Spring-整合Mybatis的使用

方法一:

1、pom.xml中导入相关jar包

        junit

<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
</dependency>

        mybatis

<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.5.2</version>
</dependency>

         mysql-connector-java

<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.47</version>
</dependency>

        spring相关

<dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>5.1.10.RELEASE</version>
</dependency>
<dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-jdbc</artifactId>
   <version>5.1.10.RELEASE</version>
</dependency>

         aspectJ AOP 织入器

<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
   <groupId>org.aspectj</groupId>
   <artifactId>aspectjweaver</artifactId>
   <version>1.9.4</version>
</dependency>

        mybatis-spring整合包 【重点】

<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>2.0.2</version>
</dependency>

        配置Maven静态资源过滤问题！(有了这个，mapper.xml可以和mapper接口放在同一目录)

<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>true</filtering>
       </resource>
   </resources>
</build>

2、编写配置文件

主要编写两个配置文件:

        spring-dao 用来取代mybatis.xml把数据库的数据源连接信息和绑定mapper接口对应的配置文件等信息。

<?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: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/aop/spring-aop.xsd">

        <!--DataSource:使用Spring的数据源替换Mybatis的配置-->
    <bean id="datasouce" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
         <property name="url" value="jdbc:mysql://localhost:3306/eesy_mybatis"/>
         <property name="username" value="root"/>
         <property name="password" value="luolin123"/>
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasouce"></property>
        <!--绑定Mybatis-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!--绑定mapper映射文件  绑定mapper下所有的.xml文件 -->
        <property name="mapperLocations" value="classpath:com/rk/mapper/*.xml"></property>
    </bean>

    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入SqlSessionFactory  因为它没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>


</beans>

        spring-config.xml用来注册类的bean和注入等，将spring导入到spring-config.xml中。注册Dao的实体类，并注入sqlSession

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

    <bean id="userMapper" class="com.rk.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"></property>
    </bean>

</beans>

增加一个UserDao接口的实体类:

public class UserMapperImpl implements UserMapper{
    //我们所有的操作都是用SqlSession来执行，现在使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

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

    public List<User> SelectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.SelectUser();
        return users;
    }
}

3、测试

 @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper mapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = mapper.SelectUser();
        for (User user : users) {
            System.out.println(user);
        }
    }

方法二:

        区别就是 Dao接口的实体类 需要继承SqlSessionDaoSupport ,因为SqlSessionDaoSupport的getSqlSession()方法可以直接获取Sqlsession对象。就不需要在配置文件中注册sqlSession来获取Sqlsession对象了。

         修改后的UserDaoImpl

public class UserDaoImpl  extends SqlSessionDaoSupport implements UserDao{
    public List<User> selectUsers() {
        return getSqlSession().getMapper(UserDao.class).selectUsers();
    }
}

        修改在spring容器中注册userdao的自从装配的参数

    <bean id="userdao" class="com.rk.mapper.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory" />
    </bean>

         关于mybatis-spring 的更多类容，可以查看官方文档 gghttp://mybatis.org/spring/zh/入门案例