目录
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一:Spring6集成MyBatis3.5
第一步:准备数据库表
- 使用t_act表(账户表)
第二步:IDEA中创建一个模块,并引入依赖
- spring-context
- spring-jdbc
- mysql驱动
- mybatis
- mybatis-spring:mybatis提供的与spring框架集成的依赖
- 德鲁伊连接池
- junit
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.bjpowernode</groupId>
<artifactId>spring6-015-sm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<!--仓库-->
<repositories>
<!--spring里程碑版本的仓库-->
<repository>
<id>repository.spring.milestone</id>
<name>Spring Milestone Repository</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<dependencies>
<!--spring context依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>6.0.0-M2</version>
</dependency>
<!--spring-jdbc依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>6.0.0-M2</version>
</dependency>
<!--mysql驱动依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.30</version>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.10</version>
</dependency>
<!--mybatis提供的与spring框架集成的依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!--druid连接池依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.13</version>
</dependency>
<!--junit依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
</properties>
</project>
第三步:基于三层架构实现,所以提前创建好所有的包
- com.powernode.bank.mapper
- com.powernode.bank.service
- com.powernode.bank.service.impl
- com.powernode.bank.pojo
第四步:编写pojo
- Account,属性私有化,提供公开的setter getter和toString。
package com.powernode.bank.pojo;
public class Account {
private String actno;
private Double balance;
public Account() {
}
public Account(String actno, Double balance) {
this.actno = actno;
this.balance = 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;
}
}
第五步:编写mapper接口
AccountMapper接口,定义方法
package com.powernode.bank.mapper;
import com.powernode.bank.pojo.Account;
import java.util.List;
// 连接接口的实现类不需要写,采用Mybatis动态代理机制生成实现类
public interface AccountMapper {
// 增
int insert(Account account);
// 删
int deleteByActno(String actno);
// 改
int update(Account account);
// 查一个
Account selectByActno(String actno);
// 查所有
List<Account> selectAll();
}
第六步:编写mapper配置文件
在配置文件中配置命名空间,以及每一个方法对应的sql。
注意1:按照下图提示创建这个目录,注意是斜杠不是点儿;在resources目录下新建,并且要和Mapper接口包对应上。
注意2:如果接口叫做AccountMapper,配置文件必须是AccountMapper.xml;并且命名空间namespace的名字必须是接口AccountMapper的全限定名字
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.powernode.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 balance = #{balance} where actno = #{actno}
</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>
第七步:编写service接口和service接口实现类
AccountService接口类
package com.powernode.bank.service;
import com.powernode.bank.pojo.Account;
import java.util.List;
public interface AccountService {
// 开户
int save(Account act);
// 根据账号销户
int deleteByActno(String actno);
// 修改账户
int update(Account act);
// 根据账号获取账户
Account getByActno(String actno);
// 获取所有账户
List<Account> getAll();
// 转账
void transfer(String fromActno, String toActno, double money);
}
AccountServiceImpl实现类,注入AccountMapper、并纳入Spring容器管理
package com.powernode.bank.service.impl;
import com.powernode.bank.mapper.AccountMapper;
import com.powernode.bank.pojo.Account;
import com.powernode.bank.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Transactional // 添加事务管理
@Service("accountService") // 纳入Spring容器管理
public class AccountServiceImpl implements AccountService {
@Autowired// 注入AccountMapper
private AccountMapper accountMapper;
@Override
public int save(Account act) {
return accountMapper.insert(act);
}
@Override
public int deleteByActno(String actno) {
return accountMapper.deleteByActno(actno);
}
@Override
public int update(Account act) {
return accountMapper.update(act);
}
@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) {
// 先查询第一个账户的余额
Account fromAccount = accountMapper.selectByActno(fromActno);
if (fromAccount.getBalance() < money){
throw new RuntimeException("余额不足!");
}
// 余额充足
Account toAccount = accountMapper.selectByActno(toActno);
// 修改内存中的余额
fromAccount.setBalance(fromAccount.getBalance()-money);
toAccount.setBalance(toAccount.getBalance()+money);
// 修改数据库中的数据
int count = accountMapper.update(fromAccount);
count += accountMapper.update(toAccount);
// 判断转账是否成功
if (count != 2) {
throw new RuntimeException("转账失败!");
}
}
}
第八步:编写jdbc.properties配置文件
数据库连接池相关信息
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=123
第九步:编写mybatis-config.xml配置文件
该文件可以没有,大部分的配置可以转移到spring配置文件中!
如果遇到mybatis相关的系统级配置,还是需要这个文件,这里就只配置日志信息!
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--打印mybatis的日志信息、sql语句等信息-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
</configuration>
第十步:编写spring.xml配置文件
- 组件扫描
- 引入外部的属性文件
- 数据源
- SqlSessionFactoryBean配置
- 注入mybatis核心配置文件路径
- 注入数据源
- 指定别名包
- Mapper扫描配置器
- 指定扫描的包
- 事务管理器DataSourceTransactionManager
- 注入数据源
- 启用事务注解
- 注入事务管理器
注意:当你在spring.xml文件中直接写标签内容时,IDEA会自动给你添加命名空间
<?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">
<!--组件扫描-->
<context:component-scan base-package="com.powernode.bank"/>
<!--引入外部的属性配置文件-->
<context:property-placeholder location="jdbc.properties"/>
<!--数据源-->
<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>
<!--配置SqlSessionFactoryBean-->
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<!--注入数据源-->
<property name="dataSource" ref="dataSource"/>
<!--指定mybatis核心配置文件-->
<property name="configLocation" value="mybatis-config.xml"/>
<!--指定别名-->
<property name="typeAliasesPackage" value="com.powernode.bank.pojo"/>
</bean>
<!--Mapper扫描配置器,主要扫描Mapper接口,生成代理类-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.powernode.bank.mapper"/>
</bean>
<!--事务管理器-->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--启用事务注解-->
<tx:annotation-driven transaction-manager="txManager"/>
</beans>
第十一步:编写测试程序,并添加事务,进行测试
package com.powernode.bank.test;
import com.powernode.bank.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SMTest {
@Test
public void testSM(){
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
AccountService accountService = applicationContext.getBean("accountService", AccountService.class);
try {
accountService.transfer("act-001","act-002",1000);
System.out.println("转账成功");
}catch (Exception e){
e.printStackTrace();
}
}
}
补充: Spring配置文件的import
spring配置文件有多个,并且可以在spring的核心配置文件中使用import进行引入,我们可以将组件扫描单独定义到一个配置文件中,如下:
common.xml:单独写一个配置文件,里面定义组件扫描的信息
<?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"
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">
<!--组件扫描-->
<context:component-scan base-package="com.powernode.bank"/>
</beans>
在核心配置文件spring.xm中引入:
<?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">
<!--引入其他的spring配置文件-->
<import resource="common.xml"/>
</beans>
注意:在实际开发中,service单独配置到一个文件中,dao单独配置到一个文件中,然后在核心配置文件中引入,养成好习惯!