Spring扫描Mybatis的mapper接口的三种配置方式

短命女 2022-03-18 15:42 230阅读 0赞

*  mybatis支持与spring结合使用，使得mybatis中的mapper接口可以作为spring容器中的bean被应用代码中相关类，如Service类，通过@Autowired自动注入进来。在使用方面需要在项目中引入以下包：
    
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
 *  在spring中可以通过三种方式来自动扫描获取应用代码的mybatis相关的mapper接口定义：

1.  在applicationContext.xml中使用<mybatis:scan />
    
        <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
           
           ...
           
            
           <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
           		<property name="dataSource" ref="dataSource" />
           		<property name="mapperLocations" value="classpath:mybatis/mapper/**/*.xml" />
           		<property name="configLocation" value="classpath:mybatis/mybitas-config.xml" />
           </bean>
           
           <mybatis:scan base-package="org.xyz.jblog.dao"/>
           
           ...
           
        </beans>
2.  在applicationContext.xml中使用bean标签注册MapperScannerConfigurer，即
    
        <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
           
           ...
           
            
           <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
           		<property name="dataSource" ref="dataSource" />
           		<property name="mapperLocations" value="classpath:mybatis/mapper/**/*.xml" />
           		<property name="configLocation" value="classpath:mybatis/mybitas-config.xml" />
           </bean>
           
           <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
           		<property name="basePackage" value="org.xyz.jblog.dao" />
           </bean>
           
           ...
           
        </beans>
3.  如果应用是使用Java配置方式而不是XML，则在@Configuration配置类使用@MapperScan或者@MapperScans注解：
    
        @Configuration
        @MapperScan("org.xyz.jblog.dao")
        public class AppConfig { 
            @Bean
            public DataSource dataSource() { 
                return new PooledDataSource("com.mysql.jdbc.Driver", "jdbc:mysql://localhost:3306/test", "root", "root");
            }
            @Bean
            public SqlSessionFactory sqlSessionFactory() throws Exception { 
                SqlSessionFactoryBeansessionFactory = new SqlSessionFactoryBean();
                sessionFactory.setDataSource(dataSource());
                return sessionFactory.getObject();
            }
        }