.getName());
}
}
业务层没有改动
配置文件+注解的方式
<?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: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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--开启注解的扫描-->
<context:component-scan base-package="com.qcby"/>
<!--使用提供标签的方式-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--加载属性的文件-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
<!--配置平台事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 配置Jdbc模板类-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--开启事务注解的支持-->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
service代码
package com.qcby.service.Impl;
import com.qcby.dao.AccountDao;
import com.qcby.model.Account;
import com.qcby.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Transactional;
@Service
@Transactional(isolation = Isolation.DEFAULT)
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountDao accountDao;
@Override
public void updateSaveAll(Account account1, Account account2) {
//保存账号1
accountDao.updateSaveAll(account1);
//显示除零错误
//int a=1/0;
//保存账户2
accountDao.updateSaveAll(account2);
}
}
纯注解的方式
package com.qcby.utils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.stereotype.Component;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.annotation.Resource;
import javax.sql.DataSource;
/**
* 配置类
* @author Administrator
*/
@Configuration
@ComponentScan("com.qcby")
@EnableTransactionManagement//开启事务注解
public class SpringConfig {
@Bean(name="dataSource")
public DataSource createDataSource() throws Exception {
// 创建连接池对象,Spring框架内置了连接池对象
DriverManagerDataSource dataSource = new DriverManagerDataSource();
// 设置4个参数
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/spring_db");
dataSource.setUsername("root");
dataSource.setPassword("2020");
return dataSource;
}
@Resource(name="dataSource") // 不仅可以作用在属性上,也可以作用方法上。
@Bean(name="jdbcTemplate") // 把JdbcTemplate保存到IOC容器中
public JdbcTemplate createJdbcTemplate(DataSource dataSource) {
JdbcTemplate template = new JdbcTemplate(dataSource);
return template;
}
@Resource(name="dataSource")
@Bean(name="transactionManager")
public PlatformTransactionManager createTransactionManager(DataSource dataSource){
DataSourceTransactionManager manager = new DataSourceTransactionManager(dataSource);
return manager;
}
}