整合 mybatis-spring

pow.xml

<dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.30</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
    </dependencies>

1.编写数据源配置
2.sqlSessionFactory
3.sqlSessionFactoryTemplate
4.需要给接口加实现类【可以充当service层】
5.将自己写的实现类注入到spring中
6.测试使用

spring-dao.xml
配置数据源、sqlSessionFactory、sqlSessionFactoryTemplate

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
        http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       https://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    <!--1.使用spring的数据源替换mybatis配置 c3p0 dbcp druid-->
    <bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>
    <!--2.sqlSessionFactory-->
    <bean id="sessionFactory"  class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="ds"></property>
        <property name="configLocation" value="mybatis-config.xml" />
        <property name="mapperLocations" value="com/wei/dao/*Mapper.xml"/>
    </bean>
    <!--3.SqlSessionTemplate 就是我们使用的sqlsession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sessionFactory" />
    </bean>
</beans>

applicationContext.xml
导入子配置文件，并注入实现类到spring

<?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: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/aop
       https://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <import resource="classpath:spring-dao.xml" />

    <bean id="userMapper" class="com.wei.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession" />
    </bean>
</beans>

添加实现类UserMapperImpl.class

public class UserMapperImpl implements UserMapper {
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession){
        this.sqlSession = sqlSession;
    }
    @Override
    public List<User> findAll() {
        return sqlSession.getMapper(UserMapper.class).findAll();
    }
}

spring声明式事务

事务四大特性ACID

原子性：事务要么都成功，要么都失败。
一致性：事务前后，保证业务的一致性。不会出现数据的损坏。
隔离性：并发操作应该隔离开，防止数据损坏。
持久化：事务一旦提交成功，无论出现什么错误，结果都不会被影响，被持久化写到存储器中。

事务的7种传播行为

事务传播行为（propagation behavior）指的就是当一个事务方法被另一个事务方法调用时，这个事务方法应该如何进行。

在这里插入图片描述

参考优秀文章：事务属性之7种传播行为 https://blog.csdn.net/soonfly/article/details/70305683

结合AOP实现事务的织入

保证一个业务的前后的一致性。不会因为错误而改变了只运行一半的数据。

配置在spring-dao下

<!--配置声明式事务 DataSourceTransactionManager-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="ds" />
    </bean>
    <!--结合AOP实现事务的织入-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--配置事务的传播特性-->
        <tx:attributes>
            <tx:method name="add" propagation="REQUIRED"/>
            <tx:method name="delete" propagation="REQUIRED"/>
            <tx:method name="update" propagation="REQUIRED"/>
            <tx:method name="query" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED" />
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.wei3.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>

Spring 知识点整理及补充

整合 mybatis-spring

spring声明式事务

事务四大特性ACID

事务的7种传播行为

结合AOP实现事务的织入

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