[spring]spring和mybatis的整合与事务处理

12.spring和mybatis整合

1.导包

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.29</version>
    </dependency>

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.19</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.18</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.7</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
</dependencies>

2.将mybatis中的配置到spring中

mybatis被spring接管后，他自己的配置文件只需要写别名和日志，事务和数据库连接交给spring

<?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>

    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <typeAliases>
        <package name="com.pang.pojo"/>
    </typeAliases>
</configuration>

<?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
        https://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/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--整合mybatis的数据库 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/jdbc?useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="username" value="root"/>
        <property name="password" value="123123"/>
    </bean>
    
    <!--整合mybatis的SQLSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件 -->
        <property name="configLocation" value="classpath:mybatis_config.xml"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
    
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能用构造器注入 没有set方法 -->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    
    <bean id="user" class="mapper.UserMapperImpl">
        <property name="session" ref="sqlSession"/>
    </bean>
</beans>

3.接口实现类

package mapper;

import org.mybatis.spring.SqlSessionTemplate;
import pojo.User;

import java.util.List;

/**
 * @author panglili
 * @create 2022-07-24-18:42
 */
public class UserMapperImpl implements UserMapper {
    private SqlSessionTemplate sqlSession;

    public void setSession(SqlSessionTemplate session) {
        this.sqlSession = session;
    }

    public List<User> user() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        return mapper.user();
    }
}

测试

import mapper.UserMapper;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import pojo.User;
import java.util.List;

/**
 * @author panglili
 * @create 2022-07-24-18:01
 */
public class MyTest {
  @Test
    public void Test(){

       ApplicationContext context = new ClassPathXmlApplicationContext("application.xml");
        UserMapper user1 = context.getBean("user", UserMapper.class);
        List<User> list = user1.user();
        for(User u :list){
            System.out.println(u);
        }

    }
}

13.事务支持

只需要在spring中简单的配置两点就可以实现

<tx:advice id="txAdvice">
        <tx:attributes>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>

注意代理的是接口不是类！！！

 <aop:config>

        <aop:pointcut id="serviceOperation"
                expression="execution(* service..*Service.*(..))"/>

        <aop:advisor pointcut-ref="serviceOperation" advice-ref="txAdvice"/>

    </aop:config>