spring整合mybatis的一个转账业务
报错信息
整体结构
AccountMapper
```java
package com.fei.bank.mapper;
import com.fei.bank.pojo.Account;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface AccountMapper {
/**
* 新增账户
* @param account
* @return
*/
int insert(Account account);
/**
* 根据账号删除账户
* @param actno
* @return
*/
int deleteByActno(String actno);
/**
* 更新账户
* @param account
* @return
*/
int update(Account account);
/**
* 根据账号查询账户
* @param actno
* @return
*/
Account selectByActno(String actno);
/**
* 查询所有账户
* @return
*/
List<Account> selectAll();
}
Account
package com.fei.bank.pojo;
/**
* 账户类
*/
public class Account {
private String actno;
private Double balance;
@Override
public String toString() {
return "Account{" +
"actno='" + actno + '\'' +
", balance=" + balance +
'}';
}
public String getActno() {
return actno;
}
public void setActno(String actno) {
this.actno = actno;
}
public Double getBalance() {
return balance;
}
public void setBalance(Double balance) {
this.balance = balance;
}
public Account(String actno, Double balance) {
this.actno = actno;
this.balance = balance;
}
public Account() {
}
}
AccountService
package com.fei.bank.service;
import com.fei.bank.pojo.Account;
import org.springframework.stereotype.Service;
import java.util.List;
public interface AccountService {
/**
* 开户
* @param account
* @return
*/
int save(Account account);
/**
* 销户
* @param actno
* @return
*/
int deleteByActno(String actno);
/**
* 修改账户信息
* @param account
* @return
*/
int modify(Account account);
/**
* 查询账户
* @param actno
* @return
*/
Account getByActno(String actno);
/**
* 查询所有账户
* @return
*/
List<Account> getAll();
/**
* 转账
* @param fromActno
* @param toActno
* @param money
*/
void transfer(String fromActno,String toActno,double money);
}
AccountServiceImpl
package com.fei.bank.service.impl;
import com.fei.bank.mapper.AccountMapper;
import com.fei.bank.pojo.Account;
import com.fei.bank.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
import javax.annotation.Resources;
import java.util.List;
@Transactional
@Service("accountService")
public class AccountServiceImpl implements AccountService {
@Resource(name = "accountMapper")
private AccountMapper accountMapper;
@Override
public int save(Account account) {
return accountMapper.insert(account);
}
@Override
public int deleteByActno(String actno) {
return accountMapper.deleteByActno(actno);
}
@Override
public int modify(Account account) {
return accountMapper.update(account);
}
@Override
public Account getByActno(String actno) {
return accountMapper.selectByActno(actno);
}
@Override
public List<Account> getAll() {
return accountMapper.selectAll();
}
@Override
public void transfer(String fromActno, String toActno, double money) {
Account fromAct = accountMapper.selectByActno(fromActno);
if (fromAct.getBalance() < money){
throw new RuntimeException("余额不足");
}
Account toAct = accountMapper.selectByActno(toActno);
fromAct.setBalance(fromAct.getBalance() - money);
toAct.setBalance(toAct.getBalance() + money);
int count = accountMapper.update(fromAct);
count += accountMapper.update(toAct);
if (count != 2){
throw new RuntimeException("转账失败");
}
}
}
AccountMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.fei.bank.mapper.AccountMapper">
<insert id="insert">
insert into t_act values(#{actno},#{balance})
</insert>
<delete id="deleteByActno">
delete from t_act where actno = #{actno}
</delete>
<update id="update">
update t_act set actno = #{actno}, balance = #{balance}
</update>
<select id="selectByActno" resultType="Account">
select * from t_act where actno = #{actno}
</select>
<select id="selectAll" resultType="Account">
select * from t_act
</select>
</mapper>
jdbc.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db1
jdbc.username=root
jdbc.password=541366
spring.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan base-package="com.fei.bank"/>
<context:property-placeholder location="jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="mybatis-config.xml"/>
<property name="typeAliasesPackage" value="com.fei.bank.pojo"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.fei.bank.mapper"/>
</bean>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="txManager"/>
</beans>
TransferTest
package com.fei.bank.test;
import com.fei.bank.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TransferTest {
@Test
public void testTransfer(){
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
AccountService accountService = applicationContext.getBean("accountService", AccountService.class);
try {
accountService.transfer("act001","act002",10000);
System.out.println("转账成功");
}catch (Exception e){
e.printStackTrace();
}
}
}
