Spring整合Mybatis--xml配置文件方式

1.环境搭建

1.1.导入依赖

     <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
<!--        Spring需要的依赖-->
       <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-webmvc</artifactId>
           <version>5.2.5.RELEASE</version>
       </dependency>
<!--        Spring整合需要的依赖-->
       <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-jdbc</artifactId>
           <version>5.2.5.RELEASE</version>
       </dependency>
<!--        事物需要的依赖-->
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>
       <!--Mybatis需要的依赖-->
       <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
     <!--END-->

1.2 创建实体类

public class User {
    private int id;
    private String username;
    private String password;
}

1.3 配置文件

1.3.1 Spring-dao.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: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-4.1.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

</beans>

配置数据源

<!--   配置数据源   我这是使用Spring的数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/sqltest?useUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

获取SqlSessionFactory

<!--    获取sqlSessionFactory-->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <!-- 映射数据源 -->
      <property name="dataSource" ref="dataSource"/>
         <!-- 映射mybatis核心配置文件 -->
      <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
      <!-- 映射mapper文件 -->
      <property name="mapperLocations" value="classpath:mapper/*.xml"/>
  </bean>

获得SqlSession

 <!-- 获得sqlSession -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
            <!--只能用构造方法设置-->
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

配置声明式事物

   <!--   配送声明式事物-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <!--        映射数据源-->
        <property name="dataSource" ref="dataSource"/>
</bean>

配置事物通知

    <!--    结合aop实现是事物植入-->
    <!--    配置事物通知-->
    <tx:advice id="transaction" transaction-manager="transactionManager">
<!-- 给哪些方法配置事物-->
        <tx:attributes>
            <tx:method name="add*" propagation="REQUIRED"/>
            <tx:method name="query*" propagation="SUPPORTS"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

Spring中七种Propagation类的事务属性详解：

REQUIRED：支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择。

SUPPORTS：支持当前事务，如果当前没有事务，就以非事务方式执行。

MANDATORY：支持当前事务，如果当前没有事务，就抛出异常。

REQUIRES_NEW：新建事务，如果当前存在事务，把当前事务挂起。

NOT_SUPPORTED：以非事务方式执行操作，如果当前存在事务，就把当前事务挂起。

NEVER：以非事务方式执行，如果当前存在事务，则抛出异常。

NESTED：支持当前事务，如果当前事务存在，则执行一个嵌套事务，如果当前没有事务，就新建一个事务。

配置SpringAOP切面植入事物

<!--配置切面-->
    <aop:config>
        <aop:pointcut id="point" expression="execution(* com.lgw.dao.*.*(..))"/>
        <aop:advisor advice-ref="transaction" pointcut-ref="point"></aop:advisor>
    </aop:config>

1.3.2 mybatis-config.xml

建议把 settings 跟 typeAliases 存放在 mybatis-config.xml

<?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>
        <!--标准日志输出-->
        <!--<setting name="logImpl" value="STDOUT_LOGGING"/>-->
        <setting name="logImpl" value="LOG4J"/>
        <!--驼峰解决字段对应-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--懒加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
    </settings>
    <!--别名-->
    <typeAliases>
        <package name="com.lgw.pojo"/>
    </typeAliases>
</configuration>

2.编写代码

创建*Mapper接口

public interface UserMapper {
//    查询全部
    List<User>  queryUsers();
}

创建*Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lgw.dao.UserMapper">
<select id="queryUsers"  resultType="User">
    select id,username,password from user;
</select>
</mapper>

创建*MapperImpl类

方式一

public class UserMapperImpl implements UserMapper {
    private SqlSessionTemplate sqlsession;

    public void setSqlsession(SqlSessionTemplate sqlsession) {
        this.sqlsession = sqlsession;   
    }
    
        public List<User> queryUsers() {
        return sqlsession.getMapper(UserMapper.class).queryUsers();
    }

方式二 继承SqlSessionDaoSupport

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
      public List<User> queryUsers() {
        return sqlsession.getMapper(UserMapper.class).queryUsers();
    }
}

把*MapperImpl纳入Spring管理

把刚刚的Spring-dap.xml用Import导入过来

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

    <import resource="spring-dao.xml"/>

    <bean id="UserMapperImpl" class="com.lgw.dao.UserMapperImpl">
        <property name="sqlsession" ref="sqlSession"/>
    </bean>
    
    <bean id="UserMapperImpl2" class="com.lgw.dao.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

3.junit测试

    @Test
    public void SpringMybatisTest(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper bean = (UserMapper) context.getBean("UserMapperImpl");
        List<User> userList = bean.queryUsers();
        for (User user : userList) {
            System.out.println(user);
        }
    }